电子设计工程
電子設計工程
전자설계공정
ELECTRONIC DESIGN ENGINEERING
2012年
14期
84-87
,共4页
温度测量%多点%温度频率变换%热敏电阻%TLC555%8253计数器
溫度測量%多點%溫度頻率變換%熱敏電阻%TLC555%8253計數器
온도측량%다점%온도빈솔변환%열민전조%TLC555%8253계수기
temperature measurement%multi point%temperature frequency transform%thermistor%TLC555%8253 counter
针对一般测温方法在进行流体多点温度测量时存在系统复杂,准确度和速度难以兼顾的问题,提出了一种基于温度-频率（T-F）变换的测量系统。该系统使用PIC18F6722单片机控制MOS管开关阵列,使多个测点的热敏电阻分别与TLC555构成振荡电路,将测点的温度变化转化为振荡频率的变化,使用8253计数芯片对TLC555的输出信号进行测量并产生中断,单片机读取8253计数值反演为测点温度。实验表明,测点数目增多不会增加测量系统的复杂程度,通过设置8253的计数初值,可以在不改变硬件的情况下灵活选择测量的准确度和速度,满足了流体多点精确快速测温的需求。同时该系统具备简洁实用,成本低的优点。
針對一般測溫方法在進行流體多點溫度測量時存在繫統複雜,準確度和速度難以兼顧的問題,提齣瞭一種基于溫度-頻率（T-F）變換的測量繫統。該繫統使用PIC18F6722單片機控製MOS管開關陣列,使多箇測點的熱敏電阻分彆與TLC555構成振盪電路,將測點的溫度變化轉化為振盪頻率的變化,使用8253計數芯片對TLC555的輸齣信號進行測量併產生中斷,單片機讀取8253計數值反縯為測點溫度。實驗錶明,測點數目增多不會增加測量繫統的複雜程度,通過設置8253的計數初值,可以在不改變硬件的情況下靈活選擇測量的準確度和速度,滿足瞭流體多點精確快速測溫的需求。同時該繫統具備簡潔實用,成本低的優點。
침대일반측온방법재진행류체다점온도측량시존재계통복잡,준학도화속도난이겸고적문제,제출료일충기우온도-빈솔（T-F）변환적측량계통。해계통사용PIC18F6722단편궤공제MOS관개관진렬,사다개측점적열민전조분별여TLC555구성진탕전로,장측점적온도변화전화위진탕빈솔적변화,사용8253계수심편대TLC555적수출신호진행측량병산생중단,단편궤독취8253계수치반연위측점온도。실험표명,측점수목증다불회증가측량계통적복잡정도,통과설치8253적계수초치,가이재불개변경건적정황하령활선택측량적준학도화속도,만족료류체다점정학쾌속측온적수구。동시해계통구비간길실용,성본저적우점。
Aiming at the common method existed the complicated system,and also a problem about balance of accuracy and speed in the process of fluid multi-point temperature measurement,introduced a multi-point measurement system based on temperature-frequency transform.This system used the PIC18F6722 MCU to control the switch array of the MOS tube,which made thermistors at many measuring points constituted the oscillating circuit with TLC555,the temperature change of measuring points turned to be a change of oscillation frequency.And it applied the 8253 counter chip to measure the output signal from TLC555 and emerged interruption.The MCU fetched the count value of 8253 and changed to be the temperature at measure points.The practical use shows that the increasing of measuring point numbers doesn’t increase the complexity of the measurement system.With setting up the initial count value of 8253,it can neatly configure the accuracy and speed of measurement without changing hardware,which can satisfy the quick and accurate temperature measurement of the fluid multi-point.Also,the system is very useful and convenient,but costs low.
