Abstract
This paper proposes a cost-effective, compact, noncontacting optoelectronic targeting system for measuring the distribution of projectile motion. The major elements of this system include a light emitting diode (LED) array, photodiode detecting array, double-layered aperture arrays, adaptive threshold circuit, and date acquisition. Through cooperating with double-layered aperture arrays, the system effectively reduces the radiation width of the light source to the photodiode detecting surface, and filters out the influence of incident light from the adjacent apertures on both sides above each photodiode to the corresponding photodiode detecting surface. It realizes that the response of the photodiode array corresponds to the coordinates of the light screen one by one. Through the sensitivity analysis of the light screen of the system, the system detecting threshold when the projectile passes through the light screen is calculated, and the corresponding adaptive threshold circuit is designed to prevent misjudgment when the system works. The measuring error of the system can reach ±2 mm by experimental verification. Compared with other projectile’s distribution measuring systems, the proposed system has the advantages of having high precision, convenient debugging, is nondestructive, and is a noncontact system.
Highlights
The distribution measurement of projectile motion is a significant evaluation indicator for the development, acceptance, and finalization of weapons [1,2,3,4,5]
At present, according to whether the projectile is in contact with the measuring system, the distribution measuring methods of the projectile are mainly divided into contact measurements and noncontact measurements [6,7,8,9,10]
A parallel light screen shaped by a laser or light emitting diode (LED) is used as the light source to illuminate the sensor array and the coordinates of the projectile are measured by the response of the sensor array to the signal produced when the projectile passes through the light screen [12,13,14,15]
Summary
The distribution measurement of projectile motion is a significant evaluation indicator for the development, acceptance, and finalization of weapons [1,2,3,4,5]. A parallel light screen shaped by a laser or light emitting diode (LED) is used as the light source to illuminate the sensor array and the coordinates of the projectile are measured by the response of the sensor array to the signal produced when the projectile passes through the light screen (i.e., the over-target signal of the projectile) [12,13,14,15] This method usually requires a high cost to customize the specially processed Fresnel lens or convex lens combination; it needs to design the mechanical structure in which to fix them to form the precise collimating optical system. Higher utilization of the target surface is achieved
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