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WO2018001568A2 - Capteur de précipitation - Google Patents

Capteur de précipitation Download PDF

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Publication number
WO2018001568A2
WO2018001568A2 PCT/EP2017/025111 EP2017025111W WO2018001568A2 WO 2018001568 A2 WO2018001568 A2 WO 2018001568A2 EP 2017025111 W EP2017025111 W EP 2017025111W WO 2018001568 A2 WO2018001568 A2 WO 2018001568A2
Authority
WO
WIPO (PCT)
Prior art keywords
electromagnetic radiation
precipitation
light
detection region
fall detection
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/EP2017/025111
Other languages
English (en)
Other versions
WO2018001568A3 (fr
Inventor
Robin Bacon
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.)
GILL INSTRUMENTS Ltd
Original Assignee
GILL INSTRUMENTS Ltd
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 GILL INSTRUMENTS Ltd filed Critical GILL INSTRUMENTS Ltd
Publication of WO2018001568A2 publication Critical patent/WO2018001568A2/fr
Publication of WO2018001568A3 publication Critical patent/WO2018001568A3/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/538—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke for determining atmospheric attenuation and visibility
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N15/14—Optical investigation techniques, e.g. flow cytometry
    • G01N15/1456—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals
    • G01N15/1459—Optical investigation techniques, e.g. flow cytometry without spatial resolution of the texture or inner structure of the particle, e.g. processing of pulse signals the analysis being performed on a sample stream
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/49—Scattering, i.e. diffuse reflection within a body or fluid
    • G01N21/53—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke
    • G01N21/532—Scattering, i.e. diffuse reflection within a body or fluid within a flowing fluid, e.g. smoke with measurement of scattering and transmission
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01W—METEOROLOGY
    • G01W1/00—Meteorology
    • G01W1/14—Rainfall or precipitation gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N2015/0042—Investigating dispersion of solids
    • G01N2015/0046—Investigating dispersion of solids in gas, e.g. smoke
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/10—Investigating individual particles
    • G01N2015/1027—Determining speed or velocity of a particle
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N2021/4704—Angular selective
    • G01N2021/4711—Multiangle measurement

