Heat-Released Infra-Red Roller Temperature Measuring System

The subject involves in some important problems and present situation that exist in measuring leather belt roller's temperature in coal mine. So designed a kind of application system on non-contactable intelligent temperature measurement. On the basis of working principle of all kinds of common contactable temperature sensor and non-contactable infra-red heat-released probe, this system adopts infra-red heat-released effect to sense heat source, and the regulated circuit of signal adopt three-stage amplification, because of v-level small signal from probe output. In the three-step amplification, the first-step adopt special amplifier AD620. To make the system's application flexible, the output signal of the regulated circuit is frequency signal that can be fed into CPU or other systems to carry out measuring temperature. The CPU is new type microprocessor LPC764 of PHILIPS corporation that have watch-dog circuit inside. In order to make this intelligent measuring system apply to network, I design skilled RS485 bus communication interface circuit and design system supply, storage circuit, display circuit, alarming circuit and so on. On software, to improve anti-interference performance, measuring temperature adopts digital filtering method and the protocol adopt the mode of sending check code to protect from communication error code. At the same time, to improve measuring precision, adopt multi-period measuring method. In some degree, the research on this subject resolved non-contactable temperature measurement on industrial site, which has certain practicability and high social generalization value.