KR20170088218A - Device and Method for Gas Concentration Measurement using Infrared Sensors - Google Patents

Device and Method for Gas Concentration Measurement using Infrared Sensors Download PDF

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Publication number
KR20170088218A
KR20170088218A KR1020160008312A KR20160008312A KR20170088218A KR 20170088218 A KR20170088218 A KR 20170088218A KR 1020160008312 A KR1020160008312 A KR 1020160008312A KR 20160008312 A KR20160008312 A KR 20160008312A KR 20170088218 A KR20170088218 A KR 20170088218A
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South Korea
Prior art keywords
infrared
model
output signal
module
sensor
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KR1020160008312A
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Korean (ko)
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송성호
임윤태
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한림대학교 산학협력단
임윤태
주식회사 케이론
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Priority to KR1020160008312A priority Critical patent/KR20170088218A/en
Publication of KR20170088218A publication Critical patent/KR20170088218A/en

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    • 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
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
    • G01N23/2055—Analysing diffraction patterns
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0006—Calibrating gas analysers

Abstract

The present invention relates to a gas concentration measuring device and a method of using an infrared sensor which aims to provide a more precise gas concentration measuring device and method by providing a system and method of correcting an output signal of an infrared sensor where when measuring a gas concentration (e.g. carbon dioxide) of a certain component included in an air flow using an infrared light source and an infrared sensor; an output signal of the sensor is changed in accordance with changes of the surrounding environmental factors such as a temperature change of the sensor and the humidity change of air, and corrects the output signal in consideration with such changes of the surrounding environmental factors.

Description

Technical Field [0001] The present invention relates to an apparatus and method for measuring gas concentration using an infrared sensor,

Environmental and medical field through measurement of composition and concentration using absorption characteristic of each wavelength according to gas components using infrared light source and infrared sensor

Infrared light source and drive design technology, sensor technology to analyze components using infrared sensor, environmental and medical field application technology by measuring component and concentration using absorption characteristics by wavelength

The sensor output of the infrared sensor must always be constant for an infrared light source of a uniform intensity and a constant concentration of gas. However, when the internal temperature of the sensor or the ambient environment variable, such as humidity, changes, the output signal of the infrared sensor measured with respect to a uniform intensity infrared light source and a constant concentration of gas is not constant, Element. Therefore, if the output signal is not corrected properly, it may cause a wrong judgment and cause a serious problem. Therefore, it is necessary to acquire the non-uniform characteristics of the sensor and to obtain a correction technique for controlling the same. Further, in order to acquire the gas measurement data of the precise sensor, It is necessary to establish the accurate measurement model of the sensor based on the analysis.

In the present invention, a signal processing correction hardware device for sensor output signal correction is developed, a sensor model for various external environmental variables is established, a change in ambient environment variables (air temperature, humidity), a temperature of a sensor measurement circuit board, We propose a calibration algorithm that can guarantee the non-uniformity and the accuracy of temperature measurement based on the sensor model of the infrared sensor for various external environmental variables such as the temperature of the sensor itself.

The present invention relates to an apparatus and method for correcting an infrared sensor signal. In order to measure a gas concentration (for example, carbon dioxide or the like) of a specific component contained in a flow of a gas using an infrared light source and an infrared sensor, The output signal of the sensor is changed according to the change of the gas concentration of the gas sensor. It is an object of the present invention to provide an apparatus and method for correcting an infrared sensor output signal for ensuring the accuracy of gas concentration measurement.

An infrared ray sensor output signal correction apparatus for an infrared ray sensor according to the present invention includes: An infrared sensor module which transmits the gas to sense the infrared light reaching the sensor; An environmental parameter measuring module for measuring the internal temperature of the infrared sensor, the humidity of the gas, and the temperature of the surrounding air; An output signal correction and concentration detection module for calculating the concentration of the specific gas contained in the mixed gas by using the infrared sensor output signal obtained from the infrared sensor module and the temperature and humidity data acquired from the environmental parameter measurement module; A reference model parameter and a correction coefficient storage module of an infrared sensor output signal; A system control module for controlling the system; A display module for displaying density information; And a module for sending the measured concentration information to a main computer or a servo. The infrared sensor module is configured as an infrared sensor which reacts only with a specific component gas to be measured in a mixed gas. Generally, an infrared sensor having an optical filter having a constant wavelength range, based on the property of the component gas absorbing or transmitting to a light source of a specific wavelength band, ≪ / RTI >

(B) obtaining an infrared sensor output signal from an infrared sensor module; (c) measuring a sensor temperature from an environmental parameter measurement module; (D) correcting an infrared sensor output signal according to an environmental change based on an infrared sensor output signal model parameter and an output model stored in a correction coefficient storage module, (e) Calculating a concentration according to the signal, and (f) calculating and displaying the concentration.

