CN117589689B - Temperature chromatography system and method based on double-optical comb-optical double-resonance spectrum technology - Google Patents
Temperature chromatography system and method based on double-optical comb-optical double-resonance spectrum technology Download PDFInfo
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Abstract
The invention discloses a temperature chromatography system and a method based on a double-optical comb-optical double-resonance spectrum technology, wherein the system comprises a double-optical comb light source module, a double-resonance chromatography temperature measurement module and a spectrum detection and analysis module; the double optical comb light source module consists of a signal optical comb light source, a local oscillator optical comb light source and a standard signal reference source; the dual-resonance chromatography temperature measurement module consists of a beam splitter, a nonlinear frequency converter, a time domain retarder and a high-temperature flow field detection area; the spectrum detection and analysis module consists of a photoelectric detection and data acquisition device and a data processing and analysis device; and recording the transition spectrum of the double resonance points of the high Wen Changou, realizing the detection, collection and analysis of the double optical comb spectrum, inverting the high-temperature field information of the double resonance points, and completing the change of the double resonance points by a time domain delayer. The invention can realize noninvasive measurement of temperature information of any point in the high Wen Liuchang, and has the advantages of high precision, high longitudinal spatial resolution and rapid longitudinal chromatography.
Description
Technical Field
The invention belongs to the field of precise spectrum and high Wen Cengxi, and particularly relates to a temperature chromatography system and method based on a double-optical comb-optical double-resonance spectrum technology.
Background
The combustion reaction occurring in the complex high Wen Liuchang is an important way for the industrialized society to obtain energy, and provides more than 80% of the production activities in the current society. In the face of extreme and severe changes in parameters such as temperature, pressure and material composition existing in the combustion process, scientists are devoted to diagnosing the high-temperature flow field, try to explore the basic rules of the combustion reaction, and provide guidance for improving the structure of the combustion chamber, developing domestic engines and the like. The traditional high Wen Liuchang detection means rely on invasive technologies such as parameter diagnosis, sampling analysis and the like of a temperature/pressure/flow rate sensor, have great interference on a combustion system, and are difficult to meet the measurement requirement of extremely high temperature, such as an aeroengine with the working temperature exceeding 2000K. The laser diagnosis technology has the technical advantages of non-invasiveness, high sensitivity, high speed, multi-parameter measurement and the like, becomes a main stream means of high Wen Liuchang diagnosis, and is even considered as an important technology for promoting the research and development of combustion mechanisms. The high Wen Liuchang diagnostic technique based on absorption spectrum uses lambert-beer law to measure the absorption spectrum of probe molecules on the path, and the line intensity formula S (T) can be expressed as follows:
；
Wherein, T 0 = 296K; h is the Planck constant; c is the speed of light; k is boltzmann constant; Energy for transition ground state; v 0 is the center frequency of the absorption line; q (T) is a partitioning function (direct absorption spectrum time division multiplexing technique double-line temperature measurement, J.laser, 2015,36 (08): 58-62). The line intensity formula S (T) shows that: the transition line intensity is not changed along with the self-properties of the spectral lines such as transition line type, spectral line width and the like, and is only affected by temperature. Thus, the integrated areas a 1 and a 2, which are obtained by integrating the two absorption lines, have a ratio that is temperature dependent only (a 1/A2=S1(T)/S2 (T)), and can be used to determine the gas temperature. The laser diagnosis technology based on the absorption spectrum can be directly used for inversion to obtain multidimensional information such as temperature, pressure, flow rate, component concentration and the like of the combustion field, and has the application advantages of low cost, easiness in miniaturization, high response speed, strong anti-interference capability and the like.
However, absorption spectroscopy measures the integrated signal on the laser path, and parameter analysis for each position on the path requires inversion reconstruction using an inverse Abbe transform algorithm. This technique has difficulty meeting the high spatial resolution combustion diagnostic requirements. For this reason, scientists have further developed a multi-beam optical path cross-measuring method for measuring the concentration and temperature distribution of a cross section by means of tomographic scanning (a flame temperature field measuring device and method CN11125749a; a three-dimensional combustion field temperature measuring method CN112082672a based on extinction correction time analysis), but cannot analyze the high temperature field distribution of a longitudinal section. Meanwhile, the scheme is mostly used for open combustion field measurement, cannot meet the combustion field diagnosis in a combustion chamber or an engine, is limited by the number of lasers and detectors, and has low spatial resolution. Therefore, there is a need in the combustion diagnostic arts to find high temperature flow field diagnostic schemes with high spatial resolution capability that meet the detection requirements of the industry and aerospace fields for high Wen Liuchang.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a temperature chromatography system and a method based on a double-optical comb-optical double-resonance spectrum technology.
