A Segmented Intelligent Frequency Sweep Method for Ultrasonic Signal Generator

Abstract

The invention relates to a segmented intelligent frequency scanning method for ultrasonic signal generators, and the method is applied to an ultrasonic signal generator connected with N ultrasonic transducers, wherein N is a natural number greater than or equal to 2. The method is characterized by comprising the following steps of: 1, a parameter presetting stage: setting parameters such as a frequency scanning start frequency fstart, a stop frequency fstop, a frequency scanning interval fstep, a pre-scanning frequency Ninit, a relative frequency difference RFD and a relative frequency step RFS; 2, a pre-scanning initializing stage: detecting fixed vibration frequencies of the N ultrasonic transducers connected with the ultrasonic signal generator at the same time, and sorting the fixed vibration frequencies of the N ultrasonic transducers in an ascending order; and 3, an intelligent frequency scanning stage: carrying out skip type or linear frequency scanning according to relative frequency difference between adjacent fixed frequencies fi and fi+1. Compared with the prior art, the method has the advantages that frequency matching driving for multiple transducers can be realized insequence, and the problem of frequency mismatching when the ultrasonic signal generator drives multiple transducers at the same time is solved.

Description

Technical field [0001] The invention relates to a segmented intelligent frequency sweeping method of an ultrasonic signal generator. Background technique [0002] Existing ultrasonic signal generators can basically be divided into two categories: fixed frequency driven ultrasonic signal generators and intelligent frequency tracking ultrasonic signal generators. The ultrasonic signal generator driven by a fixed frequency sets the corresponding parameters of the ultrasonic signal generator according to the predicted characteristics of the transducer to generate a driving signal of a certain fixed frequency to drive the transducer to output a larger ultrasonic power or a fixed output Frequency of ultrasound. The ultrasonic signal generator with intelligent frequency tracking can detect the real-time working state parameters of the transducer, adaptively adjust the frequency of the drive signal to track the change of the natural frequency of the transducer, so as to drive the transd...

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Problems solved by technology

[0003] Most of the existing ultrasonic transducers are made of piezoelectric ceramics. Due to the subtle differences in the materials and the incomplete consistency of the processing technology, even the ultrasonic transducers produced in the same batch will have obvious differences in their natural vibration frequencies. , and its natural vibration frequency will drift with the change of working conditions in the actual use process

For an ultrasonic signal generator driven by a fixed frequency, when its working parameters are set, its driving frequency is fixed and cannot flexibly adapt to the vibration frequency of each transducer

For the ultrasonic signal generator with intelligent frequency tracking, although the frequency of its output driving signal can intelligently track the change of the natural frequency of the ultrasonic transducer, its intelligent tracking scheme is designed according to the characteristic index of a transducer However, it cannot meet the requirements of tracking and driving multiple ultrasonic transducers at the same time

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