以微型计算机为基础的现场尘粒浓度测量仪

A MICROCOMPUTER BASED PHOTOMETRIC IN-SITU MERSURING INSTRUMENTFFOR DUST CONCENTRATION

本文提出一种对有害尘粒污染源排放实施现场连续监测系统。仪器具有光电收发对称式尘粒浓度探测头、光学界面沾染自校正单元以及可编程锁相放大器。微机作为中心控制单元，完成光源调制、电机驱动、相移和灵敏度自动调整，实现数据采集与处理，发布测量结果并协调各单元运行。最后，给出了由比较性测量所得实验数据。

The dcsign and the function of a new photometric in-situ monitoringfacility for particulate ernission of pollution source was described in thispaper,The instrument consists of two separate but symetric electrooptic probeswith atrachment which compensates the contanlination of all optical ,surfacesin contact with the process-gas.The signals of the two probe are amplifiedand processed by two programmable lock-in amplifiers respectively,As theentral control unit, the microcomputer not only provides overall, includingoptical modulation,motor driving,auto ranging and phasing,but also performsdata acquisition and analycis. Examples of experimental measurement areshown.