Optics detection performance analysis and line light source design on sky-screen

The sky-screen is an instrument that works in field to detect the information of projectile; its principle is when the projectile passing through detection screen, it output a pulse signal to time. However, the sky-screen cannot work at night. It is necessary that study optics detection performance and design appropriate light source to satisfy the need. In this paper, the detector was selected to improve the sensitivity of sky-screen; and analyze the optics detection performances. The infrared LED that its wavelength is 680 n in was selected to design the line light source, which can improve sky-screen can work under low illumination; the design principle of line light source was introduced. Through experimentation in shooting range, it is proved that the line light source can satisfy the demand, and can improve the detection sensitivity of sky-screen. The detection distance reach 1800 multiple projectile diameters, the detection view up to about 800, the performance of light source is more stably in work.