Calibration method and calibration device for target radiation characteristic measurement equipment

Abstract

The present invention provides a calibration method and a calibration device for a target radiation characteristic measuring device, wherein the measuring device comprises: a compression component, a reflective mirror, a correction component, a detector and a cavity black body, wherein the method comprises: controlling the optical path where the compression component is located not to work, and controlling the radiation light emitted by the cavity black body to be emitted to the correction component through the reflective mirror and then incident on the detector for imaging, so as to perform internal calibration; controlling the diffuse reflection surface to cut into the front end of the target radiation characteristic measuring device, and the radiation light emitted by the cavity black body is compressed by the compression component and then incident on the diffuse reflection surface, and after diffuse reflection, returns to the detector through the reflective mirror and the correction component for imaging, so as to perform external calibration; calibrating the target radiation characteristic measuring device according to the internal calibration results and the external calibration results. The present invention integrates the cavity black body inside the target radiation characteristic measuring device, and can perform fast, wide dynamic periodic motorized calibration on the target radiation characteristic measuring device under the working environment and state.

Description

Technical Field

[0001] The present invention relates to the field of photometric measurement technology, and in particular to a calibration method and a calibration device for target radiation characteristic measuring equipment. Background Art

[0002] The application environment of target radiation characteristic measurement equipment (such as infrared detectors) includes land, sea, space, etc. Due to the complexity and diversity of its working environment, factors such as the movement and launch of the equipment with the vehicle, such as the space target radiation characteristic measurement equipment needs to withstand the harsh working conditions of high voltage and vibration during launch, and operate in orbit for a long time. During this period, it is affected by solar radiation and cosmic ion impact. The performance of the detector itself decays over time, and the performance of the optical system, mechanical structure, and electronic components changes, which reduces the accuracy of the radiation measurement data.

[0003] In order to maintain accurate measurement results of target radiation characteristic measurement, target radiation characteristic measurement needs to frequently check whether the calibration results meet the accuracy requirements. If not, recalibration is required. However, since the target radiation characteristic measurement equipment does not have laboratory conditions under field and space conditions, and the environmental conditions are harsh, the calibration in related technologies limits the calibration results of the measurement equipment, and can even only calibrate the internal back-end optical system of the target radiation characteristic measurement, and cannot complete the overall calibration, which seriously affects the use of target radiation characteristic measurement. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a calibration method for target radiation characteristic measuring equipment.

[0005] The invention also provides a calibration device for target radiation characteristic measuring equipment.

[0006] The technical solution adopted by the present invention is as follows:

[0007] The first aspect of the present invention provides a calibration method for a target radiation characteristic measurement device, wherein the target radiation characteristic measurement device comprises: a compression component, a reflective mirror, a correction component, a detector, and a cavity black body arranged corresponding to the reflective mirror, wherein the method comprises the following steps: controlling the optical path where the compression component is located not to work, and controlling the cavity black body to emit radiation light with a specific radiance, wherein the radiation light is emitted by the reflective mirror to the correction component for correction and then incident on the detector for imaging, so as to perform internal calibration; obtaining the incident radiance response rate α of the correction component according to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the internal calibration. n; Control the diffuse reflection surface to cut into the front end of the target radiation characteristic measurement device, the transflective mirror rotates 90°, the cavity black body emits a radiation light with a specific radiance, the radiation light is compressed by the compression component and then incident on the diffuse reflection surface, and after diffuse reflection, it returns to the detector through the transflective mirror and the correction component for imaging, so as to perform external calibration; according to the mathematical model of the target radiation characteristic measurement device during external calibration and the radiation response parameters, the incident radiance response rate α of the compression component is obtained w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw ; According to the incident radiance response rate α of the correction component n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw The target radiation characteristic measuring device is calibrated as a whole.

[0008] The calibration method of the target radiation characteristic measuring device proposed in the present invention also has the following additional technical features:

[0009] According to one embodiment of the present invention, the mathematical model of the internal calibration timing target radiation characteristic measurement device is obtained according to the following formula: DN = t × (α n ×τ l ×τ R ×L q + W zn )+DN dn ; Where DN is the grayscale value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, W zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn is the grayscale response error of the internal calibration timing detector.

