WO2013188914A1 - Capteur optique sensible à réponse rapide et procédé associé - Google Patents

Capteur optique sensible à réponse rapide et procédé associé Download PDF

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Publication number
WO2013188914A1
WO2013188914A1 PCT/AU2013/000653 AU2013000653W WO2013188914A1 WO 2013188914 A1 WO2013188914 A1 WO 2013188914A1 AU 2013000653 W AU2013000653 W AU 2013000653W WO 2013188914 A1 WO2013188914 A1 WO 2013188914A1
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WO
WIPO (PCT)
Prior art keywords
wavelength
optical
sampling
electromagnetic radiation
wavelengths
Prior art date
Application number
PCT/AU2013/000653
Other languages
English (en)
Inventor
Xiaoke Yi
Chao Lu
Robert Minasian
Chen Tong
Original Assignee
The University Of Sydney
Hong Kong Polytechnic University
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
Priority claimed from AU2012902626A external-priority patent/AU2012902626A0/en
Application filed by The University Of Sydney, Hong Kong Polytechnic University filed Critical The University Of Sydney
Publication of WO2013188914A1 publication Critical patent/WO2013188914A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G01J3/433—Modulation spectrometry; Derivative spectrometry
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/28—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source
    • G01J1/30—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors
    • G01J1/32—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using variation of intensity or distance of source using electric radiation detectors adapted for automatic variation of the measured or reference value
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J1/00—Photometry, e.g. photographic exposure meter
    • G01J1/10—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void
    • G01J1/20—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle
    • G01J1/34—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker
    • G01J1/36—Photometry, e.g. photographic exposure meter by comparison with reference light or electric value provisionally void intensity of the measured or reference value being varied to equalise their effects at the detectors, e.g. by varying incidence angle using separate light paths used alternately or sequentially, e.g. flicker using electric radiation detectors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0213—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using attenuators
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/02—Details
    • G01J3/0205—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows
    • G01J3/0232—Optical elements not provided otherwise, e.g. optical manifolds, diffusers, windows using shutters
    • 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
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

