CN116046182A - Spectrum radiometer absolute radiation calibration device based on high-temperature blackbody - Google Patents
Spectrum radiometer absolute radiation calibration device based on high-temperature blackbody Download PDFInfo
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- 238000005259 measurement Methods 0.000 claims abstract description 11
- 238000012634 optical imaging Methods 0.000 claims abstract description 6
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- 238000012545 processing Methods 0.000 claims abstract description 3
- 238000000034 method Methods 0.000 claims description 32
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- 230000005457 Black-body radiation Effects 0.000 claims description 3
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/90—Testing, inspecting or checking operation of radiation pyrometers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0887—Integrating cavities mimicking black bodies, wherein the heat propagation between the black body and the measuring element does not occur within a solid; Use of bodies placed inside the fluid stream for measurement of the temperature of gases; Use of the reemission from a surface, e.g. reflective surface; Emissivity enhancement by multiple reflections
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Abstract
The invention belongs to the technical field of optical measurement and test, and discloses a spectrum radiometer absolute radiation calibration device based on a high-temperature blackbody, which comprises the following components: the high-temperature blackbody and optical imaging system comprises a first plane reflector, an off-axis parabolic mirror, a second plane reflector and a spectrum radiometer; after the spectrum radiation signal emitted by the high-temperature black body reaches the off-axis parabolic mirror after being reflected by the plane reflecting mirror, the output parallel light is received by the spectrum radiometer after being reflected by the plane reflecting mirror, and the signal acquisition and the processing are carried out to give a measurement result; and the spectral radiance at different temperatures is obtained by adjusting the temperature of the high-temperature black body. The invention meets the absolute radiation calibration measurement requirement of the spectrum radiometer.
Description
Technical Field
The invention belongs to the technical field of optical measurement and test, relates to a spectrum radiometer absolute radiation calibration device, and particularly relates to a high-temperature blackbody-based spectrum radiometer absolute radiation calibration device and establishment of a standard source database and a spectrum radiometer absolute radiation calibration database.
Background
With the development of space remote sensing technology, ultraviolet, visible and infrared remote sensing has important application in the aspects of atmospheric physics, environmental science, meteorology, target/background information and the like, and a spectrum radiometer has an irreplaceable function and comprises various spectrum radiometers from ultraviolet to far infrared. The method is widely used for measuring parameters such as light source spectrum radiation brightness, color temperature, color coordinates and the like, has the advantages of high measuring speed, high measuring precision and the like, and is widely applied to the fields.
Because the spectrum radiometer is used for detecting the target and measuring the radiation characteristics, the spectrum radiometer is required to be accurately radiometric calibrated before the development process and the external field use, and simultaneously, higher requirements are also provided for the calibration precision of the spectrum radiometer.
At present, the calibration of an infrared spectrum radiometer generally adopts a measurement result of a blackbody with known standard spectrum radiation characteristics to realize the conversion of an output signal of the instrument to a radiation signal, such as a radiation calibration method of a 2-14 mu m infrared spectrum radiometer, which provides a radiation calibration method of zonal multipoint calibration, but the method is not applicable to the calibration of a 0.7-1.8 mu m band spectrum radiometer.
The standard diffuse reflection method and the integrating sphere method are mainly adopted for calibrating the near infrared band spectrum radiometer, such as the comparison of three methods of calibrating the spectrum radiance of the space ultraviolet remote sensing spectrum radiometer on Chinese laser, the patent of near ultraviolet to near infrared spectrum radiometer, the calibration method thereof and the method for measuring the spectrum radiance of the integrating sphere light source, but the method does not consider the influence of the radiation temperature, when the radiation temperature changes from low to high, the peak value of the spectrum radiance moves to the short wave direction, and meanwhile, the gain multiple of equipment also changes the calibration result. The distribution of different spectral radiance has a great influence on the absolute radiometric calibration of the infrared device, and the gain factors of the device change the calibration result. Therefore, a calibration database is required to be established for absolute radiation calibration of various infrared spectrum radiometers, and a corresponding calibration data party is selected according to calibration conditions during actual test, so that high-precision test can be obtained.
At present, no relevant report of a method for calibrating a spectrum radiometer by adopting a high-temperature blackbody method at a wave band of 0.7-1.8 μm and establishing a database is seen.
Disclosure of Invention
Object of the invention
The purpose of the invention is that: aiming at the absolute radiation calibration measurement requirement of the spectrum radiometer, the establishment of the spectrum radiometer absolute radiation calibration device based on the high-temperature blackbody, a standard source database and a spectrum radiometer absolute radiation calibration database is provided.
