CN116465501A - Method and system for measuring NESR (near infrared spectrometer) of infrared spectrum radiometer based on calibration residual error - Google Patents
Method and system for measuring NESR (near infrared spectrometer) of infrared spectrum radiometer based on calibration residual error Download PDFInfo
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Abstract
The present disclosure provides a method and a system for measuring NESR of an infrared spectrum radiometer based on a calibration residual error, which relate to the technical field of infrared spectrum and comprise the steps of obtaining the mean value interference data of a low-temperature blackbody and obtaining the mean value interference data of a high-temperature blackbody; respectively carrying out spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum; calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on the complex spectrum of the low-temperature blackbody and the complex spectrum of the high-temperature blackbody; and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument. The phase deviation caused by different temperature target scenes, the self radiation of the instrument and the like can be eliminated better, and the testing precision of the Fourier transform infrared spectrum radiometer is improved.
Description
Technical Field
The disclosure relates to the technical field of infrared spectroscopy, in particular to an infrared spectrum radiometer NESR measurement method and system based on a calibration residual error.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
NESR (noise equivalent spectral radiance) is an important indicator for measuring the detection sensitivity of a Fourier transform infrared spectrum radiometer. According to theoretical formulas, NESR is related to the factors of instantaneous field angle, optical efficiency, interferometer modulation degree, optical effective aperture, photosensitive area of the detector, integration time, sampling times, spectral resolution, spectral response rate of the detector and the like of the Fourier transform infrared spectrum radiometer. In consideration of the fact that parameters such as an interferometer modulation degree, an instantaneous field angle and the like are difficult to measure in practice, great inconvenience is brought to the work such as acceptance, comparison and test of the Fourier transform infrared spectrum radiometer.
The Fourier transform spectrum measurement technology has the advantages of high spectrum resolution, high luminous flux, multiple channels, wide spectrum coverage and the like, and is a very important high-resolution spectrum analysis technology. In particular to broadband infrared spectrum radiation measurement, the method is widely applied to a plurality of fields such as space remote sensing, target characteristic research, atmosphere detection, material analysis, security protection, metering, laboratory, environment, medical treatment, military analysis, criminal investigation and the like. With the rapid development of infrared stealth technology, hypersonic technology and the like, urgent demands are made for high-sensitivity real-time infrared spectrum radiation parameter measurement of low-radiation, rapid flash targets and the like.
The existing NESR evaluation method is mostly based on a scheme of combining real number radiometric calibration with a plurality of measurement standard blackbody targets and calculating standard deviation of a plurality of measurement results, at the moment, the calculated value of the NESR is directly related to the measurement times of the standard blackbody targets, a large amount of data are required to be obtained to obtain an approximate value, the test is time-consuming and labor-consuming, the massive data are required to be processed, and the influence of a data processing scheme on infrared spectrum radiometric measurement is not considered, so that the evaluated NESR deviation is larger.
Disclosure of Invention
In order to solve the problems, the invention provides a calibration residual error-based NESR measurement method and a calibration residual error-based NESR measurement system for an infrared spectrum radiometer, which eliminate phase deviation caused by different temperature target scenes, instrument self radiation and the like by adopting phase alignment and complex radiation calibration, improve the testing precision of the Fourier transform infrared spectrum radiometer and provide more real instrument NESR parameters.
According to some embodiments, the present disclosure employs the following technical solutions:
an infrared spectrum radiometer NESR measurement method based on a calibration residual error, comprising the following steps:
setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
respectively carrying out spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum; calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on the complex spectrum of the low-temperature blackbody and the complex spectrum of the high-temperature blackbody;
and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
According to some embodiments, the present disclosure employs the following technical solutions:
an infrared spectrum radiometer NESR measurement system based on a scaled residual, comprising:
parameter preprocessing module: the method comprises the steps of setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining average interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
the inversion module is used for performing spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data respectively to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum;
the NESR value measurement module is used for calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on a low-temperature blackbody complex spectrum and a high-temperature blackbody complex spectrum; and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
According to some embodiments, the present disclosure employs the following technical solutions:
a non-transitory computer readable storage medium for storing computer instructions which, when executed by a processor, implement the scaling residual based infrared spectrum radiometer NESR measurement method.
