Digital telemetry thermometer based on quartz crystal sensor

Xianhe Huang; Minqiang Li; Qilong Rong; Feng Wang; Ping Zheng; Feng Xie

doi:10.1117/12.664341

20 February 2006 Digital telemetry thermometer based on quartz crystal sensor

Xianhe Huang, Minqiang Li, Qilong Rong, Feng Wang, Ping Zheng, Feng Xie

Proceedings Volume 6041, ICMIT 2005: Information Systems and Signal Processing; 60411M (2006) https://doi.org/10.1117/12.664341
Event: ICMIT 2005: Merchatronics, MEMS, and Smart Materials, 2005, Chongqing, China

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 f_q. f_q 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.

Citation Download Citation

Xianhe Huang, Minqiang Li, Qilong Rong, Feng Wang, Ping Zheng, and Feng Xie "Digital telemetry thermometer based on quartz crystal sensor", Proc. SPIE 6041, ICMIT 2005: Information Systems and Signal Processing, 60411M (20 February 2006); https://doi.org/10.1117/12.664341

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KEYWORDS

Crystals

Quartz

Sensors

Receivers

Anisotropy

Signal processing

Temperature metrology

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