A method for calculating a final measured concentration of a specific gas component in a mixed gas is a method of calculating a final measured concentration of a specific gas component in a mixed gas by using (d) an environmental parameter (sensor temperature, mixed gas humidity, etc.) measured in step (c) from an infrared sensor output signal obtained in step ), The infrared sensor output signal according to the environmental change is corrected based on the output model, and the concentration of the specific gas is detected in the step (e). The infrared sensor output signal model in step (d) generally takes the form of a linear function which takes the sensor output signal as an input and the gas concentration as an output, but it is replaced with a quadratic equation or a special nonlinear form according to sensor characteristics Can be used. In other words, the object of the present invention is to overcome the limitations of the prior art through a technique of automatically and precisely detecting the concentration of a specific gas in the mixed gas even in a change of the surrounding environment based on a mathematical model between the sensor output signal and the gas concentration .

In the infrared sensor module of the present invention, when the temperature of the sensor changes and the ambient temperature or humidity changes during measurement of the component concentration of the gas, the concentration measurement performance deteriorates or changes, do. The present invention relates to a system and an automatic correction algorithm for correcting degradation of the measurement performance of an infrared sensor with respect to changes in temperature or environmental parameters of the sensor, and systematically corrects the system based on a mathematical model So that it is possible to solve various difficulties in the measurement of the measurer.

The present invention is based on a mathematical model of a sensor signal from a technical point of view. The model includes a sensor change and a change in ambient environment variables, thereby automatically and consistently measuring the component concentration by a precise algorithm that takes into account such influence, The reliability and consistency of measurement data, the speed of measurement, and the automation of measurement can be achieved.

1 is a configuration diagram of an infrared ray measuring apparatus for measuring a gas concentration
2 is a flowchart of an infrared measurement method for gas concentration measurement
.

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an infrared ray measuring apparatus and method for measuring a gas concentration, and FIG. 1 shows a configuration of an infrared ray measuring apparatus for measuring a gas concentration. 1, the configuration of the apparatus is as follows.

An infrared sensor output signal correction apparatus includes an infrared light source module having a constant intensity; An infrared sensor module which transmits the gas to sense the infrared light reaching the sensor; An environmental parameter measuring module for measuring the internal temperature of the infrared sensor, the humidity of the gas, and the temperature of the surrounding air; An output signal correction module for calculating the concentration of the specific gas contained in the mixed gas by using the infrared sensor output signal obtained from the infrared sensor module and the temperature and humidity data acquired from the environmental parameter measurement module; A concentration detection module for calculating the gas concentration from the corrected infrared sensor output signal based on the reference model of the output signal; A display module for displaying density information; And a module for sending the measured concentration information to a main computer or a servo. That is, an infrared light source module 111 for providing an infrared light source of a constant intensity, an infrared sensor module 112 for generating an output signal by sensing the infrared light transmitted through the mixed gas from the infrared light source, An environmental parameter measurement module 113 for measuring a temperature change of the sensor and a surrounding environment and an infrared output signal measured by the infrared sensor module 112 using the environmental variable value measured by the environmental parameter measurement module 113 An output signal correction module 114 for correcting based on the infrared output signal model, a concentration detection module 115 for calculating the concentration of a specific component in the mixed gas based on the corrected infrared output signal, a display module (116), and a communication module (117) for sending the measured concentration information to a main computer or a servo.

