For the leakage often occured on condenser brass pipe of hanchuan power plant , using differential inner insert detecting coil the on - line multi - frequency eddy current check technology effectively restrains interferance source signal from support board , etc , improves measuring sensitivity and the measuring result gets more reliable 摘要針對(duì)漢川電廠凝汽器銅管在運(yùn)行中多次發(fā)生泄漏,利用差分內(nèi)插式檢測(cè)線圈,通過(guò)多頻渦流檢測(cè)技術(shù)對(duì)凝汽器進(jìn)行渦流在役檢測(cè),有效地抑制了支撐板等干擾源信號(hào),提高了檢測(cè)靈敏度,使得檢測(cè)結(jié)果更可靠。
Firstly , the temperature varies in a large range in the place where the gap sensor works , so this paper analyzes the temperature drift of gap sensor , and finds out that the main reasons which result in temperature drift are the resistance of detecting coil and demodulating circuit parameters . to resolve this problem , a practical design of detecting coil is given , and a compensative measure considering the detecting coil and demodulation circuit is proposed to improve the temperature stability of gap sensor 首先,針對(duì)間隙傳感器工作環(huán)境溫度變化較大的情況,本文對(duì)間隙傳感器溫度漂移現(xiàn)象進(jìn)行了分析,認(rèn)為檢測(cè)線圈電阻和檢波電路參數(shù)變化是造成傳感器溫漂的主要原因,建立了檢測(cè)線圈的數(shù)學(xué)模型,提出了檢測(cè)線圈和檢波電路綜合補(bǔ)償方法,解決了間隙傳感器的輸出信號(hào)溫度穩(wěn)定性的問(wèn)題。