Two-dimensional point range type laser Doppler speed measurement device

Abstract

The invention discloses a two-dimensional point range type laser Doppler speed measurement device. The two-dimensional point range type laser Doppler speed measurement device comprises an emitting module and a receiving module. The emitting module comprises a single-frequency laser source (1), a beam splitter prism (2), a mobile beam splitting plate (3), a transmission type diffraction grating (5), a grating frame (6), a grating frame moving guide rail (4), a reflecting mirror (8), a reflecting mirror bracket (9), a reflecting mirror bracket moving guide rail (7), a horizontal moving table (10), a rotary table (11) and a vertical moving guide rail (12). The receiving module comprises a receiving lens (15), a probe (16) and a signal processing module (17), and is separated from the entire device. The two-dimensional point range type laser Doppler speed measurement device has the advantages of being capable of achieving measurement of the instantaneous speed of projectiles, solving the problem of misalignment caused by ballistic deflection when a single-point differential type Doppler system carries out measurement, and being high in system measurement accuracy, stable in structure and easy to adjust.

Description

technical field [0001] The invention belongs to the field of velocity measurement, in particular to a two-dimensional point-sequence laser Doppler velocity measurement device capable of measuring the instantaneous velocity of a high-speed projectile. Background technique [0002] In the prior art, the velocity of the projectile after it exits the chamber is of great significance to the thrust of the projectile, the design of the trajectory, and the evaluation of the damage effect of the weapon. At the same time, it is also a necessary link and an important indicator for product acceptance, so it has important research value for the accurate measurement of projectile velocity. [0003] There are mainly two types of velocity measurement after the projectile exits the bore: contact measurement and non-contact measurement. Contact measurement includes: copper wire mesh target, foil target, copper wire inertial target, etc. The contact measurement method has the advantages of s...

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Problems solved by technology

[0010] In order to overcome the problems existing in the prior art, the present invention proposes a two-dimensional point row laser Doppler velocity measurement device, which uses a single-frequency laser, a diffraction grating group and a mirror group to construct a two-dimensional point The column detection area can adjust the distance of the measurement point column according to the size of the projectile caliber, which realizes the expansion of the detection range and solves the problem that the single-point differential Doppler velocity measurement system cannot be aligned due to the disturbance of the projectile during measurement.

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