WO2019039955A1 - Tête de travail de minispectromètre à led - Google Patents

Tête de travail de minispectromètre à led Download PDF

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Publication number
WO2019039955A1
WO2019039955A1 PCT/RU2017/000618 RU2017000618W WO2019039955A1 WO 2019039955 A1 WO2019039955 A1 WO 2019039955A1 RU 2017000618 W RU2017000618 W RU 2017000618W WO 2019039955 A1 WO2019039955 A1 WO 2019039955A1
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WO
WIPO (PCT)
Prior art keywords
led
spectrometer
mini
radiation
photodiode
Prior art date
Application number
PCT/RU2017/000618
Other languages
English (en)
Russian (ru)
Inventor
Николай Деев СТОЯНОВ
Михаил Александрович ВЕЛИКОТНЫЙ
Original Assignee
Общество С Ограниченной Ответственностью "Микросенсор Технолоджи"
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 Общество С Ограниченной Ответственностью "Микросенсор Технолоджи" filed Critical Общество С Ограниченной Ответственностью "Микросенсор Технолоджи"
Priority to PCT/RU2017/000618 priority Critical patent/WO2019039955A1/fr
Publication of WO2019039955A1 publication Critical patent/WO2019039955A1/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
    • G01J3/02—Details
    • G01J3/10—Arrangements of light sources specially adapted for spectrometry or colorimetry
    • 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