Definitions

  • the present invention relates to optical sensing of gases and liquids and, in particular, discloses a rapid and sensitive optical sensor capable of detecting different gaseous or liquid substances.
  • optical sampling system including: an electromagnetic radiation source for emitting electromagnetic radiation of at least a first and second wavelength; a sampling volume for projecting the electromagnetic radiation through; and an optical sensing unit for sensing the intensity level of the first and second wavelength after transmission through the sampling volume.
  • the RF modulating unit produces an out of phase difference between the modulated electromagnetic radiation.
  • the system preferably also includes a differencing unit for determining the difference in the intensity level of the sensed first and second wavelengths.
  • the system further includes an RF modulating unit for modulating the electromagnetic radiation of the electromagnetic radiation source before projection through the sampling volume.
  • a method of sampling to determine the presence or absence of an absorbing medium including the steps of: projecting at least a first and second wavelength signals thorough the absorbing medium with the first and second wavelengths having differing medium absorption characteristics; determining a difference in the relative absorption of the two wavelength signals within the medium; and utilizing the difference as a measure of the degree of absorbing medium present.
  • the first and second wavelength signals are RF modulated and the first and second wavelength signals are projected through the absorbing medium multiple times.
  • an optical sampling system including: an electromagnetic radiation source for emitting electromagnetic radiation of at least a first and second wavelength having a predetermined phase relationship; with the first wavelength having a first absorption characteristic to a sample medium and the second wavelength having a second absorption characteristic to the sample medium; a direction detection or an electro-optic modulator for combining and modulating the first and second wavelengths to produce modulated wavelength radiation; a sampling volume for projecting the modulated wavelength radiation through a sample medium to produce sample attenuated radiation; and an optical sensing unit for sensing the relative attenuation of at least the first wavelength relative to the second wavelength.
  • the optical sensing unit preferably can include a photodiode converting the sample attenuated radiation to a corresponding modulation level for modulating the electro-optic modulator.
  • the modulated wavelength radiation can be projected multiple times through the sampling medium to amplify the relative differences in the first and second absorption characteristics.
  • a method of optically sampling including the steps of: creating an optical signal including a first and second wavelength components having a predetermined phase relationship; mixing the first and second wavelength components and applying an RF frequency modulation to the mixed components to produce a first output signal; projecting the first output signal through a sampling chamber, wherein said first and second wavelength components have different absorption characteristics to a desired sample material; detecting the sampling chamber optical output of the sampling chamber; and determining a resultant intensity level profile of the sampling chamber optical output; and determining the relative absorption intensities of said first and said wavelength components from the RF modulated nature of the intensity level profile.
  • the first optical signal is looped through said sampling chamber multiple times.
  • FIG. 1 illustrates schematically a first optical sensor design of the preferred embodiments
  • FIG. 2 illustrates schematically a second modified optical sensor design of the present invention
  • Fig. 3 illustrates the RF responses for absorption at different wavelengths
  • Fig. 4 illustrates the overall differential response for the arrangement of Fig. 3.
  • FIG. 5 illustrates schematically a third modified optical sensor design of the present invention
  • FIG. 6 illustrates schematically a further arrangement of a modified sensor design
  • FIG. 7 illustrates schematically a further alternative arrangement having a multi wavelength source arrangement
  • FIG. 8 illustrates schematically a further alternative arrangement having a multi wavelength source arrangement
  • FIG. 9 illustrates schematically a further alternative arrangement having a broadband source arrangement
  • Fig. 10 illustrates schematically a further alternative arrangement having a broadband source arrangement
  • Fig. 11 illustrates schematically a three source wavelength embodiment
  • Fig. 12 illustrates schematically a three source wavelength embodiment.
  • an optical sensor for the rapid and accurate sensing of gases or fluids within an atmosphere or volume.
  • the preferred employment utilizes the interference between first and second lasers emitting selected wavelengths ⁇ and ⁇ 2.
  • the first wavelength ⁇ refers to an absorption wavelength with a second wavelength ⁇ 2 utilized as a reference wavelength.
  • the two wavelengths are projected through a gas sampling tube 7 and the resultant differences are analyzed.
  • Fig. 1 there is illustrated a schematic diagram 1 of the preferred embodiment.
  • two lasers 2, 3 emit wavelengths ⁇ , ⁇ 2.
  • the first wavelength ⁇ has a predetermined wavelength that is absorbent by the detectable medium.
  • the second wavelength ⁇ 2 is used as a non-absorbing reference wavelength.
  • the two wavelengths are input to an optical modulation scheme which provides RF signal modulation in an out of phase manner (i.e. with a 180° phase difference).
  • This can be achieved via a dual-input electro optical modulator 4 as shown in Figure 1 which introduces 180° RF phase difference between the modulated light at its dual input ports and which is also currently commercial available.
  • the electrooptic modulators available from