[0010] According to one embodiment of the present invention, a mathematical model of an external calibration timing target radiation characteristic measurement device is obtained according to the following formula:

[0011] DN=t×[α W ×τ l ×τ R ×α n ×(τ T ×α q ×τM ×L q +L z )+W zw ]+DN dw ; Where DN is the grayscale value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

[0012] According to one embodiment of the present invention, the mathematical model of the external calibration timing target radiation characteristic measurement device further includes: Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

[0013] According to one embodiment of the present invention, the target radiation characteristic measurement device is calibrated as a whole according to the following formula:

[0014] α=α w ×τ R ×α n ×τ l ; Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, W zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

[0015] The second aspect of the present invention proposes a calibration device for a target radiation characteristic measurement device, wherein the target radiation characteristic measurement device comprises: a compression component, a reflective mirror, a correction component, a detector, and a cavity black body arranged corresponding to the reflective mirror, wherein the device comprises: an internal calibration module, wherein the internal calibration module is used to control the optical path where the compression component is located not to work, and to control the cavity black body to emit radiation light with a specific radiance, wherein the radiation light is emitted by the reflective mirror to the correction component for correction and then incident on the detector for imaging, so as to perform internal calibration, and the incident radiance response rate α of the correction component is obtained according to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the internal calibration. n ; An external calibration module, the external calibration module is used to control the diffuse reflection surface to cut into the front end of the target radiation characteristic measurement device, the transflective mirror rotates 90°, and the cavity black body is controlled to emit a radiation light with a specific radiance. The radiation light is compressed by the compression component and then incident on the diffuse reflection surface. After diffuse reflection, it is returned to the detector through the transflective mirror and the correction component for imaging, so as to perform external calibration. According to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the external calibration, the incident radiance response rate α of the compression component is obtained. w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw ; An overall calibration module, the overall calibration module is used to calibrate the incident radiance response rate α of the correction component n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw The target radiation characteristic measuring device is calibrated as a whole.

[0016] The calibration device of the target radiation characteristic measuring device of the present invention also has the following additional technical features:

[0017] According to an embodiment of the present invention, the internal calibration module obtains the mathematical model of the internal calibration timing target radiation characteristic measurement device according to the following formula:

[0018] DN=t×(α n ×τ l ×τ R ×L q +W zn )+DN dn ;

[0019] Among them, DN is the gray value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ l is the transmittance of the filter, τR is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, w zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn is the grayscale response error of the internal calibration timing detector.

[0020] According to an embodiment of the present invention, the external calibration module obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula:

[0021] DN=t×[α W ×τ l ×τ R ×α n ×(τ T ×α q ×τ M ×L q +L z )+W zw ]+DN dw ;

[0022] Among them, DN is the gray value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

[0023] According to an embodiment of the present invention, the external calibration module further obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula: Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

[0024] According to an embodiment of the present invention, the overall calibration module specifically performs overall calibration on the target radiation characteristic measurement device according to the following formula: α=α w ×τ R ×α n ×τ l ;

[0025] Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, W zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

[0026] The present invention has the following beneficial effects:

[0027] The present invention integrates a cavity blackbody into a target radiation characteristic measuring device, and can perform fast, wide-dynamic, periodic motorized calibration on the target radiation characteristic measuring device under a working environment and state. The calibration efficiency is high, which can not only improve the accuracy of the target radiation characteristic measurement data, but also save costs. After calibration, it can be used as a standard radiation source for other devices, and further serve as the basis for standard transfer. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a flow chart of a calibration method of a target radiation characteristic measurement device according to an embodiment of the present invention;

[0029] Figure 2 is a schematic structural diagram of a target radiation characteristic measuring device according to an embodiment of the present invention;

[0030] Figure 3 is a schematic diagram of the working state of an internal calibration timing target radiation characteristic measurement device according to an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a state in which radiation is emitted from a cavity black body to a diffuse reflection surface according to an embodiment of the present invention;

[0032] Figure 5 is a schematic diagram of a state in which diffuse reflection radiation from a diffuse reflection surface reaches a detector according to an embodiment of the present invention;

[0033] Figure 64 is a block diagram of a calibration device for a target radiation characteristic measurement device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] The following describes a calibration method and a calibration device for a target radiation characteristic measuring device provided in an embodiment of the present invention in conjunction with the accompanying drawings.

