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Method for measuring temperature in vacuum environment based on wavelength modulation spectrum technology

A technology of wavelength modulation spectrum and vacuum environment, which is applied in optical radiation measurement, radiation pyrometry, measuring devices, etc., can solve the problems of surface material analysis temperature traceability, etc., and achieve the effect of small measurement error and high precision

Inactive Publication Date: 2013-09-18
TSINGHUA UNIV
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Problems solved by technology

[0004] In order to solve the problems of surface material analysis and temperature traceability in the measurement of vacuum environment temperature by traditional contact temperature sensors, the purpose of this invention is to establish a temperature measurement method in vacuum environment based on wavelength modulation spectroscopy technology

Method used

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  • Method for measuring temperature in vacuum environment based on wavelength modulation spectrum technology
  • Method for measuring temperature in vacuum environment based on wavelength modulation spectrum technology
  • Method for measuring temperature in vacuum environment based on wavelength modulation spectrum technology

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experiment example

[0050] 1) with C 2 h 2 As a temperature measurement medium, fill it into the vacuum chamber 8, put the vacuum chamber 8 into the constant temperature tank 16, let the temperature of the constant temperature tank 16 automatically drop from -10°C to -20°C, and use a first-class standard platinum resistance for comparison, from Select two characteristic spectral line pairs in the HITRAN spectral database, and their center frequencies are 6558.7925cm -1 and 6558.9156cm -1 ;

[0051] 2) Using the tunable semiconductor laser 6 as the light source, adjust the temperature and current of the laser controller 5, so that the output frequency of the tunable semiconductor laser 6 is stabilized at a frequency of 6558.8541cm -1 place, and use the wavelength meter 7 to calibrate and monitor;

[0052] 3) The 0.1Hz low-frequency square wave generated by the first signal generator 1, the 20Hz low-frequency triangular wave generated by the second signal generator 2 and the 5kHz high-frequency...

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Abstract

The invention discloses a method for measuring a temperature in a vacuum environment based on a wavelength modulation spectrum technology, and belongs to the technical field of tunable laser diode absorption spectroscopy. According to the method, a laser is modulated by utilizing a high-frequency sine wave, a low-frequency triangular wave and a low-frequency square wave based on the wavelength modulation spectrum technology, so that selected two temperature measurement spectral lines appear at a high level position and a low level position respectively; spectral line scanning is realized by the triangular wave; the second harmonic signal ratio of the two spectral lines is obtained by experimental measurement; the rotational temperature of gas molecules is determined by comparing the second harmonic signal ratio with a theoretical calculating value; and the rotational temperature and a translational temperature (the classical thermodynamic temperature) are kept balance all the time, so that the temperature of gas can be measured. By the method, the problems of surface material analysis and temperature traceability of a current contact temperature sensor applied in the vacuum environment are solved.

Description

technical field [0001] The invention relates to a method for measuring temperature in a vacuum environment, in particular to measuring the temperature in a vacuum environment based on the second harmonic method in the wavelength modulation spectrum technology. Background technique [0002] With the development of my country's aerospace science and technology, vacuum environment experiments, especially spacecraft vacuum thermal experiments, have become a very important experimental verification work, and temperature measurement in vacuum environments has become the key testing technology for the above research. But so far, the measurement of temperature in the vacuum thermal test of spacecraft basically uses traditional contact temperature sensors, such as T-type thermocouples, PT100 platinum resistance, MF51 thermistors, etc., but the heat transfer mode occurs in a vacuum environment. At this time, the main effect of heating the workpiece and the sensor is radiation, and the...

Claims

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Application Information

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IPC IPC(8): G01J5/58
Inventor 丁艳军彭志敏周佩丽
Owner TSINGHUA UNIV
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