Definitions

  • the present invention relates to a precipitation sensor comprising an electromagnetic radiation source and at least one electromagnetic radiation detector located to receive electromagnetic radiation which was emitted by the source and was incident upon precipitation when the sensor is in use.
  • Such a sensor is described in US7122820B2.
  • a light transmitter directs light towards a first light receiver located opposite the light transmitter, and further light receivers are arranged at different scattering angles. Signals from the receivers are fed into evaluation electronics to measure the amount of precipitation and to determine the type of precipitation.
  • a disadvantage of such a construction is that the same light source is used for in-line transmission as well as for refraction and reflection.
  • the drop in signal from the first light receiver is quite significant even for one precipitation particle entering a detection zone of the sensor, so quite a low level of light is sufficient for a good signal-to-noise ratio.
  • a much stronger light intensity is required to obtain a good signal-to-noise ratio for refracted and reflected light. Since there is only one light source, and for detection of particles this has to be on throughout a detection period, it has to transmit and maintain light at a higher intensity than is necessary to detect the drop in the signal from the first light receiver owing to the presence of a precipitation particle in the detection zone. This requires a high power consumption, with a consequent drain on batteries and relatively early burn out of the source LED or whatever other source of light is used.
  • a first aspect of the present invention seeks to provide a remedy.
  • a first aspect of the present invention is directed to a precipitation sensor comprising a first electromagnetic radiation source and an electromagnetic radiation detector, the said first electromagnetic radiation source being oriented to direct electromagnetic radiation towards the electromagnetic radiation detector via a precipitation free-fall detection region when the sensor is in use, characterised in that precipitation sensor further comprises at least one further electromagnetic radiation source oriented to direct electromagnetic radiation towards the said precipitation free-fall detection region along a direction which is at a given scattering angle to the direction of light from the said first electromagnetic radiation source.
  • Such a construction enables the velocity of a particle or object which passes into the precipitation free-fall detection region to be measured by the time it takes for the particle or object to pass through that region, and hence for a distinction to be made between the behaviour for example of a free-falling object and a flying insect.
  • the amount of light detected by the electromagnetic radiation detector emanating from the said at least one further electromagnetic radiation source as a measure of light reflected of refracted by a precipitation particle within the detection region when the sensor is in use, provides further information to enable the sensor to distinguish between for example a snowflake and a raindrop.
  • the sensor may further comprise a second further electromagnetic radiation source oriented to direct electromagnetic radiation towards the said precipitation free-fall detection region along a direction which is at a further scattering angle to the direction of light from the said first electromagnetic radiation source and also at an angle to the direction of light from the said at least one further electromagnetic radiation source, such that light from the said at least one further electromagnetic radiation source is reflected by a precipitation particle within the detection region towards the electromagnetic radiation detector when the sensor is in use, and light from the said second further electromagnetic radiation source is refracted by a precipitation particle within the detection region towards the electromagnetic radiation detector when the sensor is in use.
  • a second further electromagnetic radiation source oriented to direct electromagnetic radiation towards the said precipitation free-fall detection region along a direction which is at a further scattering angle to the direction of light from the said first electromagnetic radiation source and also at an angle to the direction of light from the said at least one further electromagnetic radiation source, such that light from the said at least one further electromagnetic radiation source is reflected by a precipitation particle within the detection region towards the electromagnetic radiation detector when the sensor is
  • the said given scattering angle may be in the range from 70° to 120°, more preferably 95°, relative to the direction of radiation from the said first electromagnetic radiation source.
  • the said further scattering angle may be in the range from 20° to 40°, more preferably 30°, relative to the direction of radiation from the said first electromagnetic radiation source.
  • a further disadvantage of the sensor described in US7122820B2 is that it is unable to provide successive measurements of the velocity of the particle or object which it detects, and this in turn makes it difficult for the evaluation electronics to distinguish between the detection of precipitation on the one hand, and the detection of irrelevant objects such as insects and leaves .
  • a second aspect of the present invention seeks to provide a remedy.
  • the second aspect of the present invention is directed to a precipitation sensor comprising at least two electromagnetic radiation sources oriented to direct electromagnetic radiation towards respective precipitation free-fall detection regions located one above the other when the sensor is in use, and at least two respective electromagnetic radiation detectors each located to receive such radiation which was emitted by the associated electromagnetic radiation source and which entered the associated precipitation free-fall detection region when the sensor is in use.
  • Such a construction enables the velocity of a particle or object which passes into the precipitation free-fall detection regions to be measured by the time it takes for the particle or object to pass through those regions, and hence for a distinction to be made between the behaviour for example of a free-falling object and a flying insect.
  • Each electromagnetic radiation detector may be generally co-linear with its associated electromagnetic radiation source and its associated precipitation free- fall detection region.