[0036] Figure 1 The present invention is a flowchart of a method for calibrating a target radiation characteristic measuring device according to an embodiment of the present invention. Figure 2 Schematic diagram of the structure of a target radiation characteristic measuring device according to an embodiment of the present invention.

[0037] like Figure 2 As shown, the target radiation characteristic measurement device includes: a compression component 1, a reflective mirror 2, a correction component 3, a detector 4 and a cavity black body 5 corresponding to the reflective mirror 2. The compression component 1 is the front-end optics, which is used to compress the incident light aperture to reduce the volume of the system, and the correction component 3 is the back-end optics, which is used to correct aberrations and improve imaging accuracy. During conventional imaging, that is, when the target radiation characteristic measurement device performs imaging detection, the cavity black body 5 does not work, the reflective mirror 2 is in the initial position, and the measurement device performs imaging detection. At this time, the mathematical model of the target radiation characteristic measurement device is:

[0038] DN=t×(α×L+W z )+DN d

[0039] =t×α×L+t×W z +DN d (1);

[0040] Where DN is the grayscale value output by the detector (imaging detector outputs image grayscale, non-imaging detector outputs electrical signal), t is the detector integration time, α is the response coefficient of the target radiation characteristic measurement device, L is the target radiance, W z is the system stray light radiance, DN d is the grayscale response caused by the dark current of the detector. Figure 2 The target radiation characteristic measurement device in the z and DN dThese three unknown quantities can complete the complete calibration of the target radiation characteristic measurement equipment.

[0041] like Figure 1 As shown, the calibration method of the target radiation characteristic measuring device proposed in the present invention includes steps S1-S5, S1-S2 is an internal calibration process, S3-S4 is an external calibration process, and S5 completes the overall calibration of the target radiation characteristic measuring device according to the internal calibration results and the external calibration results.

[0042] Step S1, control the optical path where the compression component is located not to work, and control the cavity black body to emit radiation light with a specific radiance. The radiation light is emitted to the correction component through a reflective mirror and then incident on the detector for imaging for internal calibration.

[0043] Specifically, the internal calibration is to measure the radiation response parameters of the rear-end optics (correction component 3). The working state of the target radiation characteristic measurement device during the internal calibration is as follows: Figure 3 As shown, the optical path where the compression component 1 is controlled not to work, and the cavity black body 5 is controlled to emit radiation light with a specific radiance. The radiation light is emitted to the correction component 3 through the reflector 2 for correction and then incident on the detector 4 for imaging for internal calibration.

[0044] Step S2, obtaining the incident radiance response rate α of the correction component according to the mathematical model and radiation response parameters of the internal calibration timing target radiation characteristic measurement device n .

[0045] Furthermore, in one embodiment of the present invention, a mathematical model of the internal calibration timing target radiation characteristic measurement device is obtained according to the following formula (2):

[0046] DN=t×(α n ×τ l ×τ R ×L q +W zn )+DN dn (2);

[0047] Among them, DN is the gray value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, W zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn It is the detector grayscale response error caused by the internal calibration timing detector dark current and the back-end processing electrical part.

[0048] Specifically, the radiation response parameters include: the gray value DN output by the detector, the radiance L of the cavity blackbody q , DN is the value detected during calibration, L q is the set value, τ l and τ R is the inherent parameter of the component, which can be tested or directly obtained from the component manual, that is, L q , DN, τ l and τ R is a known value, for the calibration value α n , W zn and DN dn , we only need to obtain the radiance of three sets of cavity black bodies and the grayscale value data of the detector output to obtain the incident radiance response rate α of the required correction component. n .

