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WO2013007864A1 - Procédé et dispositif de mesure destinés à mesurer l'épaisseur d'une bande fibreuse mobile - Google Patents

Procédé et dispositif de mesure destinés à mesurer l'épaisseur d'une bande fibreuse mobile Download PDF

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Publication number
WO2013007864A1
WO2013007864A1 PCT/FI2011/050645 FI2011050645W WO2013007864A1 WO 2013007864 A1 WO2013007864 A1 WO 2013007864A1 FI 2011050645 W FI2011050645 W FI 2011050645W WO 2013007864 A1 WO2013007864 A1 WO 2013007864A1
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WO
WIPO (PCT)
Prior art keywords
optical measuring
measuring sensor
fibre web
distance
optical
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/FI2011/050645
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English (en)
Inventor
Markku MÄNTYLÄ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Valmet Automation Oy
Original Assignee
Metso Automation Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Metso Automation Oy filed Critical Metso Automation Oy
Priority to PCT/FI2011/050645 priority Critical patent/WO2013007864A1/fr
Publication of WO2013007864A1 publication Critical patent/WO2013007864A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
    • G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
    • G01B7/06—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness for measuring thickness
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B11/00—Measuring arrangements characterised by the use of optical techniques
    • G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
    • G01B11/06—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material
    • G01B11/0691—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness for measuring thickness ; e.g. of sheet material of objects while moving

