一、调校时克服“回程”的快速方法红外线气体分析仪在调校过程中经常碰到一个问题就是出现“回程”现象,它使仪器灵敏度降低,以致无法工作。造成“回程”的根本原因在于参比臂的红外光强度Ⅰ参小于(甚至大大小于)测量臂红外光强度Ⅰ测。如图一中的 A 点,当通零气时,由于Ⅰ参<Ⅰ测,则指示值大于0,对于 HQG—71A 型红外线气体分析仪(例 First, to overcome the “backhaul” fast method of adjustment Infrared gas analyzer calibration process often encountered a problem is the “return” phenomenon, which makes the instrument lower the sensitivity, so that can not work. The root cause of the “return trip” is that the reference arm’s infrared light intensity is less than (even much less than) the measured arm infrared light intensity. As shown in Figure A point, when the pass zero gas, due to Ⅰ Senate Ⅰ measurement, the indication is greater than 0, for the HQG-71A infrared gas analyzer (for example