Aircraft high-speed flight process micro-pressure measuring device and measuring method
A technology of flight process and measurement device, which is applied in the direction of measurement device, fluid pressure measurement using capacitance change, fluid pressure measurement through electromagnetic components, etc., to achieve the effect of reducing external interference
Active Publication Date: 2015-12-16
CHINA ACAD OF LAUNCH VEHICLE TECH
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[0005] The purpose of the present invention is to overcome the deficiencies of the prior art, adopting the measurement method of multi-sensor fusion combining hot cathode ionization and film capacitance measurement principles, to solve the problem of micro pressure measurement during the high-speed flight of the aircraft
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[0037] The invention aims at identifying the aerodynamic coefficient of the aircraft during the high-speed flight in the rarefied flow region, and carries out the measurement of the atmospheric pressure parameters of the rarefied flow. detection circuit and capacitance signal detection circuit. Using the sensor fusion measurement method combining hot cathode ionization and thin film capacitance measurement principles, the measurement section covers 1000Pa ~ 1mPa, the measurement accuracy can reach 0.2mPa, and the automatic coverage of the entire measurement section can be realized. The micro-pressure measurement device also includes an air inlet pipe and a measurement chamber. The pressure introduction pipe guides the measured airflow from the pressure measurement hole to the measurement chamber. Under the environment of 1000Pa ~ 1Pa, start the thin film capacitive sensor to measure the pressure parameters. When the air pressure is low Below 1Pa, the device automatically switc...
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The invention relates to an aircraft high-speed flight process micro-pressure measuring device and measuring method. The micro-pressure measuring device comprises a thin-film capacitive sensor and a thermionic cathode ionizing sensor. A control circuit firstly controls a power supply module to supply power to the thin-film capacitive sensor. When pressure detected by the thin-film capacitive sensor is less than the preset threshold value, the control circuit controls the power supply module to supply power to the thermionic cathode ionizing sensor so that pressure detection is performed. When pressure detected by the thin-film capacitive sensor or the thermionic cathode ionizing sensor is greater than the preset threshold value, the control circuit controls the power supply to disconnect the thermionic cathode ionizing sensor. Measurement is performed by adopting a mode of combination of two thermionic cathode sensors, measuring sections cover 1000Pa-1mPa, and measuring precision can be 0.2mPa so that a problem of micro-pressure measurement in the aircraft high-speed flight process can be effectively solved.
Description
technical field [0001] The invention relates to a micro-pressure measuring device and a measuring method during high-speed flight of an aircraft, belonging to the field of pressure testing. Background technique [0002] When the aircraft flies at high speed in the airspace with rarefaction effect, the rarefied gas effect accumulates significantly over time, and the aerodynamic thermal analysis of the aircraft cannot be accurately performed. Since the ground test is difficult to simulate the high-altitude and high-speed atmospheric environmental conditions, it is necessary to carry out environmental measurements in the rarefied flow area Research. Among them, the micro-pressure measurement technology surrounding the high-speed flight of the aircraft has become one of the key technologies in the field of high-speed flight measurement. [0003] At present, high-precision piezoresistive sensors or thin-film capacitive sensors are mainly used to measure pressure parameters durin...
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IPC IPC(8): G01L9/00G01L9/12
Inventor 仇公望王小辉欧连军陈玉坤冯忠伟刘冬马小婷刘洋王爽
Owner CHINA ACAD OF LAUNCH VEHICLE TECH