16.5 Calibration and Special Testing
547
Table 16.12 Calibration and special tests of monitoring camera
Tests
Purpose
Interior orientation elements calibration To measure the optical distortion coefficient, pixel
position, focal length and optical axis offset
Flat fielding calibration
To measure inconsistent response of pixel and channel
Absolute radiation calibration
To establish the quantitative relationship between the
camera output signal and the radiance of the target
Sill imaging
To evaluate the still image quality at different lighting
and imaging distance
Video test
To evaluate the image quality of dynamic camera at
different lighting and imaging distance
Automatic exposure test
To evaluate the function of automatic exposure image
under different light intensity
Image compression test
To evaluate image quality difference and data rate
before and after compression
Lunar dust occlusion test
To evaluate the imaging quality under different dust
cover
Color calibration
To obtain white balance correction matrix and color
correction matrix
16.5.5 Calibration and Special Testing of Monitoring Camera
1. Tests
The calibration and special testing of monitoring camera are listed in Table 16.12.
2. Test Principle and Method
The principle and method of monitoring camera calibration and special tests cold
refer to similar tests of descent camera and morphology camera.
16.5.6 Calibration and Special Testing of Lunar Dust
Detector
1. Tests
The calibration and special testing of lunar dust detector are listed in Table 16.13.
2. Test Principle and Method
1) Principle and method of SQCM detector calibration
The SQCM detector calibration was to measure the frequency and drift range of
SQCM detector under different lunar dust accumulation mass, and to establish the
relationship between the crystal oscillator frequency and the lunar dust accumulation
mass.