The aim of the invention is realized by the following technical scheme: a temperature chromatography system based on dual optical comb-optical dual resonance spectroscopy, comprising: the device comprises a double-optical comb light source module, a double-resonance chromatography temperature measurement module and a spectrum detection and analysis module;
The dual-optical comb light source module is used for outputting a repetition frequency difference of A signal optical comb optical signal and a local oscillator optical comb optical signal;
The double-resonance chromatography temperature measurement module comprises a beam splitter, a nonlinear frequency converter, a time domain retarder and a high-temperature flow field detection area;
the beam splitter is used for dividing the signal optical comb optical signal into a first pump optical comb optical signal and a first detection optical comb optical signal;
the nonlinear frequency converter is used for carrying out nonlinear frequency conversion on the first pump light comb light signal and outputting a fifth pump light comb light signal so that the frequencies of the fifth pump light comb light signal and the first detection light comb light signal meet a double-resonance condition;
The time domain delayer is used for reflecting the fifth pump light comb light signal;
The high-temperature flow field detection area is used for transmitting the first detection optical comb optical signal, and outputting a third detection optical comb optical signal containing double-resonance transition spectral line information of the combustion product after loading an optical double-resonance transition spectrum excited by the combustion product through the reflected fifth pump optical comb optical signal and the transmitted first detection optical comb optical signal;
The spectrum detection and analysis module is used for combining the third detection optical comb optical signal and the local oscillation optical comb optical signal to output a combined optical signal, then digitizing the combined optical signal to obtain a digital signal, and performing time domain coherent averaging, fast Fourier transform, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
Further, the double optical comb light source module consists of a signal optical comb light source, a local oscillation optical comb light source and a standard signal reference source; the signal light comb light source is used for outputting a signal light comb light signal; the local oscillation optical comb light source is used for outputting local oscillation optical comb light signals; the standard signal reference source is used for setting the repetition frequency difference as。
Further, the beam splitter consists of a first half-wave plate and a polarization beam splitting prism; the first half wave plate is used for changing the polarization state of the signal light comb optical signals, and the polarization beam splitter prism is used for dividing the signal light comb optical signals with the changed polarization state into first pump light comb optical signals and first detection light comb optical signals; adjusting the power ratio of the first pump light comb light signal to the first probe light comb light signal by rotating the angle of the first half wave plate; the first pump light comb light signal is input to a nonlinear frequency converter; the first detection light comb light signal is input to a high Wen Liuchang detection area, and the beam splitter consists of a first half-wave plate and a polarization beam splitting prism; the first half wave plate is used for changing the polarization state of the signal light comb optical signals, and the polarization beam splitter prism is used for dividing the signal light comb optical signals with the changed polarization state into first pump light comb optical signals and first detection light comb optical signals; adjusting the power ratio of the first pump light comb light signal to the first probe light comb light signal by rotating the angle of the first half wave plate; the first pump light comb light signal is input to a nonlinear frequency converter; the first detection optical comb optical signal is input to a high Wen Liuchang detection area.
Further, the nonlinear frequency converter consists of a second half wave plate, a first plano-convex lens, a nonlinear crystal and a second plano-convex lens; the second half wave plate is used for adjusting the polarization state of the first pump light comb light signal to meet the phase matching condition of the nonlinear crystal and outputting a second pump light comb light signal; the first plano-convex lens is used for focusing the second pump light comb light signal and outputting a third pump light comb light signal; the nonlinear crystal is used for carrying out nonlinear frequency conversion on the third pump light comb light signal and outputting a fourth pump light comb light signal; the second plano-convex lens is used for collimating the fourth pump light comb light signal, outputting a fifth pump light comb light signal and inputting the fifth pump light comb light signal to the time domain delayer.
Further, the time domain retarder consists of a mechanical displacement platform, a return mirror and a first reflecting mirror, wherein the return mirror and the first reflecting mirror are fixed on the mechanical displacement platform; the return mirror is used for carrying out delay reflection on the input fifth pump light comb light signal and inputting the fifth pump light comb light signal to the first reflecting mirror; the first reflecting mirror is used for reflecting the fifth pump light comb light signal and inputting the fifth pump light comb light signal to the high Wen Liuchang detection area; the mechanical displacement platform is used for adjusting the time delay of the fifth pump light comb light signal.
Further, the high-temperature flow field detection area consists of a filter, a second reflecting mirror, a dichroic mirror and a high-temperature combustion area; the filter transmits the input first detection optical comb optical signals and outputs second detection optical comb optical signals; the second reflecting mirror is used for reflecting a second detection light comb light signal and inputting the second detection light comb light signal into the high-temperature combustion area; the input fifth pump light comb light signal is reflected by the dichroic mirror and is input into the high-temperature combustion area; when the reflected fifth pumping light comb light signal and the reflected second detection light comb light signal are overlapped in the high-temperature combustion area, after an optical double-resonance transition spectrum excited by combustion products in the high-temperature combustion area is loaded, outputting a third detection light comb light signal and a residual fifth pumping light comb light signal; the third detection light comb light signal is transmitted by the dichroic mirror and then is input to the spectrum detection and analysis module; the residual fifth pump light comb light signal is input to the second reflecting mirror, is filtered by the filter after being reflected by the second reflecting mirror, and is prevented from interfering the light path.
Further, the spectrum detection and analysis module consists of a photoelectric detection and data acquisition device and a data processing and analysis device;
The photoelectric detection and data acquisition device consists of a third reflecting mirror, a beam combining sheet and a photoelectric detector; the third reflecting mirror is used for reflecting the input third detection optical comb optical signals; the beam combining sheet is used for combining the reflected third detection optical comb optical signal and the local oscillation optical comb optical signal, outputting a combined optical signal and inputting the combined optical signal to the photoelectric detector; the photoelectric detector is used for receiving the combined light signals, generating double-optical comb interference signals and inputting the double-optical comb interference signals to the data processing and analyzing device;
The data processing and analyzing device consists of a data acquisition card and an electronic computer; the data acquisition card digitizes the input double optical comb interference signals to obtain digital signals and transmits the digital signals to the electronic computer; the electronic computer is used for carrying out time domain coherent averaging, fast Fourier transformation, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signals to obtain high-temperature combustion field information, and is used for controlling the mechanical displacement platform to adjust the stepping fixed length of the mechanical displacement platform for changing the time delay of the fifth pumping optical comb optical signals, so that the double resonance points traverse the high-temperature flow field, and high Wen Liuchang chromatography is completed.
