A general ultrasonic emitting device and method

Abstract

The invention relates to an ultrasonic transmitting device and an ultrasonic transmitting method. The device comprises a signal generation module, a signal amplitude amplifier module, a buffer amplifier module, a totem-pole power amplifier module, an average-current module, an ultrasonic transducer parameter matching module, an overvoltage protection module and a processor module. Not only can a high-voltage alternating-current signal be generated for a 3.3V or 5V direct-current signal output by the processor module, an ultrasonic transducer is excited to generate ultrasonic waves, and but also, impedance matching can be carried out according to resonant frequency of the ultrasonic transducer simultaneously. The device can output a continuous wave or an impulse wave, and the number of pulses and the cycle number can be set at random. Simultaneously, the device can conveniently carry out circuit impedance matching conveniently according to the resonant frequency of the ultrasonic transducer. The whole device has small volume, light weight, low manufacturing cost, and working efficiency of about 60 percent.

Description

technical field [0001] The present invention relates to non-contact measurement fields such as flow measurement, distance measurement, flaw detection, etc., and particularly relates to an ultrasonic transmitting device and method, which uses a standard 3.3V or 5V DC signal provided with a processor to generate a high-voltage AC signal to excite ultrasonic emission and transduction The device generates an ultrasonic signal. Background technique [0002] At present, many flow measurement and non-destructive testing devices developed based on ultrasonic technology in China often have large measurement errors due to external environmental interference during work, especially in the case of strong external noise such as frequency converters and high-power motors. , often does not work properly. The main reason is that the output amplitude of the transmitting signal of the transmitting circuit of the ultrasonic flowmeter is too small, and the external environmental noise often su...

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Problems solved by technology

[0003] There are basically two methods for generating high-voltage ultrasonic excitation signals at home and abroad: one is the ultrasonic transmitting device composed of thyristors, its transmitting frequency is very low, and the pulse repetition frequency is below 30KHz; the second is the ultrasonic transmitting device composed of VMOS transistors , due to the VMOS gate capacitance, its resonant frequency can only reach a few hundred kHz

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