[0049] S3, control the diffuse reflection surface to cut into the front end of the target radiation characteristic measurement equipment, the reflective mirror rotates 90°, the cavity black body emits radiation light with a specific radiance, the radiation light is compressed by the compression component and then incident on the diffuse reflection surface, and after diffuse reflection, it returns to the detector through the reflective mirror and the correction component for imaging for external calibration.

[0050] S4, obtaining the incident radiance response rate α of the compression component according to the mathematical model and radiation response parameters of the external calibration timing target radiation characteristic measurement device w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw .

[0051] The establishment of the mathematical model of the external calibration timing target radiation characteristic measurement equipment is divided into the following two processes: ① and ②:

[0052] ① The process of emitting radiation from the cavity blackbody 5 to the diffuse reflection surface 6: Figure 4 As shown, the diffuse reflection surface 6 is controlled to cut into the front end of the target radiation characteristic measurement device, the reflective mirror 2 is rotated 90°, and the cavity black body 5 emits a radiation light with a specific radiance. The radiation light is compressed by the compression component 1 and then incident on the diffuse reflection surface 6. The radiance reflected by the diffuse reflection surface 6 is:

[0053] L M =τ T ×α q ×τ M ×L q +L z (3)

[0054] Among them, L M is the radiance reflected by the diffuse reflector, τ T is the transmittance of the transflective mirror, α qis the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L z is the stray light radiance, L q is the radiance of the cavity blackbody.

[0055] ② The process of diffuse reflection radiation from the diffuse reflection surface 6 to the detector 4: Figure 5 As shown, after the light is diffusely reflected by the diffuse reflection surface 6, it returns to the detector 4 through the reflective mirror 2 and the correction component 3 for imaging. The mathematical model of the external calibration timing target radiation characteristic measurement device is obtained according to the following formula (4):

[0056] DN=t×(α W ×τ l ×τ R ×α n ×L M +W zw )+DN dw (4)

[0057] Where t is the detector integration time, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, W zw is the detector response grayscale caused by internal stray radiation during external calibration, L M is the radiance reflected by the diffuse surface, α n To correct the incident radiance response rate of the component, DN dw Detector grayscale response error during external calibration.

[0058] Substituting formula (3) into formula (4) can obtain the mathematical model of the external calibration timing target radiation characteristic measurement equipment, that is, formula (5):

[0059] DN=t×[α W ×τ l ×τ R ×α n ×(τ T ×α q ×τ M ×L q +L z )+W zw ]+DN dw (5)

[0060] Among them, DN is the gray value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, αn is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

[0061] t, τ T , τ R and τ M It is the inherent parameter of the component, which can be directly obtained by testing or according to the corresponding component manual. N , L q It is known that for the calibration value α q ×α W , W zw and DN dw The required α can be obtained by obtaining the radiance of multiple sets of cavity black bodies and the grayscale value data of the detector output. q ×α W , W zw and DN dw .

[0062] α q With α W are the incident and outgoing radiance transmittances of the same optical system (median compression component of the present invention), respectively. For an optical system with known parameters, the image plane irradiance is:

[0063]

[0064] Where Ω is the solid angle, τ opt is the transmittance of the optical system, θ is the incident angle, which is generally small in such systems, L0 is the target radiance, A is the focal plane pixel size, D is the entrance pupil diameter, and f is the focal length.

[0065] For the same optical system, when emitting light, the entrance pupil diameter becomes the exit pupil diameter. When the optical system parameters are known, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

[0066] From the above, it can be concluded that the mathematical model of the external calibration timing target radiation characteristic measurement equipment also includes:

[0067]

[0068] Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

[0069] Substituting formula (7) into formula (6), the final required α can be obtained through calibration: w , W zw and DN dw .

[0070] S5, according to the incident radiance response rate α of the correction component n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw Perform overall calibration on the target radiation characteristic measurement equipment.

