Authors: YangYang Qin XiaoQiu Yang BaoZhen Wu ZhaoHua Sun XiaoBin Shi
Publish Date: 2013/05/20
Volume: 56, Issue: 7, Pages: 1773-1778
Abstract
High resolution temperature measurement technique is one of the key techniques for measuring marine heat flow Basing on Pt1000 platinum resistance which has the characteristics of high accuracy and good stability we designed a bridge reversal excitation circuit for high resolution temperature measurement And the deep ocean floor insitu test results show that 1 temperature deviation and peaktopeak resolution of the first version circuit board V1 are 1960–1990 mK and 0980–0995 mK at 12–27°C respectively and temperature deviation and peaktopeak resolution of the second circuit board V2 are 2260 mK and 1130 mK at 12–13°C respectively 2 During the 2012NSFCIndOcean cruise seafloor geothermal gradient at Ind2012HF03 07 and 12 stations water depth ranges from 3841 to 4541 m were successfully measured the values are 591 751 and 716°C/km respectively And the measurement errors of geothermal gradient at these three stations are less than 30 in terms of the peaktopeak resolution These indicate that the high resolution temperature measurement technique based on Pt1000 platinum resistance in this paper can be applied to marine heat flow measurement to obtain high precision geothermal parameters
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