  • the angle between an imaginary line passing through respective centres of one of the said at least two electromagnetic radiation sources and its associated precipitation free-fall detection region and an imaginary line passing through the respective centres of the other of the said at least two electromagnetic radiation sources and its associated precipitation free-fall detection region may be in the range from 70° to 110°, more preferably 90°, when viewed along a line passing through the centres of the precipitation free-fall detection regions.
  • the respective precipitation free- fall detection regions will be defined by those regions between the said at least two electromagnetic radiation sources and their associated electromagnetic radiation detectors which overlap one another as viewed from above when the sensor is in use.
  • Each electromagnetic radiation detector may be provided with a further electromagnetic radiation source arranged to direct radiation towards the associated precipitation free-fall detection region at an angle in the range from 20° to 40°, more preferably 30°, relative to the direction of transmission from the associated one of the said two electromagnetic radiation sources.
  • Each electromagnetic radiation detector may be provided with a further electromagnetic radiation source arranged to direct radiation towards the associated precipitation free-fall detection region at an angle in the range from 70° to 120°, more preferably 95°, relative to the direction of transmission from the associated one of the said two electromagnetic radiation sources.
  • the electromagnetic radiation from the sources and the electromagnetic radiation detected by the detectors is light. This enables a clear distinction to be made between light refracted and or reflected by particles of the different states of water, for example enabling snowflakes to be distinguished readily from raindrops .
  • the present invention extends to a method of monitoring precipitation using a sensor in accordance with the first aspect or the second aspect of the present invention .
  • Figure 1 shows diagrammatically a plan view of the arrangement of light sources and a light detector of an embodiment of the first aspect of the present invention, together with electrical and electronic circuitry connected to those sources and that detector;
  • Figure la shows circuitry in greater detail of three devices shown in Figure 1 ;
  • Figure 2 shows diagrammatically a plan view of the arrangement of light sources and light detectors of an embodiment of both the first and the second aspects of the present invention, together with electrical and electronic circuitry connected to those sources and detectors ;
  • Figure 2a shows circuitry in greater detail of three devices shown in Figure 2 ;
  • Figure 3 shows diagrammatically and elevational view of the sources and detectors shown in Figure 2;
  • Figure 4 shows an explanatory graph.
  • the precipitation sensor 10 shown in Figure 1 comprises a light source 12 arranged to direct light through a precipitation free-fall detection region or zone 14 to a light receiver or detector 16.
  • the detection zone 14 lies midway between the source 12 and the detector 16.
  • the source 12 and the detector 16 are at substantially the same horizontal level as one another .
  • Further light sources 18 and 20 are provided oriented and located to direct light towards the detection zone 14 at angles of 95° and 30° respectively to the direction of light passing from the source 12 through the detection zone 14 to the light detector 16. These sources 18 and 20 are thus able to direct light towards the detection zone 14 such that light is reflected and refracted respectively from a precipitation particle falling through the detection zone 14, towards the light detector 16.
  • the electronic circuitry of the precipitation sensor 10 is shown in Figure 1, and comprises three oscillator/modulator devices 30 connected to be controlled by a microprocessor 44, and to deliver a modulated electrical current to the light sources 12, 18 and 20 at respective different oscillator frequencies.
  • Each oscillator/modulator device 30 is as shown in greater detail in Figure la. Thus it comprises an oscillator 32 connected to be controlled by the microprocessor 44, and a modulated current source 34 connected to be modulated by the oscillator 32 and to deliver a modulated electrical current to its associated light source 12, 18 or 20.
  • Signals from the light detector 16 are delivered to an analogue to digital converter 36 via a low pass filter 38. Signals from that converter 36 are forwarded to three multipliers 40 also connected to respective ones of the oscillators 32 and to the microprocessor 44 in which signal analysis occurs. The multipliers 40 enable the microprocessor 44 to distinguish between signals from the different light sources 12, 18 and 20 respectively.
  • Figure 4 shows a graph of the received light level in the light receiver or detector 16, plotted as a function of time along the horizontal axis.
  • the light source 12 is switched on continuously, so that the normal level of light received by the light detector 16 or 24 is as shown by horizontal lines a and g in Figure 4.
  • the microprocessor 44 will measure a drop in the signal of light received from the light source 12 by the light detector 16, represented by the steeply falling line b in Figure 4.
  • the microprocessor 44 After a predetermined interval represented by the horizontal line c, corresponding to a period in which the snow-flake is wholly within the detection zone 14, the microprocessor 44 is programmed to issue a short pulse to the light source 20 for a period indicated by the line d, and another short pulse to the light source 18 indicated by the line e.
  • the snowflake then exits the detection zone 14 so that the detected light signal in the microprocessor 44 rises through a steep incline f to the level it had earlier, represented by the line g.
  • the period from b to f gives the time it took the snowflake to fall through the detection zone 14, which enables the velocity of the snowflake to be calculated by the microprocessor 44 given that the height of the detection zone 14 is known.
  • the relatively high level of reflected light indicated by the level of the line e above the line c compared to that of refracted light indicated by the level of the line d above the line c indicates that it was indeed a snowflake that was detected and not for example a raindrop.
  • a first criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly. Furthermore, provided the velocity of the snowflake measured as it passes through the detection zone 14 is the same or is no more different than a predetermined threshold level, the microprocessor 44 will recognise the signals that receives as belonging to a precipitation particle, and not for example an insect, and a second criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly.
  • a third criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly if all three criteria are met, that increase is effected by the microprocessor 44.