The invention also provides a temperature chromatography method based on the double-optical comb-optical double-resonance spectrum technology, which comprises the following steps:
(1) The output repetition frequency difference of the double-optical comb light source module is The signal optical comb optical signals and the local oscillation optical comb optical signals are transmitted to the double-resonance chromatography temperature measurement module, and the local oscillation optical comb optical signals are transmitted to the spectrum detection and analysis module;
(2) The double-resonance chromatography temperature measurement module comprises a beam splitter, a nonlinear frequency converter, a time domain retarder and a high-temperature flow field detection area;
The beam splitter divides the signal optical comb optical signals into first pump optical comb optical signals and first detection optical comb optical signals, the first pump optical comb optical signals are transmitted to the nonlinear frequency converter, and the first detection optical comb optical signals are transmitted to the high Wen Liuchang detection area;
the nonlinear frequency converter carries out nonlinear frequency conversion on the first pump light comb light signal and outputs a fifth pump light comb light signal, so that the frequencies of the fifth pump light comb light signal and the first detection light comb light signal meet the double resonance condition;
The time domain delayer reflects the fifth pump light comb light signal;
The high-temperature flow field detection area transmits the first detection optical comb optical signal, loads an optical double-resonance transition spectrum excited by a combustion product through the reflected fifth pumping optical comb optical signal and the transmitted first detection optical comb optical signal, outputs a third detection optical comb optical signal containing double-resonance transition spectral line information of the combustion product, and transmits the third detection optical comb optical signal to the spectrum detection and analysis module;
(3) The spectrum detection and analysis module performs beam combination on the third detection optical comb optical signal and the local oscillation optical comb optical signal to output a combined optical signal, then digitizes the combined optical signal to obtain a digital signal, and performs time domain coherent averaging, fast Fourier transform, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
The invention also provides a temperature chromatography device based on the double-optical comb-optical double-resonance spectrum technology, which comprises one or more processors and is used for realizing the temperature chromatography method based on the double-optical comb-optical double-resonance spectrum technology.
The present invention also provides a computer readable storage medium having stored thereon a program which, when executed by a processor, is adapted to implement the above-described temperature tomography method based on dual optical comb-optical dual resonance spectroscopy.
The beneficial effects of the invention are as follows:
(1) The double-optical comb-optical double-resonance spectrum detection system provided by the invention can solve the problem of light path integration which is difficult to avoid by the traditional laser temperature measurement technology, only detects the spectrum information of double resonance points in an optical path, and can realize high Wen Liuchang distribution chromatography of the whole longitudinal space light path by adjusting time delay;
(2) The ultra-short pulse optical comb light source system used in the invention has the pulse time domain width of hundreds or even tens of femtoseconds, the space duration length of micron order, and can realize high-temperature field chromatography measurement with micron order and high spatial resolution;
(3) The double-optical comb light source used by the invention has the characteristics of high frequency precision and broadband spectrum, the direct output spectrum can cover the whole vibration transition band, stable optical double-resonance transition can be excited without any additional locking, and the requirements of continuous measurement and long-time monitoring of a complex combustion field can be met.
Drawings
FIG. 1 is a block diagram of a temperature chromatography system based on a dual optical comb-optical dual resonance spectroscopy technique in example 1;
FIG. 2 is a schematic diagram of a dual optical comb-optical dual resonance process;
FIG. 3 is a block diagram of a temperature chromatography system based on a dual optical comb-optical dual resonance spectroscopy technique in example 2;
FIG. 4 is a flow chart of a temperature chromatography method based on the dual optical comb-optical dual resonance spectroscopy technique in example 3;
FIG. 5 is a block diagram of a temperature chromatography system based on the dual optical comb-optical dual resonance spectroscopy technique in example 5;
In the figure, a 1-double optical comb light source module; 2-a double-resonance chromatography temperature measurement module; 3-a spectrum detection and analysis module; 11-a signal light comb light source; 12-a local oscillator optical comb light source; 13-a standard signal reference source; 21-a beam splitter; 22-nonlinear frequency converter; a 23-time domain delayer; 24-a high temperature flow field detection zone; 31-a spectrum detection and acquisition device; 32-a data processing and analyzing device; 211-a first half-wave plate; 212-a polarization beam splitting prism; 221-a second half wave plate; 222-a first plano-convex lens; 223-nonlinear crystal; 224-a second plano-convex lens; 223-nonlinear crystal; 224-a second plano-convex lens; 231-return mirror; 232-a mechanical displacement platform; 233-a first mirror; 241-a filter; 242-a second mirror; 243-dichroic mirrors; 244—a high temperature combustion zone; 311-a third mirror; 312-beam combining sheets; 313-photodetectors; 321-a data acquisition card; 322-electronic computer.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings and examples, it being understood that the specific examples described herein are for the purpose of illustrating the present invention only, and not all the examples. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are within the scope of the present invention.
Example 1: as shown in FIG. 1, the invention provides a temperature chromatography system based on a double-optical comb-optical double-resonance spectrum technology, which comprises a double-optical comb light source module 1, a double-resonance chromatography temperature measurement module 2 and a spectrum detection and analysis module 3.
The dual-optical comb light source module 1 is configured to output a repetition frequency difference ofThe signal optical comb optical signal and the local oscillator optical comb optical signal.
The dual resonance tomography temperature measurement module 2 comprises a beam splitter 21, a nonlinear frequency converter 22, a time domain retarder 23 and a high Wen Liuchang detection zone 24.
The beam splitter 21 is configured to split the signal optical comb optical signal into a first pump optical comb optical signal and a first probe optical comb optical signal.
The nonlinear frequency converter 22 is configured to perform nonlinear frequency conversion on the first pump light comb signal, and output a fifth pump light comb signal, so that frequencies of the fifth pump light comb signal and the first probe light comb signal satisfy a dual resonance condition to excite dual resonance transitions of combustion products.
The time domain retarder 23 is configured to reflect the fifth pump optical comb signal.
The high temperature flow field detection area 24 is configured to transmit the first detection optical comb optical signal, load an optical dual resonance transition spectrum excited by a combustion product by using the reflected fifth pump optical comb optical signal and the transmitted first detection optical comb optical signal, and output a third detection optical comb optical signal containing dual resonance transition spectrum information of the combustion product, which may be used to invert the resonance point high temperature flow field information.
