CN114397272B - Method and device for detecting fuel gas components of engine - Google Patents
Method and device for detecting fuel gas components of engine Download PDFInfo
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- CN114397272B CN114397272B CN202111666122.0A CN202111666122A CN114397272B CN 114397272 B CN114397272 B CN 114397272B CN 202111666122 A CN202111666122 A CN 202111666122A CN 114397272 B CN114397272 B CN 114397272B
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 239000002737 fuel gas Substances 0.000 title claims description 30
- 239000013307 optical fiber Substances 0.000 claims abstract description 62
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 238000001514 detection method Methods 0.000 claims abstract description 47
- 230000008878 coupling Effects 0.000 claims abstract description 30
- 238000010168 coupling process Methods 0.000 claims abstract description 30
- 238000005859 coupling reaction Methods 0.000 claims abstract description 30
- 238000000862 absorption spectrum Methods 0.000 claims abstract description 15
- 230000003595 spectral effect Effects 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 14
- 239000007924 injection Substances 0.000 claims abstract description 14
- 230000000737 periodic effect Effects 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 13
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 52
- 238000012360 testing method Methods 0.000 claims description 15
- 238000001228 spectrum Methods 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 4
- 230000002708 enhancing effect Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 abstract description 10
- 238000002485 combustion reaction Methods 0.000 abstract description 10
- 230000035945 sensitivity Effects 0.000 abstract description 7
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 9
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 8
- 210000001520 comb Anatomy 0.000 description 7
- 238000005259 measurement Methods 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- 229910002092 carbon dioxide Inorganic materials 0.000 description 3
- 239000001569 carbon dioxide Substances 0.000 description 3
- 229910002090 carbon oxide Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001868 water Inorganic materials 0.000 description 3
- 239000000835 fiber Substances 0.000 description 2
- 238000005305 interferometry Methods 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical class [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 238000002835 absorbance Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004611 spectroscopical analysis Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2201/00—Features of devices classified in G01N21/00
- G01N2201/10—Scanning
- G01N2201/103—Scanning by mechanical motion of stage
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- Chemical & Material Sciences (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Optics & Photonics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method and a device for detecting the components of engine gas, comprising the following steps: the optical frequency comb system has repetition frequency of frequency deviation, scans and periodically coincides with and separates from each other in a time domain, and generates periodic interference signals; the optical fiber collimation device is positioned near the gas nozzle of the engine and is used for enabling the femtosecond laser pulse in the optical fiber to pass through the gas along the radial direction of the gas injection; the optical fiber coupling device is used for completing photoelectric conversion of the obtained periodic interference optical signals through the photoelectric detector; a signal conversion device which converts the time domain signal into a frequency domain signal; the data calculation device is used for obtaining the distribution of the detection section of the gas component by using the absorption spectrum data obtained at each circumferential angle through a CT data comprehensive calculation method, has the characteristics of high spectral resolution and high sensitivity, and can meet the real-time quantitative telemetry analysis requirement of the dynamic process of engine combustion.
Description
Technical Field
The invention relates to the technical field of laser spectrum measurement, in particular to a method and a device for detecting a fuel gas component of an engine.
Background
In an aerospace engine, measurement of state quantities such as gas components, concentration and the like in a high-temperature environment is very important for understanding the combustion condition inside the engine, and is also an important basis for optimizing combustion tissues and structures. The early design and the later optimization can be guided. The existing method for detecting the fuel gas components of the engine mainly adopts an inserted sampling analysis method and an incoherent infrared interference spectrometry method. The insertion sampling analysis needs to use a plurality of different analysis instruments, and each instrument has a single function. Secondly, the measurement time is long, and the quick test requirement of the dynamic combustion characteristic of the engine cannot be met. In addition, the sampling head is fixed in structure, so that uneven sampling distribution can be caused, and distributed detection of gas components is not facilitated.
Incoherent infrared interferometry spectral resolution is limited by the range of travel of the scanning arm in the interferometry. In terms of detection sensitivity, the irradiation intensity and energy density and radiation divergence of incoherent infrared light sources can restrict the sensitivity improvement. In terms of measuring speed, the measuring effectiveness is directly determined by the movement speed of the scanning arm in interference, and the requirement of quick measurement is difficult to meet.
Generally, the existing methods cannot meet the measurement requirements of high speed and high spectral resolution, both in terms of spectral index performance and detection speed.
Disclosure of Invention
The invention aims to provide a method and a device for detecting the components of engine gas, which have the characteristics of high spectral resolution and high sensitivity and can meet the real-time quantitative telemetry analysis requirement of the dynamic process of engine combustion.