Definitions

  • the present utility model generally relates to analyzers of the composition of substances, and in particular, to analyzers for determining the chemical composition of solids, particulate matter, or a combination thereof, operating in the spectral range of 900-2500 nm.
  • the closest analogue of the claimed utility model is a liquid and solid composition analyzer, known from the Eurasian application for invention No. 201600067, containing an optical unit with an LED emitter emitting in the spectral range of 900-2500 nm, and a broadband photodiode receiving radiation from the LED after interaction this radiation with the analyte.
  • the analyzer is capable of determining the chemical composition of the analyte in the form of a solid, a liquid substance, or a mixture of them in a wide spectral range, has small dimensions and low energy consumption.
  • the radiation from such a substance cannot always be properly obtained by a photodiode, since in practice the surface of the analyzed solid facing the analyzer can often be characterized by an uneven edge, for example, in the case where the solid is monolithic substance with an uneven surface or a non-monolithic substance composed of many solid parts that provide an uneven surface. Due to this uneven surface, the photodiode may not receive all the information about the solid substance being analyzed, and therefore, the radiation passing after interaction with the analyzed substance may not fully characterize the analyzed substance, i.e. in other words, errors or errors may be introduced into it.
  • the disadvantage of this device is the possibility of introducing errors or errors in the result of analysis of the composition of solids, which does not allow for the analysis of the chemical composition of solid materials with a sufficient degree of accuracy.
  • This utility model is aimed at solving this problem that occurs when using known devices, in the form of improving the accuracy of determining the chemical composition of solids, namely the accuracy of determining the chemical composition of solid monolithic or non-monolithic materials, as well as their combinations.
  • a working head of an LED mini-spectrometer for determining the chemical composition of the analyte, which is a solid monolithic or granular substance or a combination of them, comprising a head housing of an LED mini-spectrometer, in which a LED emitter and a broadband photodiode are mounted on a common board.
  • the LED emitter is configured to generate radiation in the range of 900-2500 nm and direct its radiation to the analyte.
  • the wideband photodiode is configured to receive radiation from the LED emitter after the interaction of this radiation with the analyte.
  • the LED emitter contains at least six LED chips mounted on the specified board in such a way that the LED chips are mounted circumferentially around the broadband photodiode.
  • the head of the LED mini-spectrometer is made in the shape of a hemisphere, so that the specified body has a spherical side, the inner surface of which is made mirror-like, and a flat side, and the broadband photodiode is located in the focus of the spherical side head housing LED mini-spectrometer.
  • the board, on which the LED chips and the photodiode are mounted, is a ring board located parallel to the flat side of the head housing of the LED mini-spectrometer.
  • the LED chips are located on the ring plate on its side facing the indicated flat side of the head housing, and the wideband photodiode is located on the opposite side of the ring board. At least four LED chips have emission spectrum peaks at different wavelengths.
  • Achievable technical result of this utility model is to improve the accuracy of determining the chemical composition of the analyte, which is a solid monolithic or granular substance or a combination of both, by performing the body of the proposed working head of the LED mini-spectrometer in the shape of a hemisphere with a spherical side, and the flat side, and in which the broadband photodiode is located in the focus of the indicated spherical side of the building usa.
  • the radiation from the LED emitter after its interaction with the analyte can be collected on a broadband photodiode, so that the radiation after interacting with all points of the analyzed solid on its surface facing the LED mini-spectrometer housing is directed on a broadband photodiode.
  • the possibility of errors and errors in determining the chemical composition of a solid substance is significantly reduced and eliminated, since the analysis takes into account information from essentially all points of the surface of the analyzed solid substance facing the head body.
  • the location of the photodiode in the focus of the mirror sphere ensures the collection of all the radiation in the working head generated by the LED emitter on the photodiode.
  • the board on which the LED chips and the photodiode are mounted in the form of a ring board installed parallel to the flat side of the head housing, so that the LED chips located on the ring board on its side facing the specified flat side of the head housing, and the wideband photodiode is located on the opposite side of the ring board, the optimal configuration of the components of the proposed working head is ensured to ensure the direction of radiation from the LED chips to the analyzed substance and further direction of this radiation after it interaction on the photodiode.
  • the annular circuit of the working head has an area made with the possibility of radiation from the LED chips passing through it after the interaction of this radiation with the substance being analyzed.
  • the ring board has cutouts that allow radiation from the LED chips to pass through them, and the broadband photodiode is located on the site formed by a portion of the ring board
  • the flat side of the housing of the head of the LED mini-spectrometer is at least partially made of glass that is transparent in the range of 900-2500 nm.
  • the head housing of the LED mini-spectrometer comprises protrusions for mounting in the LED mini-spectrometer.
  • a broadband photodiode is characterized by a red border of 2500 nm.
  • LED chips are made on the basis of heterostructures having a substrate containing GaSb, an active layer located above the substrate, containing a solid solution of GalnAsSb, a restrictive layer located above the active layer for localizing the main carriers, containing a solid solution AIGaAsSb, located above the bounding layer of the contact layer containing GaSb, and the buffer layer containing the solid solution GalnAsSb.
  • the buffer layer of the geochemical structures is located between the substrate and the active layer and contains indium less than the active layer.
  • the broadband photodiode is made on the basis of a heterostructure containing sequentially arranged substrate containing GaSb, an active layer containing GalnAsSb, electrical and optical confinement layers containing AIGaAsSb, and a contact layer containing GaSb.