Definitions

  • the invention relates to a method for measuring a caliper of a moving fibre web, the method comprising measuring a distance between at least one optical measuring sensor and at least one surface of the moving fibre web by means of an optical measuring signal provided by the optical measuring sensor.
  • the invention relates to a measuring device for measuring a caliper of a moving fibre web, the measuring device comprising at least one optical measuring sensor for measuring a distance between the optical measuring sensor and the moving fibre web by means of an optical measuring signal provided by the optical measuring sensor.
  • a caliper (a thickness) of a moving fibre web, such as a paper web
  • a contacting measuring device comprising contacting measuring members touching the surface of the moving web on both sides of the web.
  • the caliper of the moving fibre web is then obtained by measuring the distance between the contacting measuring members by means of electromagnetic sensors, for example.
  • a problem relating to the contacting measuring device is that the measuring members may come loose from the surface of the moving web due to a flow of air caused by or flowing with the moving web, resulting to erroneous measurement result, unless the contacting measuring members are pressed against the surfaces of the web with a great force, which, in turn, may damage the surface of the moving fibre web.
  • the caliper of a moving fibre web is nowadays typically measured using semi-contacting or non-contacting measuring devices having at least one optical measuring sensor.
  • a semi-contacting measuring device When a semi-contacting measuring device is used, one surface of the moving web is supported to a reference element for the duration of the measurement.
  • the distance between the optical measuring sensor and the surface of the web may be measured by means of an optical measuring signal provided by the optical measuring sensor.
  • the distance between the optical measuring sensor and the reference element may, in turn, be measured by means of an electromagnetic measuring sensor, whereby the caliper of the web may be obtained by subtracting the distance between the optical measuring sensor and the moving fibre web from the distance between the optical measuring sensor and the reference element.
  • the web is not separately supported for the duration of the measurement.
  • the caliper of the web is then obtained by measuring the distances of optical measuring sensors arranged on both sides of the web from the surfaces of the web and by subtracting these distances from the distance between the optical measuring sensors measured with a third measuring sensor, which typically is an electromagnetic measuring sensor.
  • the measuring accuracy of the caliper measurement of the paper web there are very high requirements for the measuring accuracy of the caliper measurement of the paper web.
  • the caliper of a web manufactured with a newsprint machine is typically about 70 micrometres and the external measuring accuracy aimed at may be less than micrometre.
  • the measuring accuracy of the present optical measuring sensors may be even two or three micrometres, depending on the quality of the fibre web to be manufactured and the extent to which the properties of the fibre web vary during manufacturing, for example.
  • a method according to the invention is characterized by the wavelength of the optical measuring signal being less than or equal to 500 nm.
  • a measuring device is characterized in that the wavelength of the optical measuring signal is less than or equal to 500 nm.
  • a method for measuring a caliper of a moving fibre web comprises measuring a distance between at least one optical measuring sensor and at least one surface of the moving fibre web by means of an optical measuring signal provided by the optical measuring sensor, wherein the wavelength of the optical measuring signal is less than or equal to 500 nm.
  • the wavelength of the optical measuring signal is substantially shorter or smaller than the wavelength of the measuring signal in the presently available optical measuring sensors, wherein the wavelength of the optical measuring signal may be as long as 740 - 750 nm.
  • the wavelength of the optical measuring signal is shorter than previously, the penetration of the measuring signal through the surface of the porous fibre web inside the fibre web is smaller than previously.
  • the fibre web may be for example a paper web, board web, tissue web, pulp web or any other similar fibre web.
  • the penetration of the optical measuring signal through the surface of the fibre web is smaller than previously, the measured distance between the optical measuring sensor and the fibre web is more accurate than previously. Also backscattering of the optical measuring signal from the surface of the fibre web is stronger than previously, providing a more reliable measurement process or event.
  • Figure 1 is a schematic cross-sectional side view of a measuring device where the solution may be utilized
  • Figure 2 is a schematic cross-sectional side view of a second measuring device where the solution may be utilized.
  • Figure 3 is a schematic cross-sectional side view of a third measuring device where the solution may be utilized.
  • Figure 1 shows a schematic cross-sectional side view of a measuring device 1 for measuring a caliper of a fibre web 2 moving in the direction of arrow A.
  • the fibre web may be for example a paper web, board web, tissue web, pulp web or any other similar fibre web and, for the sake of clarity, the fibre web 2 in Figure 1 is substantially thicker in proportion to the measuring device 1 than in reality.
  • the measuring device 1 has a first measuring head 3 arranged on the side of the first surface 2' of the fibre web 2 and a second measuring head 4 arranged on the side of the second surface 2" of the fibre web 2 so that between the measuring heads 3, 4 there is an air gap 5, where the fibre web 2 moves at a high speed.
  • the first measuring head 3 may be arranged into a first measuring carriage 6 and the second measuring head 4 into a second measuring carriage 7.