The spectrum detection and analysis module 3 is configured to combine the third detection optical comb signal and the local oscillator optical comb signal, output a combined optical signal, digitize the combined optical signal to obtain a digital signal, and perform time domain coherent averaging, fast fourier transform, optical frequency domain restoration, spectral line fitting and analysis on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
As shown in fig. 2, the principle of a double optical comb-optical double resonance process based on the CO 2 vibration level structure is given, which can be expressed specifically as: the CO 2 molecule has three vibrational levels, namely a ground state 00001, a first excited state 00021, and a second excited state 00031, wherein the vibrational level transitions (00021) - (00001) resonance bands are at 2.1 μm and the vibrational level transitions (00031) - (00021) resonance bands are at 4.2 μm. Although vibration transitions (00031) - (00021) exist in the 4.2 μm band, the linear absorption spectrum line intensity is extremely low (lower than 1.5×10 -27cm-1/(molecule*cm-2)), basically can be regarded as wireless absorption, and the problem of path integration caused by linear absorption can be effectively avoided. Based on an optical dual-resonance scheme excited by an optical comb light source, a pump optical comb@2.1 mu m and a detection optical comb@4.2 mu m with time domain duration in the femtosecond order are oppositely combined, and under the condition that the pump optical comb and the detection optical comb have the same pulse width and repetition frequency, the pump optical comb and the detection optical comb excite optical dual-resonance transition in a fixed point position of space, namely, the pump optical comb excites CO 2 molecules from a ground state (00001) to a first excited state (00021), so that the population of CO 2 molecules in the first excited state is realized, and then the detection optical comb is absorbed to realize transition to a second excited state (00031). Therefore, the double-optical comb-optical double-resonance spectrum measurement technology is used for detecting information such as spectral line frequency, intensity, line type and the like of probe molecules (CO 2) at double resonance points, reducing information such as concentration, air pressure, flow speed, temperature and the like of substances at the double resonance points, effectively avoiding the problem of path integration of linear absorption and being an effective scheme for realizing laser spectrum chromatography diagnosis.
Example 2: as shown in fig. 3, the embodiment specifically relates to a temperature chromatography system based on a dual-optical comb-optical dual-resonance spectrum technology, which comprises a dual-optical comb light source module 1, a dual-resonance chromatography temperature measurement module 2 and a spectrum detection and analysis module 3.
The double optical comb light source module 1 consists of a signal optical comb light source 11, a local oscillation optical comb light source 12 and a standard signal reference source 13. The signal light comb light source 11 outputs a signal light comb light signal of a mid-infrared band and enters the dual-resonance chromatography temperature measurement module 2, the local oscillation light comb light source 12 outputs a local oscillation light comb light signal of the mid-infrared band and enters the spectrum detection and analysis module 3, and the standard signal reference source 13 is used for setting the repetition frequency difference as. The repetition frequency of the signal light comb light signal is/>The repetition frequency of the local oscillator optical comb optical signal is/>. The spectrum coverage of the signal optical comb optical signal and the local oscillator optical comb optical signal is 4.0-4.3 mu m, the signal optical comb optical signal and the local oscillator optical comb optical signal are in a near-zero chirp state, and the pulse duration is close to the Fourier transform limit (about 100 fs). In this embodiment, the standard signal reference source 13 is a rubidium atomic clock capable of providing high-precision and high-stability frequency standard, the repetition frequencies of the signal optical comb light source 11 and the local oscillator optical comb light source 12 are both referenced to the atomic clock, the repetition frequency can be selected within the range of 100-500MHz, and the repetition frequency difference/>Can be selected within the range of 0.5-5kHz according to actual requirements. The mid-infrared comb light source used in the method can be arbitrarily selected from mid-infrared comb generation technologies based on light-light modulation, difference frequency generation, optical parametric oscillation and the like according to actual requirements; the standard signal reference source can be arbitrarily selected from atomic clocks, rubidium atomic clocks, cesium atomic clocks and other reference sources; the spectral coverage (operating band) can be arbitrarily selected according to the selected probe molecule and transition energy level; the pulse width can be arbitrarily selected according to the spectral width and the required spatial resolution; the above conditions are not limited.
The dual-resonance chromatography temperature measurement module 2 comprises a beam splitter 21, a nonlinear frequency converter 22, a time domain retarder 23 and a high Wen Liuchang detection area 24.
The beam splitter 21 is composed of a first half-wave plate 211 and a polarization beam splitter prism 212, the first half-wave plate 211 is used for changing the polarization state of the signal optical comb optical signal, the polarization beam splitter prism 212 is used for dividing the signal optical comb optical signal after the polarization state is changed into a first pump optical comb optical signal and a first detection optical comb optical signal, the first pump optical comb optical signal is a transmission output optical signal, and the first detection optical comb optical signal is a reflection output optical signal; the power ratio of the first pump light comb signal to the first probe light comb signal can be adjusted by rotating the angle of the first half wave plate 211, the working spectrum range of the first half wave plate 211 covers 4.0-4.3 μm, and the extinction ratio of the polarization beam splitter prism 212 is less than 1:1000; the first pump comb optical signal is input to the nonlinear frequency converter 22, and the first probe comb optical signal is input to the high Wen Liuchang probe region 24.
