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WO1992015837A1 - Procede holographique destine a obtenir une mesure quantitative de similitude - Google Patents

Procede holographique destine a obtenir une mesure quantitative de similitude Download PDF

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Publication number
WO1992015837A1
WO1992015837A1 PCT/SE1992/000120 SE9200120W WO9215837A1 WO 1992015837 A1 WO1992015837 A1 WO 1992015837A1 SE 9200120 W SE9200120 W SE 9200120W WO 9215837 A1 WO9215837 A1 WO 9215837A1
Authority
WO
WIPO (PCT)
Prior art keywords
pulse
expanded
hologram
illuminated
comparison
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/SE1992/000120
Other languages
English (en)
Inventor
Nils Abramson
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of WO1992015837A1 publication Critical patent/WO1992015837A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
    • G01B9/00—Measuring instruments characterised by the use of optical techniques
    • G01B9/02—Interferometers
    • G01B9/021—Interferometers using holographic techniques
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H2001/0066—Adaptation of holography to specific applications for wavefront matching wherein the hologram is arranged to convert a predetermined wavefront into a comprehensive wave, e.g. associative memory
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/0465—Particular recording light; Beam shape or geometry
    • G03H2001/0467—Gated recording using pulsed or low coherence light source, e.g. light in flight, first arriving light
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H1/2205—Reconstruction geometries or arrangements using downstream optical component
    • G03H2001/2213—Diffusing screen revealing the real holobject, e.g. container filed with gel to reveal the 3D holobject
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/22—Processes or apparatus for obtaining an optical image from holograms
    • G03H1/2202—Reconstruction geometries or arrangements
    • G03H2001/2244—Means for detecting or recording the holobject
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2222/00—Light sources or light beam properties
    • G03H2222/33—Pulsed light beam

Definitions

  • an ultrashort laserpulse is used to produce a hologram e.g. of an accurate product, the master. Then the product to be tested is illuminated with the holographic image of the master. For this purpose the holo ⁇ gram is reconstructed, again using an ultrashort laserpulse. The result is that out from the product is emitted a pulse the length of which can be used as a measure of the difference * in shape between master and test object. If there is no difference, the pulse length is in principle equal to that of the original pulse.
  • One advantage is that only one hologram (that of the master) has to be made. Any number of products may then be compared against this hologram.
  • Another advantage is that the result is not in the form of a fringe pattern that has to be evalua- ted more or less manually, but just only a signal the length or form of which may Le measured. This signal represents not just one measurement but thousands of measuring points are inspected and compared within a time span of a few nanose- conds.
  • Fig 1 and Fig 2 show the respective setups for recording and reconstruction in an exemplary embodiment.
  • a laser (Fig. 1) produces a laser beam consisting of one picosecond pulse.
  • a beamsplitter (BS) reflects part of the beam via two mirrors to a negative lens, which widens the beam so that it illuminates the whole object (O) . This beam is named the object beam.
  • the other part of the beam passes through the beamsplitter and travels via two mirrors to a collimator (C.) consisting of a negative plus a positive lens which widens this beam so that is illuminates the whole hologram plate (H) .
  • This beam is named the reference beam.
  • S. represents a stop used to block the beam used for the second step.
  • the result of the holographic exposure will be a Light-in-flight hologram.
  • a closer part (D) of the object (C) is recorded further to the left (at E) on the holographic plate (H) .
  • An object part (F) which is further away will be recorded more to the right (at 6) on the plate. After exposure the plate is developed, fixed and dried and finally placed back at exactly the same position as when it was exposed.
  • the procedure that we have now described represents a holo ⁇ graphic recording of the master object, to which other test- objects are to be compared.
  • the master is an object that has been dimensionally very accurately measured and found to be accepted and of good quality.
  • testobjects are to be compared to the master to find out if they are to be accepted or rejected.
  • both the object beam and the reference beam are shut off by the stops S2, S3, (Fig. 2).
  • the hologram plate is illuminated with a beam (the reconstruction beam) that is antiparallel to the former reference beam and the pathlength of which can be adjusted by moving a reflector (R).
  • this reconstruction beam which consists of a picosecond pulse, illuminates the hologram plate from the back side through the colli ator C 2 , and moves from right to left. As it moves over the plate it first hits the part (G) and by diffraction emits a pulse towards (F), which is a part on the object that is further away.
  • the length of the pulse arriving at (DET) is a measure of the dimensional dif ⁇ ference between the recorded and the studied object.
  • a photo- detector situated anywhere along the beam could give a signal that tells if the studied test object should be accepted or rejected.
  • the detector could consist of just an ultrafast electronic lightdetector or a slower detector in combination with a Kerr cell, a Pockel cell, nonlinear medium 6, streak camera, autocorrelator or the like.
  • the detector could also consist of another set up for Light- in-flight recording.
  • the negative lens of the beam expander could be removed and replaced by a second hologram plate with its reference pulse.
  • the image of the test object reconstructed from that hologram would then appear bright if it is identical to the master, but where it differs in shape it would appear dark.
  • the invention can be used for the control of products against the virtual master created by the hologram plate. It is also possible to establish the degree of symmetry for e.g. a propeller or a turbinerotor, which should present itself exactly alike if rotated by a predetermined angle.
  • manipulating appara ⁇ tus for automatically adjusting the position (in e.g. six dimensions) for which the measured pulse length has a minimum value.
  • corner-cube reflector R which defines the pathlength between the laser and the plate in Fig. 2 is expendable, unless needed in order to obtain proper timing for Kerr-cell shutters or the like in front of detec ⁇ tor DET.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Holo Graphy (AREA)