An engine gas composition detection method comprises the following steps:
step A, constructing a test laser system;
step B, constructing an optical path of the test laser system;
step C, processing the spectral output of the test laser system;
step D, circumferentially scanning and detecting the spectrum data;
and E, axially scanning and detecting the spectrum data to obtain the spatial distribution of the injected fuel gas.
In one embodiment, the step a includes:
step A1, setting two optical frequency comb systems with frequency deviation repetition frequencies, wherein femtosecond laser pulses output by the optical frequency comb systems have different repetition periods;
and step A2, enhancing the phase coherence characteristic of the optical frequency comb system, and locking a certain frequency component of the optical frequency comb system to the ultra-stable laser.
In one embodiment, the step B includes:
step B1, the optical frequency comb system outputs femtosecond laser pulses to an optical fiber collimation device;
step B2, enabling the femtosecond laser pulse to penetrate through the fuel gas along the radial direction of the fuel gas injection cylindrical coordinate system;
and step B3, the optical fiber coupling device obtains a periodic interference signal.
In one embodiment, the step C includes:
step C1, the optical fiber coupling device sends an optical signal into a photoelectric detector to complete photoelectric conversion;
step C2, discretizing the electric signals by a data acquisition system;
and step C3, converting the time domain signal into a frequency domain signal through a Fourier transform algorithm, and completing spectrum detection.
In one embodiment, the step D includes:
step D1, the optical fiber collimation device and the optical fiber coupling device are scanned along the circumference to obtain absorption spectrum data under each circumferential angle;
and D2, obtaining the distribution of the detection section of the gas component through a CT data comprehensive calculation method.
In one embodiment, the step E includes:
e1, switching the axial coordinates of a detection surface along the gas injection axial direction of the engine;
and E2, repeating the circumferential scanning detection of the spectrum data to finish the axial scanning detection.
The engine gas component detection device comprises the engine gas component detection method, and further comprises the following steps:
the optical frequency comb system has repetition frequency of frequency deviation and is used for scanning, periodically overlapping and separating phenomena in a time domain to generate periodic interference signals;
the optical fiber collimation device is positioned near the gas nozzle of the engine, is connected with the optical frequency comb system through an optical fiber and is used for enabling the femtosecond laser pulse in the optical fiber to pass through the gas along the radial direction of gas injection;
the optical fiber coupling device is in signal connection with the optical fiber collimation device and is used for completing photoelectric conversion of the periodically obtained interference optical signals through the photoelectric detector;
the signal conversion device is in signal connection with the optical fiber coupling device and is used for converting the time domain signal into a frequency domain signal;
and the data calculation device is in signal connection with the optical fiber collimation device and the optical fiber coupling device and is used for obtaining the distribution of the detection section of the gas component by comprehensively calculating the absorption spectrum data under all the circumferential angles through CT data.
In one embodiment, the optical frequency comb system is two, and one frequency component of the optical frequency comb system is locked to the ultra-stable laser.
In one embodiment, the fiber optic coupling device discretizes the converted electrical signal by the data acquisition system.
The technical scheme has the following advantages or beneficial effects:
according to the method and the device for detecting the fuel gas components of the engine, the cylindrical space distribution of injected fuel gas is obtained through circumferential scanning detection and axial scanning detection; the method has the characteristics of high spectral resolution and high sensitivity, and can meet the real-time quantitative telemetry analysis requirement of the dynamic process of engine combustion. The invention improves the accuracy and precision of the laser emission signal and the receiving signal, and ensures the accuracy and precision of the analysis of the combustion chamber gas characteristics.
Drawings
FIG. 1 is a schematic flow chart of a method for detecting the components of engine fuel gas according to the present invention;
fig. 2 is a schematic structural view of an engine gas composition detecting device according to the present invention.
Detailed Description
In order that the above objects, features and advantages of the invention will be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
Referring to fig. 1, a method for detecting the components of fuel gas of an engine comprises the following steps:
step A, constructing a test laser system;
step B, constructing an optical path of the test laser system;
step C, processing the spectral output of the test laser system;
step D, circumferentially scanning and detecting the spectrum data;
and E, axially scanning and detecting the spectrum data to obtain the spatial distribution of the injected fuel gas.
