Wireless temperature and humidity sensor and system and measuring method

A technology of humidity sensor and wireless temperature, applied in the field of temperature and humidity sensor, can solve the problem of not including temperature or humidity detection function, unable to realize passive wireless sensor and so on

Active Publication Date: 2013-01-02
SHANGHAI SAIHE INFORMATION TECH CO LTD +1
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The invention requires the transmission of a lower frequency beat signal by wire and contains active peripheral circuits, m...

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  • Wireless temperature and humidity sensor and system and measuring method
  • Wireless temperature and humidity sensor and system and measuring method
  • Wireless temperature and humidity sensor and system and measuring method

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Embodiment Construction

[0033] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but only to illustrate the essence of the technical solutions of the present invention.

[0034] figure 1 A schematic structural top view of the wireless passive temperature and humidity sensor 100 of the present invention is shown. Such as figure 1 As shown, the sensor 100 includes: a piezoelectric substrate 106 , an integrated antenna 104 , a feed network 105 , a temperature measurement oscillator 101 , a reference oscillator 102 , and / or a humidity measurement oscillator 103 . Wherein, the temperature measurement oscillator 101 and the humidity measurement oscillator 103 are measurement oscillators. The piezoelectric substrat...

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Abstract

The invention provides a wireless temperature and humidity sensor and system and a measuring method. The wireless temperature and humidity sensor comprises a substrate, a feed network, an antenna and an acoustic surface wave oscillator, wherein the acoustic surface wave oscillator carries out feed through the feed network by using the antenna; the acoustic surface wave oscillator comprises a reference oscillator and a measuring oscillator; and the resonant frequency difference value between the reference oscillator and the measuring oscillator is used for encoding temperature and/or humidity to be measured. The system can simultaneously monitor temperature and humidity, or selectively monitor humidity or temperature. In addition, the resonant frequency drift of the sensor in the process of differential encoding because of the aging of materials and connectors is effectively suppressed, thereby improving the long-term stability of measuring and avoiding the calibration in the process of application.

Description

technical field [0001] The invention relates to a wireless sensor, in particular to a temperature and humidity sensor using a surface acoustic wave oscillator. Background technique [0002] Surface acoustic wave (Surface Acoustic Wave—SAW) sensor is a sensor with SAW as the information sensitive carrier. It has the characteristics of high sensitivity precision, fast response time, wide application range and small size. , pharmaceutical chemical industry, process monitoring, military security and other fields have been widely used, and SAW sensors have shown unique technical advantages. [0003] At present, there are many kinds of surface acoustic wave multi-parameter sensors. For example, Chinese utility model patent No. CN201837405U discloses a reflective pulse signal surface acoustic wave sensor. The wireless pulse signal sent by the telemetry device is received by the sensor antenna and drives the interdigital transducer. The transmitter generates radio frequency surface...

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Application Information

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IPC IPC(8): G01K11/22G01N29/036
CPCG01K11/265G01N2291/02845G01N29/30G01N29/2481G01N29/036G01K11/22G01N2291/0423G01N2291/02881G01N29/022G01K7/32G01N29/2462
Inventor 郑启洪李泽晨
Owner SHANGHAI SAIHE INFORMATION TECH CO LTD
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