A Study on Miniaturized In-Situ Self-Calibrated Thermometers Based on Ga and Ga-Zn Fixed Points
Abstract
:1. Introduction
2. Self-Calibration Method
3. Hardware Fabrication & Integration
3.1. Fabrication of MISSC Thermometers
- A temperature sensing component. The copper-constantan (type T) thermocouple manufactured by Chengdu Shuangtie Instrument Co., Ltd. (Chengdu, China) was chosen as the temperature measurement sensor. It also can be replaced by other sensors such as platinum resistance;
- A fixed point container. It is a cylindrical soaking block shell with two fixed point material cells, separately filled with Ga and Ga-Zn. The cylindrical soaking block shell was made of graphite to guarantee a uniform temperature field;
- A flexible heating resistance film. It was uniformly pasted and wrapped around the cylindrical soaking block shell and could be used to heat the fixed point container when self-calibration was carried out. For safety considerations, a fuse is adopted and connected between the film and the power wire. An asbestos heat insulation layer was wrapped on the outermost wall.
3.2. Integration of M&C System
- A heating control subsystem. It mainly includes a direct current (DC) power (DH1799M) made by Beijing Dahua Radio Instrument Co., Ltd. (Beijing, China) and a renewable fuse, which are used to control the heating power and ensure the temperature rising rate of the fixed-point materials.
- A temperature measurement subsystem. It is adopted to measure the temperature according to the temperature-sensing component in the MISSC thermometer. In detail, it consists of two parts: one is the temperature transmitter that can transmit the weak electromotive force signal generated by the thermocouple to a normalized voltage signal; the other is the data acquisition system whose hardware and software were installed in a personal computer (PC).
- A data processing subsystem. It is a self-developed software installed in the PC that is used to collect and process the temperature data obtained during mini-power heating for in-situ self-calibration and presenting a calibration result.
4. Experimental Results and Discussion
4.1. Initial Calibration
4.2. Self-Calibration
4.3. Discussion
5. Conclusions
Author Contributions
Funding
Institutional Review Board Statement
Informed Consent Statement
Data Availability Statement
Conflicts of Interest
References
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No. | Diameter/mm | Height/mm | Ga Mass/g | Ga-Zn Mass/g |
---|---|---|---|---|
1 | 40 | 50 | 86.44 | 87.21 |
2 | 20 | 30 | 8.87 | 8.92 |
3 | 16 | 25 | 4.04 | 4.18 |
No. | Resistance/Ω | Applied Current/A | Heating Power/W |
---|---|---|---|
1 | 455.9 | 0.06 | 1.64 |
2 | 128.1 | 0.06 | 0.46 |
3 | 83.6 | 0.08 | 0.54 |
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Huang, H.; Cai, W.; Mao, Y.; Wan, K.; Wen, Y.; Han, Y.; Zhang, Q.; Zhang, R.; Zheng, X. A Study on Miniaturized In-Situ Self-Calibrated Thermometers Based on Ga and Ga-Zn Fixed Points. Sensors 2024, 24, 5744. https://doi.org/10.3390/s24175744
Huang H, Cai W, Mao Y, Wan K, Wen Y, Han Y, Zhang Q, Zhang R, Zheng X. A Study on Miniaturized In-Situ Self-Calibrated Thermometers Based on Ga and Ga-Zn Fixed Points. Sensors. 2024; 24(17):5744. https://doi.org/10.3390/s24175744
Chicago/Turabian StyleHuang, Haiying, Wenlu Cai, Yongjian Mao, Kun Wan, Yong Wen, Yuqiang Han, Qiang Zhang, Rong Zhang, and Xing Zheng. 2024. "A Study on Miniaturized In-Situ Self-Calibrated Thermometers Based on Ga and Ga-Zn Fixed Points" Sensors 24, no. 17: 5744. https://doi.org/10.3390/s24175744