CN110926600B - Equivalent response coefficient determination method for response characteristic of optical radiation sensor - Google Patents
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Abstract
The invention discloses an equivalent response coefficient determining method for response characteristics of an optical radiation sensor, which is used for testing the response characteristics of the optical radiation sensor by a laser light source instead of a wide-spectrum light source and determining light beam parameters of the laser light source according to the light beam parameters of the wide-spectrum light source; respectively carrying out response characteristic test on the plurality of optical radiation sensors on the wide-spectrum light source and the laser light source to respectively obtain corresponding test signals; obtaining equivalent response coefficients of different angle responses of the optical radiation sensor according to the test signals; and fitting the equivalent response coefficients of the angular responses of different optical radiation sensors to obtain the equivalent response coefficient of the laser light source replacing the broadband light source at any angle. The invention provides a theoretical basis for deduction and proof of response characteristics of the laser light source to the optical radiation sensor and a reference method for realizing the process, so that the response characteristics of the optical radiation sensor are tested by using the laser light source, and the defects of relatively large volume and power consumption, high cost and long preheating time of a wide-spectrum light source are overcome.
Description
Technical Field
The invention relates to the field of sensor performance test, in particular to a method for determining an equivalent response coefficient of response characteristics of an optical radiation sensor.
Background
Cosine error and azimuth error are both angle response errors of the optical incidence unit, the cosine error is the degree of deviation between the change characteristic along with the zenith angle on the hemispherical space of the description receiving plane and an ideal cosine curve, and the azimuth error is the nonuniformity describing the change along with the direction angle on the hemispherical space of the receiving plane. The cosine error and azimuth error characteristics are usually tested in conjunction with an angle measurement control system. The cosine and azimuth characteristics are tested and are often also called Angle response (Angle response) characteristics of the radiometer.
Light source systems adopted in the existing light radiation sensor angle response characteristic testing technology all adopt wide-spectrum light sources, such as short-arc xenon lamps or halogen tungsten lamps adopted by solar simulators. In actual production, the problems of relatively large volume and power consumption and relatively long preheating time of a light source mainly exist, and if a solar simulator is adopted as a light source system, the cost is relatively high.
Disclosure of Invention
Therefore, the invention provides a method for determining the equivalent response coefficient of the response characteristic of the optical radiation sensor, which is characterized in that the equivalent response coefficient of the wide-spectrum light source instead of the laser light source to the optical radiation sensor is determined, and the monochromatic laser light source is adopted to test the response characteristic of the optical radiation sensor, so that the defects of relatively large volume and power consumption, relatively long preheating time of the light source and high cost of the testing device in the prior art are overcome.
The embodiment of the invention provides a method for determining an equivalent response coefficient of response characteristics of an optical radiation sensor, which is used for testing the response characteristics of the optical radiation sensor by a laser light source instead of a wide-spectrum light source and comprises the following steps: determining the beam parameters of the laser light source according to the beam parameters of the wide-spectrum light source; respectively carrying out response characteristic test on the plurality of optical radiation sensors on the wide-spectrum light source and the laser light source to respectively obtain corresponding test signals; obtaining equivalent response coefficients of different angle responses of the optical radiation sensor according to the test signals; and fitting the equivalent response coefficients of the angular responses of different optical radiation sensors to obtain the equivalent response coefficient of the laser light source replacing the broadband light source at any angle.
In one embodiment, the step of determining beam parameters of the laser light source from beam parameters of the broad spectrum light source comprises: the output power of the laser light source is in the same order of magnitude as the replaced broadband light source; the wavelength of the laser light source is within the wavelength range of the replaced wide-spectrum light source; the divergence angle and uniformity of the output beam of the laser source is the same as the broadband light source that is replaced.
In an embodiment, the step of performing response characteristic tests on the plurality of optical radiation sensors respectively at the broad spectrum light source and the laser light source to respectively obtain corresponding test signals includes: and respectively carrying out response characteristic test on the plurality of optical radiation sensors under the laser light source and the wide-spectrum light source to respectively obtain angle response curves of the optical radiation sensors related to the incident angle under the laser light source and the wide-spectrum light source.
In one embodiment, greater than 10 angular positions are tested during the response characteristic test.
In one embodiment, the angles at which the response characteristic test is performed include at least normal and minimum lateral incidence values.
In one embodiment, the number of optical radiation sensors tested for response characteristics is greater than 5.
