研究了基于集成心跳探测芯片的心跳测试仪，介绍了其组成部分，即反射式红外传感器，单片机和LED显示器。
Studies heart rate testers based on integration heartbeat detection chip and introduces other components of the testers such as reflective infrared sensor, single-chip and LED display.
从粉尘测试仪的实际使用要求说明设计的非球面反射镜满足实际需求。
The parameters and image evaluation of the aspheric mirror are given. The aspheric mirror meets the requirements of dust testing instrument in practice.
从粉尘测试仪的实际使用要求说明设计的非球面反射镜满足实际需求。
The parameters and image evaluation of the aspheric mirror are given. The aspheric mirror meets the requirements of dust testing instrument in practice.
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