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Proceedings Paper

Digital telemetry thermometer based on quartz crystal sensor
Author(s): Xianhe Huang; Minqiang Li; Qilong Rong; Feng Wang; Ping Zheng; Feng Xie
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Paper Abstract

For realizing telemetry of temperature, an approach is demonstrated in this paper. With the Christoffel equation, we draw the F-T characteristics of the thickness mode of YXL+5° anisotropy quartz crystal. The result shows that its frequency is in direct proportion to temperature in a wide temperature range and its sensitivity is about 94*10-6/°C. As high Q characteristic of quartz crystal, sensors made by these crystals are of high accuracy, high stability and high resolution. Moreover, since outputs of these sensors are frequency signals, it is convenient to process without A/D converter and makes remote measurement possible. So, a digital telemetry thermometer is developed, which includes a sensor, a mixer, a sender and a receiver. The sensor is made of a YXL+5° anisotropy quartz crystal. It gets current ambiance temperature T and exports the frequency signal f (T) to the mixer, which outputs a lower frequency fq. fq is low enough for microprocessor AT89S52 to calculate its periods in sampling time. Then, the calculation result N will be converted to ambiance temperature T through serial calculations according to the mathematic model. T is written into the sender RF-chip (RF401) and transmitted to the receiver. In receiver, T is shown on the LCD screen. The experimental result shows that the resolution reaches 0.001°C, and their effective communication distance reaches 80 meters. It implies that this method is right and effective, and the thermometer is of high resolution. And it realizes the telemetry of temperature. As description, this thermometer is useful for industrial detection as well as some special situations without human being entrance.

Paper Details

Date Published: 20 February 2006
PDF: 7 pages
Proc. SPIE 6041, ICMIT 2005: Information Systems and Signal Processing, 60411M (20 February 2006); doi: 10.1117/12.664341
Show Author Affiliations
Xianhe Huang, Univ. of Electronic Science and Technology of China (China)
Minqiang Li, Univ. of Electronic Science and Technology of China (China)
Qilong Rong, Univ. of Electronic Science and Technology of China (China)
Feng Wang, Tohoku Univ. (Japan)
Ping Zheng, Univ. of Electronic Science and Technology of China (China)
Feng Xie, Univ. of Electronic Science and Technology of China (China)

Published in SPIE Proceedings Vol. 6041:
ICMIT 2005: Information Systems and Signal Processing
Yunlong Wei; Kil To Chong; Takayuki Takahashi, Editor(s)

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