Selection of active outdoor infrared detectors, active infraredtransmitter sent a bouquet of the infrared beam by the modulation, into the infrared receiver to form a cordon.
室外选用主动式红外探测器，主动红外发射器发出一束经调制的红外光束，投向红外接收器，形成一条警戒线。
2
The principle of measurement is as follows: a probe, which features a transmitter and receiver of red and infrared light, is positioned to transilluminate a pulsatile arteriolar bed.
测量原理如下：一个传送和接收红光和红外光的探针放置并透照搏动的微动脉床。
3
The system is composed of a infrared telecontrol transmitter and the circuits of infrared receiving and display, input detecting and output controlling commanded by the 89c51 single-chip computer.