[0071] Specifically, α, W z and DN d is the calibration value required, where α needs to be obtained by combining the internal calibration result and the external calibration result, that is, α = α w ×τ R ×α n ×τ l , α n is obtained in step S2, α w As obtained in step S4, τ R and τ l is a known value, so the results of steps S2 and S4 can be used to calibrate the response coefficient α of the target radiation characteristic measurement device. The detector dark current and stray light of the target radiation characteristic measurement device in the imaging state and the external calibration state are slightly different. Therefore, W is directly obtained according to the external calibration state (steps S3-S4). zw DN dw Obtain the system stray light radiance W of the target radiation characteristic measurement device z and the grayscale response DN caused by the detector dark current d ,Right now

[0072] In summary, the target radiation characteristic measurement equipment is calibrated as a whole according to the following formulas (8)-(9):

[0073] α=α w ×τ R ×α n ×τ l (8)

[0074]

[0075] Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, W zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

[0076] Therefore, all parameters in formula (1) have been confirmed, and the complete calibration of the target radiation characteristic measurement equipment has been completed.

[0077] In the present invention, wide dynamic calibration of the target radiation characteristic measurement system is achieved by changing the attenuation sheet and the detector integration time. When the internal cavity blackbody radiation source is internally calibrated, the internal calibration can be completed when the rear optical system has a high transmittance, a small attenuation, and a low temperature of the radiation source. When performing external calibration, the radiation emitted by the radiation source is reflected by the diffuse reflection surface, passes through the front optical system twice, and finally reaches the detector through the rear optical system, requiring a higher temperature. The temperature range of the internal cavity blackbody is determined by the measurement radiation range of the target radiation characteristic measurement system, the detector, and the optical system parameters.

[0078] In summary, according to the calibration method of the target radiation characteristic measuring device in an embodiment of the present invention, the cavity blackbody is integrated into the target radiation characteristic measuring device, and the target radiation characteristic measuring device can be calibrated quickly and periodically with wide dynamic range under the working environment and state. The calibration efficiency is high, which can not only improve the accuracy of the target radiation characteristic measurement data, but also save costs. After calibration, it can be used as a standard radiation source for other devices, and then as the basis for standard transfer.

[0079] Corresponding to the calibration method of the above-mentioned target radiation characteristic measuring equipment, the present invention also proposes a calibration device for the target radiation characteristic measuring equipment. Since the device embodiment of the present invention corresponds to the above-mentioned method embodiment, the details not disclosed in the device embodiment can be referred to the above-mentioned method embodiment, and will not be repeated in the present invention.

[0080] Figure 6 is a block diagram of a calibration device for a target radiation characteristic measurement device according to an embodiment of the present invention, wherein Figure 2As shown, the target radiation characteristic measurement device includes: a compression component 1, a reflective mirror 2, a correction component 3, a detector 4 and a cavity black body 5 arranged corresponding to the reflective mirror 2. The compression component 1 is the front-end optics, which is used to compress the incident light aperture to reduce the volume of the system, and the correction component 3 is the back-end optics, which is used to correct aberrations and improve imaging accuracy. Figure 6 As shown, the device includes: an internal calibration module 10, an external calibration module 20 and an overall calibration module 30.

[0081] The internal calibration module 10 is used to control the optical path where the compression component is located to not work, and to control the cavity black body to emit radiation light with a specific radiance. The radiation light is emitted to the correction component through the reflector and then incident on the detector for imaging, so as to perform internal calibration. The incident radiance response rate α of the correction component is obtained according to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the internal calibration. n The external calibration module 20 is used to control the diffuse reflection surface to cut into the front end of the target radiation characteristic measurement device, rotate the reflective mirror 90°, control the cavity black body to emit radiation light with a specific radiance, and the radiation light is compressed by the compression component and incident on the diffuse reflection surface. After diffuse reflection, it returns to the detector through the reflective mirror and the correction component for imaging, so as to perform external calibration. According to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during external calibration, the incident radiance response rate α of the compression component is obtained. w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw The overall calibration module 30 is used to calibrate the incident radiance response rate α of the component according to the incident radiance response rate α n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw Perform overall calibration on the target radiation characteristic measurement equipment.

[0082] According to one embodiment of the present invention, the internal calibration module obtains the mathematical model of the internal calibration timing target radiation characteristic measurement device according to the following formula:

[0083] DN=t×(α n ×τ l ×τ R ×L q +W zn )+DN dn .

