CN111595817A - Device and method for detecting tail gas humidity of boarding machine - Google Patents
Device and method for detecting tail gas humidity of boarding machine Download PDFInfo
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- CN111595817A CN111595817A CN202010387288.8A CN202010387288A CN111595817A CN 111595817 A CN111595817 A CN 111595817A CN 202010387288 A CN202010387288 A CN 202010387288A CN 111595817 A CN111595817 A CN 111595817A
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- laser
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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
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06C—FINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
- D06C7/00—Heating or cooling textile fabrics
- D06C7/02—Setting
-
- 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
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
Abstract
The invention relates to a device and a method for detecting tail gas humidity of a boarding machine. Compared with the chemical measurement of zirconium dioxide, the method can not be influenced by the environment of chemical reaction and the chemical reaction, has no influence on the consumption of reactants, needs to replace the zirconium dioxide sensor probe every three years, has the advantages of high sensitivity, good selectivity, high response speed and the like, and can realize measurement with higher precision.
Description
Technical Field
The invention relates to the field of gas detection and boarding machine parameter detection prevention, in particular to a device and a method for detecting tail gas humidity of a textile boarding machine based on a TDLAS (laser tunable diode absorption spectroscopy) technology.
Background
The tail gas humidity of the textile setting machine is an important parameter for controlling the rotating speed of the setting machine, and has great significance for saving energy in the textile industry. At present, the humidity detection of a textile setting machine mainly adopts a zirconium dioxide sensor to react with oxygen atoms to detect the concentration of the oxygen atoms in gas to be detected, and then the concentration of water vapor is calculated.
However, oxygen is detected through oxygen atoms in a construction period, so that a large error exists in the detection of the water vapor concentration through zirconium dioxide, and meanwhile, the zirconium dioxide sensor is used for detecting the water vapor concentration according to a chemical reaction, so that loss is generated to the zirconium dioxide in the working process, so that a detection sensing probe is required to be replaced every three years in industrial practice, the cost of real-time online detection is increased, and the detection precision is low.
Disclosure of Invention
The invention aims to solve the problems that the detection precision is low and a detection sensing probe needs to be replaced regularly in the prior art, and provides a device and a method for detecting the tail gas humidity of a boarding machine based on a TDLAS technology.
In order to achieve the above object, the present invention has the following configurations:
the invention provides a tail gas humidity detection device of a boarding machine, which comprises a laser driving component, a laser beam splitter, a gas chamber to be detected, a first photoelectric sensor, a second photoelectric sensor, a first preamplification circuit, a first band-pass filter circuit, a second preamplification circuit, a second band-pass filter circuit and an upper computer, wherein the laser driving component is connected with the laser driving component;
laser drive assembly is used for the drive the laser instrument, the laser warp that the laser instrument sent divide into first laser and second laser behind the laser beam splitter, first laser gets into behind the standard air first photoelectric sensor, second laser warp get into behind the gas chamber that awaits measuring second photoelectric sensor, first photoelectric sensor's output warp first preamplification circuit and first band-pass filter circuit with the host computer is connected, second photoelectric sensor's output warp preamplification circuit and second band-pass filter circuit with the host computer is connected.
Optionally, the laser driving assembly includes a sawtooth generator, a second harmonic signal generator, a signal superposition circuit and a laser driver, signals emitted by the sawtooth generator and the second harmonic signal generator enter the laser driver after passing through the signal superposition circuit, and the laser driver drives the laser.
Optionally, an input end of the sawtooth wave generator and an input end of the second harmonic signal generator are respectively connected to the upper computer.
Optionally, the laser is a DFB laser.
Optionally, a temperature detection compensation module and a temperature sensor are arranged in the laser.
Optionally, the first laser beam enters the first photoelectric sensor through a first fourier lens after passing through standard air, and the second laser beam enters the second photoelectric sensor through a second fourier lens after passing through the gas chamber to be detected.
Optionally, laser collimators are respectively arranged between the laser and the laser beam splitter, between the laser beam splitter and the gas chamber to be measured, and between the laser beam splitter and the first fourier lens.
Optionally, the first fourier lens, the first photosensor, and the first fourier lens center of the laser collimator between the laser beam splitters is aligned with a same horizontal line, a first beam of laser vertically penetrates through standard air, the second fourier lens, the second photosensor, and the center of the laser collimator between the gas chamber to be measured and the laser beam splitters are aligned with a same horizontal line, and a second beam of laser vertically penetrates through the gas chamber to be measured.
