Precision fastresponse resonant quartz temperature sensor for underwater detection

Abstract

The invention provides a precise and fast-response resonant quartz temperature sensor suitable for underwater detection. It includes a quartz thermal resonator 3 and a software and hardware circuit 10 of a single-chip microcomputer. The quartz thermal resonator 3 and the software and hardware circuits 10 of the single-chip microcomputer are connected through inner leads 5 and installed in a gold-plated brass blind tube 2. The gold-plated brass A water-resistant resin sealing cylinder 17 is arranged outside the blind pipe, and the front end of the water-resistant resin sealing cylinder 17 is installed with a protective fence 1 formed by at least two stainless steel wires crossing the gold-plated brass blind pipe, and the software and hardware circuits 10 of the microcontroller pass through. The silicone rubber cable 12 is led out, and a sealing mechanism is provided between the gold-plated brass blind tube and the water-resistant resin sealing cylinder and between the silicone rubber cable and the gold-plated brass blind tube and the water-resistant resin sealing cylinder. The invention has the advantages of good resolution, high accuracy, few parasitic modes, strong resistance to mechanical vibration and impact, fast response speed, and is suitable for long-term underwater use.

Description

(1) Technical field [0001] The invention relates to a temperature sensor, especially a digital signal output, high sensitivity, fast response, precise and highly stable resonant sensor suitable for underwater use such as acoustic depth sounder, sonar, earthquake monitoring or geothermal anomaly detection. type quartz crystal temperature sensor. (2) Background technology [0002] The resonant quartz crystal temperature sensor is a high-precision, high-stability digital temperature sensor. The output signal is frequency, the resolution is very high, the temperature drift is very small, the change of the power supply voltage has little effect on the temperature measurement accuracy, and the long-term stability is good. The stability is as high as 0.02℃ / year. There are many Chinese patents about this technology, for example: the patent application number is 94243623.7, the name is "high-sensitivity quartz temperature sensor"; the patent application number is 95236820.X, the na...

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Problems solved by technology

Therefore, not only the response speed is slow, but also the temperature of the tiny space cannot be accurately detected

[0005] 2. Due to the large size of the chip, and most of the packaging adopts TO-5 or 49U shells, and the mounting form is a suspension structure, the resistance to mechanical vibration and impact is poor.

[0011] Obviously, the above-mentioned quartz temperature sensor is difficult to obtain the characteristics of high pressure resistance, watertightness, high precision, high stability, and fast response, so it cannot fully meet the needs of acoustic depth sounders, sonar, earthquakes, and geothermal anomaly monitoring of earthquake precursors. Requirements for precision thermometers

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