Further, in a preferred embodiment of the method for detecting a gas component of an engine according to the present invention, the step a includes:
step A1, setting two optical frequency comb systems with frequency deviation repetition frequencies, wherein femtosecond laser pulses output by the optical frequency comb systems have different repetition periods;
and step A2, enhancing the phase coherence characteristic of the optical frequency comb system, and locking a certain frequency component of the optical frequency comb system to the ultra-stable laser.
Further, in a preferred embodiment of the method for detecting a fuel gas component of an engine according to the present invention, the step B includes:
step B1, the optical frequency comb system outputs femtosecond laser pulses to an optical fiber collimation device;
step B2, enabling the femtosecond laser pulse to penetrate through the fuel gas along the radial direction of the fuel gas injection cylindrical coordinate system;
and step B3, the optical fiber coupling device obtains a periodic interference signal.
Further, in a preferred embodiment of the method for detecting a gas component of an engine according to the present invention, the step C includes:
step C1, the optical fiber coupling device sends an optical signal into a photoelectric detector to complete photoelectric conversion;
step C2, discretizing the electric signals by a data acquisition system;
and step C3, converting the time domain signal into a frequency domain signal through a Fourier transform algorithm, and completing spectrum detection.
Further, in a preferred embodiment of the method for detecting a gas component of an engine according to the present invention, the step D includes:
step D1, the optical fiber collimation device and the optical fiber coupling device are scanned along the circumference to obtain absorption spectrum data under each circumferential angle;
and D2, obtaining the distribution of the detection section of the gas component through a CT data comprehensive calculation method.
Further, in a preferred embodiment of the method for detecting a gas component of an engine according to the present invention, the step E includes:
e1, switching the axial coordinates of a detection surface along the gas injection axial direction of the engine;
and E2, repeating the circumferential scanning detection of the spectrum data to finish the axial scanning detection.
The method comprises the steps of setting a small frequency deviation of the repetition frequency of two optical frequency comb systems by utilizing the two optical frequency comb systems, wherein at the moment, femtosecond laser pulses output by the two optical frequency combs have different repetition periods, and can mutually scan, overlap and separate the periods in a time domain to generate periodic interference signals;
the two optical frequency combs output femtosecond laser pulses, the femtosecond laser pulses are transmitted to an optical fiber collimation device near a gas nozzle of the engine through optical fibers, then the femtosecond laser pulses penetrate through the gas along the radial direction under a gas injection cylindrical coordinate system, and periodic interference signals are obtained by the optical fiber coupling device on the opposite side of the circumference;
the optical fiber coupling device sends the received optical signals to the photoelectric detector to complete photoelectric conversion, the converted electrical signals are discretized by the data acquisition system, and the time domain signals are converted into frequency domain signals by utilizing a Fourier transform algorithm to finally complete spectrum detection;
in a test run state of an engine, the frequency component of the femtosecond laser pulse is absorbed by carbon dioxide, water, carbon oxide and nitrogen oxide in the fuel gas, the optical fiber collimating device and the optical fiber coupling device are scanned along the circumference to obtain absorption spectrum data under various circumferential angles, and a CT data comprehensive calculation method is utilized to obtain the distribution of detection sections of the fuel gas components;
and switching the axial coordinates of the detection surface along the gas injection axial direction of the engine, repeating the circumferential scanning detection, and completing the axial scanning detection to obtain the cylindrical space distribution of the injected gas.
Referring to fig. 2, an engine gas component detecting device includes the above method for detecting an engine gas component, and further includes:
the optical frequency comb system 1 is provided with repetition frequencies with frequency deviation, is used for scanning, periodically overlapping and separating phenomena in a time domain, generating periodic interference signals, and setting the repetition frequencies of the two optical frequency comb systems to have tiny frequency deviation, wherein the femtosecond laser pulses output by the two optical frequency comb systems 1 have different repetition periods;
the optical fiber collimation device 2 is positioned near the engine gas nozzle and is connected with the optical fiber comb system 1 through an optical fiber, and is used for enabling the femtosecond laser pulse in the optical fiber to pass through the gas along the radial direction of gas injection, the two optical fiber comb systems 1 output the femtosecond laser pulse and transmit the femtosecond laser pulse to the optical fiber collimation device 2 near the engine gas nozzle through the optical fiber, and the optical fiber coupling device 3 obtains periodic interference signals on the opposite side of the circumference;
the optical fiber coupling device 3 is in signal connection with the optical fiber collimating device 2 and is used for completing photoelectric conversion of the periodically obtained interference optical signals through a photoelectric detector;
the signal conversion device 4 is in signal connection with the optical fiber coupling device 3 and is used for converting the time domain signal into the frequency domain signal through a Fourier transform algorithm;
the data computing device 5 is in signal connection with the optical fiber collimating device 2 and the optical fiber coupling device 3, and is used for obtaining the detection section distribution of the fuel gas component through a CT data comprehensive computing method by using the obtained absorption spectrum data under all the circumferential angles, and the frequency components of the femtosecond laser pulse are absorbed by carbon dioxide, water, carbon oxide and nitrogen oxide in the fuel gas in the engine test state, and the optical fiber collimating device 2 and the optical fiber coupling device 3 are scanned along the circumference to obtain the absorption spectrum data under all the circumferential angles.
