的关键。首先,对热电极丝材进行剪切、清洗、退火并焊接组装成热电偶;然后,再对制作成的热电偶进行退火实验,热电偶在其使用上限965℃附近累计退火时间700h,在银凝固点的稳定性达到±0.02℃。在制造热电偶过程中,采取了传统结构、小圈结构、U型结构3种不同的方式构建了热电偶测量端,实验结果表明:小圈结构制作的测量端其短期稳定性比起U型结构更好。
Abstract
The stability of thermo-electric character in long term application of Au/Pt thermocouple, which is fabricated by a pure golden wire and a platinum wire, is a key to high accurate performance to in temperature measurement.Firstly, the thermo-elements were cut, cleaned, annealed, welded. Then, the thermo-elements were assembled to the thermocouples and were tested. The stability of whole thermocouples was proved within ±0.02℃ at Ag freezing point calibration, after ageing time of thermocouples was summed up to about 700h at temperature up to 965℃.The thermocouple measurement junction was constructed in three different ways: traditional type, mini-coil type and U shape type, the experiment results showed that the short-term stability is better for mini-coil type compare to U shape type applied to thermocouple measurement junction connection.
关键词
计量学 /
金-铂热电偶;测量端 /
热电稳定性
Key words
metrology /
Au/Pt thermocouple /
measurement junction /
thermoelectric stability
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基金
国家质量基础的共性研究与应用项目(2017YFF0205903)
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