Method for monitoring sensitive low-temperature surface pollution of spacecrafts

A surface contamination and spacecraft technology, applied in the aerospace field, can solve the problems of non-metallic material outgassing or plume jet deposits that cannot be characterized, and achieve stable and reliable test process, clean environmental conditions, and good repeatability. Effect

Active Publication Date: 2010-11-03
NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the deposition amount of non-metallic material outgassing or plume jet deposits on the low-temperature sensitive surface cannot be characterized in my country's existing spacecraft during the thermal vacuum test and on-orbit operation of the spacecraft. Method for bit-by-bit monitoring of non-metallic material outgassing pollutants or spacecraft plume pollutants on low-temperature sensitive surfaces of spacecraft

Method used

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  • Method for monitoring sensitive low-temperature surface pollution of spacecrafts
  • Method for monitoring sensitive low-temperature surface pollution of spacecrafts

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Embodiment

[0031] 1) The test sample is a space-grade silicone rubber material often used by spacecraft, which is prepared into a granular shape of 1mm×1mm×1mm, 100g is loaded into the thermal control sample stage 4, and the angle of view of the quartz crystal microbalance detector 6 is adjusted to the angle of the sample. 180°, connect relevant water, electricity and gas auxiliary equipment, adjust the balance communication, and close the vacuum chamber 3;

[0032] 2) Turn on the vacuum pumping system, start the cold trap, start the mechanical pump, and start the molecular pump until the vacuum degree of the system is less than 1×10 -3 Pa;

[0033] 3) Turn on the liquid nitrogen refrigeration system 5, and monitor the temperature change of the quartz crystal microbalance until the surface temperature of the quartz crystal microbalance is 80K;

[0034] 4) The thermal control sample stage 4 is controlled by the computer 7, the space-grade silicone rubber material is heated to 125°C for 2...

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Abstract

The invention relates to a method for monitoring sensitive low-temperature surface pollution of spacecrafts, in particular to a method for monitoring sensitive low-temperature surface pollution of spacecrafts by utilizing a quartz crystal microbalance, belonging to the technical field of aerospace. The method is directly applied to monitoring surface pollution of infrared low-temperature remote sensors and other low-temperature space probes. The method is characterized by utilizing a liquid nitrogen refrigeration system and quartz wafers to simulate the sensitive low-temperature surfaces of the spacecrafts; lowering the surface temperature of the quartz crystal by the liquid nitrogen refrigeration system to ensure the quartz crystal to work under the worst temperature on the spacecraft orbit; heating non-metal materials or ensuring an engine to ignite to ensure the non-metal materials or the engine to effuse or jet pollutants; carrying out online in-situ monitoring on the frequency and temperature of the quartz crystal microbalance and storing the frequency and temperature; and closing a test system. The method is high in sensitivity (1.10*10<-9>-4.42*10<-9>), stable and reliable in test process, good in repeatability and suitable for large-scale test.

Description

technical field [0001] The invention relates to a method for monitoring the pollution of the sensitive low-temperature surface of a spacecraft, especially a method for monitoring the pollution of the low-temperature sensitive surface of a spacecraft by using a quartz crystal microbalance, which belongs to the field of aerospace technology and is directly applied to infrared low-temperature remote sensing and other aerospace low-temperature detectors Surface contamination monitoring. Background technique [0002] There are many sensitive components on the spacecraft (such as optical lenses, observation windows, solar cell covers, thermal control coatings, relay contacts, inner walls of waveguides, etc.) that require pollution monitoring and control. Although these sensitive surfaces have certain pollution control measures in the process of parts manufacturing, sub-system assembly, and final assembly, they may still suffer from varying degrees of pollution during spacecraft gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N5/00
Inventor 颜则东王先荣王鷁姚日剑柏树冯杰
Owner NO 510 INST THE FIFTH RES INST OFCHINA AEROSPAE SCI & TECH
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