According to some embodiments, the present disclosure employs the following technical solutions:
an electronic device, comprising: a processor, a memory, and a computer program; wherein the processor is connected to the memory, and the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory, so that the electronic device executes the infrared spectrum radiometer NESR measurement method based on the scaling residual error.
Compared with the prior art, the beneficial effects of the present disclosure are:
the invention provides a high-precision simple measurement method for the NESR index of the Fourier transform infrared spectrum radiometer, which does not need to obtain instrument parameters which are difficult to measure, such as an interferometer modulation degree, system optical efficiency and the like, reduces the measurement difficulty and solves the problem of complex instrument performance evaluation;
compared with the conventional standard deviation method, the method for measuring the NESR parameters through the complex radiometric calibration residual error evaluation not only improves the measurement accuracy, but also greatly reduces the data acquisition amount and the data processing amount in the test process, and can reflect the noise characteristics and the detection sensitivity of the instrument more intuitively and accurately;
according to the NESR evaluation and measurement method, by adopting the phase alignment and complex radiometric calibration scheme, phase deviation caused by radiation and the like of the instrument and between different temperature target scenes can be eliminated better, the testing precision of the Fourier transform infrared spectrum radiometer can be improved, and more real NESR parameters of the instrument can be provided;
the present disclosure is applicable to fast performance evaluation and inspection of fourier transform infrared spectrum radiometers.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure, illustrate and explain the exemplary embodiments of the disclosure and together with the description serve to explain the disclosure, and do not constitute an undue limitation on the disclosure.
Fig. 1 is a block diagram of an infrared spectrum radiometer NESR evaluation measurement flow based on a scaled residual in an embodiment of the present disclosure.
The specific embodiment is as follows:
the disclosure is further described below with reference to the drawings and examples.
It should be noted that the following detailed description is illustrative and is intended to provide further explanation of the present disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments in accordance with the present disclosure. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.
Example 1
In one embodiment of the present disclosure, there is provided a method for measuring NESR of infrared spectrum radiometer based on scaled residuals, comprising:
step one: setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
step two: respectively carrying out spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum; calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on the complex spectrum of the low-temperature blackbody and the complex spectrum of the high-temperature blackbody;
step three: and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
As an embodiment, the specific calibration residual error-based infrared spectrum radiometer NESR evaluation measurement method is implemented as follows:
step 1: setting the standard blackbody temperature to be a low temperature T L Waiting for the temperature of the black body to stabilize;
step 2: collecting interference data of the low-temperature blackbody, and performing superposition mean value to obtain mean interference data IFG of the low-temperature blackbody L ；
Step 3: setting the standard blackbody temperature to be a high temperature T H Waiting for the temperature of the black body to stabilize;
step 4: interference data of the high-temperature blackbody is collected, and an overlapping average value is carried out to obtainMean interference data IFG of high-temperature blackbody H ；
Step 5: respectively for the obtained low-temperature blackbody mean interference data IFG L Mean interference data IFG of high-temperature blackbody H Performing spectrum inversion to obtain a corresponding low-temperature blackbody complex spectrum Sp L (lambda) high temperature blackbody complex spectrum Sp H (λ)；
Step 6: based on low-temperature blackbody complex spectrum Sp L (lambda) high temperature blackbody complex spectrum Sp H (lambda) calculating a complex radiometric scaling factor R using a complex radiometric scaling method ca (λ)、R bis (λ)；
Step 7: setting the standard blackbody temperature to be a temperature T corresponding to the NESR test temperature of the instrument NESR Waiting for the temperature of the black body to stabilize;
step 8: the interference data of the blackbody are collected, and the superimposed mean value is carried out to obtain mean interference data IFG of the blackbody at the NESR test temperature NESR ；
Step 9: mean interference data IFG NESR Obtaining a recovered complex spectrum Sp through Fourier transformation NESR (lambda) and using scaling factor R ca (λ)、R bis (lambda) complex radiometric scaling to obtain a scaled spectral radiance Sp ca (λ)；
Step 10: taking the calibration spectral radiance Sp ca The imaginary residual value of (λ) is taken as the NESR value of the instrument.
