SU1260262A1 - Method of automatic tuning of ultrasonic transducer - Google Patents

Abstract

The invention relates to sources of ultrasonic vibrations and can be used to excite ultrasonic vibrations. The aim of the invention is to increase the accuracy by taking into account the sign of the amplitude increment of the ultrasonic transducer. In the device that implements the method of automatic tuning of the ultrasonic transducer, when turned on, the trigger is set to one, the voltage on the output of the integrator a increases, which leads to an increase in the frequency of the generator loaded on the ultrasonic transducer. As the frequency increases, the oscillation amplitude of the converter and the signal from the sensor output also increase, the increment of the amplitude of the oscillation of the converter is positive, and the voltage on the output of the differentiator is also positive. A zero reference voltage is applied to the inverting input of the comparator. As soon as the generator frequency exceeds the resonant frequency of the transducer, the amplitude of the ultrasonic transducer will oscillate and the amplitude increment as well as the voltage at the output of the differentiator will become negative. At the output of the comparator, it turns the zero level, which translates the trigger into the zero state. Voltage on The output of the integrator and the frequency of the generator will begin to decrease. The oscillation range of the converter will begin to increase again. As the oscillator frequency becomes less resonant, the amplitude increment becomes negative. The output voltage will increase, the tegrator will begin to increase, and the work cycle will repeat. 1 il. (L

Description

one

The invention relates to a source of ultrasonic vibrations and can be used to excite ultrasonic vibrations.

The aim of the invention is to improve its accuracy by taking into account the sign of the increase in the amplitude of oscillations of the ultrasonic transducer.

The drawing shows a device that implements the method of automatic adjustment of the ultrasonic transducer. .

A device that implements a method for automatically adjusting an ultrasonic transducer contains a generator 1, an ultrasonic transducer connected to it 2. A sensor (not labeled) mounted on the ultrasonic transducer 2 and measuring the amplitude of its oscillations are connected in series with differentiator 3, comparator 4, counting trigger 5 and the integrator 6. The output of the latter is connected to the control input of the generator 1.

The device that implements the method of automatic tuning of the ultrasonic transducer works as follows.

When turned on, the trigger 5 is set to a single state, the output voltage of the integrator 6 begins to increase, which leads to an increase in the frequency of the generator 1 loaded on the ultrasonic transducer 2 .. With increasing frequency, the oscillation amplitude of the converter 2 and, accordingly , the signal from the sensor output also increases, the amplitude increment over time

positive, and the voltage on the output of the differentiator 3 is also positive. A zero reference voltage is applied to the inverting input of comparator 4, so with a positive 10

0262a

There is a high potential-sensing unit at its output at its direct input. As soon as the frequency of the generator 1 exceeds the resonant frequency of the converter 2, the amplitude of the oscillations will begin to decrease, and the amplitude increment as well as the voltage at the output of the differentiator 3 will become negative. At the output of the comparator 4 on vits zero level

A change that translates trigger 5 to zero, the state. The voltage at the output of the integrator 6 and, accordingly, the frequency of the generator 1. Begin to decrease. The amplitude of the oscillations of the converter 2 will begin to increase again, the voltage at the output of the differentiator 3 will become positive, and the output of the comparator 4 will show a single level. As soon as the frequency of the generator 1 becomes less than the resonant frequency of the converter 2, the amplitude; the oscillations will begin to decrease, the amplitude increment and, accordingly, the voltage at the output of differentiator 3 will become negative, and the output of the comparator 4 will have a zero level, which translates trigger 5 into a single state. The voltage at the output of the integrator 6 will begin to increase, and the work cycle will repeat.

Claims (1)

Invention Formula The method of automatic adjustment of the ultrasonic transducer, which consists in exciting the ultrasound transducer and the recorder to its amplitude-frequency response characteristic, that is, so that, in order to increase the accuracy, the increase in the amplitude of oscillations of the ultrasonic transducer is measured, and the generator frequency change depending on the sign of it: increments. Compiler G.Ryzhakova Editor A.Dolynich Tehred, M.Hodanich Proofreader C, Cherni. 5177/15 Circulation 647Subscribe VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., D.4 / 5 Production and printing company, Uzhgorod, Projecto st., 4