The embodiment of the invention also provides a setting machine tail gas humidity detection method, which adopts the setting machine tail gas humidity detection device and comprises the following steps:
the laser driving component drives the laser to emit laser;
the laser is divided into a first laser beam and a second laser beam after passing through the laser beam splitter;
a first beam of laser enters a first photoelectric sensor after passing through standard air, and the first photoelectric sensor converts a received optical signal into an electric signal;
a second beam of laser enters a second photoelectric sensor after passing through the gas chamber to be detected, and the second photoelectric sensor converts the received optical signal into an electric signal;
the output electric signal of the first photoelectric sensor enters the upper computer after passing through the first preamplification circuit and the first band-pass filter circuit;
the output electric signal of the second photoelectric sensor enters the upper computer after passing through the second preamplification circuit and the second band-pass filter circuit;
and the upper computer performs inversion calculation on the received electric signal of the second photoelectric sensor to obtain the water vapor concentration of the gas to be detected, performs inversion calculation on the received electric signal of the first photoelectric sensor to obtain the water vapor concentration of the standard air, and subtracts the water vapor concentration of the standard air from the water vapor concentration of the gas to be detected to obtain a tail gas humidity detection result.
Therefore, compared with the traditional zirconium dioxide chemical method, the method has the advantages that the chemical reaction does not occur in the detection process, the sensor is not consumed, the common zirconium dioxide sensor probe needs to be replaced after being used for three years, the online detection can be realized compared with the microwave method, and the real-time performance and the rapidity are better. The invention can also be extended to high precision measurement of the humidity of the beam former.
Drawings
Fig. 1 is a schematic structural diagram of a device for detecting humidity of tail gas of a setting machine according to an embodiment of the present invention. (ii) a
FIG. 2 is a graph of absorption lines and a Voheter fit for water vapor around 7185 cm-1;
fig. 3 is a flowchart of a method for detecting humidity of tail gas of a boarding machine according to an embodiment of the present invention.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar structures, and thus their repetitive description will be omitted.
The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to provide a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In some instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the invention.
An adjustable semiconductor Laser absorption spectroscopy (TDLAS) is a gas detection technique based on the beer-lambert law, and a single absorption line of a gas to be detected is scanned by using wavelength tuning and narrow line width characteristics of a semiconductor Laser, so that quantitative analysis of the gas to be detected is realized. The tunable semiconductor laser absorption spectrum is used for gas concentration test, has the advantages of non-invasiveness, good selectivity, high measurement precision and high sensitivity, has high response speed, and can be used for real-time monitoring and data acquisition.
Direct Absorption Spectroscopy (DAS): the main measurement method belongs to tunable semiconductor laser absorption spectrum technology, and is characterized by that it uses low-frequency triangular wave or sawtooth wave current signal and high-frequency double-frequency modulation signal to implement scanning of wavelength near the absorption line, after the gas to be measured is absorbed, the voltage value outputted by detector can be reduced, and the gas concentration correspondent to the voltage signal can be fitted to obtain inversion formula of gas concentration to be measured, and the direct absorption method is applicable to absorption environment with strong absorption.
Direct digital frequency synthesis (DDS) is a synthesis technique that converts a set of signals in the form of digital quantities into output signals as analog quantities using a high-speed DAC. One of the most widely used DDS techniques is to look up a table in a high speed memory and then use a high speed DAC to output a sine wave that has been stored in digital form. The sinusoidal output DDS is one of the most widely used signal synthesis applications.
According to the requirement of the performance test of the tail gas humidity detection device of the textile setting machine, the direct absorption method is adopted as the measurement method of the tail gas humidity concentration measurement system of the textile industry setting machine. In this embodiment, the superposition of the sawtooth wave driving signal 2f and the sine wave high-frequency modulation signal adopts a direct digital frequency synthesis (DDS) technique.
The invention discloses a device and a method for detecting humidity of tail gas of a boarding machine based on TDLAS (tunable diode laser absorption Spectroscopy), which take humidity measurement of the tail gas of an industrial textile boarding machine as an application background. The laser wavelength emitted by the laser is controlled by a temperature feedback circuit of the DFB laser and a laser driving circuit superposed with sawtooth waves and high-frequency second harmonics to cover the absorption peak of water vapor in tail gas of the setting machine, the laser passes through a laser collimator, a 1:1 laser beam splitter and a laser collimator, one laser beam is introduced into gas to be measured, after the gas is absorbed, the light is converged by a Fourier lens and then subjected to photoelectric conversion by a photoelectric sensor to generate a weak current signal, the signal is amplified by a preamplification circuit and then transmitted to an upper computer after being filtered by a band-pass filter, the other laser beam is absorbed by air and then subjected to photoelectric conversion and then transmitted to the upper computer, and the upper computer reverses the concentration of the water vapor in the tail gas of the setting machine to be measured according to the Lanzel law of the absorbance of the tail gas of the setting machine to be measured, and the humidity of the tail gas of the boarding machine can be obtained.