  • the first measuring carriage 6 is arranged to move along an upper rail 8 of a measuring frame and the second measuring carriage 7 along a lower rail 9 of the measuring frame.
  • the measuring carriages 6 and 7 are arranged to move back and forth in the measuring frame in a manner known per se to a skilled person, i.e. so that they traverse the entire width of the fibre web 2 to be manufactured, whereby the measuring device 1 measures the caliper of the fibre web 2 substantially continuously.
  • the direction of movement of the measuring carriages 6 and 7 is perpendicular to the surface of the drawing page.
  • the first measuring head 3 and the second measuring head 4 may also be fixedly arranged to the paper machine or similar equipment, in which case the caliper of the fibre web 2 is measured only at one point in the width direction of the fibre web 2.
  • the measuring device 1 in Figure 1 is a semi-contacting measuring device, where the moving fibre 2 is supported to the reference surface 10' of the reference element 10 during the caliper measurement of the fibre web 2.
  • the reference element 10 is arranged in the second measuring head 4 so that the second surface 2" of the fibre web 2 is supported to the reference surface 10'.
  • the reference element 10 is provided with holes 1 1 extending through the reference element 10 so that a vacuum arranged below the reference element 10 may act through the holes 1 1 on the fibre web 2 and so that the vacuum draws or sucks the second surface 2" of the fibre web 2 gently to the reference surface 10' of the reference element 10 as shown in Figure 1 .
  • the actual means for providing the vacuum have not been disclosed in Figure 1 because they are known to a skilled person. Instead of vacuum, other means for supporting the fibre web 2 to the reference element 10 may be used.
  • the measuring device 1 For measuring the caliper of the moving fibre web 2, the measuring device 1 comprises an optical measuring sensor 12 and electromagnetic measuring sensors 16.
  • the optical measuring sensor 12 may be for example a laser comprising a transmitter part 13 for transmitting the optical measuring signal 14 or a measuring beam towards the fibre web 2 and a receiver part 15 for receiving the part of the optical measuring signal 14 reflected from the first surface 2' of the fibre web 2.
  • the optical measuring sensor 12 is arranged to measure or determine a distance D1 between the optical measuring sensor 12 and the moving fibre web 2, i.e. the first surface 2' of the moving fibre web 2.
  • the optical measuring sensor 12 may be a laser, for example a laser triangulation sensor, or some another optical measuring device, for example an optical measuring device utilizing a confocal chromatic aberration method.
  • the electromagnetic measuring sensors 16 are arranged to measure or determine a distance D2 between the optical measuring sensor 12 and the reference surface 10' of the reference element 10.
  • Electromagnetic measuring sensors 16 may be for example coils, which are shown in a very schematic manner in Figure 1 .
  • the reference element 10, in turn, is made of a material that conducts electricity well, such as steel, aluminium, copper or the like, whereby the distance between the electromagnetic measuring sensors 16 and the reference part 10 may be determined in an inductive manner known per se to a person skilled in the art. This distance may also be determined capacitively or in some other electromagnetic way suitable for a measurement made through the web.
  • the distance D1 between the optical measurement sensor 12 and the first or upper surface 2' of the moving fibre web 2 or a variable indicating it, determined by the optical measuring sensor 12, is transmitted to a data processing unit 17 in the first measuring head 3.
  • the distance D2 between the optical measuring sensor 12 and the reference element 10 or a variable indicating it, determined by the electromagnetic measuring sensors 16, is transmitted to the data processing unit 17 in the first measuring head 3.
  • the data processing unit 17 comprises the necessary calculation and memory units and software for the calculation of the caliper of the moving fibre web 2.
  • the caliper C of the moving fibre web 2 is then obtained by subtracting from the distance D2 between the optical measuring sensor 12 and the reference element 10 the distance D1 between the optical measurement sensor 12 and the first or upper surface 2' of the moving fibre web 2.
  • the electromagnetic measuring sensors 16 and the optical measuring sensor 12 are arranged in the first measuring head 3 so that their distance to the reference element 10 is not exactly the same in the direction of the distance to be measured and this offset in the position of the electromagnetic measuring sensors 16 in respect to the position of the optical measuring sensor 12 is taken into account when the distance D2 between the optical measuring sensor 12 and the reference element 10 is determined by the electromagnetic measuring sensors 16 or when the caliper C is determined such that a correct value for the distance of the optical measuring sensor 12 from the reference plate 10 is used in the calculation.
  • the wavelength of the optical measuring signal 14 is selected to be less than or equal to 500 nm.
  • the optical measuring signal 14 may have a wavelength selected for example from a range of variation of about 360 nm to 490 nm, this substantially corresponding to a visible light having a spectral colour of violet and/or blue.
  • the optical measuring signal 14 may also have a wavelength selected from a range of variation of about 430 nm to 500 nm, this substantially corresponding to a visible light having a spectral colour of blue.
  • the wavelength of the optical measuring signal 14 may also be selected from a range of variation of about 360 nm to 430 nm, this substantially corresponding violet in terms of the spectral colour of visible light.
  • the wavelength of the optical measuring signal 14 is selected to be less than 360 nm, whereby the optical measuring signal 14 is selected from the wavelength area corresponding to ultraviolet light or UV light.