The nonlinear frequency converter 22 is composed of a second half wave plate 221, a first plano-convex lens 222, a nonlinear crystal 223 and a second plano-convex lens 224; the second half wave plate 221 is configured to adjust the polarization state of the first pump comb signal to meet the phase matching condition of the nonlinear crystal 223, and output a second pump comb signal; the first plano-convex lens 222 is configured to focus the second pump light comb signal and output a third pump light comb signal; the nonlinear crystal 223 is configured to perform nonlinear frequency conversion on the third pump light comb signal, and output a fourth pump light comb signal; the second plano-convex lens 224 is configured to collimate the fourth pump light comb optical signal, output a fifth pump light comb optical signal, and input the fifth pump light comb optical signal to the time domain retarder 23; the materials of the first plano-convex lens 222 and the second plano-convex lens 224 are calcium fluoride materials, and can be arbitrarily selected from materials such as calcium fluoride, elemental germanium, zinc sulfide, zinc selenide, infrared glass and the like according to actual requirements, and the focal length range is 50-200mm; the spot size of the fifth pump comb optical signal is the same as the spot size of the first probe comb optical signal by adjusting the focal length ratio of the first plano-convex lens 222 and the second plano-convex lens 224; the nonlinear crystal 223 is a non-periodically polarized lithium niobate crystal (the doping concentration of magnesium oxide is 5%), and can be arbitrarily selected from the medium such as lithium niobate crystal, barium metaborate crystal, lithium triborate crystal, raman fiber, optical waveguide and the like according to actual requirements; the aperiodic polarized lithium niobate crystal has the size of 35 x 10 x 1mm, the polarization period of 26.90-29.50 mu m, the period step of 0.1 mu m/mm, the front surface coated with a 4.0-4.4 mu m high transmission film and a 2.0-2.2 mu m high reflection film, and the back surface coated with a 4.0-4.4 mu m high transmission film and a 2.0-2.2 mu m high transmission film.
The time domain retarder 23 is composed of a mechanical displacement platform 232, a return mirror 231 and a first reflecting mirror 233 which are fixed on the mechanical displacement platform; the return mirror 231 is configured to delay and reflect an input fifth pump comb optical signal and input the fifth pump comb optical signal to the first reflecting mirror 233, and the first reflecting mirror 233 is configured to reflect the fifth pump comb optical signal and input the fifth pump comb optical signal to the high Wen Liuchang detection area 24; the mechanical displacement platform 232 is used for adjusting the time delay of the fifth pump light comb light signal. The reflectivity of the return mirror 231 and the first reflecting mirror 233 at 2-5 μm is higher than 90%; the mechanical displacement platform 232 can be controlled by computer programming, and the stepping precision is 0.1-1 mu m, and the mechanical stroke is 1-3m.
The high-temperature flow field detection region 24 consists of a filter 241, a second reflecting mirror 242, a dichroic mirror 243 and a high-temperature combustion region 244; the dichroic mirror 243 is configured to reflect the fifth pump comb light signal and input the fifth pump comb light signal to the high temperature combustion area 244; the filter 241 transmits the input first detection optical comb signal, and outputs a second detection optical comb signal, that is, the transmitted first detection optical comb signal; the second reflecting mirror 242 is configured to reflect the second detected optical comb signal and input the second detected optical comb signal to the high-temperature combustion area 244; when the reflected fifth pump light comb light signal and the reflected second probe light comb light signal coincide in the high-temperature combustion area 244, after loading an optical double resonance transition spectrum excited by combustion products in the high-temperature combustion area 244, outputting a third probe light comb light signal and a residual fifth pump light comb light signal; the third detection optical comb signal is transmitted by the dichroic mirror 243 and then input to the spectrum detection and analysis module 3; the residual fifth pump light comb signal is input to the second reflector 242, and is filtered by the filter 241 after being reflected by the second reflector 242, so as to prevent the residual fifth pump light comb signal from interfering the optical path. The filter 241 is a 4.0-4.4 μm band-pass filter, and can isolate the residual pump light comb of reverse transmission; the dichroic mirror 243 has high transmittance in a 4.0-4.4 μm band and high reflectance in a 2.0-2.2 μm band; the high temperature combustion zone 244 is a natural gas combustion flame zone, the combustion products of which act as probe molecules. The combustion products vary according to the materials burned in the high temperature combustion zone 244, and according to actual requirements, the combustion products may be molecules such as carbon dioxide, water vapor, carbon monoxide, methane, acetylene, etc. The high Wen Liuchang measurement scene is a combustion environment, and the application scene comprises, but is not limited to, fuel combustion, aerospace engine tail flame, combustion of an internal combustion engine, high-temperature smelting and the like. The above conditions are not limited.
The spectrum detection and analysis module 3 consists of a photoelectric detection and data acquisition device 31 and a data processing and analysis device 32. The photoelectric detection and data acquisition device 31 consists of a third reflecting mirror 311, a beam combining sheet 312 and a photoelectric detector 313; the beam combining sheet 312 is a 50:50 beam combining sheet, and the working wave band is 4-4.4 mu m; in this embodiment, the photodetector 313 is a mid-infrared high-speed photodetector with a bandwidth of 0.1-2000MHz and a response band of 3-5 μm. The third reflecting mirror 311 is configured to reflect the input third detection optical comb optical signal; the beam combining sheet 312 is configured to combine the reflected third detection optical comb signal and the local oscillation optical comb signal, output a combined optical signal, and input the combined optical signal to the photodetector 313; the photodetector 313 is used for generating a double optical comb interference signal by combining the optical signals and inputting the double optical comb interference signal to the data processing and analyzing device 32. The data processing and analyzing device 32 consists of a data acquisition card 321 and an electronic computer 322, and completes data processing and analyzing work including fast Fourier transform, optical frequency domain reduction, spectral line fitting and analysis and the like; the sampling rate range of the data acquisition card 321 is 200-500MHz; the electronic computer 322 may be programmed to control the mechanical displacement platform 232. The data acquisition card 321 digitizes the input double optical comb interference signal to obtain a digital signal and transmits the digital signal to the electronic computer 322; the electronic computer 322 is configured to perform time domain coherent averaging, fast fourier transform, optical frequency domain reduction, spectral line fitting and analysis on the digital signal to obtain high temperature combustion field information, and control the mechanical displacement platform 232 to adjust the step fixed length thereof for changing the time delay of the fifth pump optical comb optical signal, so that the dual resonance points traverse the high temperature flow field, and high Wen Liuchang chromatography is completed.