  • FIG. 1 shows a side view of the working head of the LED mini-spectrometer according to the first embodiment of the present useful model, which schematically shows the internal components of the working head of the LED mini-spectrometer.
  • FIG. 2 shows a bottom view of the operating head of the LED mini-spectrometer shown in FIG. 1, which schematically shows the internal components of the working head of the LED mini-spectrometer.
  • the present description reveals the options and features of the working head of the LED mini-spectrometer for determining the chemical composition of the sample being analyzed in the form of a solid, a granular substance, or a combination of these. It should be noted that the disclosed features of the specified working head of the LED mini-spectrometer in any embodiment may be inherent in different variants of implementation in any combination thereof, unless otherwise specified.
  • sample Under the analyzed sample in the present description of the utility model refers to some of any solid monolithic or granular substances or their combinations, preferably used in agriculture, for example, but not as a limitation, grain, feed, peat, hay, bran, etc., which allows determine the chemical composition of any solid monolithic or bulk solids or combinations thereof.
  • sample can also be replaced by the term “analyte” and vice versa.
  • bulk solids are understood as a collection of small particles not adhered and not bonded to each other or partially bonded to each other, for example, such a collection of small particles can also be described as a crumbly or powdered substance.
  • a substance may be, for example, seeds of grain crops or seeds of plants of the legume family.
  • Powdered substances are substances that have the appearance of a powder.
  • a substance may be, for example, finely ground bran.
  • the working head is the main working element of the LED mini-spectrometer for determining the chemical composition of the analyte, which is a small portable device operating in the spectral range of 900-2500 nm based on the methods of optical spectroscopy.
  • the working head 100 of a light-emitting diode mini-spectrometer for determining the chemical composition of an analyzed sample according to the first embodiment of the present invention is illustrated by its side view in FIG. 1 and a bottom view in FIG. 2, which schematically shows the internal components of the working head 100 of a LED mini-spectrometer.
  • the working head 100 includes a head housing of an LED mini-spectrometer, in which a LED emitter is mounted on the board 30, which contains six LED chips 10 (only one LED chip is marked for simplicity in the drawings), and a broadband photodiode 20.
  • the used broadband photodiode 20 has a red border of 2500 nm, but it is possible to use photodiodes with an excellent red border.
  • the LED emitter is located in the housing of the head of the LED mini-spectrometer and is configured to emit in the range of 900-2500 nm.
  • the LED emitter is mounted on the board 30 in such a way that its radiation is directed to the analyte in the form of a sample located near the flat side 50 of the housing for the interaction of this radiation with the breakdown, and the broadband photodiode 20 is installed with the possibility of receiving radiation from the LED emitter after interacting radiation with a sample at its sensitive site.
  • the board 30, on which the LED chips 10 and the photodiode 20 are mounted, is an annular board installed parallel to the flat side 50 of the head housing of the LED mini-spectrometer.
  • the head of the LED mini-spectrometer is made in the shape of a hemisphere, so that the specified case has a spherical the side 40 and the flat side 50, and the wideband photodiode 20 is located in the focus of the spherical side 40 of the head housing of the LED mini-spectrometer.
  • the flat side 40 of the head housing of the LED mini-spectrometer is completely or partially made of glass that is transparent in the range of 900-2500 nm (sapphire, quartz, BaF 2 , CaF 2 ) to enable transmission radiation from the LED chips 10.
  • the LED chips 10 are located on the annular circuit board 30 on its side facing the flat side 50, and for the operation of the LED mini-spectrometer head near the flat side 50 it is necessary to ensure the presence of a sample.
  • the broadband photodiode 20 is located on the opposite side of the ring board 30.
  • the inner surface of the spherical side 40 of the head housing is mirrored, and the four LED chips of these six LED chips 10 have emission spectrum maxima at different wavelengths.
  • the annular circuit 30 of the working head has an area made with the possibility of passing through it radiation from the LED chips 10 after the interaction of this radiation with the sample, which is formed as a cutout in the annular circuit 30, so that the broadband photodiode 20 is located on the platform 25, which represents a section of the board 30 , which is illustrated in FIG. 2. It can be understood to a person skilled in the art that the indicated area of the ring board 30 can also be transparent or translucent portions that allow radiation from the LED chips to pass through them.
  • the working head 100 has protrusions 60 on the outer side of the hemispherical body, the shape of which allows the working head to be connected to other components of the LED mini-spectrometer.
  • a special device can be used as an LED mini-spectrometer, and in addition, for example, a mobile device, such as a mobile phone, smartphone, communicator, pocket computer, mobile computer such as a laptop or netbook, or another computing device.
  • the analyzed sample when determining its chemical composition by the working head is located outside the analyzer near the flat side 50 of the head housing.
  • the LED chips 10 are located on the annular circuit 30 on its side facing the analyte, and the broadband photodiode 20 is located on the opposite side of the annular circuit 30, which ensures optimal configuration of the components of the proposed working head to ensure the direction of radiation from the LED chips to the analyzed substance and the further direction of this radiation after its interaction on the photodiode.
  • the present utility model provides a technical result in the form of improving the accuracy of determining the chemical composition of the analyte by performing the body of the working head of the LED mini-spectrometer in the form of a hemisphere having a spherical side, the inner surface of which is made mirror and flat side, and in which the broadband photodiode is located the focus of the specified spherical side of the hull.
  • the location of the photodiode in the focus of the mirror sphere ensures the collection of all the radiation generated in the working head by the LED chips to the sensitive area of the photodiode.
