标题：Dual reference point temperature interrogating method for distributed temperature sensor
作者：Xin Ma;Fang Ju;Jun Chang;Weijie Wang;Zongliang Wang
作者机构：School of Information Science and Engineering and Shandong Provincial Key Laboratory of Laser Technology and Application, Shando
来源：Laser physics letters
摘要：A novel method based on dual temperature reference points is presented to interrogate the temperature in a distributed temperature sensing (DTS) system. This new method is suitable to overcome deficiencies due to the impact of DC offsets and the gain difference in the two signal channels of the sensing system during temperature interrogation. Moreover, this method can in most cases avoid the need to calibrate the gain and DC offsets in the receiver, data acquisition and conversion. An improved temperature interrogation formula is presented and the experimental results show that this method can efficiently estimate the channel amplification and system DC offset, thus improving the system accuracy.