[0084] Among them, DN is the gray value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ lis the transmittance of the filter, τ R is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, W zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn is the grayscale response error of the internal calibration timing detector.

[0085] According to an embodiment of the present invention, the external calibration module obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula:

[0086] DN=t×[α W ×τ l ×τ R ×α n ×(τ T ×α q ×τ M ×L q +L z )+W zw ]+DN dw ;

[0087] Among them, DN is the gray value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

[0088] According to an embodiment of the present invention, the external calibration module further obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula:

[0089]

[0090] Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

[0091] According to one embodiment of the present invention, the overall calibration module performs overall calibration on the target radiation characteristic measurement device according to the following formula:

[0092] α=α w ×τ R ×α n ×τ l ;

[0093]

[0094] Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, W zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

[0095] In summary, according to the calibration device of the target radiation characteristic measuring equipment in the embodiment of the present invention, the cavity blackbody is integrated into the target radiation characteristic measuring equipment, and the target radiation characteristic measuring equipment can be calibrated quickly and periodically with wide dynamic range in the working environment and state. The calibration efficiency is high, which can not only improve the accuracy of the target radiation characteristic measurement data, but also save costs. After calibration, it can be used as a standard radiation source for other equipment to use, and then serve as the basis for standard transfer.

[0096] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. "Multiple" means two or more, unless otherwise clearly and specifically defined.

[0097] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0098] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present invention belong.

[0099] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0100] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0101] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0102] In addition, each functional unit in each embodiment of the present invention may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0103] The storage medium mentioned above can be a read-only memory, a magnetic disk or an optical disk, etc.

[0104] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A calibration method for a target radiation characteristic measurement device, characterized in that: The target radiation characteristic measuring device comprises: a compression component, a transflective mirror, a correction component, a detector, and a cavity black body arranged corresponding to the transflective mirror, and the method comprises the following steps: The optical path where the compression component is located is controlled not to work, and the cavity black body is controlled to emit radiation light with a specific radiance, and the radiation light is emitted to the correction component through the reflective mirror and then incident on the detector for imaging, so as to perform internal calibration; The incident radiance response rate α of the correction component is obtained according to the mathematical model and radiation response parameters of the internal calibration timing target radiation characteristic measurement device. n ; The diffuse reflection surface is controlled to cut into the front end of the target radiation characteristic measurement device, the transflective mirror is rotated 90 degrees, the cavity black body emits radiation light with a specific radiance, the radiation light is compressed by the compression component and then incident on the diffuse reflection surface, and after diffuse reflection, it is returned to the detector through the transflective mirror and the correction component for imaging, so as to perform external calibration; The incident radiance response rate α of the compression component is obtained according to the mathematical model and radiation response parameters of the external calibration timing target radiation characteristic measurement device. w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw ; According to the incident radiance response rate α of the correction component n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw The target radiation characteristic measuring device is calibrated as a whole.

2. The calibration method of target radiation characteristic measurement equipment according to claim 1, characterized in that: The mathematical model of the internal calibration timing target radiation characteristic measurement device is obtained according to the following formula: DN=t×(α n ×τ l ×τ R ×L q +W zn )+DN dn ; Among them, DN is the gray value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, W zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn is the grayscale response error of the internal calibration timing detector.

3. The calibration method of target radiation characteristic measurement equipment according to claim 1, characterized in that: The mathematical model of the external calibration timing target radiation characteristic measurement device is obtained according to the following formula: DN=t×[α W ×t l ×t R ×a n ×(t T ×a q ×t M ×L q ×L z )+W zw ]+DN dw ; Among them, DN is the gray value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

4. The calibration method of target radiation characteristic measurement equipment according to claim 3, characterized in that: The mathematical model of the external standard timing target radiation characteristic measurement equipment also includes: Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

5. The calibration method of target radiation characteristic measurement equipment according to claim 1, characterized in that: Specifically, the target radiation characteristic measurement equipment is calibrated as a whole according to the following formula: a = a w ×t R ×a n ×t l ; Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, W zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