Abstract

Un laser (L) produit une impulsion courte qui est divisée en un faisceau de référence dilaté incident à un angle donné contre une plaque photographique (H) et un faisceau d'illumination dilaté qui illumine un objet modèle (O). La plaque est développée pour former une image holographique et remontée dans la même position. Un objet de comparaison est alors placé dans la même position que l'objet modèle. La plaque (H) est illuminée depuis sa face opposée à l'aide d'un faisceau dilaté à impulsion courte antiparallèle au faisceau de référence, la lumière diffractée de l'image sur la plaque illuminant l'objet à comparer. De la lumière ramenée antiparallèlement par rapport au faisceau d'illumination dilaté est guidée vers un détecteur (D), le spectre de temps indiquant le degré de similitude entre l'objet modèle et l'objet à comparer.
PCT/SE1992/000120 1991-02-28 1992-02-27 Procede holographique destine a obtenir une mesure quantitative de similitude Ceased WO1992015837A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9100575A SE9100575D0 (sv) 1991-02-28 1991-02-28 A holographic method and device for obtaining a quantitative likeness measure
SE9100575-1 1991-02-28

Publications (1)

Publication Number Publication Date
WO1992015837A1 true WO1992015837A1 (fr) 1992-09-17

Family

ID=20382001

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/SE1992/000120 Ceased WO1992015837A1 (fr) 1991-02-28 1992-02-27 Procede holographique destine a obtenir une mesure quantitative de similitude

Country Status (2)

Country Link
SE (1) SE9100575D0 (fr)
WO (1) WO1992015837A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004025567A3 (fr) * 2002-09-12 2004-06-24 Nline Corp Systeme et procede d'acquisition et de traitement d'images complexes

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
APPLIED OPTICS, Vol. 22, No. 2, January 1983, N. ABRAMSON: "Light-in-flight recording: high-speed holographic motion pictures of ultrafast phenomena", see page 215 - page 232. *
APPLIED OPTICS, Vol. 28, No. 10, May 1989, N.H. ABRAMSON et al.: "Single pulse light-in-flight recording by holography", see pages 1834 - page 1841. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2004025567A3 (fr) * 2002-09-12 2004-06-24 Nline Corp Systeme et procede d'acquisition et de traitement d'images complexes

Also Published As

Publication number Publication date
SE9100575D0 (sv) 1991-02-28

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