Further, in a preferred embodiment of the device for detecting a gas component of an engine according to the present invention, two optical frequency comb systems 1 are provided, and a certain frequency component of the optical frequency comb systems 1 is locked to an ultrastable laser.
Further, in a preferred embodiment of the device for detecting a gas component of an engine according to the present invention, the optical fiber coupling device 3 discretizes the converted electrical signal by a data acquisition system.
Several aspects are fully considered in the spectral line selection of the absorption spectrum of gas molecules: 1. the intensity of the absorption spectrum line is large enough, so that the detection is convenient, and the distinction from the surrounding absorption spectrum lines is also convenient; 2. the absorption spectrum line is selected to avoid overlapping with the absorption spectrum lines of other gas molecules, so that the detection accuracy is improved; 3. the absorption line is chosen to correspond to the current laser and detection device.
In the embodiment, the concentration parameter of the gas is obtained through calculation according to Lambert-Beer law; firstly, measuring a light intensity signal after gas absorption and a laser original light intensity signal, and then calculating the actually measured spectral line intensity and line type according to the selected characteristic absorption line, so as to deduce the concentration of the gas. According to Lambert-Beer's law, if a beam of light passes through a medium at a certain environmental condition such as temperature and pressure of the medium, the absorbance of the medium to light is proportional to the product of the medium concentration and the medium thickness. Since part of the incident light intensity is absorbed by the medium, the intensity of the transmitted light passing through the medium is reduced, and the greater the concentration of the absorbing medium, the more pronounced the attenuation of the incident light.
The invention provides a method and a device for detecting the components of engine gas, which have the characteristics of high spectral resolution and high sensitivity and can meet the real-time quantitative telemetry analysis requirement of the dynamic process of engine combustion.
The method comprises the following specific steps:
first step, test laser system build
By using two optical frequency comb systems, the repetition frequency is set to have a tiny frequency deviation. At this time, the femtosecond laser pulses output by the two optical frequency combs have different repetition periods, and can scan, overlap and separate the periods in the time domain, so as to generate periodic interference signals. In order to enhance the phase coherence characteristic of the two optical frequency combs, ultra-stable laser is used as a frequency reference common to the two optical frequency combs, namely, a certain frequency component of each of the two optical frequency combs is locked to the ultra-stable laser.
Second, test light path construction
The two optical frequency combs output femtosecond laser pulses and are transmitted to an optical fiber collimating device near a gas nozzle of the engine through optical fibers. The femtosecond laser pulse then passes through the gas in the radial direction under the gas injection cylindrical coordinate system. On the opposite side of the circumference, the fiber optic coupling device obtains a periodic interference signal.
Third step, spectral output processing
The optical fiber coupling device sends the received optical signal to the photoelectric detector to complete photoelectric conversion. The converted electrical signals are discretized by a data acquisition system. And transforming the time domain signal into a frequency domain signal by utilizing a Fourier transform algorithm, and finally completing spectrum detection.
Fourth step, circumference scanning detection
In the engine test run state, the frequency component of the femtosecond laser pulse is absorbed by carbon dioxide, water and carbon oxides and nitrogen oxides in the fuel gas. The optical fiber collimation device and the optical fiber coupling device scan along the circumference to obtain the absorption spectrum data under each circumferential angle. The CT data comprehensive calculation method is utilized to obtain the distribution of the detection section of the gas component,
fifth step, axial scanning detection
And (3) switching the axial coordinates of the detection surface along the gas injection axial direction of the engine, and repeating the fourth step to finish axial scanning detection. Finally, the measuring step is completed, and the cylindrical space distribution of the injected fuel gas can be obtained.