  • the wavelength of the optical measuring signal may thus be for example 262 nm, 266 nm, 349 nm, 351 nm, 355 nm, 375 nm, 405 nm, 430 nm, 440 nm, 442 nm, 445 nm, 447 nm, 457 nm, 473 nm, 488 nm or 490 nm, wherein this value of the wavelength may represent the exact wavelength of the optical measuring signal provided by the optical measuring sensor or the average wavelength of the optical measuring signal provided by the optical measuring sensor, depending on the optical measuring sensor.
  • the wavelength of the optical measuring signal 14 is less than or equal to 500 nm, the wavelength of the optical measuring signal 14 is remarkably shorter than the wavelength of the optical measuring signal 14 in the presently available optical measuring sensors 12 based on red light technology, where the wavelength of the optical measuring signal may be as high as 740 - 750 nm. Due to the shorter or smaller wavelength of the optical measuring signal 14 than previously, the penetration of the measuring signal through the surface of the porous fibre web inside the fibre web 2 is smaller than previously. Resulting from this, when the penetration of the optical measuring signal 14 through the surface of the fibre web 2 is smaller than previously, the measured distance D1 between the optical measuring sensor 12 and the fibre web 2 is more accurate than previously. Also the backscattering of the optical measuring signal from the surface of the fibre web is or stronger than previously, providing a more reliable measurement process or event.
  • Figures 2a and 2b show schematic cross-sectional side views of a second measuring device 1 for measuring a caliper of fibre web 2 moving in the direction of arrow A.
  • the measuring device 1 according to Figures 2a and 2b is substantially similar as the measuring device 1 according to Figure 1 , with the exception that the measuring device 1 of Figures 2a and 2b comprises also means for calibrating the optical measuring sensor 12 and the electromagnetic measuring sensor 16.
  • the optical measuring sensor 12 may be a laser, similar to a laser triangulation sensor, for example, or some other optical measuring device, for example an optical measuring device utilizing a confocal chromatic aberration method.
  • the measuring device 1 according to Figures 2a and 2b comprises only one electromagnetic measuring sensor 16 and there is no substantial offset between the positions of the optical measuring sensor 12 and electromagnetic measuring sensor 16 in the direction of the distance to be measured.
  • Figure 2a is a schematic view of the measuring device 1 during the measurement of the caliper C of the moving fibre web 2 and Figure 2b is a schematic view of the measuring device 1 of Figure 2a during a step in the calibration of the measuring device 1 .
  • the second measuring head 4 is provided with a reference element shifter 18, which in the example of Figures 2a and 2b includes a step motor 19 as an actuator and a shaft 20 coupled between the step motor 19 and the reference element 10.
  • the step motor 19 the shaft 20 may be moved linearly, for example, thus allowing the distance of the reference element 10 from the optical measuring sensor 12 and the electromagnetic measuring sensor 16 to be changed.
  • the step motor 19 may be replaced by any other actuator device suitable for the purpose.
  • the reference element 10 When the measuring device 1 is being calibrated, the reference element 10 is moved by means of the shaft 20 and the step motor 19 in the direction of arrow B to different distances from the sensors 12 and 16, thereby changing the distance of the reference piece 10 and the fibre web 2 supported thereto from the sensors 12 and 16, the fibre web 2 moving in the direction of arrow A at the same time.
  • the reference element 10 and the moving fibre web 2 supported thereto are moved for a small distance at a time, for example 20 microns, in relation to the sensors 12 and 16.
  • the reference element 10 and the web 2 supported thereto are moved to a new position in relation to the sensors 12 and 16 for as many times as is required for covering the entire area of measurement of the measuring device 1 at a desired number of calibration points.
  • the values D1 , D2 of the sensors 12 and 16 are read at each calibration point and then the sensors 12 and 16 are calibrated in relation to each other such that the responses of both sensors are the same within the entire measurement range of the measuring device 1 , which may typically vary by ⁇ 300 microns, for example, from the normal measurement distance. In other words, the sensors 12 and 16 are calibrated to be uniform in relation to the movement of the reference piece 10.
  • the calibration of the optical measuring sensor 12 and the electromagnetic measuring sensor 16 in relation to each other may be carried out at a data processing unit 17 arranged at the first measuring head 3, where the measurement results D1 and D2 of the sensors 12 and 16 are conveyed, the data processing unit 17 also comprising the necessary calculation and memory units and software for calibrating the sensors 12 and 16 in relation to each other.
  • the calibration may be carried out in a manner known per se to a skilled person, such as by interpolation or by forming a polynomial function from the calibration points.
  • a typical way of performing the calibration is to use an optical laser triangulation measuring sensor 12 offering a better linearity as the primary sensor, which is then used to teach the electromagnetic measuring sensor 16 to show the same value or the same movement as the primary sensor within a desired measurement range.
  • the reference element 10 is returned to the normal operational height for the normal measuring operation of the measuring device 1 .