As an embodiment, before the step 2, the step 4 and the step 8 are performed to perform the interference data superposition mean value, firstly identifying and removing abnormal interference data, and performing the processes such as interference data zero optical path difference point detection; and zero optical path difference point is adopted as a datum reference point when the superposition mean value is carried out.
And step 5 and step 9, before performing spectrum inversion, preprocessing such as interference data burr detection correction, nonlinear correction, interference data direct current item rejection, interference data truncation or zero addition, interference data translation transformation, fringe counting error detection correction and the like is needed to detect and propose interference data with errors.
In step 6 and step 9, before calculating the complex radiometric calibration coefficients and the complex radiometric calibration, the complex spectra of the low-temperature blackbody complex spectra and the NESR test are subjected to phase alignment treatment by taking the high-temperature blackbody complex spectra as a reference, so as to eliminate phase deviations caused by the target scenes with different temperatures, the self-radiation of the instrument, and the like.
The NESR test temperature of the instrument is selected by fully considering the equivalent bright temperature corresponding to the spectral response peak value of the detector, the use requirement of the instrument, the industry specification and the like, and selecting the proper NESR test temperature.
The band selection in NESR calculation should be combined with the factors of the peak area of the spectral response of the detector, the infrared transmittance of the ambient atmosphere, the working band of the instrument, and the like to select a proper spectral band.
As an example, in step 6, a complex radiation scaling factor R ca (ν)、R bis The calculation steps of (v) are as follows:
according to the Planckian formula and the standard blackbody emissivity, respectively calculating the standard value Lp of the infrared spectrum radiance of the high-temperature blackbody and the low-temperature blackbody L (λ)、Lp L (λ)：
Wherein F is inst Instantaneous field angle, T, for Fourier transform infrared spectrum radiometer L And T H The temperatures of the low-temperature black body and the high-temperature black body are respectively shown in the unit of K and c 1 ＝3.7415×10 4 W·cm -2 ·μm 4 For a first radiation constant, c 2 ＝1.43879×10 4 Mu m.K is the second radiation constant, lambda is the spectral wavelength in mu m.
Complex radiation scaling factor R ca (λ)、R bis (lambda) is given according to the following formula:
complex radiation scaling, calculated according to the following formula:
in step 10, the instrument NESR calculates according to the following formula:
NESR＝Im(Sp ca (λ)) (6)
where Im () represents an operation taking the imaginary part of a complex number.
Example 2
In one embodiment of the present disclosure, there is provided an infrared spectrum radiometer NESR measurement system based on scaled residuals, comprising:
parameter preprocessing module: the method comprises the steps of setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining average interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
the inversion module is used for performing spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data respectively to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum;
the NESR value measurement module is used for calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on a low-temperature blackbody complex spectrum and a high-temperature blackbody complex spectrum; and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
Example 3
In one embodiment of the present disclosure, a non-transitory computer readable storage medium is provided for storing computer instructions which, when executed by a processor, implement the scaling residual based infrared spectrum radiometer NESR measurement method steps.
Example 4
In one embodiment of the present disclosure, there is provided an electronic device including: a processor, a memory, and a computer program; wherein the processor is connected to the memory, and the computer program is stored in the memory, and when the electronic device is running, the processor executes the computer program stored in the memory, so that the electronic device executes the steps of the infrared spectrum radiometer NESR measurement method based on the scaling residual error.
The present disclosure is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the disclosure. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While the specific embodiments of the present disclosure have been described above with reference to the drawings, it should be understood that the present disclosure is not limited to the embodiments, and that various modifications and changes can be made by one skilled in the art without inventive effort on the basis of the technical solutions of the present disclosure while remaining within the scope of the present disclosure.