(II) technical scheme
In order to solve the technical problem, the invention provides a spectrum radiometer absolute radiation calibration device based on a high-temperature blackbody, which comprises: the high-temperature blackbody (1) and the optical imaging system comprise a first plane reflector (2), an off-axis parabolic mirror (3), a second plane reflector (4) and a spectrum radiometer (5); after the spectrum radiation signal emitted by the high-temperature blackbody (1) reaches the off-axis parabolic mirror (3) after being reflected by the plane reflector (2), the output parallel light is received by the spectrum radiometer (5) after being reflected by the plane reflector (4), and the signal acquisition and the processing are carried out to give a measurement result; and the spectral radiance at different temperatures is obtained by adjusting the temperature of the high-temperature black body (1).
Wherein the high-temperature black body is 1273K-3100K (1).
The high-temperature black body (1) consists of a graphite tube black body cavity, a temperature-control radiation thermometer, a temperature controller, a power supply and a control cabinet, and is used as a standard radiation source to provide 1273K-3100K radiation standard.
When the calibration device works, the high-temperature blackbody (1) is opened to a set temperature and is stabilized, then a test is started, and the high-temperature blackbody (1) radiates a spectrum radiation signal which is received by an incidence slit of the spectrum radiometer (5).
The invention also provides a method for establishing the absolute radiation calibration database of the spectrum radiometer based on the high-temperature blackbody, wherein the method for establishing the database is carried out according to the absolute radiation calibration device of the spectrum radiometer based on the high-temperature blackbody, and comprises the steps of establishing a database for standard blackbody source calibration and a database for absolute radiation calibration results of the spectrum radiometer.
The establishment process of the standard blackbody source calibration database comprises the following steps: under darkroom environment, placing a high-temperature blackbody (1) and a spectrum radiometer (5) in a calibration light path of a calibration device, wherein the high-temperature blackbody (1) is used for providing standard spectrum radiation brightness output at different temperatures, and the spectrum radiometer (5) is used for measuring spectrum radiation brightness; the spectrum radiometer (5) and the high-temperature blackbody (1) are electrified and preheated, and the blackbody radiation temperature T is set i After the temperature of the high-temperature blackbody (1) is stable, calculating the temperature T according to the standard blackbody emissivity and the radiation temperature i The spectral radiance under, regard this value as the standard source database of the input standard value of the whole system; obtaining the next temperature point T according to the process i+1 And (3) establishing a standard source database according to the spectral radiance of the standard blackbody and different temperature conditions.
Wherein, in the process of establishing the database for standard blackbody source calibration, T i+1 ＝T i And (3) calculating a group of infrared spectrum radiation brightness corresponding to each radiation temperature of the infrared spectrum radiation standard source at the interval of 20K from 1273K to 3100K according to the Planckian formula, and establishing a standard blackbody source calibration database.
The Planckian formula for calculating the infrared spectrum radiation brightness of the high-temperature blackbody is as follows:
c 1 、c 2 is Planck constant, and is calculated by accurately testing the temperature T and emissivity epsilon of a high-temperature blackbodyAnd calculating to obtain the spectrum radiation brightness of the high-temperature blackbody at the temperature T.
The establishment process of the absolute radiation calibration result database of the spectrum radiometer comprises the following steps: opening the spectrum radiometer (5), setting initial parameters of the spectrum radiometer (5), setting an incident slit d of the spectrum radiometer (5), an integration time T and a radiation temperature T i Testing the spectral radiance of the high-temperature blackbody (1), and inputting the value serving as a standard value into a spectral radiometer absolute radiation calibration result database; the spectrum radiometer is obtained at the next temperature point T according to the process i+1 The absolute radiation calibration result database of the spectrum radiometer is established according to different temperatures, calibration conditions and the like; t (T) i+1 ＝T i +△T，△T＝20K。
(III) beneficial effects
The spectrum radiometer absolute radiation calibration device based on the high-temperature blackbody has the beneficial effects that:
(1) An optical imaging system formed by an off-axis parabolic mirror and two plane reflectors is used for receiving spectrum radiation signals at different temperatures by a spectrum radiometer;
(2) A standard source database is established, a group of spectral radiance corresponding to each radiant temperature of the high-temperature blackbody at intervals of 20K from 1273K to 3100K is calculated according to the Planckian formula, and the standard blackbody source calibration database is provided, so that the spectral radiance is reproduced with high accuracy.
(3) The absolute radiation calibration result database of the spectrum radiometer is established, and the calibration of the spectrum radiation brightness of the spectrum radiometer under different states in the conditions that the spectrum range covers 0.7-5 mu m, 1273-3100K and the interval is 20K is realized.
Drawings
FIG. 1 is a schematic diagram of the composition of the absolute radiometric calibration device of the high temperature blackbody-based spectroradiometer of the present invention.
