Characteristics of a Type of NTC Thermistors for Cryogenic Applications  

作　　者：Yuqi Lan Shenyin Yang Guangming Chen Sifeng Yang Yuqi Lan;Shenyin Yang;Guangming Chen;Sifeng Yang(Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, China;Beijing Institute of Aerospace Testing Technology, Beijing, China)

机构地区：[1]Institute of Refrigeration and Cryogenics, Zhejiang University, Hangzhou, China [2]Beijing Institute of Aerospace Testing Technology, Beijing, China

出　　处：《Advances in Materials Physics and Chemistry》2020年第8期167-177,共11页材料物理与化学进展（英文）

摘　　要：A new type of miniature negative temperature coefficient (NTC) thermistors has been developed and manufactured with Mn-Ni-Cu-Fe oxides. The prepared NTC thermistors were calibrated in the temperature range from 77 K to 300 K with 1 μA exciting currents. The automatic calibration apparatus as well as thermometric characteristics, stability, calibration equations and interchangeability of the manufactured thermistors were investigated. A mean fit equation was obtained: 1/<em>T</em> = 8.60 × 10^{<span style="white-space:nowrap;">&#8722;</span>4} + 6.54 × 10^{<span style="white-space:nowrap;">&#8722;</span>4} ln(<em>R/R</em>_ref) + 2.46 × 10^{<span style="white-space:nowrap;">&#8722;</span>5} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)² + 9.48 × 10^{<span style="white-space:nowrap;">&#8722;</span>7} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)³ <span style="white-space:nowrap;">&#8722;</span> 2.16 × 10^{<span style="white-space:nowrap;">&#8722;</span>8} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)⁴. All the prepared NTC thermistors agreed with this fit with an error of 1.5 K. If the greater accuracy is required, a calibration is necessary, and the calibration accuracy is estimated to be ±10 mK.A new type of miniature negative temperature coefficient (NTC) thermistors has been developed and manufactured with Mn-Ni-Cu-Fe oxides. The prepared NTC thermistors were calibrated in the temperature range from 77 K to 300 K with 1 μA exciting currents. The automatic calibration apparatus as well as thermometric characteristics, stability, calibration equations and interchangeability of the manufactured thermistors were investigated. A mean fit equation was obtained: 1/<em>T</em> = 8.60 × 10^{<span style="white-space:nowrap;">&#8722;</span>4} + 6.54 × 10^{<span style="white-space:nowrap;">&#8722;</span>4} ln(<em>R/R</em>_ref) + 2.46 × 10^{<span style="white-space:nowrap;">&#8722;</span>5} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)² + 9.48 × 10^{<span style="white-space:nowrap;">&#8722;</span>7} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)³ <span style="white-space:nowrap;">&#8722;</span> 2.16 × 10^{<span style="white-space:nowrap;">&#8722;</span>8} ln(<em style="white-space:normal;">R/R</em><sub style="white-space:normal;">ref</sub>)⁴. All the prepared NTC thermistors agreed with this fit with an error of 1.5 K. If the greater accuracy is required, a calibration is necessary, and the calibration accuracy is estimated to be ±10 mK.

关 键 词：THERMOMETER Cryogenics THERMISTORS CALIBRATION CRYOSTAT 

分 类 号：O17[理学—数学]