This apparatus is a multifunction spectrum testing set-up, which suits to measure for infrared detectors the wide range spectral sensitivity and also the distribution of spectral energy.

Based on the characteristics of the servo-comparison method and an additional apparatus for deciding the certain periods, an absolute displacement sensor with a wide measuring range is realized.

The wide-angle sky screen can be used for measuring the terminal velocity of the projectile, and providing synchronous signal for other trajectory measurement apparatus as the trigger device of the .