非接触式传感器的频率校正  

Frequency Compensation for Non-contract Transducer

作　　者：陈忧先[1] 

机构地区：[1]东华大学信息学院,上海200051

出　　处：《仪器仪表学报》2003年第z2期146-147,共2页Chinese Journal of Scientific Instrument

摘　　要：光耦合非接触式测温传感器用热电阻直接测量温度,然后通过信号的转换,最后以光信号形式将温度信号非接触传送出去。信号转换过程中其稳定的频率会随集成芯片的更换而出现较大变化,利用脉宽调制的方法给予校正,以达到高精度的测量目的。A non-contact temperature transducer based on light coupling detects the temperature directly with resistance thermometer, and then transports the signal by a non-contact method in order to obtain high accuracy. The frequency generated by the oscillator changes greatly as long as the IC's chip is alternated with the same type one, which can be compensated by using pulse width modulation method.

关 键 词：光耦合 非接触 脉宽调制 频率校正 

分 类 号：TP21[自动化与计算机技术—检测技术与自动化装置]