FIG. 2 is a flow chart of the standard source database creation of the present invention.
FIG. 3 is a flow chart of the absolute radiometric calibration results database creation of the spectral radiometer of the present invention.
Detailed Description
To make the objects, contents and advantages of the present invention more apparent, the following detailed description of the present invention will be given with reference to the accompanying drawings and examples.
As shown in fig. 1, the spectral radiometer absolute radiation calibration device based on the high-temperature blackbody in the embodiment comprises a high-temperature blackbody 1 and an optical imaging system, wherein the optical imaging system comprises a first plane reflector 2, an off-axis parabolic mirror 3, a second plane reflector 4 and a spectral radiometer 5; after the spectrum radiation signal emitted by the high-temperature blackbody 1 reaches the off-axis parabolic mirror 3 after being reflected by the plane reflector 2, the output parallel light is received by the spectrum radiometer 5 after being reflected by the plane reflector 4, and the signal is collected and processed to give a measurement result; by adjusting the temperature of the high-temperature black body 1, the spectrum radiation brightness at different temperatures is obtained.
Wherein, the high temperature black body is 1273K-3100K high temperature black body with 1. The high-temperature black body 1 graphite tube black body cavity, the temperature control radiation thermometer, the temperature controller, the power supply and the control cabinet are used as standard radiation sources to provide 1273K-3100K radiation standard, and spectral radiation brightness is reproduced according to the Planckian formula to complete the calibration of spectral radiation brightness in the wave band of 0.7 mu m-5 mu m.
And opening the high-temperature blackbody 1, and starting the test after the high-temperature blackbody 1 reaches a set temperature and is stable, wherein the high-temperature blackbody 1 radiates a spectrum radiation signal which is received by an entrance slit of the spectrum radiometer 5.
The invention also provides a method for establishing a standard blackbody source calibration database and a spectrum radiometer absolute radiation calibration result database based on a high-temperature blackbody.
As shown in fig. 2, the establishment process of the standard blackbody source calibration database is as follows: in darkroom environment, placing the high temperature black body 1 and the spectrum radiometer 5 in a calibrating light path of a calibrating device, wherein the high temperature black body 1 is used for providing standard spectrum radiation brightness output at different temperatures, and lightThe spectral radiometer 5 is used for measurement of spectral radiance. Energizing and preheating the optical radiometer 5 and the high-temperature blackbody 1, and setting the blackbody radiation temperature T i After the temperature of the high-temperature blackbody 1 is stable, calculating the temperature T according to the standard blackbody emissivity and the radiation temperature i And taking the value as a standard source database of input standard values of the whole system. Obtaining the next temperature point T according to the steps i+1 Spectral radiance of standard blackbody (T i+1 ＝T i Δt, =20k), a standard source database is built according to different temperature conditions.
In the embodiment, according to the Planckian formula, a standard blackbody source calibration database is established according to a group of infrared spectrum radiation brightness corresponding to each radiation temperature of the calculated infrared spectrum radiation standard source at intervals of 20K from 1273K to 3100K.
Calculating the infrared spectrum radiation brightness of the high-temperature blackbody by using the Planck formula:
c 1 、c 2 the spectrum radiation brightness of the high-temperature black body at the temperature T can be calculated and obtained through accurate testing of the temperature T and the emissivity epsilon of the high-temperature black body.
As shown in fig. 3, the establishment process of the absolute radiation calibration result database of the spectrum radiometer is as follows: opening the spectrum radiometer 5, setting initial parameters of the spectrum radiometer 5, setting an incident slit d of the spectrum radiometer 5, integrating time T and a radiation temperature T i And then, testing the spectral radiance of the high-temperature blackbody 1, and inputting the value serving as a standard value into a spectral radiometer absolute radiation calibration result database. The spectrum radiometer is obtained at the next temperature point T according to the steps i+1 Absolute radiation calibration result (T) i+1 ＝T i And + [ delta ] T, [ delta ] T=20K), and establishing a spectral radiometer absolute radiation calibration result database according to different temperatures, calibration conditions and the like.
And after the spectrum radiation brightness of the high-temperature blackbody is known, obtaining a spectrum radiation brightness calibration result under the current condition according to the established mathematical model and the standard source database, and completing the spectrum radiation brightness tracing of the spectrum radiometer.
To accomplish the detection and radiation characteristic measurement of the target, the spectral radiometer needs to perform accurate radiometric calibration before development and external field use. Standard values at different temperatures can be selected according to the requirements during the calibration.
The foregoing is merely a preferred embodiment of the present invention, and it should be noted that modifications and variations could be made by those skilled in the art without departing from the technical principles of the present invention, and such modifications and variations should also be regarded as being within the scope of the invention.