  • the optical measuring sensor 12 and the electromagnetic measuring sensor 16 of the measuring device 1 are thus calibrated using the fibre web 2 to be manufactured, i.e. a moving web. Calibration performed in relation to the web 2 to be manufactured enables to take into account not only external factors but also all parameters associated with the object to be measured and having an impact also during the measurement event. This means that after the calibration there will be no error caused by phase shift in the measurement result as for example in prior art calibration carried out only in relation to the reference element 10 without the fibre web 2 between the sensors 12 and 16 and the reference element 10, or by using a previously known separate calibration sample, whose actual characteristics differ from those of the web to be measured.
  • the wavelength of the optical measuring signal 14 is again selected to be less than or equal to 500 nm, meaning that the optical measuring signal 14 may have a wavelength selected from a range of variation of about 360 nm to 490 nm, for example.
  • the wavelength of the optical measuring signal 14 may be selected from a range of variation of about 360 nm to 430 nm or from a range of variation of about 430 nm to 500 nm.
  • the wavelength of the optical measuring signal 14 may also be selected to be less than 360 nm.
  • the wavelength of the optical measuring signal 14 is less than or equal to 500 nm, the wavelength of the optical measuring signal is remarkably shorter than the wavelength of the optical measuring signal in the prior art optical measuring sensors based on red light technology. Due to the shorter wavelength of the optical measuring signal the penetration of the measuring signal through the surface of the porous fibre web inside the fibre web 2 is smaller than previously, this resulting to a more accurate measured distance D1 between the optical measuring sensor 12 and the fibre web 2 than previously, which increases the accuracy of the calibration of the sensors 12 and 16. Also, because backscattering of the optical measuring signal from the surface of the fibre web is stronger than previously, not only a more reliable measurement process but also a more reliable calibration process is obtained.
  • Figure 3 shows a schematic cross-sectional side view of a third measuring device 1 for measuring a caliper of the fibre web 2 moving in the direction of arrow A.
  • the measuring device 1 is a non-contacting measuring device meaning that the moving fibre web 2 is not intentionally in actual contact with any reference element during the measurement of the caliper C of the moving fibre web 2.
  • the measuring device 1 has a first measuring head 3 arranged on the side of the first surface 2' of the fibre web 2 and a second measuring head 4 arranged on the side of the second surface 2" of the fibre web 2 so that between the measuring heads 3, 4 there is an air gap 5 where the fibre web 2 moves at a high speed.
  • the measuring heads 3 and 4 are shown very schematically in Figure 2 such that the frame structure 3', 4' of the measuring heads 3, 4 are shown only on the side facing the moving fibre web 2.
  • the first measuring head 3 comprises a first optical measuring sensor 21 arranged to measure by means of an optical measuring signal a distance D1 between the first optical measuring sensor 21 and the moving fibre web 2.
  • the second measuring head 4 comprises a second optical measuring sensor 22 arranged to measure by means of an optical measuring signal a distance D3 between the second optical measuring sensor 22 and the moving fibre web 2.
  • the wavelength of the optical measuring signal provided by the first optical measuring sensor 21 and the second optical measuring sensor 22 is selected to be less than or equal to 500 nm as in the embodiments of Figures 1 and 2 and it has similar advantageous effects as disclosed in the connection of the embodiments of Figures 1 and 2.
  • the optical measuring sensors 21 and 22 may be lasers, such as laser triangulation sensors, or some other optical measuring devices, for example optical measuring devices utilizing a confocal chromatic aberration method.
  • the first measuring head 3 further comprises an annular electromagnetic measuring sensor 16 having a central opening 16' through which the first optical measuring sensor 21 is arranged to measure the distance D1 between the first optical measuring sensor 21 and the moving fibre web 2.
  • the second measuring head 4 further comprises an annular target element 23 having a central opening 23' through which the second optical measuring sensor 22 is arranged to measure the distance D3 between the second optical measuring sensor 22 and the moving fibre web 2 at the same spot where the distance D1 between the first optical measuring sensor 21 and the moving fibre web 2 is measured but on the opposite side of the moving fibre web 2.
  • the target element 23 is made of same kind of material as the reference element 10 in Figures 1 and 2, the electromagnetic measuring sensor 16 being able to measure the distance D4 between the measuring heads 3 and 4.
  • the distances D1 , D3 and D4 are transmitted to a data control unit 17, wherein the distance D1 between the first optical measuring sensor 21 and the moving fibre web 2 and the distance D3 between the second optical measuring sensor 22 and the moving fibre web 2 are subtracted from the distance describing the distance between the first and second optical measuring sensors 21 and 22.
  • the moving fibre web 2 moves in the air gap 5 between the measuring heads 3, 4 without any intentional contact to the measuring heads 3, 4.
  • the web 2 may warp or curl or have wrinkles in the air gap 5.
  • the frame structure 3' of the measuring head 3 may comprise openings 24 and the frame structure 4' of the measuring head 4 may comprise openings 25, through which air flows F may be directed towards the moving fibre web 2 in the air gap 5.
  • Same kind of air flows F may be directed to the moving fibre web 2 in the air gap 5 also through the opening 16' in the electromagnetic measuring sensor 16 and the opening 23' in the target element 23.
  • an air cushion stabilizing the movement of the moving fibre web 2 in the air gap 5 may be provided on the side of the first surface 2' and the second surface 2" of the moving fibre web 2 in the air gap 5.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Length Measuring Devices By Optical Means (AREA)

