Temperature measurement and calibration platform in space vacuum environment

Abstract

The invention relates to a temperature measurement and calibration platform in space vacuum environment. The temperature measurement and calibration platform is favorable for realizing the simultaneous calibration of contact type temperature measurement and non-contact type temperature measurement, so the temperature measurement and calibration platform is served for heat vacuum and heat balance experiments of spacecrafts such as satellites, spaceship and the like. The temperature measurement and calibration platform comprises a constant temperature bath, wherein a double-sub-cavity vacuum cavity, the double-sub-cavity vacuum cavity comprises a first vacuum cavity body and a second vacuum cavity body, the first vacuum cavity body and the second vacuum cavity body are connected with a vacuum pumping device through a three-way valve, standard temperature indicator sensors are respectively arranged on the outer wall of the first vacuum cavity body and on the outer wall of the second vacuum cavity body, the standard temperature indicator sensors are connected with a temperature secondary meter, a laser light path reflecting device is arranged in the vacuum cavity of the first vacuum cavity body for calibrating a non-contact type temperature measuring system based on the tunable diode laser absorption spectrum technology, and the vacuum cavity of the second vacuum cavity body is used for accommodating a temperature sensor for calibrating a contact type temperature measuring system adopting the temperature sensor.

Description

technical field [0001] The invention relates to a temperature measurement and calibration technology in a vacuum environment, in particular to a temperature measurement and calibration platform in a space vacuum environment. The use of the platform is conducive to solving the traceability problem of temperature measurement in vacuum, and realizes the simultaneous calibration of contact temperature measurement and non-contact temperature measurement, thereby serving the thermal vacuum and thermal balance tests of spacecraft such as satellites and spaceships. Background technique [0002] In order to verify the correctness of satellite thermal design and ensure the reliable operation of satellites in space orbit, space thermal environment simulation experiments must be carried out in the process of satellite development. The simulated space thermal environment on the ground is the basic condition for realizing the thermal test. In the thermal vacuum test, the temperature of re...

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Problems solved by technology

Although TDLAS technology has made significant progress in the measurement of gas temperature and concentration, and realized high-precision online measurement of gas temperature and concentration in various environments, it is regrettable that the current research on TDLAS technology is mainly aimed at specific engineering applications. The pressure range of its research is generally concentrated in the range of 0.1kPa to 1000kPa. Few researchers try to measure the temperature and concentration of gas in a high-vacuum environment. The main reasons for this are the following two points: First, the current TDLAS technology mainly For specific engineering applications, and engineering applications generally rarely involve extremely low pressure conditions; second, TDLAS technology obtains the temperature and concentration of the gas by analyzing the absorption of the gas to the laser, but in a vacuum environment, the gas per unit volume The number of molecules is very small, so that the absorption signal is very weak, which is not conducive to experimental measurement

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