  • LED chips of more than six and use of LED chips that are available, which may have emission spectrum maxima at different wavelengths, more than four.
  • the working head of the LED mini-spectrometer contains an LED emitter of 8 LEDs emitting at different wavelengths (1, 3, 1, 45, 1, 6, 1, 7, 1, 95, 2,15, 2, 25 and 2.35 ⁇ m), and a broadband photodiode with a red border of 2400 nm with a diameter of a sensitive area of 2 mm.
  • the working head of the LED mini-spectrometer contains a LED emitter of 12 LEDs, in which at least 4 LED chips emit at different wavelengths (1, 3, 1, 45, 1, 6, 1, 7 ⁇ m), and a broadband photodiode with a red border of 2300 nm with a diameter of a sensitive area of 2 mm.
  • the working head of the LED mini-spectrometer contains a LED emitter of 24 LEDs, in which at least 8 LED chips emit at different wavelengths (1, 3, 1, 45, 1, 6, 1, 7, 1, 95 , 2.15, 2.25 and 2.35 ⁇ m), and a broadband photodiode with a red border of 2400 nm with a diameter of a sensitive area of 2 mm.
  • the working head of the LED mini-spectrometer comprises an LED emitter of 32 LEDs, in which at least 12 LED chips emit at different wavelengths (1, 3, 1, 4, 1, 45, 1, 55, 1, 6, 1, 7, 1, 75, 1, 8, 1, 95, 2.15, 2.25 and 2.35 ⁇ m), and a broadband photodiode with a red border of 2500 nm with a sensitive area diameter of 2 mm.
  • a mini-spectrometer, in which the proposed working head can be used can exchange information with a mobile device or computing device in any known manner, including as an example a universal serial bus (USB), RS-232, RS-485, WiFi, Bluetooth or any other suitable compound. Additionally or alternatively, a mini-spectrometer, in which the proposed working head can be used, can have a memory (for example, non-volatile or volatile memory, such as flash memory, RAM, magnetic media, etc.) or can be configured to recording information on another machine-readable medium (for example, optical discs, etc.).
  • a memory for example, non-volatile or volatile memory, such as flash memory, RAM, magnetic media, etc.
  • another machine-readable medium for example, optical discs, etc.
  • the LED chips of the LED matrix can be made on the basis of heterostructures disclosed in the same applicant's patent EA 01830 with the title “Heterostructure Based on GalnAsSb Solid Solution, Method of Manufacturing, and LED Based on This Heterostructure”.
  • These heterostructures have a substrate containing GaSb, an active layer containing a GalnAsSb solid solution and located above the substrate, a restrictive layer for localizing the main carriers, containing an AIGaAsSb solid solution and located above the active layer, a contact layer containing GaSb and located above the restrictive layer, and a buffer layer containing a solid solution of GalnAsSb.
  • the buffer layer of the first heterostructure is a low-alloyed pO buffer layer with a composition close to GaSb, due to which the pO-GalnAsSb / n-GalnAsSb reverse-included pn junction provides hole localization in the active region near the heterojunction between the buffer layer and the active layer.
  • the growth of the pO-GalnAsSb layer which is structurally perfect with a minimum concentration of impurities and defects, minimizes the effect of defects growing from the substrate into the active region, which leads to a decrease in the deep acceptor levels and, accordingly, the fraction of Shockle-Reid-Hall nonradiative recombination.
  • the culture is grown with a low doping level of the pO buffer layer, i.e. a level close to its own concentration, a significant increase in quantum efficiency is obtained, and the direct operating voltage of such a heterostructure increases slightly, i.e. not several times, as is the case in thyristor-type structures.
  • lead is not used as a neutral solvent.
  • the buffer layer is located between the substrate and the active layer and contains less indium than the active layer.
  • the photodiode is made on the basis of a heterostructure, the manufacturing technology of which is described in the Eurasian patent Ne 018300 “Heterostructure based on the GalnAsSb solid solution, the method of its manufacture and the LED on the basis of this heterostructure” of the present applicant.
  • the specified heterostructure contains successively located substrate containing GaSb, the active layer containing GalnAsSb, the layers of electrical and optical limitations containing AIGaAsSb, and the contact layer containing GaSb.
  • the working head of the LED mini-spectrometer When determining the chemical composition of the analyzed sample using the working head of the LED mini-spectrometer according to any of the above options for implementation, first ensure the presence of the analyzed sample near the flat side of the housing of the working head of the LED mini-spectrometer, and then pulses are applied to the LED chips, so that their radiation interacts with a substance that is a component of the sample being analyzed, such as, for example, water, fat, glucose, mineral substances, etc. (partial absorption of radiation occurs, the intensity of which is proportional to the amount of such a substance, which is a component of the sample being analyzed) and is directed towards the broadband photodiode, which receives this radiation and generates the corresponding signals.
  • a substance that is a component of the sample being analyzed such as, for example, water, fat, glucose, mineral substances, etc.
  • the supply of pulses they are successively fed to individual LED chips with a shift in time.
  • the spectrum obtained from the signals generated by the photodiode and containing information on the absorption of light at a given wavelength can be compared with at least one known reference spectrum.
  • the concentration of substances in the sample being analyzed is determined.
  • the supply of pulses to the LED chips further comprises applying pulses to at least one pair of LED chips, the emission spectrum maxima of which are characterized by adjacent wavelengths, and when applying pulses to at least one pair of LED chips, pulses are simultaneously applied to each LED A chip of a specified pair of LED chips in such a way that each LED chip is switched on with a different power.
  • pulses are applied to the LED chips, the pulses are successively supplied to more than one pair of LED chips with a shift in time.
  • the pulsed power LEDs allows for a smooth scanning of the investigated range of 900-2500 nm, since the spectral radiation of the LED chips has the form of a Gaussian curve.
  • the spectral radiation of the LED chips has the form of a Gaussian curve.
  • This utility model is not limited to specific implementation options disclosed in the description for illustrative purposes, and covers all possible modifications and alternatives included in the scope of this utility model, a certain formula of the utility model.