6. A calibration device for a target radiation characteristic measuring device, characterized in that: The target radiation characteristic measuring device comprises: a compression component, a reflective mirror, a correction component, a detector and a cavity black body arranged corresponding to the reflective mirror, and the device comprises: The internal calibration module is used to control the optical path where the compression component is located to not work, and control the cavity black body to emit radiation light with a specific radiance. The radiation light is emitted to the correction component through the reflector and then incident on the detector for imaging, so as to perform internal calibration. According to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the internal calibration, the incident radiance response rate α of the correction component is obtained. n ; An external calibration module is used to control the diffuse reflection surface to cut into the front end of the target radiation characteristic measurement device, the transflective mirror is rotated 90 degrees, and the cavity black body is controlled to emit radiation light with a specific radiance. The radiation light is compressed by the compression component and then incident on the diffuse reflection surface. After diffuse reflection, it is returned to the detector through the transflective mirror and the correction component for imaging, so as to perform external calibration. According to the mathematical model of the target radiation characteristic measurement device and the radiation response parameters during the external calibration, the incident radiance response rate α of the compression component is obtained. w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw ; An overall calibration module, the overall calibration module is used to calibrate the incident radiance response rate α of the correction component according to the incident radiance response rate α of the correction component. n , the incident radiance response rate of the compression component α w , the detector response grayscale W caused by internal stray radiation during external calibration zw The grayscale response error DN of the detector during external calibration dw The target radiation characteristic measuring device is calibrated as a whole.

7. The calibration device for target radiation characteristic measurement equipment according to claim 6, characterized in that: The internal calibration module specifically obtains the mathematical model of the internal calibration timing target radiation characteristic measurement device according to the following formula: DN=t×(α n ×τ l ×τ R ×L q +W zn )+DN dn ; Among them, DN is the gray value output by the detector, t is the detector integration time, α n is the incident radiance response rate of the correction component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, L q is the radiance of the cavity blackbody, W zn Grayscale of detector response caused by internal stray radiation during internal calibration, DN dn is the grayscale response error of the internal calibration timing detector.

8. The calibration mold device of the target radiation characteristic measurement equipment according to claim 6, characterized in that: The external calibration module specifically obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula: DN=t×[α W ×t l ×a n ×(t T ×a q ×t M ×L q +L z )+W zw ]+DN dw ; Among them, DN is the gray value output by the detector, t is the detector integration time, α w is the incident radiance response rate of the compression component, τ l is the transmittance of the filter, τ R is the reflectivity of the transflective mirror, α n is the incident radiance response rate of the correction component, τ T is the transmittance of the transflective mirror, α q is the outgoing radiance transmittance of the compression component, τ M is the diffuse reflectivity of the diffuse reflection surface, L q is the radiance of the cavity blackbody, L z is the stray light radiance, W zw is the detector response grayscale caused by internal stray radiation during external calibration, DN dw This is the grayscale response error of the detector during external calibration.

9. The calibration module of the target radiation characteristic measurement device according to claim 8, characterized in that: The external calibration module also obtains the mathematical model of the external calibration timing target radiation characteristic measurement device according to the following formula, and further includes: Among them, α w is the incident radiance response rate of the compression component, α q is the outgoing radiance transmittance of the compressed component, D 入 is the entrance pupil diameter of the compression component, D 出 is the exit pupil diameter of the compression component.

10. The calibration device for target radiation characteristic measurement equipment according to claim 6, characterized in that: The overall calibration module specifically performs overall calibration on the target radiation characteristic measurement device according to the following formula: a = a w ×t R ×a n ×t l ; Among them, α is the response coefficient of the target radiation characteristic measurement equipment, α w is the incident radiance response rate of the compression component, τ R is the reflectivity of the transflective mirror, τ l is the transmittance of the filter, DN d is the grayscale response caused by the detector dark current, DN dw is the grayscale response error of the detector during external calibration, V zw is the detector response grayscale caused by internal stray radiation during external calibration, W z is the stray light radiance.

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