Ultrasonic signal receiving and detecting circuit and application

Abstract

The invention discloses an ultrasonic signal receiving and detecting circuit. The ultrasonic signal receiving and detecting circuit comprises a metal electrode used for receiving ultrasonic signals and a signal processing circuit connected with the metal electrode, wherein the signal processing circuit comprises a rectifier and filter circuit, a signal amplification circuit, a filter circuit and asingle chip microcomputer circuit, the signals received by the metal electrode are rectified and filtered by the rectifier and filter circuit and then enter the signal amplification circuit to be amplified, and the amplified signals are further filtered and then transmitted to a single chip microcomputer to be processed. The circuit is applied to anhydrous power-off protection of ultrasonic atomized sheets, and the ultrasonic signals of the ultrasonic signal receiving and detecting circuit are received by adopting the metal electrode. According to the ultrasonic signal receiving and detectingcircuit, the ultrasonic signals are received by adopting the metal electrode, and the metal electrode is adopted to be in cooperation with the signal processing circuit to achieve detecting and processing on the ultrasonic signals; and the ultrasonic signal receiving and detecting circuit is applied to anhydrous detection of the ultrasonic atomized sheets and not corroded and oxidized by liquid,the lift is long, the detection precision is high, problems are not prone to occurring, application is flexible, and the cost is low.

Description

Technical field [0001] The invention belongs to the technical field of ultrasonic applications, and specifically relates to an ultrasonic signal receiving and detecting circuit and application. Background technique [0002] At present, humidifiers usually use microporous piezoelectric ceramic ultrasonic atomizers to atomize water. Its working principle is to use the high-frequency oscillation of the ultrasonic atomizers to generate cavitation on the water and break up the molecular structure of liquid water. The ethereal mist. [0003] Ultrasonic atomizer is a key component of humidifier. If it lacks water, it will be damaged by dry burning. Therefore, humidifiers are basically equipped with water-free power-off protection devices. At present, the commonly used one is to cooperate with reed pipes. Detection method of floating magnetic ring. The other is the surface probe detection method. The reed switch and the floating magnetic ring detection method and the detection method of...

AI Technical Summary

Problems solved by technology

The reed switch combined with the floating magnetic ring detection method and the detection method of the water surface probe are all in direct contact with the liquid surface, and the corrosion resistance and oxidation resistance of the material are strictly required. Corrosion and oxidation will inevitably occur after a period of time, resulting in detection failure, resulting in dry burning and damage to the atomizer

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