In one embodiment, the equivalent coefficients β (j) of the light sources with different angular responses of the optical radiation sensor are calculated by the following formula:
wherein, PWIs the output power of the wide-spectrum light source, Sw (i, j) is the test signal of the light radiation sensor under the wide-spectrum light source, Ps is the output power of the laser light source, N issFor the number of optical radiation sensors, i ═ 1.. Ns }, j ═ 1.. NθCorresponding angle theta1..θNθAnd (S, s) are test signals of the optical radiation sensor under the laser light source.
In an embodiment, the equivalent response coefficients of the angular responses of the different optical radiation sensors are fitted by using a least square method, so as to obtain the equivalent response coefficient β' (θ) of the laser light source replacing the broadband light source at any angle, where the fitting function is as follows:
wherein N isθFor the corresponding angle of each optical radiation sensor, β (θ) is the equivalent coefficient of the light source for different angular responses of the optical radiation sensor.
The technical scheme of the invention has the following advantages:
the method for determining the equivalent response coefficient of the response characteristic of the optical radiation sensor is used for testing the response characteristic of the optical radiation sensor by using the laser light source instead of the wide-spectrum light source, and determining the beam parameters of the laser light source according to the beam parameters of the wide-spectrum light source; respectively carrying out response characteristic test on the plurality of optical radiation sensors on the wide-spectrum light source and the laser light source to respectively obtain corresponding test signals; obtaining equivalent response coefficients of different angle responses of the optical radiation sensor according to the test signals; and fitting the equivalent response coefficients of the angular responses of different optical radiation sensors to obtain the equivalent response coefficient of the laser light source replacing the broadband light source at any angle. The invention provides a theoretical basis for deduction and proof of response characteristics of the laser light source to the optical radiation sensor and a reference method for realizing the process, so that the response characteristics of the optical radiation sensor are tested by using the laser light source, and the defects of relatively large volume and power consumption, high cost and long preheating time of a wide-spectrum light source are overcome.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of an example of a method for determining an equivalent response coefficient of a response characteristic of an optical radiation sensor according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
The embodiment of the invention provides a method for testing the response characteristic of an optical radiation sensor by using a monochromatic laser light source, aiming at the problems of large volume, large power consumption, long preheating time and the like of a wide-spectrum light source adopted in the existing optical radiation sensor angle response characteristic testing technology, and improves the prior art. According to the formula derivation of the response characteristic of the optical radiation sensor, for the test of the angle response characteristic, only one fixed coefficient beta related to the angle is different between the test result of the broadband light source and the test result of any monochromatic light source, and the monochromatic laser light source can be used for replacing the broadband light source to carry out the test only by determining the coefficient beta. The specific derivation process is as follows:
the response characteristic of the optical radiation sensor can be expressed in the form of a relative ratio of a parameter theta, which is an angle representing the zenith angle of incidence, and a function psi (theta), which is an integral of the wavelength lambda in the passband of the spectral response, as a function
Wherein, λ is the wavelength of incident light, and θ is the zenith angle of incidence, i.e. the angle between the incident light and the normal of the receiving surface. E (θ) is the irradiance at the incident angle θ, E (θ ═ 0) is the irradiance at normal incidence (i.e., at an angle of 0 degrees), S (θ, λ) is the raw signal value at the incident angle θ, S (θ ═ 0, λ) is the raw signal value at the incident angle 0, and R (θ, λ) and R (θ ═ 0, λ) are the sensitivity coefficients relating to the incident angle and wavelength, respectively.
According to the integral median theorem, if the function f (x) is satisfied to be continuous over the closed interval [ a, b ] and conductive in the open interval (a, b), then there is at least one point ε (a < ε < b) in (a, b), such that the following equation (2) holds:
in formula (1), the wavelength range [ lambda ] of the spectral response passband can be seton，λoff]Finding a wavelength lambda inεSo that the following holds:
when selecting any wavelength lambdaiAnd λεThe power is the same
E(θ，λi)＝E(θ，λε)，
R(θ，λε)S(θ，λε)＝R(θ，λi)S(θ，λi)，
R(θ＝0，λε)S(θ，λε)＝R(θ＝0，λi)S(θ，λi)，
It is possible to obtain:
wherein λεIs constant when a monochromatic laser source wavelength lambda is incidentiWhen determined, β is a constant related to θ only. Therefore, for the test of the angular response characteristic, the difference between the test result of the broadband light source and the test result of any monochromatic light source is only a fixed coefficient beta related to the angle.
