With the continuous improvement of the loading rate of projectiles in gas guns and their testing accuracy, the requirements for the uniformity and parallelism of the light energy distribution of the light curtain of the laser test system are getting higher and higher. A diffractive optical element (DOE) is used to shape the laser beam into a linear uniform beam, and a Fresnel lens is utilized to form a uniform parallel light curtain, which passes through a 1/3 beam splitter, a half-transparent half-reflector and a total-reflector mirror to realize a highly parallel integrated single-light-source three-light curtain. Using the improved GS algorithm to design the DOE element to obtain a linear distribution of the beam, the uniformity of the experimental test is 83.7%; the parallelism of the three-light curtain is tested, and the maximum deviation is 0.279 mrad. This single-light-source three-light curtain system can meet the needs of ultra-high-speed gas shell speed measurement on the sensitivity of the light curtains and the demand for speed accuracy.
LIShiyan, CAIDeyong. Design and experimental study of muzzle velocity testing device based on electromagnetic induction[J]. Journal of Ordnance Equipment Engineering, 2019, 40(10): 80-82. (in Chinese)
LIJin, LIYunliang, QIANBingwen, et al. Improved laser velocity-measuring system for measuring the projectile velocity of three-stage light-gas gun[J]. Acta Armamentarii, 2017, 38(S1): 146-149. (in Chinese)
ZHAOQifeng, LIJin, LIYunliang, et al. Study on velocity measurement of light gas projectile based on high speed photographic images[J]. Computer Measurement & Control, 2021, 29(11): 132-136. (in Chinese)
DENGYunfei, ZHANGWei, JIABin, et al. A system for measuring two-stage light gas gun projectile velocity with laser screen and photodetector[J]. Chinese Journal of High Pressure Physics, 2011, 25(4): 296-302. (in Chinese)
WANGZhanxuan, ZHAODonge, LIUJi, et al. Design of air gun projectile velocity measurement system based on laser velocity measurement[J]. Journal of Projectiles, Rockets, Missiles and Guidance, 2014, 34(2): 51-54. (in Chinese)
DUANZhongxing, YANGQifan, LIJin, et al. New laser projectile velocity-measuring system with high SNR for light-gas gun[J]. Journal of Electronic Measurement and Instrumentation, 2021, 35(5): 154-160. (in Chinese)
CHENYuxuan, ZHANGBin, CHUWenbo. Research on the sensitivity of large target surface velocity measurement system with laser screen[J]. Foreign Electronic Measurement Technology, 2020, 39(2): 1-4. (in Chinese)
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HOFFNAGLEJ A, JEFFERSONC M. Design and performance of a refractive optical system that converts a Gaussian to a flattop beam[J]. Applied Optics, 2000, 39(30): 5488-5499.
ZHOUYe, ZHUQixin, HUANGZhongya, et al. Design and experimental investigations of laser homogenization system based on cylindrical microlens array[J]. Laser & Infrared, 2020, 50(4): 486-492. (in Chinese)
ZHANGYuying, ZHAOShuai, ZHENGXin. Design of DOE based on modified GS algorithm for preparation of micron-scale uniform light spot in ultraviolet band[J]. Acta Optica Sinica, 2023, 43(7): 119-126. (in Chinese)