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  • Physics & Mathematics (AREA)
  • 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)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

L'invention concerne une tête de travail de minispectromètre à LED servant à déterminer la composition chimique d'une substance à analyser consistant en une substance solide monolithique ou pulvérulente ou leur combinaison, laquelle comprend un corps de tête de minispectromètre à LED dans lequel sont disposés un émetteur LED et une photodiode à bande large agencés sur une plaque commune. L'émetteur LED peut générer un rayonnement dans une plage de 900-2500 nm et diriger son rayonnement vers la sustance à analyser. La photodiode à bande large peut recevoir un rayonnement de l'émetteur LED après interaction de ce rayonnement avec la sustance à analyser. L'émetteur LED comprend au moins six puces à LED montées sur ladite plaque de sorte que les puces à LED soient disposées sur la périphérie autour de la photodiode à bande large. Le corps de la tête du minispectromètre à LED a une forme hémisphérique de sorte que ledit corps possède un côté sphérique dont la surface interne est de type miroir, et un côté plan, et la photodiode à bande large est disposée sur le foyer du côté sphérique du corps de la tête du minispectromètre à LED. La plaque sur laquelle sont disposées les puces à LED et la photodiode consiste en une plaque annulaire disposée en parallèle au côté plan du corps de la tête du minispectromètre à LED. Les puces à LED sont disposées sur la plaque annulaire sur son côté orienté vers ledit côté plan du corps de la tête, et la photodiode à bande large est disposée sur le côté opposé de la plaque annulaire. Au moins quatre puces à LE possèdent des maxima de spectre de rayonnement à différentes longueurs d'onde.
PCT/RU2017/000618 2017-08-25 2017-08-25 Tête de travail de minispectromètre à led WO2019039955A1 (fr)

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PCT/RU2017/000618 WO2019039955A1 (fr) 2017-08-25 2017-08-25 Tête de travail de minispectromètre à led

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PCT/RU2017/000618 WO2019039955A1 (fr) 2017-08-25 2017-08-25 Tête de travail de minispectromètre à led

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1278049A1 (fr) * 2001-07-18 2003-01-22 CSEM Centre Suisse d'Electronique et de Microtechnique SA Module d'éclairage pour un spectromètre à réflexion
RU2487337C2 (ru) * 2009-03-30 2013-07-10 3М Инновейтив Пропертиз Компани Способ контроля вещества в атмосфере и устройство для его осуществления
WO2013148656A1 (fr) * 2012-03-27 2013-10-03 Innovative Science Tools, Inc. Analyseur optique pour identification de matériaux utilisant la spectroscopie par transmission
WO2017105273A1 (fr) * 2015-12-18 2017-06-22 Обществество С Ограниченной Ответственностью "Микросенсор Технолоджи" Analyseur de la composition de substances liquides ou solides

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1278049A1 (fr) * 2001-07-18 2003-01-22 CSEM Centre Suisse d'Electronique et de Microtechnique SA Module d'éclairage pour un spectromètre à réflexion
RU2487337C2 (ru) * 2009-03-30 2013-07-10 3М Инновейтив Пропертиз Компани Способ контроля вещества в атмосфере и устройство для его осуществления
WO2013148656A1 (fr) * 2012-03-27 2013-10-03 Innovative Science Tools, Inc. Analyseur optique pour identification de matériaux utilisant la spectroscopie par transmission
WO2017105273A1 (fr) * 2015-12-18 2017-06-22 Обществество С Ограниченной Ответственностью "Микросенсор Технолоджи" Analyseur de la composition de substances liquides ou solides

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