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高分辨率测温技术是海底热流探测中的关键技术之一.本文基于测温精度高、稳定性良好的Pt1000铂电阻,采用电桥反转激励电路原理设计了一种低噪声、高分辨率测温电路.海底原位测试结果表明:基于该电路原理的第1版电路板(V1)在1.2°C～2.7°C的温度波动量为1.960～1.990mK,峰-峰值分辨率为0.980～0.995mK;第2版电路板(V2)在1.2°C～1.3°C的温度波动量为2.260mK,峰-峰值分辨率为1.130mK.这说明本文已经实现了Pt1000铂电阻的mK级高分辨率测温.将该测温方案应用于海底热流探测技术中,可获得较高精度的地热参数,且由峰-峰值分辨率带来的地温梯度测量误差将在3%以内.
High-resolution temperature measurement technology is one of the key technologies in the seafloor heat flux detection.Based on the Pt1000 platinum resistance with high temperature measurement accuracy and good stability, a low noise, high resolution The results of the seafloor in-situ testing show that the circuit board (V1) based on this circuit has a temperature fluctuation of 1.960-1.990mK at 1.2 ° C ~ 2.7 ° C and a peak-to-peak resolution of 0.980 ~ 0.995mK; Version 2 circuit board (V2) temperature fluctuations in the 1.2 ° C ~ 1.3 ° C 2.260mK, peak-peak resolution of 1.130mK.This shows that the paper has achieved the Pt1000 platinum resistance mK high resolution The temperature measurement scheme is applied to the submarine heat flow detection technology to obtain geothermal parameters of higher accuracy and the geothermal gradient measurement error caused by the peak-peak resolution will be less than 3%.