Hot film wind speed and direction measurement system for low pressure

Abstract

The invention provides a wind speed measurement system applicable to extreme low pressure environments such as the Mars. The system comprises a heating bar, a casing, multiple groups of thermocouple hot ends, a common cold end and corresponding leads, a heating-used power supply, a pressure sensor, a data acquisition module and a wind speed calculation module. Under the low pressure, the heating bar is controlled to heat the casing through a constant heat flow mode, the acquisition module is used to measure the temperature differences of multiple thermocouples distributed uniformly on the surface of the sensor, and the current absolute pressure is combined to calculate the current wind speed and direction information. In comparison with the current wind speed sensor for industrial use, thehot film wind speed and direction measurement system under low pressure can directly work under the low pressure and has a synchronous wind speed and direction test ability, the structure is simple,and the reliability is high.

Description

technical field [0001] The invention belongs to wind speed measurement technology, and in particular relates to a system capable of measuring wind speed and wind direction under low air pressure based on the hot film principle. Background technique [0002] With the diversification and maturity of my country's space missions, the detection of other extraterrestrial planets such as Mars has been gradually carried out. Composite simulation of temperature, pressure, and wind speed in the environment. In addition to the common pressure and temperature environments, it is generally necessary to simulate the gas composition and wind speed. At present, common wind speed sensors can be divided into thermal type, ultrasonic type, pitot tube type, mechanical type, laser particle speed measurement and other methods according to the principle. Anemometers have great advantages in measuring. [0003] The principle of the hot wire, hot bulb, and hot film wind speed sensor is mainly to ca...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by this invention is to effectively measure the wind speed and wind direction under low air pressure. The signal of the sensor meets the accuracy requirements of the measuring equipment, and the sensor has a certain mechanical strength, which is not easy to be damaged in a special environment, and meets the ground special test, Stratosphere and planetary surface wind speed measurement requirements, and have certain expansion capabilities according to requirements

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