Example 3: as shown in fig. 4, this embodiment discloses a temperature field chromatography measurement method based on a dual-optical comb-optical dual-resonance spectroscopy, which is implemented by a temperature chromatography system based on a dual-optical comb-optical dual-resonance spectroscopy disclosed in embodiment 1, and specifically includes the following steps:
(1) The output repetition frequency difference of the double-optical comb light source module 1 is The signal optical comb optical signals and the local oscillation optical comb optical signals are transmitted to the double-resonance chromatography temperature measurement module 2, and the local oscillation optical comb optical signals are transmitted to the spectrum detection and analysis module 3.
(2) The dual-resonance chromatography temperature measurement module 2 comprises a beam splitter 21, a nonlinear frequency converter 22, a time domain retarder 23 and a high Wen Liuchang detection area 24;
the beam splitter 21 divides the signal optical comb optical signal into a first pump optical comb optical signal and a first detection optical comb optical signal, the first pump optical comb optical signal is transmitted to the nonlinear frequency converter 22, and the first detection optical comb optical signal is transmitted to the high Wen Liuchang detection region 24;
The nonlinear frequency converter 22 performs nonlinear frequency conversion on the first pump light comb optical signal, and outputs a fifth pump light comb optical signal, so that frequencies of the fifth pump light comb optical signal and the first probe light comb optical signal meet a dual-resonance condition;
the time domain delayer 23 reflects the fifth pump light comb light signal;
the high-temperature flow field detection area transmits the first detection optical comb optical signal, and after the reflected fifth pumping optical comb optical signal and the transmitted first detection optical comb optical signal load the optical double-resonance transition spectrum excited by the combustion product, a third detection optical comb optical signal containing double-resonance transition spectral line information of the combustion product is output and transmitted to the spectrum detection and analysis module 3.
(3) The spectrum detection and analysis module 3 performs beam combination on the third detection optical comb optical signal and the local oscillation optical comb optical signal to output a beam combination optical signal, then digitizes the beam combination optical signal to obtain a digital signal, and performs time domain coherent averaging, fast Fourier transformation, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
Example 4: the embodiment discloses a temperature field chromatography measurement method based on a double-optical comb-optical double-resonance spectrum technology, which is realized by a temperature chromatography system based on the double-optical comb-optical double-resonance spectrum technology disclosed in embodiment 1, and specifically comprises the following steps:
(1) The frequencies of the signal optical comb light source 11 and the local oscillation optical comb light source 12 are locked to a standard signal reference source 13, the repetition frequency jitter of the signal optical comb and the local oscillation optical comb is controlled within the frequency error of the signal source, and the repetition frequency difference of the two optical comb light sources is set as ; The signal optical comb light source 11 outputs a signal optical comb light signal with stable frequency and enters the double-resonance chromatography temperature measurement module 2, and the local oscillation optical comb light source 12 outputs a local oscillation optical comb light signal with stable frequency and enters the spectrum detection and analysis module 3.
(2) The signal optical comb optical signal is input into the beam splitter 21 and is divided into two beams sequentially through the first half wave plate 211 and the polarization beam splitting prism 212, the transmission output optical signal is a first pump optical comb optical signal, and the reflection output optical signal is a first detection optical comb optical signal; controlling the power ratio of the first pump light comb light signal to the first probe light comb light signal by adjusting the angle of the first half wave plate 211 so as to maximize the power of the first pump light comb light signal, wherein the optical power of the first probe light comb light signal is 0.05mW; the first pump comb optical signal is output to the nonlinear frequency converter 22, and the first probe comb optical signal is output to the high Wen Liuchang probe region 24.
(3) Adjusting the angle of the second half wave plate 221 in the nonlinear frequency converter 22, changing the polarization state of the first pump light comb signal, and outputting a second pump light comb signal; the second pump light comb signal is focused by the first plano-convex lens 222, and a third pump light comb signal is output; the output third pump light comb light signal completes nonlinear frequency conversion through nonlinear crystal 223, and outputs fourth pump light comb light signal; the fourth pump light comb signal is collimated by the second plano-convex lens 224, and a fifth pump light comb signal is output and input to the time domain retarder 23; the spot size of the fifth pump comb optical signal is the same as the spot size of the first probe comb optical signal by adjusting the focal length ratio of the first plano-convex lens 222 and the second plano-convex lens 224.
(4) The fifth pump comb light signal inputted to the time domain retarder 23 is reflected by the return mirror 231 and the first mirror 233 fixed on the mechanical displacement platform 232 in sequence and inputted to the high Wen Liuchang detection area 24.
(5) The fifth pump comb light signal inputted to the high Wen Liuchang detection region 24 is inputted to the high-temperature combustion field region 244 after being reflected by the dichroic mirror 243; the first detection optical comb optical signal input to the high Wen Liuchang detection region 24 is transmitted through the filter 241, and the second detection optical comb optical signal is output; the second detection optical comb signal is reflected by the second reflecting mirror 242 and then input to the high-temperature combustion field 244; the second detection optical comb optical signal and the fifth pump optical comb optical signal input to the high-temperature combustion field area 244 are output after the optical double-resonance transition excited by the combustion products of the high-temperature combustion area 244 is loaded, and a third detection optical comb optical signal and a residual fifth pump optical comb optical signal are output, wherein the third detection optical comb optical signal comprises double-resonance transition spectral line information of the combustion products; the third detection optical comb signal is transmitted by the dichroic mirror 243 and then input to the spectrum detection and analysis module 3; the residual fifth pump light comb signal is input to the second reflector 242, and is filtered by the filter 241 after being reflected by the second reflector 242, so as to prevent the residual fifth pump light comb signal from interfering the optical path.