  • the out of phase modulation can also be achieved via other alternative ways such as using positive and negative slopes of two electro-optic intensity modulators or using cross gain modulations in semiconductor optical amplifiers.
  • the modulation output is forwarded to fast-speed switch 5.
  • Switch 5 acts in a clocked manner, initially switching its input A to output D. Subsequently, input B is switched to output D and then input B is switched to output C.
  • Optical switches with fast response time are commercially available.
  • the fiber optic switch from Agiltron has a response time (rise, fall) of 300ns.
  • the transition time of optical switches can be reduced to 30 to 50ns by using liquid-crystal cells (M. W. Geis, R. J. Molnar, G. W. Turner, T. M. Lyszczarz, R. M. Osgood, and B. R. Kimball (2010). 30 to 50 ns liquid-crystal optical switches.
  • an optical delay line in the loop provides optical time control which releases the switching time requirement of the optical switch.
  • the output D is forwarded via linear optical amplifier (LOA) 6 to a gas sampling tube 7, where the absorbent wavelength undergoes a degree of absorption depending on the density of absorbing gas within the chamber.
  • the non absorbent wavelength also traverses the gas sampling tube.
  • the linear optical amplifier 6 is inserted in the loop to compensate for component insertion loss and to keep loop gain at unity for, at least, the non-absorbent wavelength.
  • An optical delay line 8 can also be inserted in the loop to provide optical time control which releases the switching time requirement of the optical switch.
  • the RF signals modulated on the two wavelengths has a 180° phase difference at the output of the modulator, the detected frequency response of the two wavelengths has opposite RF phase after O/E conversion. This results in a subtraction or differential output at the photo-diode 9.
  • a target gas sample is presented in sampling tube 7.
  • the absorbed wavelength ⁇ experiences an extra attenuation due to gas absorption.
  • the reference wavelengths ⁇ 2 remains unaffected.
  • the loss offset between the two wavelengths is presented at the output photo diode 9 as a subtraction and a differential output is obtained, which is proportional to the amount of the gas present.
  • the dual wavelength parallel processing scheme of the preferred embodiment provides for reduce calibration requirements and is robust against environmental fluctuations.
  • both wavelengths of light are equally affected by the normal ambient changes, such as temperature, humidity or dust particles. This induces a small insertion loss. There will be minimal differential output obtained and the result from the subtraction remains stable. This allows for self compensation for any zero drift.
  • the switch 5 allows for the two wavelengths to continually circulate in the recirculating loop 6, 7, 8.
  • the switch 5 is used to control the number of loops that light travels inside the recirculating loop before of it is switched to the photo diode 9 via output port C.
  • the sensitivity of the sensor 1 is enhanced by repeatedly sampling in a short time period equivalent to the number of loops travelled inside the recirculating loop. This sampling can occur in a clocked manner. As an extra attenuation will be added to the absorbing wavelength ⁇ every time the light travels through the sampling tube inside the loop, the amount of attenuation will accumulate and enlarge the loss difference between ⁇ and ⁇ 2 before detection occurs by photodiode 9.
  • an optical coupler 14 is used to replace the optical switch in the loop.
  • Two optical light sources at optical wavelengths ⁇ 1 , ⁇ 2 11, 12 that carry RF signals with opposite phases are sent to an optical loop structure composed of an optical linear amplifier 15, a gas sampling tube 16, an optical delay line 17 and an optical coupler 14.
  • the first wavelength ⁇ has a predetermined wavelength that is absorbent by the detectable medium.
  • the second wavelength ⁇ 2 is used as a non-absorbing reference wavelength. These wavelengths are then sent to an all-optical loop structure that provides appropriate delays and weights for the positive taps and the negative taps.
  • the absorbed wavelength ⁇ experiences an extra attenuation due to gas absorption.
  • the reference wavelengths ⁇ 2 remains unaffected. Since a loss offset between the two wavelengths is presented, the two wavelengths in the amplified loop see slightly different loop gains. Therefore two independent bandpass responses with different filter coefficients are realized by circulating the two different wavelengths in the loop.
  • Fig. 3 shows the filter responses at different absorption at the two wavelengths which introduces the different loop gains. Since the frequency responses formed by the two modulated optical light sources have opposite phase, therefore they subtract each other at the photodetection.
  • the overall response is shown in Fig.4 where a high stopband attenuation is realized due to the subtraction of the two RF responses.
  • the extinction ratio of the overall RF response is defined as the RF power difference between the passband and the stopband which indicates the loss difference of the two optical wavelengths. The extinction ratio is a parameter to monitor the gas concentration level in the sampling tube.
  • the extinction ratio can be obtained by using different methods such as measuring the overall RF response via a network analyzer and then calculate the value difference of the peak and notch of the RF response, or modulating two RF signals locating at the bandpass and stopband frequencies on the two optical wavelengths and then measuring the RF power difference of the two RF signals after photodetection via a spectrum analyzer or RF power meter.
  • direction modulation and balanced detection schemes can be used to modulate the signals on the two wavelengths and to achieve differential output after photodection. This allows for no optical phase shift being required.
  • RF modulated signals are carried by two optical light sources at wavelengths ( ⁇ and ⁇ 2) via direction modulation.