Fig. 1 shows a schematic structural diagram of a device for detecting moisture in tail gas of a setting machine. The device comprises a sawtooth wave signal generator 2, a high-frequency second harmonic modulation signal generator 3, a signal superposition circuit 4, a Laser driver 5, a DFB (Distributed Feedback) Laser 6, a temperature compensation module 7, Laser collimators 7, 10 and 15, a Laser beam splitter 8, a gas chamber 10 to be measured, Fourier lenses 11 and 17, photoelectric sensors 12 and 18, preamplification circuits 13 and 19, band- pass filter circuits 14 and 20 and an upper computer 1. The gas to be detected is water vapor in tail gas of the industrial textile setting machine. The center of each of the DFB laser 6, the laser collimator 7 and the laser beam splitter 8 needs to be aligned on the same horizontal line, the cube laser beam splitter divides light emitted by a DFB laser light source into two beams in a ratio of 1:1, the centers of the laser collimator 9, the Fourier lens 11 and the photoelectric sensor 12 need to be aligned on the same horizontal line and ensure that one light path of the laser beam splitter 8 vertically passes through a gas chamber to be measured, and similarly, the centers of the laser collimator 15, the Fourier lens 17 and the photoelectric sensor 18 need to be aligned on the same horizontal line and ensure that the other light path of the laser beam splitter 8 vertically passes through background gas. The signal superposition circuit 4 is connected with the upper computer 1, and controls the D/A conversion chip to generate sawtooth wave and high-frequency sine wave signals through signals generated by the upper computer 1 and superposes the sawtooth wave signals and the high-frequency second harmonic signals. The laser driver 5 is connected to the signal superimposing circuit 4 for inputting a sawtooth scanning current into the DFB laser 6. The Fourier lenses 11 and 17 are additionally arranged in front of the photoelectric sensors 12 and 18 for focusing the light beams after the absorption of the gas on the photoelectric sensors 12 and 18, the photoelectric sensors 12 and 18 adopt avalanche photodiodes for converting optical signals into electric signals, and the photoelectric sensors are connected with the pre-amplification circuits 13 and 19 and the band- pass filter circuits 14 and 20 for ensuring the quality of the electric signals. The gas to be detected is the tail gas of the shaping machine, and is pumped into the closed gas chamber through the pumping pump so as to ensure the normal working environment of the laser. Before the gas to be measured is absorbed, the gas needs to be filtered to filter small smoke particles influencing the concentration of the tail gas and water vapor of the setting machine, and the temperature of the tail gas of the textile setting machine is about 200 ℃.
The DFB laser adopts NEL near infrared wavelength DFB of TT companyA semiconductor laser NLE1E5EAAA1360-1460 nm. The DFB laser is internally integrated with a Laser Diode (LD), a light power monitoring diode (PD), a temperature measuring element (thermistor) and a Thermocouple (TEC). When the measured gas to be measured is water vapor in the tail gas of the textile setting machine, the strongest absorption line is 7185.597cm-1. The DFB laser is used for emitting lasers with the wavelength of 1365nm, and the laser is provided with a temperature compensation module.
In the embodiment, a current driving control board of the LDC-0050 semiconductor laser of Donglong science and technology Limited is selected to adopt a proper power supply to provide stable and low-noise current for the semiconductor laser, and the current output range is 0-500 mA, and the modulation bandwidth is 0-100 KHz.
The sawtooth wave signal generator 2 and the high-frequency second harmonic wave signal generator 3 are connected with the signal superposition circuit 4 and used for inputting the low-frequency sawtooth wave scanning signal into the laser driver 5.
The temperature control module 7 is a temperature module packaged by the laser, and is connected with the laser to perform constant temperature control, wherein the constant temperature is preset.
The DFB laser 6 is used to emit near infrared light of 1365nm that is capable of covering the absorption line of water vapour gas in the exhaust gas of an industrial textile setting machine.