(6) The third detection optical comb signal is reflected by the third reflector 311 and then input to the beam combining sheet 312; the beam combining sheet 312 combines the reflected three detection optical comb signals and the local oscillation optical comb signals, outputs a combined optical signal, and inputs the combined optical signal to the photodetector 313; the combined optical signal is processed by a photodetector 313 to generate a double optical comb interference signal, which is input to a data processing and analyzing device 32.
(7) The double optical comb interference signals are digitized by a data acquisition card 321 to obtain digital signals, and the digital signals are transmitted to an electronic computer 322; the electronic computer 322 performs time domain coherent averaging, fast fourier transform, optical frequency domain reduction, spectral line fitting and analysis operations on the digital signal to obtain high temperature combustion field information.
(8) The electronic computer 322 controls the mechanical displacement platform 232 to adjust the stepping fixed length of the mechanical displacement platform 232, changes the time delay of the fifth pumping light comb light signal, makes the double resonance points traverse the high-temperature combustion area, and sequentially repeats the step (7) to obtain temperature information of different positions in the high-temperature combustion area, thereby completing the chromatographic scanning operation of the high-temperature combustion area.
Example 5: referring to fig. 5, a temperature chromatography device based on dual optical comb-optical dual resonance spectroscopy according to an embodiment of the present invention includes one or more processors configured to implement the temperature chromatography method based on dual optical comb-optical dual resonance spectroscopy according to the above embodiment.
The embodiment of the temperature chromatography device based on the double-optical comb-optical double-resonance spectrum technology can be applied to any equipment with data processing capability, such as a computer and the like. The apparatus embodiments may be implemented by software, or may be implemented by hardware or a combination of hardware and software. Taking software implementation as an example, the device in a logic sense is formed by reading corresponding computer program instructions in a nonvolatile memory into a memory by a processor of any device with data processing capability. In terms of hardware, as shown in fig. 5, a hardware structure diagram of an apparatus with optional data processing capability where the temperature chromatography device based on the dual-optical comb-optical dual-resonance spectroscopy of the present invention is located is shown in fig. 5, and in addition to the processor, the memory, the network interface, and the nonvolatile memory shown in fig. 5, the optional apparatus with data processing capability in the embodiment generally includes other hardware according to the actual function of the optional apparatus with data processing capability, which is not described herein again.
The implementation process of the functions and roles of each unit in the above device is specifically shown in the implementation process of the corresponding steps in the above method, and will not be described herein again.
For the device embodiments, reference is made to the description of the method embodiments for the relevant points, since they essentially correspond to the method embodiments. The apparatus embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purposes of the present invention. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The embodiment of the invention also provides a computer readable storage medium, on which a program is stored, which when executed by a processor, implements the temperature chromatography method based on the dual optical comb-optical dual resonance spectroscopy in the above embodiment.
The computer readable storage medium may be an internal storage unit, such as a hard disk or a memory, of any of the data processing enabled devices described in any of the previous embodiments. The computer readable storage medium may also be an external storage device of any device having data processing capabilities, such as a plug-in hard disk, a smart memory card (SMART MEDIA CARD, SMC), an SD card, a flash memory card (FLASH CARD), etc. provided on the device. Further, the computer readable storage medium may include both internal storage units and external storage devices of any data processing device. The computer readable storage medium is used for storing the computer program and other programs and data required by the arbitrary data processing apparatus, and may also be used for temporarily storing data that has been output or is to be output.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather to enable any modification, equivalent replacement, improvement or the like to be made within the spirit and principles of the invention.
Claims (6)
1. A temperature chromatographic system based on a dual optical comb-optical dual resonance spectroscopy technique, comprising: the device comprises a double-optical comb light source module, a double-resonance chromatography temperature measurement module and a spectrum detection and analysis module;
The dual-optical comb light source module is used for outputting a repetition frequency difference of A signal optical comb optical signal and a local oscillator optical comb optical signal;
The double-resonance chromatography temperature measurement module comprises a beam splitter, a nonlinear frequency converter, a time domain retarder and a high-temperature flow field detection area;
the beam splitter is used for dividing the signal optical comb optical signal into a first pump optical comb optical signal and a first detection optical comb optical signal;
The beam splitter consists of a first half wave plate and a polarization beam splitting prism; the first half wave plate is used for changing the polarization state of the signal light comb optical signals, and the polarization beam splitter prism is used for dividing the signal light comb optical signals with the changed polarization state into first pump light comb optical signals and first detection light comb optical signals; adjusting the power ratio of the first pump light comb light signal to the first probe light comb light signal by rotating the angle of the first half wave plate; the first pump light comb light signal is input to a nonlinear frequency converter; the first detection optical comb optical signal is input to a high Wen Liuchang detection area;
the nonlinear frequency converter is used for carrying out nonlinear frequency conversion on the first pump light comb light signal and outputting a fifth pump light comb light signal so that the frequencies of the fifth pump light comb light signal and the first detection light comb light signal meet a double-resonance condition;
The nonlinear frequency converter consists of a second half wave plate, a first plano-convex lens, a nonlinear crystal and a second plano-convex lens; the second half wave plate is used for adjusting the polarization state of the first pump light comb light signal to meet the phase matching condition of the nonlinear crystal and outputting a second pump light comb light signal; the first plano-convex lens is used for focusing the second pump light comb light signal and outputting a third pump light comb light signal; the nonlinear crystal is used for carrying out nonlinear frequency conversion on the third pump light comb light signal and outputting a fourth pump light comb light signal; the second plano-convex lens is used for collimating the fourth pump light comb light signal, outputting a fifth pump light comb light signal and inputting the fifth pump light comb light signal to the time domain delayer;
The time domain delayer is used for reflecting the fifth pump light comb light signal;
