基于FPGA的多通道温度采编装置设计

Design of multi-channel temperature editing device based on FPGA

针对飞行试验中对设备温度测量的需求,设计了一种适用于飞行测试的高精度多通道温度采编装置。设计以FPGA构建信号采集处理系统,采用AD8227和AD590来实现信号的调理和温度冷端补偿,通过标准RS422协议实现16路温度信号传输,并采取线性拟合的方式对输出进行非线性校正,提高了系统准确率和稳定性。测试结果表明,测温电路全量程内最大测量误差为±0.083%F.S.。经过测试验证,该方案传输过程无丢帧零误码,系统运行高效、可靠。

In response to the requirements for equipment temperature measurement in flight tests,a high-precision multichannel temperature acquisition device suitable for flight tests is designed.The signal acquisition and processing system is built with FPGA,and AD8227 and AD590 are used to realize signal conditioning and temperature cold end compensation,which improves the accuracy and stability of the system.The 16-channel temperature signal transmission is realized through the standard RS422 protocol,and the output is nonlinearly corrected by linear fitting,which improves the accuracy and stability of the system.The test results show that the maximum measurement error in the full range of the temperature measurement circuit is±0.083%F.S..After testing and verification,the transmission process of this scheme has no frame loss and zero error code,and the system runs efficiently and reliably.