Claims (10)
1. An infrared spectrum radiometer NESR measurement method based on a calibration residual error is characterized by comprising the following steps:
setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
respectively carrying out spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum; calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on the complex spectrum of the low-temperature blackbody and the complex spectrum of the high-temperature blackbody;
and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
2. The method for measuring NESR of infrared spectrum radiometer based on calibration residual error as set forth in claim 1, wherein the standard blackbody temperature is set to be low temperature, the temperature of the blackbody is waited to be stable, the mode of obtaining the mean value interference data of the low-temperature blackbody is to collect the interference data of the low-temperature blackbody, and the superimposed mean value is carried out to obtain the mean value interference data of the low-temperature blackbody.
3. The method for NESR measurement of infrared spectrum radiometer based on calibration residual error as set forth in claim 2, wherein before the interference data superposition mean value is carried out, firstly identifying and eliminating abnormal interference data, and carrying out interference data zero optical path difference point detection processing; and zero optical path difference point is adopted as a datum reference point when the superposition mean value is carried out.
4. The method for measuring NESR of infrared spectrum radiometer based on calibration residual error as set forth in claim 1, wherein the standard blackbody temperature is set to be high temperature, the blackbody temperature is waited to be stable, the mean value interference data of the high temperature blackbody is obtained by collecting the interference data of the high temperature blackbody and superposing the mean value, so as to obtain the mean value interference data of the high temperature blackbody.
5. The method for measuring NESR of infrared spectrometer based on calibration residual error as set forth in claim 1, wherein the preprocessing process of interference data burr detection correction, nonlinear correction, interference data direct current item rejection, interference data truncation or zero addition, interference data translation transformation and fringe counting error detection correction is performed before spectrum inversion is performed on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data respectively.
6. The method for measuring NESR of infrared spectrum radiometer based on calibration residual as set forth in claim 1, wherein said calculating complex radiation calibration coefficients is preceded by phase alignment of complex spectra of low temperature blackbody complex spectra and NESR test with reference to high temperature blackbody complex spectra, eliminating phase deviation introduced by different temperature target scenes and by radiation of the instrument itself.
7. The method for measuring NESR by using the infrared spectrum radiometer based on the calibration residual according to claim 1, wherein the method for measuring NESR value of the instrument is as follows: setting the standard blackbody temperature as the temperature corresponding to the NESR test temperature of the instrument, and waiting for the blackbody temperature to be stable; collecting interference data of the black body, and carrying out superposition mean value to obtain mean interference data of the black body at the NESR test temperature; the mean interference data is subjected to spectrum inversion to obtain a recovered complex spectrum, and complex radiometric calibration is carried out by using a complex radiometric calibration coefficient to obtain the radiation brightness of the calibrated spectrum; taking the imaginary residual value of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
8. An infrared spectrum radiometer NESR measurement system based on a scaled residual, comprising:
parameter preprocessing module: the method comprises the steps of setting the standard blackbody temperature to be low temperature, waiting for the blackbody temperature to be stable, and obtaining average interference data of the low-temperature blackbody; setting the standard blackbody temperature to be high temperature, waiting for the blackbody temperature to be stable, and obtaining the mean interference data of the high-temperature blackbody;
the inversion module is used for performing spectrum inversion on the obtained low-temperature blackbody mean interference data and the obtained high-temperature blackbody mean interference data respectively to obtain corresponding low-temperature blackbody complex spectrum and high-temperature blackbody complex spectrum;
the NESR value measurement module is used for calculating a complex radiation calibration coefficient by adopting a complex radiation calibration method based on a low-temperature blackbody complex spectrum and a high-temperature blackbody complex spectrum; and (3) performing complex radiometric calibration by using the complex radiometric calibration coefficient to obtain the radiation brightness of the calibration spectrum, and taking the residual value of the imaginary part of the radiation brightness of the calibration spectrum as the NESR value of the instrument.
9. A non-transitory computer readable storage medium for storing computer instructions which, when executed by a processor, implement the scaled residual based infrared spectrometer NESR measurement method of any of claims 1-7.
10. An electronic device, comprising: a processor, a memory, and a computer program; wherein the processor is connected to the memory, and wherein the computer program is stored in the memory, which processor, when the electronic device is running, executes the computer program stored in the memory to cause the electronic device to perform the method for implementing the scaled residual based infrared spectrometer NESR measurement according to any of the claims 1-7.
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