Characteristics of a Type of NTC Thermistors for Cryogenic Applications

• 作者: Guangming Chen Shenyin Yang Sifeng Yang Yuqi Lan
• 来源期刊: 材料物理与化学进展(英文)
• 学科: 数学
• 关键词: THERMOMETER Cryogenics THERMISTORS CALIBRATION CRYOSTAT
• 年，卷（期）: clwlyhxjzyw_2020,（8）
• 页码范围: 167-177
• 页数: 11页
• 分类号: O17

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.