The operation of the apparatus is such that the infrared light source module 111 projects infrared light of a predetermined intensity into a mixed gas containing a gas to be measured. In this case, the module is designed by configuring the circuit so that the power of the infrared light source can be adjusted, and the intensity information of the light source is provided to the correction module of the output signal and the density detection module. The infrared ray sensor module 112 includes an optical filter having a passband of a predetermined wavelength band for measuring infrared light belonging to the predetermined wavelength band, ) To generate an output signal proportional to the amount of infrared light transmitted through the mixed gas. Since the output signal of the infrared sensor is affected by the temperature change of the sensor itself and the change of the surrounding environment, the environment variable measuring module 113 measures the temperature change and the environmental change of the sensor itself, (114). The output signal correction module 114 corrects the output signal based on the environmental variable value provided by the environment variable measurement module 113 based on the input / output signal model of the infrared sensor. The gas concentration detection module 115 calculates the gas concentration using the infrared output signal thus corrected. The calculation of the gas concentration is obtained from a model equation of the relationship between the infrared output signal and the concentration, and the parameters of the model may be varied depending on the intensity of the light source. The measured concentration information is displayed on the display module 116, and the measured concentration information and the like are transmitted to the main computer or the server through the communication module 117 to be stored in a database or the like.

In the present invention, the output signal of the infrared sensor changes according to changes in the environmental factors such as the temperature change of the sensor itself, the temperature of the mixed gas, and the humidity. Therefore, a correction algorithm for the accurate gas concentration measurement is required. And is corrected by the mathematical input / output model relation between the infrared sensor output value and the gas concentration in the output signal correction module 114 and the density detection module 115 in consideration of the variable values measured by the environment variable measurement module 113. Concentration The mathematical input and output model relation using can be expressed as a linear equation between the infrared sensor output value and the gas concentration.

y = ax + b (1)

Where y is the gas concentration value, x is the infrared sensor output signal value, and a and b are the model coefficients. This model coefficient value changes in accordance with the change of environmental factors such as the temperature change of the sensor itself, the temperature of the mixed gas, and the humidity. In the present invention, the change amount of a and b is obtained in proportion to the change amount of the environmental variable Can be used. For example, if the temperature of the infrared sensor is T, the model parameters a and b given by equation (1) can be defined as follows.

a = a0 + a1 (T-T0), b = b0 + b1 (T-T0)

Here, a0 and b0 are model parameters at a reference temperature (for example, when the sensor temperature is 25 degrees Celsius per degree centigrade), and a1 and b1 are proportional coefficients for the sensor temperature change with respect to the reference temperature, respectively. The correction coefficients for the temperature and humidity of the mixed gas can be defined as shown in Equation (2), and the coefficients can be formed by including all of them. The output signal correction module 114 corrects the model coefficient of the sensor input / output model relation expression using the relational expression (2) as described above. Based on the corrected model coefficient, the density detection module 115 The gas concentration is accurately calculated and output.

FIG. 2 is a flowchart illustrating a method for measuring a gas concentration using an infrared sensor according to the present invention. The method includes the steps of setting an intensity and waveform of an infrared light source, acquiring an infrared sensor output signal using an infrared sensor, A step 214 of obtaining reference model coefficients a0 and b0 of equation (2) from the DB 213 storing the reference values of the model coefficients a and b corresponding to the reference environment given by the equations (1) and (2) A step 215 of extracting surrounding environmental data such as the temperature of the sensor, the mixed gas temperature and humidity, and the like, (Step 217) of obtaining an infrared input / output correction model given by equation (1) using the corrected model parameters, calculating and detecting an optimum gas concentration using the corrected infrared input / output correction model equation In step 218, A step 219 of displaying measurement concentration and measurement information based on the measured concentration values, and a step 220 of transmitting the measured concentration information to a computer or a server.

   In the infrared light source setting step 211 in the gas concentration measuring method, the waveform (DC, square wave, triangle wave, etc.) of the infrared light source and the intensity or power of the light source are determined for measuring the gas concentration so as to ensure optimal measurement performance . The reference temperature model coefficient DB 213 is a database for storing the reference values of the model coefficients a and b, that is, the values for a0 and b0 in equation (2) in the infrared sensor input / output model equation given by equation (1). In the model coefficient correction step 216, the model coefficient change value given by equation (2) is calculated based on the environmental variable value obtained in the surrounding environment data extraction step 215 and corrected. The correction model coefficient thus obtained is applied to a model equation given by equation (1) to obtain an output signal correction model (217), and the gas concentration value is calculated based on the correction model (218). The input / output model used for the measurement of the gas concentration in the present invention can be a linear equation or a higher order equation than a quadratic equation depending on the characteristics of the sensor. The coefficient correction equation assumed in equation (2) It is a linear equation proportional to the variation of the environmental variable. However, this coefficient modification formula can also be defined as a higher order equation of a quadratic equation or more of the variation of the environmental variable, and there is no need to limit it to a linear equation.

