Ultrasonic transducer and ultrasonic ranging module

Abstract

The invention discloses an ultrasonic transducer. The ultrasonic transducer comprises a shell, a supporting ring, a piezoelectric wafer, pins, a conical resonance disc and a metal wire mesh enclosure.The shell comprises an accommodating cavity, a horn and a phase plug; the accommodating cavity is connected with the loudspeaker; the phase plug is arranged in the horn; the supporting ring is arranged in the accommodating cavity; a piezoelectric wafer, a conical resonance disc and a metal wire mesh cover are sequentially arranged on one side of the supporting ring; wherein the piezoelectric wafer is arranged on the supporting ring in a supporting mode, the conical resonance disc is arranged on the piezoelectric wafer, the metal wire mesh enclosure is connected with the cavity wall of the accommodating cavity, and the pin is arranged on the other side of the supporting ring and penetrates through the supporting ring to be connected with the piezoelectric wafer. The horn structure of the shell improves the directivity of an ultrasonic wave beam and the acoustic load characteristic of a vibration part of the transducer, and ultrasonic waves passing through the horn have a specific wavebeam angle and are radiated into air. The invention also provides an ultrasonic ranging module.

Description

technical field [0001] The invention relates to the field of ultrasonic ranging, in particular to an ultrasonic transducer and an ultrasonic ranging module. Background technique [0002] Ultrasound is a useful technique for odometry or distance measurement of objects of interest. Ultrasonic ranging involves the emission of ultrasound waves from an ultrasound source towards an object of interest. Ultrasound is reflected from the object of interest and transmitted back to the source of the ultrasound. Since sound has a relatively constant velocity, the travel time for an ultrasound pulse to reflect from the object of interest and return to the source of ultrasound is proportional to the distance between the source and the object. Thus, by measuring the travel time of the ultrasound pulse, the distance can be determined. [0003] When ultrasonic ranging is applied to height measurement, an ultrasonic height measuring instrument is produced, which replaces the traditional mec...

AI Technical Summary

Problems solved by technology

However, for ultrasonic height measuring instruments, the fuselage is relatively high, and the fuselage of commercial ultrasonic height measuring instruments is provided with a coin slot. To the fuselage or the coin slot, the reflected echo forms clutter, which affects the accuracy

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