Jing MA, Fu-nan ZHU, Yan-ping ZHOU, et al. Detection device of optical surface pollution for satellite and ground[J]. Optics and precision engineering, 2016, 24(8): 1878-1883.
DOI:
Jing MA, Fu-nan ZHU, Yan-ping ZHOU, et al. Detection device of optical surface pollution for satellite and ground[J]. Optics and precision engineering, 2016, 24(8): 1878-1883. DOI: 10.3788/OPE.20162408.1878.
Detection device of optical surface pollution for satellite and ground
For the surface pollution of an optical communication terminal
a 10 MHz Aluminized Quartz Crystal Microbalance (QCM) is developed to detect the amount of deposited pollution in real time during a vacuum test. By introducing a reference crystal
the QCM eliminates the influence of environmental factors substantially
and reduces the requirements for temperature accuracy and its theoretical mass sensitivity is up to 10
-9
g/cm
2
. Through an absolute calibration experiment
the practical mass sensitivity of the QCM is 10
-8
g/cm
2
shows a lower cost and good practicability and can be used both in satellites and on the ground. According to different operating temperatures of pollution sources
the test is divided into 32 ℃ constant temperature segment
32 ℃ to -27 ℃ cooling segment
cryostat segment and -2 ℃ to 32 ℃ heating segment. The results show that in the high temperature segment at begin
the temperature difference between pollution source and sensitive surface is above 0 ℃
and the amount of pollution deposition per unit area is 1.68×10
-4
g/cm
2
in 15.75 h. In the cryostat segment
the temperature difference is below -22 ℃
the amount of desorption per unit area is 1.08×10
-4
g/cm
2
in 23.37 h. Moreover
the total amount of deposition is 2.7×10
-5
g/cm
2
in the vacuum test. These results confirm the validity of the QCM for detecting the amount of pollution deposition
analyze the deposition process under vacuum test preliminarily and provide a gist for predicting and preventing the pollution of optical surfaces.
关键词
Keywords
references
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