LED strobe lights use high-power LEDs instead of traditional mercury lamp strobe sources, significantly reducing the size of the light source, extending its lifespan several times, and lowering costs. Different LED materials have different response times; for example, GaAs, GaAsP, and GaAlAs have response times less than 10^(-9) s, making them suitable for 10–100 MHz high-frequency systems, meeting the needs of capturing the trajectories of high-speed moving objects. The luminous efficacy of high-power LEDs exceeds 110 lm/W, far surpassing that of low-pressure mercury lamps, and their response speed is also much faster, achieving very high brightness instantly.
The driving circuit of a high-power LED strobe light source mainly consists of a signal generator composed of a 555 multivibrator, a power amplifier, and LEDs. Changing the oscillation frequency of the signal generator alters the strobe time interval. To ensure stable operation of the LED chip, a finned aluminum or copper heat sink is used for heat dissipation. This light source, when used with a digital camera, can capture the motion trajectories of high-speed moving objects and can be used to measure the rotational speed and periodic vibration frequency of rotating objects.
