基于TDC-GP1高精度定时器的新型超声波热能表  

An Innovative Ultrasonic Calorimeter Based on TDC-GP1

作　　者：张万江[1] 侯静[1] 朱栋华[1] 马斌[1] 

机构地区：[1]沈阳建筑大学信息与控制工程学院,辽宁沈阳110168

出　　处：《沈阳建筑大学学报（自然科学版）》2008年第1期164-167,共4页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家科技部国际科技合作重点项目(2004DFAD7500)

摘　　要：目的为了提高热能表的计量精度及降低功率损耗,使热能表适用于更广泛的热量计量.方法从热量测量的基本原理出发,结合供暖系统的技术指标,根据时差法的测量原理,研制了一种新型的超声波热能表.结果实验数据表明该超声波热能表获得了良好的测量结果,其温度误差小于0.04℃、测量误差小于±1.2%,热量表的平均工作电流不超过36μA,休眠时电流小于6.5μA,平均功耗小于0.13 mW.结论基于TDC-GP1的超声波热能表解决了传统热表计量精度较低和功率损耗大的缺点.A new ultrasonic calorimeter based on TDC-GP1 is introduced in this paper. TDC-GP1 is a chip which can transform time intervals into digital values with very high precision; it is the hard core in the design of this calorimeter. The up current speed of ultrasonic is different from the down one, so the main measuring principle is the time difference method. In respect of software, questions about nonlinear corrections and temperature compensation are also taken into account. The favorable results show that 0.04 ℃ is the maximum figure gained through this method compared with the actual one; metrical errors are less than 1.2 % ;the average electric current does not exceed 36μA while working; the current is less than 6.5 μA with the calorimeter not detecting; the average consuming power is less than 0.13 mW. The ultrasonic calorimeter has the merits of low power consumption, good running stabilization, high measured precision and long employment llfe-span, so the innovative ultrasonic calorimeter has widely applied foreground.

关 键 词：超声波热能表 TDC—GP1 非线性校正 温度补偿 

分 类 号：TH714[机械工程—测试计量技术及仪器]