The light outlet of the DFB laser 6 is provided with a laser collimator 7, and the laser collimator 7 adopts a plano-convex lens added with a broadband antireflection film.
The photoelectric sensor 12 is connected with the preamplification circuit 13 and is used for measuring the outgoing of the light outlet of the gas absorption cell to be measured, measuring the laser intensity of the light beam, converting the laser intensity into a voltage signal, transmitting the voltage signal to the band-pass filter circuit after preamplification, and improving the waveform quality, wherein the outgoing measuring light beam is the light beam obtained after the incoming measuring light beam is absorbed by the gas absorption cell.
In the actual measurement process, in order to ensure the stability of the gas to be measured, high-purity nitrogen can be introduced into the gas absorption cell in advance. In addition, in order to ensure the absorption effect of the gas to be detected, the window sheets on the two sides of the light inlet and the light outlet of the gas absorption cell are made of barium fluoride materials.
The upper computer 1 is used for carrying out inversion calculation on the voltage signals subjected to the band-pass filtering to obtain the concentration and the change curve of the gas to be detected. The reference beam directly passes through the atmospheric environment to be used as background gas to reach the absorbance of the reference beam, and the absorbance is used for deducting the water vapor concentration in the air in the gas to be measured.
Compared with the measurement by the zirconium dioxide chemical method, the industrial textile setting machine based on the TDLAS provided by the embodiment of the invention is a gas humidity measurement system, can not be influenced by the environment of chemical reaction and the consumption of reactants, needs to replace a zirconium dioxide sensor probe every three years, has the advantages of high sensitivity, good selectivity, high response speed and the like, and can realize measurement with higher precision. The application range of the invention can also be expanded to the detection of the concentration of the vapor gas in other high-temperature environments.
As shown in fig. 3, an embodiment of the present invention further provides a TDLAS-based method for measuring humidity of exhaust gas of an industrial textile setting machine, which includes the following steps:
s1, the signal superposition circuit inputs the low-frequency sawtooth wave scanning signal superposed with the high-frequency second modulation harmonic into the laser driver;
s2, inputting low-frequency sawtooth wave scanning current to the DFB laser by the laser driver;
s3, the temperature control module controls the constant temperature of the DFB laser, wherein the constant temperature is preset;
s4, emitting near infrared light with the wavelength of 1365nm covering the absorption line of the gas to be detected by the DFB laser;
s5, dividing the near-infrared light beam into two beams by a laser beam splitter;
s6a, absorbing one beam by a gas chamber to be measured, transmitting the beam to the photoelectric sensor 1, and converting the optical signal into an electric signal;
s6b, absorbing the other beam by atmosphere, transmitting the other beam to the photoelectric sensor 2, and converting the optical signal into an electric signal;
and S7, amplifying and filtering the electric signal.
And S8, the upper computer performs inversion calculation on the obtained electric signal and deducts the water vapor concentration in the background atmosphere, so that the water vapor concentration and the change curve in the tail gas of the textile boarding machine are obtained.
Compared with the traditional zirconium dioxide chemical measurement method, the industrial textile boarding machine tail gas humidity measurement method provided by the embodiment of the invention is not influenced by background gas, and the sensor probe does not need to be replaced regularly due to the consumption of reactants caused by chemical reaction. The application range of the invention can also be expanded to other application backgrounds of high-temperature humidity water-gas concentration detection.
The TDLAS-based system and method for measuring humidity of exhaust gas from industrial textile setting machine provided by the present invention are introduced in detail, and specific examples are applied in the description to explain the principle and the implementation manner of the present invention, and the description of the above embodiments is only used to help understanding the method and the core idea of the present invention, and for those skilled in the art, there may be changes in the specific implementation manner and the application scope according to the idea of the present invention, and in summary, the content of the present description should not be understood as a limitation to the present invention.
It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include, or include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Therefore, the industrial textile setting machine based on the TDLAS provided by the embodiment of the invention is a gas humidity measurement system, compared with the zirconium dioxide chemical method, the industrial textile setting machine based on the TDLAS can not be influenced by the environment of chemical reaction and the chemical reaction, can not influence the consumption of reactants, needs to replace a zirconium dioxide sensor probe every three years, has the advantages of high sensitivity, good selectivity, high response speed and the like, and can realize measurement with higher precision. The application range of the invention can also be expanded to the detection of the concentration of the vapor gas in other high-temperature environments.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (9)
1. The device for detecting the humidity of the tail gas of the boarding machine is characterized by comprising a laser driving component, a laser beam splitter, a gas chamber to be detected, a first photoelectric sensor, a second photoelectric sensor, a first preamplification circuit, a first band-pass filter circuit, a second preamplification circuit, a second band-pass filter circuit and an upper computer;
laser drive assembly is used for the drive the laser instrument, the laser warp that the laser instrument sent divide into first laser and second laser behind the laser beam splitter, first laser gets into behind the standard air first photoelectric sensor, second laser warp get into behind the gas chamber that awaits measuring second photoelectric sensor, first photoelectric sensor's output warp first preamplification circuit and first band-pass filter circuit with the host computer is connected, second photoelectric sensor's output warp preamplification circuit and second band-pass filter circuit with the host computer is connected.