111: Infrared light source module providing an infrared light source of constant intensity
112: an infrared sensor module for generating an output signal by sensing an infrared ray transmitted through a mixed gas from an infrared light source
113: Environmental parameter measurement module that measures the temperature change of the sensor and the environmental change affecting the infrared output signal
114: an output signal correction module for correcting the measured infrared output signal based on the infrared output signal model
115: a concentration detecting module for calculating the concentration of a specific component in the mixed gas
116: display module for displaying gas concentration information
117: Communication module for sending the measured concentration information to the main computer or servo
211: Step of setting the intensity and waveform of the infrared light source
212: acquiring an infrared sensor output signal using an infrared sensor
213: Database DB that stores reference values of model coefficients a and b corresponding to the reference environment
214: step of acquiring the reference model coefficient
215: extracting surrounding environmental data such as the temperature of the sensor, the mixed gas temperature and humidity, and the like
216: Correction of model coefficients in the infrared input / output model
217: acquiring the infrared input / output correction model using the corrected model parameter
218: Detecting the gas concentration using the corrected infrared input / output correction model equation
219: displaying measurement concentration and measurement information based on the measured concentration values
220: transmitting the measured concentration information to a computer or a server

Claims (3)

An infrared light source module for providing an infrared light source of a constant intensity, an infrared sensor module for generating an output signal by sensing an infrared ray transmitted through a mixed gas from an infrared light source and a temperature sensor for influencing an infrared output signal, An output signal correction module for correcting the measured infrared output signal based on the infrared output signal model, a concentration detection module for calculating the concentration of the specific component in the mixed gas, A display module and a gas concentration measuring device including a communication module for sending measured concentration information to a main computer or a servo
The method of claim 1, further comprising: obtaining (214) a reference model coefficient in a database DB (213) for storing reference values of model coefficients a and b corresponding to a reference environment; A step 216 of correcting the model coefficient in the infrared input / output model in consideration of the environment change value extracted in the step 215 of extracting the data and a step 217 of obtaining the infrared input / output correction model using the corrected model variable And a step (218) of detecting the gas concentration using the obtained corrected infrared input / output correction model equation.
The method of claim 1, wherein the step of obtaining the infrared input / output correction model (217) extracts the corresponding infrared input / output correction model using the relational expression given by equation (1) and the correction formula by the environmental variable change given by equation (2) And a means for detecting the gas concentration by using the extracted infrared input / output correction model equation,
KR1020160008312A 2016-01-22 2016-01-22 Device and Method for Gas Concentration Measurement using Infrared Sensors KR20170088218A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108918454A (en) * 2018-09-30 2018-11-30 江苏七塔电力科技有限公司 Gas concentration detection apparatus and system
CN114324224A (en) * 2020-10-09 2022-04-12 旭化成微电子株式会社 Signal output device and concentration measurement system
KR20230065785A (en) * 2021-11-05 2023-05-12 한국건설기술연구원 LIDAR system for hydrogen and noxious gas
CN116380980A (en) * 2023-04-10 2023-07-04 哲弗智能系统（上海）有限公司 Method and device for determining gas concentration, electronic equipment and medium
US11827080B2 (en) 2019-09-18 2023-11-28 Carrier Corporation Heated gas detector

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108918454A (en) * 2018-09-30 2018-11-30 江苏七塔电力科技有限公司 Gas concentration detection apparatus and system
US11827080B2 (en) 2019-09-18 2023-11-28 Carrier Corporation Heated gas detector
CN114324224A (en) * 2020-10-09 2022-04-12 旭化成微电子株式会社 Signal output device and concentration measurement system
KR20230065785A (en) * 2021-11-05 2023-05-12 한국건설기술연구원 LIDAR system for hydrogen and noxious gas
CN116380980A (en) * 2023-04-10 2023-07-04 哲弗智能系统（上海）有限公司 Method and device for determining gas concentration, electronic equipment and medium

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