Reflection type small blind zone supersonic detector based on multi-frequency

Abstract

A reflection-type small blind area supersonic detector based on multi-frequency belongs to the technology field of detection. The detector adopts a universal ultrasonic probe (sensor) to realize the detection of the small blind area or non-blind area. The ultrasonic probe of the detector has no more than two operating frequencies, wherein a frequency f1 works in the transmission band (at or near natural frequency) of the ultrasonic probe, and the other frequency f2 works out of the transmission band of the ultrasonic probe. The frequency f2 is adopted to detect the measurement of a small range, and the small detection range thereof is in or near the blind area of the frequency f1 detection. Since the frequency f2 is not near a resonance point, emission signals have little direct impact on receiving signals, and the probe mainly receives reflection signals, thus greatly reducing the blind area. The reflection type small blind area supersonic detector based on multi-frequency of the invention can also improve the long-distance detection performance of the frequency f1.

Description

Ultrasonic Detector Based on Multi-Frequency Reflective Small Blind Area technical field The technology belongs to the detection technology field. Background technique Due to the influence of the transmitted signal on the received signal during the detection of the reflective ultrasonic sensor, there is always a certain measurement blind area. The ordinary ultrasonic probe works at its resonance point, that is, at the working frequency. At this frequency, its The maximum transmission power and the highest reception sensitivity are used to obtain the ideal measurement range, but at the same time, it also brings measurement blind spots that cannot be eliminated in principle. Some people use the method of changing the transmission power to reduce the blind area, that is, in a small range, reduce the transmission power to reduce the influence of the transmitted signal on the received signal. However, this method is not ideal due to the defects in the principle and the complex...

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Problems solved by technology

However, due to the defects in the principle of this method and the complex implementation of the circuit, the effect is not ideal.

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