In summary, according to the method and the device for detecting the fuel gas components of the engine, the cylindrical space distribution of injected fuel gas is obtained through circumferential scanning detection and axial scanning detection; the method has the characteristics of high spectral resolution and high sensitivity, and can meet the real-time quantitative telemetry analysis requirement of the dynamic process of engine combustion. The invention improves the accuracy and precision of the laser emission signal and the receiving signal, and ensures the accuracy and precision of the analysis of the combustion chamber gas characteristics.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations of the present invention, and are intended to be included in the scope of the present invention.
In the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "rear", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Claims (4)
1. The method for detecting the fuel gas components of the engine is characterized by comprising the following steps of:
step A, constructing a test laser system, wherein the step A comprises the following steps: step A1, setting two optical frequency comb systems with frequency deviation repetition frequencies, wherein femtosecond laser pulses output by the optical frequency comb systems have different repetition periods; step A2, enhancing the phase coherence characteristic of the optical frequency comb system, and locking a certain frequency component of the optical frequency comb system to the ultra-stable laser;
step B, constructing an optical path of the test laser system, wherein the step B comprises the following steps: step B1, the optical frequency comb system outputs femtosecond laser pulses to an optical fiber collimation device; step B2, enabling the femtosecond laser pulse to penetrate through the fuel gas along the radial direction of the fuel gas injection cylindrical coordinate system; step B3, the optical fiber coupling device obtains periodic interference signals;
step C of processing the spectral output of the test laser system, the step C comprising: step C1, the optical fiber coupling device sends an optical signal into a photoelectric detector to complete photoelectric conversion; step C2, discretizing the electric signal by a data acquisition system; step C3, converting the time domain signal into a frequency domain signal through a Fourier transform algorithm to finish spectrum detection;
step D, circumferentially scanning the detected spectral data, comprising: the optical fiber collimation device and the optical fiber coupling device are scanned along the circumference to obtain absorption spectrum data under each circumferential angle; acquiring the distribution of the detection section of the gas component by a CT data comprehensive calculation method;
and E, axially scanning and detecting the spectrum data to obtain the spatial distribution of the injected fuel gas, wherein the step comprises the following steps: switching the axial coordinate of the detection surface along the gas injection axial direction of the engine; and repeating the circumferential scanning detection of the spectrum data to finish the axial scanning detection.
2. An engine gas composition detection apparatus comprising an engine gas composition detection method as set forth in claim 1, further comprising:
the optical frequency comb system (1) has repetition frequency with frequency deviation and is used for scanning, periodically overlapping and separating phenomena in a time domain to generate periodic interference signals;
the optical fiber collimation device (2) is positioned near a fuel gas nozzle of the engine, is connected with the optical frequency comb system (1) through an optical fiber and is used for enabling femtosecond laser pulses in the optical fiber to pass through fuel gas along the radial direction of fuel gas injection;
the optical fiber coupling device (3) is in signal connection with the optical fiber collimating device (2) and is used for completing photoelectric conversion of the obtained periodic interference optical signals through the photoelectric detector;
a signal conversion device (4) in signal connection with the optical fiber coupling device (3) for converting a time domain signal into a frequency domain signal;
and the data calculation device (5) is in signal connection with the optical fiber collimation device (2) and the optical fiber coupling device (3) and is used for obtaining the distribution of the detection section of the gas component by using the obtained absorption spectrum data under all the circumferential angles through a CT data comprehensive calculation method.
3. An engine gas composition detection device according to claim 2, wherein the number of the optical frequency comb systems (1) is two, and a certain frequency component of the optical frequency comb systems (1) is locked to the ultra-stable laser.
4. An engine gas composition detection device as claimed in claim 2, wherein the optical fiber coupling means (3) discretizes the converted electrical signal by a data acquisition system.
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| CN111239075B (en) * | 2020-02-18 | 2022-10-11 | 华东师范大学重庆研究院 | Combustion field gas temperature and multi-component concentration measuring system based on self-adaptive optical fiber optical comb |
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| CN109270013A (en) * | 2018-11-28 | 2019-01-25 | 润电能源科学技术有限公司 | Multidimensional burning gas temperature and multicomponent concentration measuring method and system in a kind of furnace |
| CN110657992A (en) * | 2019-10-17 | 2020-01-07 | 北京航空航天大学 | Method for monitoring combustion field of aero-engine by space access type double-optical comb system |
| CN110736623A (en) * | 2019-10-17 | 2020-01-31 | 北京航空航天大学 | method for monitoring combustion field of aero-engine based on double-optical-comb all-fiber system |
| CN111077109A (en) * | 2020-01-16 | 2020-04-28 | 北京航空航天大学 | Temperature and concentration measuring system and method based on double-optical comb spectrum technology |
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