Abstract

La présente invention concerne un procédé et un dispositif de mesure (1) destinés à mesurer l'épaisseur (C) d'une bande fibreuse mobile (2). Le procédé consiste à mesurer une distance entre au moins un capteur de mesure optique (12, 21, 22) et au moins une surface (2', 2'') de la bande fibreuse mobile (2) au moyen du signal de mesure optique (14) fourni par le capteur de mesure optique (12, 21, 22), la longueur d'onde du signal de mesure optique (14) étant inférieure ou égale à 500 nm. (Figure 1)
PCT/FI2011/050645 2011-07-08 2011-07-08 Procédé et dispositif de mesure destinés à mesurer l'épaisseur d'une bande fibreuse mobile Ceased WO2013007864A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2011/050645 WO2013007864A1 (fr) 2011-07-08 2011-07-08 Procédé et dispositif de mesure destinés à mesurer l'épaisseur d'une bande fibreuse mobile

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2011/050645 WO2013007864A1 (fr) 2011-07-08 2011-07-08 Procédé et dispositif de mesure destinés à mesurer l'épaisseur d'une bande fibreuse mobile

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WO2013007864A1 true WO2013007864A1 (fr) 2013-01-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9284686B1 (en) 2014-10-30 2016-03-15 The Procter & Gamble Company Process to improve the convertability of parent rolls
CN109238092A (zh) * 2018-09-14 2019-01-18 佛山市恒力泰机械有限公司 陶瓷砖坯厚度在线自动检测方法及装置
US11828736B2 (en) 2018-05-03 2023-11-28 Valmet Automation Oy Measurement of elastic modulus of moving web

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355083A (en) * 1988-11-16 1994-10-11 Measurex Corporation Non-contact sensor and method using inductance and laser distance measurements for measuring the thickness of a layer of material overlaying a substrate
US20050073694A1 (en) * 2003-10-03 2005-04-07 Honeywell International Inc. Means for in-place automated calibration of optically-based thickness sensor
US20050157314A1 (en) * 2003-12-22 2005-07-21 Pekka Typpoe Measuring device
WO2007104833A1 (fr) * 2006-03-10 2007-09-20 Metso Automation Oy Procede d'etalonnage d'equipement de mesure et equipement de mesure

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5355083A (en) * 1988-11-16 1994-10-11 Measurex Corporation Non-contact sensor and method using inductance and laser distance measurements for measuring the thickness of a layer of material overlaying a substrate
US20050073694A1 (en) * 2003-10-03 2005-04-07 Honeywell International Inc. Means for in-place automated calibration of optically-based thickness sensor
US20050157314A1 (en) * 2003-12-22 2005-07-21 Pekka Typpoe Measuring device
WO2007104833A1 (fr) * 2006-03-10 2007-09-20 Metso Automation Oy Procede d'etalonnage d'equipement de mesure et equipement de mesure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9284686B1 (en) 2014-10-30 2016-03-15 The Procter & Gamble Company Process to improve the convertability of parent rolls
US9546449B2 (en) 2014-10-30 2017-01-17 The Procter & Gamble Company Process to improve the convertability of parent rolls
US9695550B2 (en) 2014-10-30 2017-07-04 The Procter & Gamble Company Process to improve the convertability of parent rolls
US11828736B2 (en) 2018-05-03 2023-11-28 Valmet Automation Oy Measurement of elastic modulus of moving web
CN109238092A (zh) * 2018-09-14 2019-01-18 佛山市恒力泰机械有限公司 陶瓷砖坯厚度在线自动检测方法及装置

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