The embodiment of the invention provides a method for determining an equivalent response coefficient of a response characteristic of an optical radiation sensor, which is used for testing the response characteristic of the optical radiation sensor by a laser light source instead of a wide-spectrum light source, and as shown in fig. 1, the method comprises the following steps:
step S1: and determining the beam parameters of the laser light source according to the beam parameters of the wide-spectrum light source.
In the embodiment of the invention, the method mainly comprises the following steps: the output power of the laser light source is in the same order of magnitude as the replaced broadband light source; the wavelength of the laser light source is within the wavelength range of the replaced wide-spectrum light source; the divergence angle and uniformity of the output beam of the laser source is the same as the broadband light source that is replaced.
Step S2: and respectively carrying out response characteristic test on the plurality of optical radiation sensors on the wide-spectrum light source and the laser light source to respectively obtain corresponding test signals.
In practical application, the optical radiation sensor can be a photoelectric sensor or a photo-thermal sensor, and different types of sensors correspond to different test signals.
In the embodiment of the invention, the response characteristic test is respectively carried out on the photoelectric sensors under the laser light source and the wide-spectrum light source, so that the angle response curves of the optical radiation sensors along with the incident angle under the laser light source and the wide-spectrum light source are respectively obtained. The number of the tested sensors and the number of the tested angles are only used as examples, but not limited to the examples, and in other embodiments, the number of the tested sensors and the number of the tested angles can be determined according to actual test environments and requirements.
Step S3: and obtaining equivalent response coefficients of different angle responses of the optical radiation sensor according to the test signals.
In the embodiment of the invention, the equivalent coefficients β (j) of the light sources with different angle responses of the optical radiation sensor are calculated by the following formula:
wherein, PWIs the output power of the wide-spectrum light source, Sw (i, j) is the test signal of the light radiation sensor under the wide-spectrum light source, Ps is the output power of the laser light source, N issFor the number of optical radiation sensors, i ═ 1.. Ns }, j ═ 1.. NθCorresponding angle theta1..θNθAnd (S, s) are test signals of the optical radiation sensor under the laser light source.
Step S4: and fitting the equivalent response coefficients of the angular responses of different optical radiation sensors to obtain the equivalent response coefficient of the laser light source replacing the broadband light source at any angle.
The embodiment of the invention uses least square to fit the equivalent response coefficients of the angle responses of different optical radiation sensors, and obtains the equivalent response coefficient beta' (theta) of the laser light source replacing the broadband light source under any angle, wherein the fitting function is as follows:
wherein N isθFor the corresponding angle of each optical radiation sensor, β (θ) is the equivalent coefficient of the light source for different angular responses of the optical radiation sensor.
Before obtaining the light source equivalent coefficients β (j) of the optical radiation sensor responding at different angles, the embodiment of the invention further comprises:
acquiring light source equivalent response coefficients of different sensors at different angles, and removing the light source equivalent response coefficients with deviation larger than a preset threshold, wherein the light source equivalent response coefficients beta (i, j) of the different sensors at different angles are as follows:
wherein, PWFor the output power of the wide-spectrum light source, Sw (i, j) is a test signal of the optical radiation sensor under the wide-spectrum light source, Ps is the output power of the laser light source, i ═ { 1.. Ns } is each optical radiation sensor, j ═ 1.. NθCorresponding angle theta1..θNθAnd (S, s) are test signals of the optical radiation sensor under the laser light source. By obtaining the equivalent response coefficients beta (i, j) of the light sources of different sensors at different angles, the deviation can be removedThe data with larger value enables the equivalent response coefficient of the laser light source replacing the broadband light source under any angle to be more accurate.
The method for determining the equivalent response coefficient of the response characteristic of the optical radiation sensor, provided by the embodiment of the invention, can determine the equivalent response coefficient of the response characteristic test of the optical radiation sensor by adopting the laser light source instead of the wide-spectrum light source, and provides a theoretical basis for derivation and proof and a reference method for realizing the process for the response characteristic of the laser light source to the optical radiation sensor, so that the response characteristic of the optical radiation sensor is tested by utilizing the laser light source, and the defects of relatively large volume and power consumption, high cost and long preheating time of the wide-spectrum light source are overcome.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.
