X-ray absorption-based atmospheric density measurement system
An atmospheric density and measurement system technology, applied in the field of space exploration, can solve the problems of not being able to completely cover the cruising altitude range of aerospace vehicles, and cannot reach the altitude range, so as to avoid measuring temperature and pressure, overcome system structure and calculation complexity, and structure Simple and compact effect
Active Publication Date: 2019-05-31
NAT SPACE SCI CENT CAS
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[0003] Traditional atmospheric density measurement systems mainly include: lidar and in-situ detection; these detection methods can only achieve a measurement height of tens of kilometers; however, traditional atmospheric density measurement systems cannot completely cover trans-atmospheric aerospace vehicles The cruising altitude range cannot reach the altitude range of tens of kilometers to one hundred kilometers
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[0049] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0050] Such as figure 1 As shown, the present invention proposes a kind of atmospheric density measuring system based on X-ray absorption, and this system is positioned in the vacuum chamber 8, is used for obtaining the atmospheric environment of vacuum environment or different densities, for example can make in the vacuum tank The pressure takes any pressure value within the range of 101325Pa to 1e-3Pa; the system includes: X-ray source 1, SDD detector 2, high-precision coordinate instrument 3, first X-ray shielding cover 4, second X-ray The shielding cover 5 and the controller and the data acquisition and processing terminal 6; the SDD detector 2 and the X-ray source 1 are coaxially placed opposite each other, and the distance between the two is increased equidistantly;
[0051] The X-ray source 1 is used to provide the X-ray light source required for meas...
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The invention discloses an X-ray absorption-based atmospheric density measurement system. The system is located in a vacuum chamber (8); the system comprises an X-ray source (1), an SDD detector (2),a high-precision coordinate instrument ( 3) a first X-ray shield (4), a second X-ray shield (5), and a controller and data processing terminal (6); the SDD detector (2) and the X-ray source (1) are arranged coaxially and oppositely; the X-ray source (1) is used for providing an X-ray light source required by measurement; the SDD detector (2) is used for receiving X-ray energy spectrum counts, andperforming energy calibration, quantum efficiency calibration, dead time calibration, and divergence angle calibration on the X-ray energy spectrum counts so as to obtain calibrated X-ray energy spectrum counts; and the controller and data processing terminal (6) is used for performing Bayesian estimation according to the calibrated X-ray energy spectrum counts and an X-ray Poisson statistical maximum likelihood estimation so as to obtain ground atmospheric density.
Description
technical field [0001] The invention relates to the technical field of space detection, in particular to an X-ray absorption-based atmospheric density measurement system. Background technique [0002] With the development of international aerospace technology, trans-atmospheric aerospace vehicles have developed rapidly in recent years. Trans-atmospheric aerospace vehicles are aircrafts whose flight altitude spans the entire atmosphere. Countries around the world have carried out extensive and in-depth research in this field. Research. Since the cruising altitude of the transatmospheric aerospace vehicle is within the entire atmosphere, the structural parameters of the middle and upper atmosphere have an important influence on the design, test and use of the transatmospheric aerospace vehicle. In particular, the density of the middle and upper layers of the thin atmosphere is of great significance to the aerodynamic and aerothermal design of transatmospheric aerospace vehicl...
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Inventor 李海涛李保权牟欢
Owner NAT SPACE SCI CENT CAS