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Based on the ultrasonic resonator hydrogen detection system research and design

Author: YangQian
Tutor: HuangXianHe
School: University of Electronic Science and Technology
Course: Detection Technology and Automation
Keywords: Hydrogen detection Ultrasonic resonator Sensor Telemetry
CLC: TP274
Type: Master's thesis
Year: 2010
Downloads: 54
Quote: 0
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Abstract


More and more widespread application of gas detection technology in the world today , but always unsatisfactory performance of the gas detection system , high stability , corrosion resistance , low sensitivity is the main problem plagued the gas detection system , and in the protection of detection enough personnel safety considerations . Four times starting from hydrogen at home and abroad detection research , analysis of the difference of the acoustic characteristics of hydrogen with other gases , under the same condition , the sound velocity of the air is about 1/4 of hydrogen , the acoustic impedance of approximately hydrogen . Significant difference between the hydrogen and air on the acoustic characteristics of quartz as a piezoelectric material , and uses the way of working of the bimorph electrodes , using a positive inverse two piezoelectric effect , the resonant frequency of a different concentration of hydrogen is detected . Different from a conventional semiconductor-type gas sensors , under conditions to ensure high stability , that the sensor does not need to use a gas - sensitive element as sensing materials to be detected , but by the gas itself is the difference of the acoustic characteristics . Has greatly improved the detection sensitivity and resistance to corrosion . Designed in this paper based on the the ultrasonic resonator hydrogen detection system including hydrogen gas detection module , the signal processing module , wireless transceiver module and display module . The hydrogen gas sensor of the current hydrogen concentration n convert the output of the frequency f (n) , and after mixing, to obtain a lower frequency . This frequency can be fed directly to the microcontroller counts, by mathematical calculation model in the count value n is converted into hydrogen concentration code . The hydrogen concentration yards through a wireless transceiver chip nRF401 transceiver , and finally displayed on the LCD . Based the ultrasonic resonator hydrogen detection system design effective communication distance up to 50 meters . Detection system as the core control devices to the microcontroller , the choice of a highly integrated , low -power micro- processing unit , a compact design , reduce system size and power consumption , and telemetry , ultrasonic resonator - based hydrogen the detection system can be applied to industrial inspection especially some human beings can not enter or inconvenience occasions , and has a strong practicality and economy .

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