  • the amount of the increase is indicated by the size of the drop in the signal received by the detector 16.
  • the precipitation sensor 10 shown in Figures 2 and 3 comprises a first light source 12 arranged to direct light through a precipitation free- fall detection region or zone 14 to a light receiver or detector 16.
  • the detection zone 14 lies midway between the source 12 and the detector 16.
  • the source 12 and the detector 16 are at substantially the same horizontal level as one another.
  • Further light sources 18 and 20 are provided oriented and located to direct light towards the detection zone 14 at angles of 95° and 30° respectively to the direction of light passing from the source 12 through the detection zone 14 to the light detector 16. These sources 18 and 20 are thus able to direct light towards the detection zone 14 such that light is reflected and refracted respectively from a precipitation particle falling through the detection zone 14, towards the light detector 16.
  • Located directly below the set of devices comprising the light sources 12, 18 and 20 and the detector 16 is a further such set located below the first set and oriented at 90° to the first set as viewed from above.
  • the second set comprises a light source 22 arranged to direct light through a second detection region or zone of the sensor 10 located immediately below the zone 14 and therefore obscured from view by that latter zone in Figure 2, to a light receiver or detector 24.
  • the second detection zone lies midway between the light source 22 and the detector 24.
  • the light detector 24 is provided with two further light sources 26 and 28 oriented and located to direct light towards the second detection zone at angles of 95° and 30° respectively to the direction of light passing from the source 22 through the second detection zone to the light detector 24. These sources 26 and 28 are thus able to direct light towards the second detection zone such that light is reflected and refracted respectively from a precipitation particle falling through the second detection zone, towards the light detector 24.
  • the electronic circuitry of the precipitation sensor 10 is shown in Figure 2, and comprises three oscillator/modulator devices 30 connected to be controlled by a microprocessor 44, and to deliver a modulated electrical current to the light sources 12, 18 and 20 at respective different oscillator frequencies.
  • Each oscillator/modulator device 30 is as shown in greater detail in Figure 2a.
  • it comprises an oscillator 32 connected to be controlled by the microprocessor 44, and a modulated current source 34 connected to be modulated by the oscillator 32 and to deliver a modulated electrical current to its associated light source 12, 18 or 20..
  • Signals from the light detector 16 are delivered to an analogue to digital converter 36 via a low pass filter 38. Signals from that converter 36 are forwarded to 3 multipliers 40 also connected to respective ones of the oscillators 32 to the microprocessor 44 in which signal analysis occurs. The multipliers 40 enable the microprocessor 44 to distinguish between signals from the different light sources 12, 18 and 20 respectively.
  • the light sources 22, 26 and 28 and the light detector 24 are connected to the microprocessor 44 in precisely the same manner as the light sources 12, 18 and 20 and the light detector 16, except that each oscillator 32 for the light sources 22, 26 and 28 has a different frequency from all the oscillators 32 associated with the light sources 12, 18 and 20.
  • Figure 4 shows a graph of the received light level in one or other of the light receivers 16 and 24, plotted as a function of time along the horizontal axis.
  • the light sources 12 and 22 are switched on continuously, so that the normal level of light received by the light detector 16 or 24 is as shown by horizontal lines a and g in Figure 4.
  • the microprocessor 44 will measure a drop in the signal of light received from the light source 12 by the light detector 16, represented by the steeply falling line b in Figure 4.
  • the microprocessor 44 After a predetermined interval represented by the horizontal line c, corresponding to a period in which the snow-flake is wholly within the detection zone 14, the microprocessor 44 is programmed to issue a short pulse to the light source 20 for a period indicated by the line d, and another short pulse to the light source 18 indicated by the line e.
  • the snowflake then exits the detection zone 14 so that the detected light signal in the microprocessor 44 rises through a steep incline f to the level it had earlier, represented by the line g.
  • the period from b to f gives the time it took the snowflake to fall through the detection zone 14, which enables the velocity of the snowflake to be calculated by the microprocessor 44 given that the height of the detection zone 14 is known.
  • the relatively high level of reflected light indicated by the level of the line e above the line c compared to that of refracted light indicated by the level of the line d above the line c indicates that it was indeed a snowflake that was detected and not for example a raindrop.
  • the time it takes for the snowflake to fall through the second detection zone measured by the time of the drop in signal level from the detector 24, enables the velocity of the snowflake to be calculated in the microprocessor 44 for a second time, given that the height of the second detection zone is also known.
  • a first criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly. Furthermore, provided the velocities of the snowflake measured as it passes through the two detection zones are the same or are no more different than a predetermined threshold level, the microprocessor 44 will recognise the signals that receives as belonging to a precipitation particle, and not for example an insect, and a second criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly.
  • a third criterion will be passed for the value of the accumulated precipitation memorised in the microprocessor 44 to be increased accordingly if all three criteria are met, that increase is effected by the microprocessor 44.
  • the amount of the increase is indicated by the size of the drop in the signals received by the detectors 16 and 24.
  • the light sources 26 and 28 in the Figure 2 embodiment may be omitted, relying on the light sources 18 and 22 to make observations as regards the amount of light refracted and/or reflected by a particle or object within the detection zone 14 being sufficient to assist analysis of the nature of the particle or object in the microprocessor 44.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Atmospheric Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Ecology (AREA)
  • Environmental Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)
  • Fire-Detection Mechanisms (AREA)

