10nm-level particle detection device and method applied to ballistic target test

Abstract

The invention relates to a 10nm-level particle detection device and method applied to a ballistic target test. The device comprises a clamp located in a target chamber, the clamp comprises a connecting part and an installing part, the connecting part is provided with an axial through hole, the installing part comprises a first installing plate and a second installing plate, and the first installing plate and the second installing plate are arranged in parallel at intervals to form a light curtain cavity with an opening; and the device also comprises at least one laser, coupling lenses with thenumber being the same as that of the lenses and photoelectric detectors with the number being the same as that of coupling lenses. According to the scheme, the mode that the clamp is arranged at theoutlet of the emitter is adopted, installation and positioning of the particle detection device are achieved, normal operation of existing equipment is not affected, reliable detection of 10-nm-levelparticles is achieved, and the requirements for speed measurement and control of a 10-nm-level particle collision test can be met.

Description

technical field [0001] The invention relates to the technical field of ultra-high-speed ballistic target testing, in particular to a 10nm particle detection device and method for ballistic target testing. Background technique [0002] The ultra-high-speed ballistic target is an important ground wind tunnel test equipment for the study of hypersonic aerodynamics and ultra-high-speed collision phenomena. The test principle of the ballistic target is: the test gas is static, and the test model flies freely at hypersonic speed in the target chamber to carry out the aerodynamic test. A ballistic target system generally consists of a launcher, a target chamber vacuum system and a velocity measurement control system. [0003] The working process of the ballistic target system is: the launcher launches the particles and the bullet support assembly into the target chamber, and the particles and the bullet support assembly fly freely in the target chamber, and at the same time, the e...

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Problems solved by technology

[0005] At present, the projectile detection in the ballistic target test generally uses a light curtain target. The light curtain is perpendicular to the axis of the target chamber, and the minimum detection model size is 0.5mm, which cannot meet the task requirements of 10nm-level particle detection. The main reasons are as follows: First, light The width of the curtain is not enough, the light curtain width of the light curtain target is 50mm, the mass of the particles is small, the dispersion when flying to the detector is larger than the width of the light curtain, the particles are not within the detection range, if the detection range is increased, the current equipment must be changed: supporting processing special The detection window and detector, the test cost and period cannot meet the requirements; the second is that the detection sensitivity is not enough. Using the existing measurement method, the light subtraction signal generated by 10nm particles passing through the light curtain is weak, about 8.5mV, and the background noise of the detection system is usually 5-10mV, the signal will basically be submerged in the noise and cannot be identified; the third is that there is a large uncertainty in the detection results

[0006] In summary, it can be seen that in the ballistic target test, the detection of 10nm particles cannot be realized by using the existing detection equipment and methods

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