The time domain delayer consists of a mechanical displacement platform, a return mirror and a first reflecting mirror, wherein the return mirror and the first reflecting mirror are fixed on the mechanical displacement platform; the return mirror is used for carrying out delay reflection on the input fifth pump light comb light signal and inputting the fifth pump light comb light signal to the first reflecting mirror; the first reflecting mirror is used for reflecting the fifth pump light comb light signal and inputting the fifth pump light comb light signal to the high Wen Liuchang detection area; the mechanical displacement platform is used for adjusting the time delay of the fifth pump light combing signal;
The high-temperature flow field detection area is used for transmitting the first detection optical comb optical signal, and outputting a third detection optical comb optical signal containing double-resonance transition spectral line information of the combustion product after loading an optical double-resonance transition spectrum excited by the combustion product through the reflected fifth pump optical comb optical signal and the transmitted first detection optical comb optical signal;
The high-temperature flow field detection area consists of a filter plate, a second reflecting mirror, a dichroic mirror and a high-temperature combustion area; the filter transmits the input first detection optical comb optical signals and outputs second detection optical comb optical signals; the second reflecting mirror is used for reflecting a second detection light comb light signal and inputting the second detection light comb light signal into the high-temperature combustion area; the input fifth pump light comb light signal is reflected by the dichroic mirror and is input into the high-temperature combustion area; when the reflected fifth pumping light comb light signal and the reflected second detection light comb light signal are overlapped in the high-temperature combustion area, after an optical double-resonance transition spectrum excited by combustion products in the high-temperature combustion area is loaded, outputting a third detection light comb light signal and a residual fifth pumping light comb light signal; the third detection light comb light signal is transmitted by the dichroic mirror and then is input to the spectrum detection and analysis module; the residual fifth pump light comb light signal is input to the second reflecting mirror, is reflected by the second reflecting mirror and is filtered by the filter, so that the residual fifth pump light comb light signal is prevented from interfering the light path;
The spectrum detection and analysis module is used for combining the third detection optical comb optical signal and the local oscillation optical comb optical signal to output a combined optical signal, then digitizing the combined optical signal to obtain a digital signal, and performing time domain coherent averaging, fast Fourier transform, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
2. The temperature chromatography system based on the double optical comb-optical double resonance spectrum technology according to claim 1, wherein the double optical comb light source module consists of a signal optical comb light source, a local oscillator optical comb light source and a standard signal reference source; the signal light comb light source is used for outputting a signal light comb light signal; the local oscillation optical comb light source is used for outputting local oscillation optical comb light signals; the standard signal reference source is used for setting the repetition frequency difference as。
3. The temperature chromatography system based on the double-optical comb-optical double-resonance spectrum technology according to claim 1, wherein the spectrum detection and analysis module consists of a photoelectric detection and data acquisition device and a data processing and analysis device;
The photoelectric detection and data acquisition device consists of a third reflecting mirror, a beam combining sheet and a photoelectric detector; the third reflecting mirror is used for reflecting the input third detection optical comb optical signals; the beam combining sheet is used for combining the reflected third detection optical comb optical signal and the local oscillation optical comb optical signal, outputting a combined optical signal and inputting the combined optical signal to the photoelectric detector; the photoelectric detector is used for receiving the combined light signals, generating double-optical comb interference signals and inputting the double-optical comb interference signals to the data processing and analyzing device;
The data processing and analyzing device consists of a data acquisition card and an electronic computer; the data acquisition card digitizes the input double optical comb interference signals to obtain digital signals and transmits the digital signals to the electronic computer; the electronic computer is used for carrying out time domain coherent averaging, fast Fourier transformation, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signals to obtain high-temperature combustion field information, and is used for controlling the mechanical displacement platform to adjust the stepping fixed length of the mechanical displacement platform for changing the time delay of the fifth pumping optical comb optical signals, so that the double resonance points traverse the high-temperature flow field, and high Wen Liuchang chromatography is completed.
4. A temperature chromatography method based on double optical comb-optical double resonance spectroscopy, characterized by being applied to the system of any one of claims 1-3, comprising the steps of:
(1) The output repetition frequency difference of the double-optical comb light source module is The signal optical comb optical signals and the local oscillation optical comb optical signals are transmitted to the double-resonance chromatography temperature measurement module, and the local oscillation optical comb optical signals are transmitted to the spectrum detection and analysis module;
(2) The beam splitter divides the signal optical comb optical signals into first pump optical comb optical signals and first detection optical comb optical signals, the first pump optical comb optical signals are transmitted to the nonlinear frequency converter, and the first detection optical comb optical signals are transmitted to the high Wen Liuchang detection area;
(3) The nonlinear frequency converter carries out nonlinear frequency conversion on the first pump light comb light signal and outputs a fifth pump light comb light signal, so that the frequencies of the fifth pump light comb light signal and the first detection light comb light signal meet the double resonance condition;
(4) The time domain delayer reflects the fifth pump light comb light signal;
(5) The high-temperature flow field detection area transmits the first detection optical comb optical signal, loads an optical double-resonance transition spectrum excited by a combustion product through the reflected fifth pumping optical comb optical signal and the transmitted first detection optical comb optical signal, outputs a third detection optical comb optical signal containing double-resonance transition spectral line information of the combustion product, and transmits the third detection optical comb optical signal to the spectrum detection and analysis module;
(6) The spectrum detection and analysis module performs beam combination on the third detection optical comb optical signal and the local oscillation optical comb optical signal to output a combined optical signal, then digitizes the combined optical signal to obtain a digital signal, and performs time domain coherent averaging, fast Fourier transform, optical frequency domain restoration, spectral line fitting and analysis operation on the digital signal to obtain high-temperature combustion field information; and driving the time domain delayer to step to finish the tomographic measurement.
5. A dual optical comb-optical dual resonance spectroscopy-based temperature tomography apparatus comprising one or more processors configured to implement the dual optical comb-optical dual resonance spectroscopy-based temperature tomography method of claim 4.
6. A computer readable storage medium having a program stored thereon, which when executed by a processor is adapted to carry out the temperature tomography method based on the dual optical comb-optical dual resonance spectroscopy technique of claim 4.
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