  • the two lightwave signals are combined via an optical coupler and then forwarded to an optical loop structure including an optical switch 23, an optical linear amplifier 24, a gas sampling tube 25, and an optical delay line 26.
  • the optical loop performs the same optical function as shown in Fig. 1 and as described above.
  • the two optical sources continually circulate in the recirculation loop where the number of circulations within the loops can be controlled by using the optical switch 23.
  • An optical demultiplexer 27 is used at the output of the optical switch to separate the two optical signals into its frequency components at wavelength ⁇ and ⁇ 2, which are coupled to two separate photodiodes 28, 29.
  • a subtraction or a differential output is achieved in the electrical domain after optical to electrical conversion, which is proportional to the amount of gas presented.
  • FIG.2 can also be modified via introducing direction modulation and differential detection schemes as illustrated in Fig.5.
  • Fig. 7 and Fig. 8 illustrate schematically a multi wavelength source arrangement.
  • a multi- wavelength source consists two laser emission wavelengths 71, 72 which are fed into single input EOM 74 via an optical combiner 73, then the light at the each port of modulator output contains both wavelength ⁇ and 12. Due to the inverse polarity of the modulator output, the modulated light from two ports will have 180 degree phase difference.
  • Fig. 8 illustrates a similar arrangement to Fig. 7 wherein the optical coupler 78 is replaced by a switch 98, with the switch periodically switching between outputs C and D.
  • spectrum sliced optical source can also be used in the design.
  • a broadband spectrum sliced light source 111 is modulated 112 and then two optical narrowband filters centred at ⁇ and 12 are used 113, 114 at the dual outputs to generate required optical spectrum.
  • the broadband source 121 is spectrum sliced by using two optical slicing filters 122, 123, centred at ⁇ and 12.
  • the spectrum sliced source is modulated by using a dual input EOM 124 to introduce 180° RF phase difference between the modulated light.
  • the two wavelengths After circulating in the loop simultaneously, the two wavelengths generate two RF responses after photodetection. Due to the gas absorption effect, the two generated RF responses will be subtracted after photo-detection, and only the difference part will be remaining, which corresponds to the amount of loss due to gas absorption.
  • Fig. 11 illustrates a three wavelength system 130 that can be used to sense two different detectable media in one sampling tube.
  • three lasers emit wavelengths ⁇ , 12 and ⁇ 3.
  • the first wavelength ⁇ has a predetermined wavelength that is absorbent by the detectable medium 1.
  • the second wavelength 12 has a
  • the third wavelength ⁇ 3 is used as a non-absorbing reference wavelength.
  • the three wavelengths are input to an optical modulation scheme which provides RF signal modulation 132 in an out of phase manner (i.e. with a 180° phase difference).
  • This can be achieved via various ways.
  • a dual-input electro optical modulator is used in the design which introduces 180° RF phase difference between the modulated light at its dual input ports.
  • the absorbed wavelengths ⁇ and 12 experience an extra attenuation due to gas absorption, while the reference wavelength ⁇ 3 remains unaffected. After photodection, the RF responses at these three wavelengths can be obtained.
  • an optical switch 133 is used at the optical source part, to control the input wavelengths of the dual input EOM. This makes sure that only one absorbed- wavelength RF response presents at the photodetector along with the reference- wavelength RF response.
  • FIG. 12 An alternative arrangement is shown 140 in Fig. 12.
  • the two detectable media can be measured at the same time.
  • the two wavelengths ⁇ and 12 are combined 14 before being differentially modulated 142 with a reference wavelength ⁇ 3.
  • the wavelengths are circulated via switch 144 in gas sampling tube 143. Subsequently they are split 144 and filtered 144, 145.
  • the optical filters 144, 145 are used before the photodetection to separate the wavelengths into two groups, wherein one absorbed wavelength and one reference wavelength present in each group. Since the RF signals modulated on the two wavelengths (reference and absorbed wavelengths) has a 180° phase difference, the detected frequency response of the two wavelengths has opposite RF phase after photodection. This results in a differential output at the output of the photo-diode, which is inversely proportional to the amount of the gas present.
  • sampling tube can be replaced by immersion sensors so that the system is able to detect samples within compounds, such as liquids.
  • the number of wavelengths can be extended.
  • the extension can utilise different RF frequencies to drive each separate wavelength, and detect for multiple absorptions simultaneously.
  • the absorption characteristics of particular gases to each wavelength being utilized to detect corresponding concentrations in a post processing step.
  • the length of the optical delay line will be substantially inversely proportional to the switching speed required by the optical switch, in that a longer optical delay will allow for slower switching speeds.
  • Coupled when used in the claims, should not be interpreted as being limited to direct connections only.
  • the terms “coupled” and “connected,” along with their derivatives, may be used. It should be understood that these terms are not intended as synonyms for each other.
  • the scope of the expression a device A coupled to a device B should not be limited to devices or systems wherein an output of device A is directly connected to an input of device B. It means that there exists a path between an output of A and an input of B which may be a path including other devices or means.
  • Coupled may mean that two or more elements are either in direct physical or electrical contact, or that two or more elements are not in direct contact with each other but yet still co-operate or interact with each other.

