Abstract
In the laser screen velocity measuring (LSVM) system, there is a deviation in the consistency of the optoelectronic response between the start light screen and the stop light screen. When the projectile passes through the light screen, the projectile’s over-target position, at which the timing pulse of the LSVM system is triggered, deviates from the actual position of the light screen (i.e., the target deviation). Therefore, it brings errors to the measurement of the projectile’s velocity, which has become a bottleneck, affecting the construction of a higher precision optoelectronic velocity measuring system. To solve this problem, this paper proposes a method based on high-speed shadow imaging to measure the projectile’s target deviation, ΔS, when the LSVM system triggers the timing pulse. The infrared pulse laser is collimated by the combination of the aspherical lens to form a parallel laser source that is used as the light source of the system. When the projectile passes through the light screen, the projectile’s over-target signal is processed by the specially designed trigger circuit. It uses the rising and falling edges of this signal to trigger the camera and pulsed laser source, respectively, to ensure that the projectile’s over-target image is adequately exposed. By capturing the images of the light screen of the LSVM system and the over-target projectile separately, this method of image edge detection was used to calculate the target deviation, and this value was used to correct the target distance of the LSVM to improve the accuracy of the measurement of the projectile’s velocity.
Highlights
Accurate measurement of a projectile’s velocity is an important part of the performance testing technology of weapons as it has a profound impact on the research, production, application, and development of weapons [1,2,3,4]
We proposed a method based on high-speed shadow imaging to obtain the image of the projectile’s position when the laser screen velocity measuring (LSVM) system generates the timing signal [18,19,20,21,22], which uses the image processing to obtain the target deviation of the projectile relative to the light screen, thereby correcting the target distance of the LSVM system
In order to adjust the image sensor, laser source module, and light screen so that they are coaxial, a special structure for marking the light screen is placed at the position of the ballistic line in the light screen
Summary
Accurate measurement of a projectile’s velocity is an important part of the performance testing technology of weapons as it has a profound impact on the research, production, application, and development of weapons [1,2,3,4]. At present, related research has only measured the response speed of the optoelectronic signal processing circuit of the two light screens of the optoelectronic velocity measuring system under laboratory conditions, and through the circuit design, the detected response speed of the two light screens can be made as consistent as possible This type of research does not ensure that the projectile flies within the interval of the two timing pulses is equal to the actual target distance. We proposed a method based on high-speed shadow imaging to obtain the image of the projectile’s position when the LSVM system generates the timing signal [18,19,20,21,22], which uses the image processing to obtain the target deviation of the projectile relative to the light screen, thereby correcting the target distance of the LSVM system.
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