SU1696994A1 - Electroacoustic channel of ultrasonic flaw detector - Google Patents

Abstract

The invention relates to an ultrasonic inspection and can be used in flaw detectors to control materials and products in the engineering, metallurgical and other industries. The aim of the invention is to increase the resolution of the electroacoustic path of the ultrasonic flaw detector and to increase the dynamic range by performing an effective decoupling of the generator and receiver and optimal matching of the circuits of the electroacoustic path in the receive mode. This is achieved by supplying the electro-acoustic TpaKja with a transformer, the primary winding of which is connected to the generator and piezo transducer and shunted by a two-way amplitude limiter, and the secondary winding connected to the receiver input. 1 il.

Description

The invention relates to the field of ultrasound testing and can be used in flaw detectors to control materials and products in the engineering, metallurgical and other industries.

The aim of the invention is to increase the resolution of the electroacoustic path of the ultrasonic flaw detector and increase the dynamic range by performing an effective decoupling of the generator and receiver in the emission mode and optimal matching of the circuits of the electroacoustic path in the reception mode.

The drawing shows the electro-acoustic path of the ultrasonic flaw detector.

The path contains a generator 1 excitation pulses (HIV), a transformer 2, a two-level limiter 3 amplitudes, a piezoelectric transducer 4 and a receiving device 5

Transformer 2 contains the primary and secondary windings. The outputs of the primary winding of the transformer 2 are connected respectively to the output of the GIV 1 and the input of the piezoelectric transducer 4. a two-level limiter 3 amplitudes connected to the primary winding of the transformer 2 diodes 6 and 7

In the mode of radiation of the GIV 1 through a relatively small dynamic OO

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The diodes 6 and 7 energize the piezoelectric transducer 4. At the same time, only the voltage drop across the diodes, much less than the equivalent resistance of the primary winding of transformer 2, is transformed into its secondary winding, which provides an increase in the resolution of the electroacoustic path. In receiving mode, the current of the piezoelectric converter 4 passes only through the equivalent coupling of the primary winding of the transformer 2, since the voltage at the output of the piezoelectric converter is less than the cutoff voltage of the diodes 6 and 7, transformed into the secondary winding of the transformer 2 loaded on the small input junction of the receiving device 5, and increases the dynamic range of the electro-acoustic path.

Claims (1)

Invention Formula The electro-acoustic path of an ultrasonic flaw detector containing an excitation pulse generator, a receiving device, a two-level amplitude limiter and a piezoelectric transducer, characterized in that, in order to increase resolution and increase the dynamic range, it is equipped with a transformer, the primary windings of which are connected respectively to the output of the excitation pulse generator and to the input of the piezoelectric transducer, and a two-level amplitude limiter coupled pair allele with the primary winding of the transformer, the secondary winding of which is connected to the input of the receiving device. I.  J  J WITH -kn  J -I four