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Multispectral noise equivalent temperature difference testing device and method

A noise-equivalent temperature difference and testing device technology, applied in the field of optical detection, can solve the problems that cannot be used to evaluate the detection ability, and achieve the effect of eliminating systematic errors, suppressing the influence of random errors, and suppressing direct thermal radiation on the detector

Active Publication Date: 2020-04-10
HENAN NORMAL UNIV
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Problems solved by technology

[0009] Traditional NETD measurement devices are used to measure NETD in a certain wide-band range, and the black body temperature is usually at room temperature, which cannot be used to evaluate the performance of atmospheric infrared radiation measurement systems for astronomical site selection, gas infrared spectroscopy for environmental monitoring, etc. detection capability

Method used

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  • Multispectral noise equivalent temperature difference testing device and method

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Embodiment 1

[0047] Using the above method, the NETD of a single pixel and multiple pixels averaged was tested. During the test, the temperature of the surface source blackbody was 22°C, the acquisition time was 18 minutes, and 20,000 frames of spectral data were collected continuously. The specific acquisition results are as follows figure 2 shown by figure 2 The 22°C black body in 18 minutes continuously collects the results, and the standard deviation σ can be calculated;

[0048] According to the operation in step 4, collect data at 11 temperature points, collect 80 frames of data at each temperature point, and fit the data. The specific fitting results are as follows image 3 shown, according to image 3 dS / dT can be calculated from the Planck function fitting results at multiple temperature points;

[0049] Based on the above data, the value of NETD can be obtained as shown in Table 1.

[0050]

[0051] Table 1: NETD results after single pixel and multi-pixel averaging

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Abstract

The invention discloses a multispectral noise equivalent temperature difference testing device. The multispectral noise equivalent temperature difference testing device comprises a surface source black body, a circular variable optical filter wheel is arranged in the radiation light transmission direction of the surface source black body, an off-axis hyperboloid reflector is arranged on one side of the circular variable optical filter wheel in the light transmission direction, and an off-axis parabolic reflector is arranged on one side of the off-axis hyperboloid reflector in the light transmission direction; the surface source black body coincides with the focal point of the off-axis parabolic mirror through the virtual image point of the off-axis hyperboloid mirror. A Fourier spectrometer is arranged on one side of the off-axis parabolic mirror in the light transmission direction. The invention also discloses a test method. The device provided by the invention has a self-calibrationfunction, can correct the transmittance and background radiation of the optical element of the test system at any time, and eliminates system errors. According to the device and method, the Planck function is used for replacing a polynomial to fit the data, the physical significance is clearer, the influence of random errors in the testing process is restrained, and the device and method has the advantages in NETD testing of a small-dynamic-range system.

Description

technical field [0001] The invention belongs to the technical field of optical detection, and in particular relates to a multispectral noise equivalent temperature difference testing device and method. Background technique [0002] The noise equivalent temperature difference is an index that can objectively evaluate the comprehensive performance of the infrared system. According to the test results of the noise equivalent temperature difference, the operating distance of the space infrared target detection system can be estimated, and the performance of the ground-based large-aperture infrared astronomical telescope on a selected station can also be evaluated. The limit star magnitude of the site has very important national defense and scientific significance. [0003] The measurement of Noise Equivalent Temperature Difference (NETD) requires a laboratory black body with known radiance. There are two main methods, and the measurement principles are as follows: [0004] 1) T...

Claims

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Application Information

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IPC IPC(8): G01J5/00
CPCG01J5/00G01J5/80
Inventor 赵志军周海静许方宇罗永芳郭杰
Owner HENAN NORMAL UNIV
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