Claims (8)
1. A method for determining equivalent response coefficient of response characteristic of optical radiation sensor is used for response characteristic test of laser light source to optical radiation sensor instead of wide spectrum light source, and is characterized by comprising the following steps:
determining the beam parameters of the laser light source according to the beam parameters of the wide-spectrum light source;
respectively carrying out response characteristic test on the plurality of optical radiation sensors on the wide-spectrum light source and the laser light source to respectively obtain corresponding test signals;
obtaining equivalent response coefficients of different angle responses of the optical radiation sensor according to the test signals, wherein the equivalent coefficients beta (j) of the light source of the optical radiation sensor with different angle responses are calculated by the following formula:
wherein, PWIs the output power of the wide-spectrum light source, Sw (i, j) is the test signal of the light radiation sensor under the wide-spectrum light source, Ps is the output power of the laser light source, N issFor the number of optical radiation sensors, i ═ 1.. Ns }, j ═ 1.. NθCorresponding angle theta1..θNθSs (i, j) is a test signal of an optical radiation sensor under the laser light source;
and fitting the equivalent response coefficients of the angular responses of different optical radiation sensors to obtain the equivalent response coefficient of the laser light source replacing the broadband light source at any angle.
2. The method of claim 1, wherein the step of determining the beam parameters of the laser source from the beam parameters of the broad spectrum source comprises:
the output power of the laser light source is in the same order of magnitude as the replaced broadband light source;
the wavelength of the laser light source is within the wavelength range of the replaced wide-spectrum light source;
the divergence angle and uniformity of the output beam of the laser source is the same as the broadband light source that is replaced.
3. The method for determining the equivalent response coefficient of the response characteristic of the optical radiation sensor according to claim 1, wherein the step of performing the response characteristic test on the plurality of optical radiation sensors respectively at the wide-spectrum light source and the laser light source to respectively obtain the corresponding test signals comprises:
and respectively carrying out response characteristic test on the plurality of optical radiation sensors under the laser light source and the wide-spectrum light source to respectively obtain angle response curves of the optical radiation sensors related to the incident angle under the laser light source and the wide-spectrum light source.
4. A method for determining the equivalent response coefficient of the response characteristic of an optical radiation sensor according to claim 3, characterized in that more than 10 angular positions are tested during the response characteristic test.
5. The method of claim 4, wherein the angle at which the response characteristic test is performed includes at least a vertical and a minimum lateral incidence value.
6. A method for determining the equivalent response coefficient of the response characteristic of an optical radiation sensor according to claim 3, characterized in that the number of optical radiation sensors tested for the response characteristic is greater than 5.
7. The method for determining the equivalent response coefficient of the response characteristic of the optical radiation sensor according to claim 1, wherein the method for fitting the equivalent response coefficients of the angular responses of the different optical radiation sensors by using a least square method is used to obtain the equivalent response coefficient β' (θ) of the laser light source replacing the broadband light source at any angle, and the fitting function is as follows:
wherein N isθFor the corresponding angle of each optical radiation sensor, β (θ) is the equivalent coefficient of the light source for different angular responses of the optical radiation sensor.
8. The method for determining equivalent response coefficients of response characteristics of an optical radiation sensor according to claim 1, wherein before obtaining equivalent coefficients β (j) of light sources of different angular responses of the optical radiation sensor, the method further comprises:
acquiring light source equivalent response coefficients of different sensors at different angles, and removing the light source equivalent response coefficients with deviation larger than a preset threshold, wherein the light source equivalent response coefficients beta (i, j) of the different sensors at different angles are as follows:
wherein, PWFor the output power of the wide-spectrum light source, Sw (i, j) is a test signal of the optical radiation sensor under the wide-spectrum light source, Ps is the output power of the laser light source, i ═ { 1.. Ns } is each optical radiation sensor, j ═ 1.. NθCorresponding angle theta1..θNθAnd (S, s) are test signals of the optical radiation sensor under the laser light source.
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| WO2020075442A1 (en) * | 2018-10-12 | 2020-04-16 | ウシオ電機株式会社 | Wideband extended pulsed light source, spectrometry device, and spectrometry method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102384761A (en) * | 2011-08-15 | 2012-03-21 | 西北核技术研究所 | Method for calibrating absolute spectral response ratio of photoelectric detector |
| CN105890754A (en) * | 2014-11-19 | 2016-08-24 | 中国科学院光电研究院 | Spectral imager integration calibration source system |
| CN105548854A (en) * | 2015-12-03 | 2016-05-04 | 江苏省无线电科学研究所有限公司 | Device for testing response time of photoelectric radiation sensor |
| WO2020075442A1 (en) * | 2018-10-12 | 2020-04-16 | ウシオ電機株式会社 | Wideband extended pulsed light source, spectrometry device, and spectrometry method |
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