New method to impove temperature measurement accuracy of Pt1000

TIAN Bing-li1， HU Chao2， DING Feng-lei1
（1. Department of Operations and Command Control， Navy Submarine Academy，Qingdao 266071，China
2. Navigation and Communication Group，National Astronomical Observatories，Chinese Academy of Science，
Beijing 100012， China）

Abstract：In order to solve the problems of temperature acquisition，the generalized extended approximation was investigated. After the analysis of improving the temperature acquisition as well as the principle and the way to realize the algorithm，the relationship between generalized extended approximation and temperature acquisition was established，and a new method based on generalized extended approximation was put forward. The correction of temperature acquisition and a comparison between the least square method and generalized extended approximation was evaluated in the Matlab software. The corresponding curves of T-R，the precision of the T-R conversion and temperature acquisition were drawn. The experimental results show that the high accuracy can be obtained by the same Pt1000 and using the proposed approach，especially the zone of border of net.
Key words： Pt1000； temperature measurement； accuracy； generalized extended approximation； least square method