High-precision ultrasonic distance measuring device and method based on phase detection

Abstract

The invention relates to a high-precision ultrasonic ranging module device and method based on phase detection. The device includes: an ultrasonic transducer at a transmitting end and an ultrasonic transducer at a receiving end; a timing control module that generates a high-frequency square wave signal; The ultrasonic amplitude modulation generator is used to perform low-frequency amplitude modulation on the high-frequency square wave signal to generate an amplitude modulation signal with the high-frequency square wave as the carrier; the ultrasonic drive circuit is used to amplify the power of the amplitude modulation signal , and drive the ultrasonic transducer at the sending end to generate low-frequency amplitude-modulated ultrasonic waves; the ultrasonic zero-phase reference signal circuit is used to generate a zero-distance reference signal; the ultrasonic signal amplification and filtering circuit is used to amplify and lower the target echo signal Pass filtering; echo phase detection circuit, used to convert the phase difference between the low-pass filtered target echo signal and the reference signal whose phase difference is zero into a DC voltage signal; the distance calculation module, used to convert the phase difference according to the DC voltage signal Calculate the distance to the target.

Description

technical field [0001] The invention relates to distance measurement technology, in particular to a high-precision ultrasonic distance measurement device and method based on phase detection. Background technique [0002] At present, there are three types of non-contact distance measurement based on light waves, microwaves and ultrasonic waves. Among them, the ultrasonic ranging sensor is a low-cost, easy-to-integrate non-contact ranging device that is insensitive to changes in light and electromagnetic environments. In the fields of robot navigation, robot obstacle avoidance, automobile collision avoidance, industrial height detection, medical imaging, etc., ultrasonic ranging has been widely used. [0003] Most of the existing ultrasonic ranging sensors are based on the time-of-flight method. Although this method is simple and easy to implement, it has problems such as low precision, susceptibility to noise interference, and large blind spots. The principle of the time di...

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Problems solved by technology

[0004] The purpose of the present invention is to solve or optimize at least part of the technical problems in the prior art, and provide a high-precision ultrasonic distance measuring device and method based on phase detection

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