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  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
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  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

La présente invention concerne un système optique d'échantillonnage comprenant : une source de rayonnement électromagnétique servant à émettre un rayonnement électromagnétique représentant au moins une première et une seconde longueur d'onde possédant une relation prédéterminée de phases, la première longueur d'onde présentant une première caractéristique d'absorption pour un milieu échantillon et la seconde longueur d'onde présentant une seconde caractéristique d'absorption pour le milieu échantillon ; un modulateur électro-optique servant à combiner et à moduler la première et la seconde longueur d'onde afin de produire un rayonnement à longueur d'onde modulée ; un volume d'échantillonnage servant à projeter le rayonnement à longueur d'onde modulée à travers un milieu échantillon afin de produire un rayonnement atténué par un échantillon ; et une unité de détection optique servant à détecter l'atténuation relative d'au moins la première longueur d'onde par rapport à la seconde longueur d'onde.
PCT/AU2013/000653 2012-06-21 2013-06-19 Capteur optique sensible à réponse rapide et procédé associé WO2013188914A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2012902626 2012-06-21
AU2012902626A AU2012902626A0 (en) 2012-06-21 Sensitive rapid response optical sensor and method

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WO2013188914A1 true WO2013188914A1 (fr) 2013-12-27

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Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016065428A1 (fr) * 2014-10-30 2016-05-06 The University Of Sydney Système et procédé d'accord optique
CN108548787A (zh) * 2018-04-11 2018-09-18 黑龙江工程学院 一种光谱仪精确测量硫化氢气体浓度的方法
CN108760653A (zh) * 2018-04-11 2018-11-06 黑龙江工程学院 一种光谱仪精确测量二氧化硫气体浓度的方法
US10180393B2 (en) 2016-04-20 2019-01-15 Cascade Technologies Holdings Limited Sample cell
CN109975222A (zh) * 2019-04-17 2019-07-05 四川万江一泓环境科技有限责任公司 全光谱水质检测自动校准及窗口清洗提醒系统
WO2019149776A1 (fr) * 2018-01-30 2019-08-08 Gottfried Wilhelm Leibniz Universität Hannover Procédé et dispositif pour la détermination d'une concentration
US10724945B2 (en) 2016-04-19 2020-07-28 Cascade Technologies Holdings Limited Laser detection system and method
US11519855B2 (en) 2017-01-19 2022-12-06 Emerson Process Management Limited Close-coupled analyser

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1237547A (en) * 1968-08-07 1971-06-30 Standard Telephones Cables Ltd Differential spectral absorption analyser
US3734631A (en) * 1971-05-28 1973-05-22 Hewlett Packard Co Nondispersive infrared gas analyzer employing solid state emitters and photodetectors
CA2108961A1 (fr) * 1992-07-06 1995-04-22 Charles Lucian Dumoulin Spectroscope imageur a detection pour ultrasons de l'absorption de radiations electromagnetiques modulees
WO2004113887A2 (fr) * 2003-06-20 2004-12-29 Aegis Semiconductor, Inc. Capteur infrarouge a bande etroite et a tres faible cout
UA82080C2 (uk) * 2005-06-22 2008-03-11 Национальный Аграрный Университет Спосіб визначення жиру в молоці та молочних продуктах

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1237547A (en) * 1968-08-07 1971-06-30 Standard Telephones Cables Ltd Differential spectral absorption analyser
US3734631A (en) * 1971-05-28 1973-05-22 Hewlett Packard Co Nondispersive infrared gas analyzer employing solid state emitters and photodetectors
CA2108961A1 (fr) * 1992-07-06 1995-04-22 Charles Lucian Dumoulin Spectroscope imageur a detection pour ultrasons de l'absorption de radiations electromagnetiques modulees
WO2004113887A2 (fr) * 2003-06-20 2004-12-29 Aegis Semiconductor, Inc. Capteur infrarouge a bande etroite et a tres faible cout
UA82080C2 (uk) * 2005-06-22 2008-03-11 Национальный Аграрный Университет Спосіб визначення жиру в молоці та молочних продуктах

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016065428A1 (fr) * 2014-10-30 2016-05-06 The University Of Sydney Système et procédé d'accord optique
US10724945B2 (en) 2016-04-19 2020-07-28 Cascade Technologies Holdings Limited Laser detection system and method
US10180393B2 (en) 2016-04-20 2019-01-15 Cascade Technologies Holdings Limited Sample cell
US11519855B2 (en) 2017-01-19 2022-12-06 Emerson Process Management Limited Close-coupled analyser
WO2019149776A1 (fr) * 2018-01-30 2019-08-08 Gottfried Wilhelm Leibniz Universität Hannover Procédé et dispositif pour la détermination d'une concentration
CN108548787A (zh) * 2018-04-11 2018-09-18 黑龙江工程学院 一种光谱仪精确测量硫化氢气体浓度的方法
CN108760653A (zh) * 2018-04-11 2018-11-06 黑龙江工程学院 一种光谱仪精确测量二氧化硫气体浓度的方法
CN108760653B (zh) * 2018-04-11 2020-11-17 黑龙江工程学院 一种光谱仪精确测量二氧化硫气体浓度的方法
CN109975222A (zh) * 2019-04-17 2019-07-05 四川万江一泓环境科技有限责任公司 全光谱水质检测自动校准及窗口清洗提醒系统
CN109975222B (zh) * 2019-04-17 2022-02-08 四川万江一泓环境科技有限责任公司 全光谱水质检测自动校准及窗口清洗提醒系统

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