Abstract

L'invention concerne un capteur de précipitation comprenant une première source de rayonnement électromagnétique et un détecteur de rayonnement électromagnétique. Ladite première source de rayonnement électromagnétique est orientée pour diriger un rayonnement électromagnétique vers le détecteur de rayonnement électromagnétique par l'intermédiaire d'une région de détection de chute libre de précipitation lorsque le capteur est en cours d'utilisation. Le capteur de précipitation comprend en outre au moins une autre source de rayonnement électromagnétique orientée pour diriger un rayonnement électromagnétique vers ladite région de détection de chute libre de précipitation le long d'une direction qui est à un angle de diffusion donné par rapport à la direction de la lumière provenant de ladite première source de rayonnement électromagnétique. L'invention concerne en outre un capteur de précipitation comprenant au moins deux sources de rayonnement électromagnétique orientées pour diriger un rayonnement électromagnétique vers des régions de détection de chute libre de précipitation respectives situées l'une au-dessus de l'autre lorsque le capteur est en cours d'utilisation, et au moins deux détecteurs de rayonnement électromagnétique respectifs situés chacun pour recevoir ledit rayonnement qui a été émis par la source de rayonnement électromagnétique associée et qui est entré dans la région de détection de chute libre de précipitation associée lorsque le capteur est en cours d'utilisation.
PCT/EP2017/025111 2016-06-30 2017-05-05 Capteur de précipitation Ceased WO2018001568A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB1611419.1 2016-06-30
GBGB1611419.1A GB201611419D0 (en) 2016-06-30 2016-06-30 A precipitation sensor

Publications (2)

Publication Number Publication Date
WO2018001568A2 true WO2018001568A2 (fr) 2018-01-04
WO2018001568A3 WO2018001568A3 (fr) 2018-02-22

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Application Number Title Priority Date Filing Date
PCT/EP2017/025111 Ceased WO2018001568A2 (fr) 2016-06-30 2017-05-05 Capteur de précipitation

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GB (1) GB201611419D0 (fr)
WO (1) WO2018001568A2 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108896457A (zh) * 2018-05-11 2018-11-27 冯瑞芳 一种粉尘防爆大气检测装置
RU219624U1 (ru) * 2023-05-29 2023-07-28 Общество с ограниченной ответственностью "Инжиниринг ПроСистемс" Датчик осадка

Citations (1)

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Publication number Priority date Publication date Assignee Title
US7122820B2 (en) 2001-04-25 2006-10-17 Vaisala Impulsphysik Gmbh Method for determining visibility, amount of precipitation and type of precipitation

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JPH1184024A (ja) * 1997-09-09 1999-03-26 Hitachi Cable Ltd 降雪センサ
JP2000275357A (ja) * 1999-03-23 2000-10-06 Nagoya Electric Works Co Ltd 降雨雪状況検出方法およびその装置
EP1389956B1 (fr) * 2001-04-25 2012-10-31 Amnis Corporation Procede et appareil de correction de la diaphonie et de la resolution spatiale de l'imagerie multicanal
US7633398B2 (en) * 2005-11-19 2009-12-15 Noonan Technologies, Llc Apparatus and method for measuring precipitation
US7847936B2 (en) * 2007-05-15 2010-12-07 Waters Technologies Corporation Evaporative light scattering device and methods of use thereof
JP5055476B2 (ja) * 2009-11-18 2012-10-24 シーシーエス株式会社 気象測定装置
KR101487745B1 (ko) * 2014-05-12 2015-01-29 다온 주식회사 광원과 카메라를 이용한 적설량 측정 장치.

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7122820B2 (en) 2001-04-25 2006-10-17 Vaisala Impulsphysik Gmbh Method for determining visibility, amount of precipitation and type of precipitation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108896457A (zh) * 2018-05-11 2018-11-27 冯瑞芳 一种粉尘防爆大气检测装置
CN108896457B (zh) * 2018-05-11 2020-12-08 博兴兴博投资有限公司 一种粉尘防爆大气检测装置
RU219624U1 (ru) * 2023-05-29 2023-07-28 Общество с ограниченной ответственностью "Инжиниринг ПроСистемс" Датчик осадка

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Publication number Publication date
WO2018001568A3 (fr) 2018-02-22
GB201611419D0 (en) 2016-08-17

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