A motion strobe observation instrument, also known as a strobe or strobe still camera, is an optical detection instrument that uses high brightness LED or xenon lamp to emit extremely short flashes at a controllable frequency, making objects that rotate or reciprocate at high speed visually "stationary" or "slow down". When the flash frequency is synchronized with the object motion frequency, high-speed motion is "frozen" through the human visual persistence effect, allowing for clear observation of surface defects, meshing conditions, vibration amplitude, and trajectory. Applied to printing and packaging, online inspection of printing, die-cutting, punching, and folding quality. Research and teaching: string vibration, turntable flow field, water droplet velocity, high-speed photography assistance.