28 October 2006 Vibration membrane liquid density sensor
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A new vibration membrane-type liquid density sensor that is based on resonance theory is presented in order to measure the density of different kinds of liquids. This sensor, which consists of resonant membrane, exciter, and signal picking system, possess the advantages of easy fabrication, excellent repetition, high stability and fine resolving ability. Density of the liquid is measured by comparing the natural frequency variation in air and liquid respectively. In this paper, the calculating model of the sensor is simplified with one degree freedom system, in which equivalent mass me and equivalent elasticity coefficient ke are all of importance. Finally, density of water is measured at 20°C by this sensor. The measured natural frequency in air and water is 5359 Hz and 3769 Hz respectively. Corresponding Q factor (quality factor) of the sensor is in the range of 500-600. Experiment results have shown that this sensor has good repeatability and it is a kind of effective method to measure the density of liquid.
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Yuxiao Zhang, Yuxiao Zhang, Shangchun Fan, Shangchun Fan, } "Vibration membrane liquid density sensor", Proc. SPIE 6358, Sixth International Symposium on Instrumentation and Control Technology: Sensors, Automatic Measurement, Control, and Computer Simulation, 63580S (28 October 2006); doi: 10.1117/12.717798; https://doi.org/10.1117/12.717798


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