2. The setting machine exhaust gas humidity detection device according to claim 1, wherein the laser driving assembly comprises a sawtooth wave generator, a second harmonic signal generator, a signal superposition circuit and a laser driver, signals emitted by the sawtooth wave generator and the second harmonic signal generator enter the laser driver after passing through the signal superposition circuit, and the laser driver drives the laser.
3. The device for detecting the humidity of the tail gas of the setting machine as claimed in claim 2, wherein an input end of the sawtooth wave generator and an input end of the second harmonic signal generator are respectively connected with the upper computer.
4. The device for detecting the humidity of the exhaust gas of the setting machine as claimed in claim 1, wherein the laser is a DFB laser.
5. The device for detecting the humidity of the tail gas of the boarding machine as claimed in claim 1, wherein a temperature detection compensation module and a temperature sensor are arranged in the laser.
6. The device for detecting the humidity of the tail gas of the boarding machine as claimed in claim 1, wherein the first laser beam enters the first photoelectric sensor through a first Fourier lens after passing through standard air, and the second laser beam enters the second photoelectric sensor through a second Fourier lens after passing through the gas chamber to be detected.
7. The device for detecting the humidity of the tail gas of the boarding machine as claimed in claim 6, wherein laser collimators are respectively arranged between the laser and the laser beam splitter, between the laser beam splitter and the gas chamber to be detected, and between the laser beam splitter and the first Fourier lens.
8. The device for detecting the humidity of the exhaust gas of the boarding machine of claim 7, wherein the centers of the laser collimators among the laser beam splitters of the first Fourier lens, the first photoelectric sensor and the first Fourier lens are aligned with a same horizontal line, a first laser beam vertically penetrates through standard air, the centers of the laser collimators among the second Fourier lens, the second photoelectric sensor and the gas chamber to be tested and the laser beam splitters are aligned with a same horizontal line, and a second laser beam vertically penetrates through the gas chamber to be tested.
9. A method for detecting the humidity of tail gas of a setting machine is characterized in that the device for detecting the humidity of the tail gas of the setting machine as claimed in any one of claims 1 to 8 is adopted, and the method comprises the following steps:
the laser driving component drives the laser to emit laser;
the laser is divided into a first laser beam and a second laser beam after passing through the laser beam splitter;
a first beam of laser enters a first photoelectric sensor after passing through standard air, and the first photoelectric sensor converts a received optical signal into an electric signal;
a second beam of laser enters a second photoelectric sensor after passing through the gas chamber to be detected, and the second photoelectric sensor converts the received optical signal into an electric signal;
the output electric signal of the first photoelectric sensor enters the upper computer after passing through the first preamplification circuit and the first band-pass filter circuit;
the output electric signal of the second photoelectric sensor enters the upper computer after passing through the second preamplification circuit and the second band-pass filter circuit;
and the upper computer performs inversion calculation on the received electric signal of the second photoelectric sensor to obtain the water vapor concentration of the gas to be detected, performs inversion calculation on the received electric signal of the first photoelectric sensor to obtain the water vapor concentration of the standard air, and subtracts the water vapor concentration of the standard air from the water vapor concentration of the gas to be detected to obtain a tail gas humidity detection result.
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| CN202010387288.8A CN111595817A (en) | 2020-05-09 | 2020-05-09 | Device and method for detecting tail gas humidity of boarding machine |
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| CN202010387288.8A CN111595817A (en) | 2020-05-09 | 2020-05-09 | Device and method for detecting tail gas humidity of boarding machine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062314A (en) * | 2021-11-16 | 2022-02-18 | 浙江理工大学 | Photoelectric setting machine humidity detection device and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114062314A (en) * | 2021-11-16 | 2022-02-18 | 浙江理工大学 | Photoelectric setting machine humidity detection device and method |
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