Claims (10)
1. A high temperature blackbody-based absolute radiometric calibration device for a spectral radiometer, comprising: the high-temperature blackbody (1) and the optical imaging system comprise a first plane reflector (2), an off-axis parabolic mirror (3), a second plane reflector (4) and a spectrum radiometer (5); after the spectrum radiation signal emitted by the high-temperature blackbody (1) reaches the off-axis parabolic mirror (3) after being reflected by the plane reflector (2), the output parallel light is received by the spectrum radiometer (5) after being reflected by the plane reflector (4), and the signal acquisition and the processing are carried out to give a measurement result; and the spectral radiance at different temperatures is obtained by adjusting the temperature of the high-temperature black body (1).
2. The absolute radiometric calibration device of a high temperature blackbody-based spectrometer of claim 1, wherein the high temperature blackbody is (1) a 1273K-3100K high temperature blackbody.
3. The absolute radiation calibration device of the spectrum radiator based on the high-temperature blackbody according to claim 2, wherein the high-temperature blackbody (1) consists of a graphite tube black body cavity, a temperature-control radiation thermometer, a temperature controller, a power supply and a control cabinet, and is used as a standard radiation source to provide 1273K-3100K radiation standard.
4. A high temperature blackbody based spectral radiometer absolute radiation calibration device according to claim 3, wherein the calibration device is operative to open the high temperature blackbody (1) to a set temperature and to start the test after stabilization, the high temperature blackbody (1) radiating the spectral radiation signal for reception at the entrance slit of the spectral radiometer (5).
5. The method for establishing the database of the absolute radiation calibration of the spectrum radiator based on the high-temperature blackbody is characterized by comprising the steps of establishing a database for standard blackbody source calibration and a database of the absolute radiation calibration result of the spectrum radiator according to the high-temperature blackbody-based spectrum radiator calibration device of claim 4.
6. The method for building the database for calibrating the absolute radiation of the spectrum radiometer based on the high-temperature blackbody according to claim 5, wherein the standard blackbody source calibration database is built by the following steps: under darkroom environment, placing a high-temperature blackbody (1) and a spectrum radiometer (5) in a calibration light path of a calibration device, wherein the high-temperature blackbody (1) is used for providing standard spectrum radiation brightness output at different temperatures, and the spectrum radiometer (5) is used for measuring spectrum radiation brightness; the spectrum radiometer (5) and the high-temperature blackbody (1) are electrified and preheated, and the blackbody radiation temperature T is set i After the temperature of the high-temperature blackbody (1) is stable, calculating the temperature T according to the standard blackbody emissivity and the radiation temperature i The spectral radiance under, regard this value as the standard source database of the input standard value of the whole system; obtaining the next temperature point T according to the process i+1 And (3) establishing a standard source database according to the spectral radiance of the standard blackbody and different temperature conditions.
7. The method for creating the database for calibrating absolute radiation of high-temperature blackbody-based spectrometer as claimed in claim 6, wherein T is defined as the sum of the values of the standard blackbody source database i+1 ＝T i And (3) calculating the infrared spectrum radiation standard source according to the Planck formula at intervals of 20K from 1273K to 3100K when the delta T is equal to 20KAnd establishing a standard database for blackbody source calibration by a group of infrared spectrum radiation brightness corresponding to each radiation temperature.
8. The method for creating the absolute radiation calibration database of the high-temperature blackbody-based spectroradiometer according to claim 7, wherein the planck formula for calculating the infrared spectrum radiation brightness of the high-temperature blackbody is:
c 1 、c 2 the spectrum radiation brightness of the high-temperature black body at the temperature T is obtained through calculation by accurately testing the temperature T and the emissivity epsilon of the high-temperature black body.
9. The method for establishing the absolute radiation calibration data base of the spectrum radiometer based on the high-temperature blackbody according to claim 8, wherein the establishment process of the absolute radiation calibration result data base of the spectrum radiometer is as follows: opening the spectrum radiometer (5), setting initial parameters of the spectrum radiometer (5), setting an incident slit d of the spectrum radiometer (5), an integration time T and a radiation temperature T i Testing the spectral radiance of the high-temperature blackbody (1), and inputting the value serving as a standard value into a spectral radiometer absolute radiation calibration result database; the spectrum radiometer is obtained at the next temperature point T according to the process i+1 The absolute radiation calibration result database of the spectrum radiometer is established according to different temperatures, calibration conditions and the like; t (T) i+1 ＝T i +△T，△T＝20K。
10. Use of a method for establishing an absolute radiometric calibration database of a high temperature blackbody-based spectroradiometer according to any one of claims 5 to 9 in the field of optical metrology testing techniques.
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