Besonance sensor for measuring liquid density

Abstract

A resonant sensor for measuring liquid density, which includes a diaphragm, a diaphragm base, a piezoelectric exciter, a piezoelectric pickup, a diaphragm circuit box, a flange structure of a diaphragm case, and an end cover. In the structure of the diaphragm, the diaphragm processing must ensure the flatness and parallelism of the two planes of the diaphragm. The diaphragm and the diaphragm base are welded into a whole by vacuum electron beam welding. The flange structure of the diaphragm box and the diaphragm The base is connected by threads, the piezoelectric vibrator and the piezoelectric vibrator are glued on the same side of the diaphragm respectively, and the diaphragm circuit box and the diaphragm base are connected by threads. The system has the advantages of high measurement accuracy, stability and reliability, simple structure and small volume.

Description

Technical field [0001] The invention relates to a resonance type measuring liquid density sensor, which is used for measuring liquid density. Background technique [0002] At present, many researchers have been studying the method of measuring density using the resonance principle, but most of them are in the research and development stage and have not yet reached the stage of finalization. Since the measurement of density is often affected by temperature and pressure, in addition to measuring the mass and volume, the pressure and temperature must also be accurately measured. Chinese Patent No. 89217849.3 discloses a vibrating diaphragm density sensor. Its diaphragm is fixed on the base by a die, and there is an inclined attenuation band between the fixed periphery and the effective vibrating surface, and the diaphragm is separated. The vibration exciter of the type density sensor uses electromagnetic coils, and the vibration pickup uses semiconductor strain gauges, and they must...

AI Technical Summary

Problems solved by technology

Chinese patent 89217849.3 discloses a vibrating diaphragm density sensor. Its diaphragm is fixed on the base through a die, and there is a slope attenuation band between the fixed periphery and the effective vibration surface, and it is separated. The vibrator of the type density sensor uses an electromagnetic coil, and the vibrator uses a semiconductor strain gauge, and it must be installed on both sides of the diaphragm. If the density of the liquid is to be measured, both sides of the diaphragm must be in contact with the liquid. , in fact, this structure needs to be completely insulated for protection, otherwise it will affect the accuracy of the measurement, and the work is not easy to be stable and reliable

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