Full range hydrogen concentration detection method based on ultrasonic vibration transmission

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Journal of Vibration and Shock ›› 2022, Vol. 41 ›› Issue (15) : 83-89.

SUN Hui1, SUN Kai2, SHI Yunbo1, DING Xin1, DING Xibo1

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Abstract

Using ultrasonic phase difference of vibration transmission detection technology can achieve high accuracy and low cost hydrogen concentration detection in harsh environment. When the hydrogen concentration changes greatly, the measured phase difference will cross more cycles. The traditional ultrasonic phase detection technology can only detect the phase change within 2π of a single period. To solve this problem, this paper proposes a multi-frequency ultrasonic phase difference method to realize hydrogen detection. By loading multi-frequency signal to obtain the phase difference of low-frequency envelope signal, and combining with the single period phase difference of high-frequency signal, the total phase difference across the cycle is obtained, which solves the problem that the cross-cycle phase difference cannot be detected when the ultrasonic phase difference is greater than 2π, and realizes the hydrogen concentration detection from low concentration to high concentration to full range based on ultrasonic vibration transmission technology. The experimental results show that the relative error is less than 2.1% when the concentration of hydrogen is below 4%, and the relative error is less than 8% when the concentration of 90%.
Key words: phase difference measurement; hydrogen concentration measurement; ultrasonic vibration; cross-period detection

Key words

phase difference measurement / hydrogen concentration measurement / ultrasonic vibration / cross-period detection

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SUN Hui1, SUN Kai2, SHI Yunbo1, DING Xin1, DING Xibo1. Full range hydrogen concentration detection method based on ultrasonic vibration transmission[J]. Journal of Vibration and Shock, 2022, 41(15): 83-89

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