SU916980A1 - Ultrasonic measuring device for linear dimension determination - Google Patents

Description

(54) ULTRASONIC MEASURING DEVICE FOR DETERMINING LINEAR DIMENSIONS

one

The invention relates to non-destructive testing and can be used for ultrasonic testing of the dimensions of parts and movements of parts of mechanisms; working in conditions of increased pollution of the environment, for example, in the tire industry.

A device for determining the linear dimensions of objects is known, comprising an ultrasonic emitter connected to a generator, an ultrasonic receiver connected to a measuring unit, and a movable mechanical system that houses an ultrasonic receiver and emitter in contact with the measured item 1.

However, this device does not provide 15 high precision controls.

The closest to the present invention is an ultrasonic measuring device for determining linear dimensions, comprising an ultrasonic, 0 sound pulse formation circuit in the form of a series-connected ultrasonic emitter, an amplitude modulator and an ultrasound generator, and a measurement circuit in the form of a series-connected ultrasound

receiver, filter element and measuring unit 2.

However, using a known device, it is not possible to determine the linear dimensions and movements of fixed items.

The purpose of the invention is to determine the linear dimensions of fixed products.

This goal is achieved by the fact that an ultrasonic measuring device for determining linear dimensions, containing the formation of an ultrasonic pulse in the form of a series-connected ultrasound transducer, an amplitude modulator and an ultrasound generator, and a measurement circuit in the form of a series-connected ultrasound receiver, filter element and a measuring unit, equipped with a mechanical scanning system, which is rigidly fixed ultrasonic receiver and emitter, and the latter th made focusing.

In addition, the ultrasonic pulse formation circuit is equipped with an additional focusing ultrasound emitter mounted on a mechanical scanning system on a fixed

the distance from the main ultrasound transducer and switched on electrically in parallel with it.

The drawing shows the scheme of the proposed ultrasonic measuring device.

The mechanical scanning system is completed in the form of a vibro-impact scanner with an electromagnetic excitation system consisting of two magnetic cores 1 with excitation windings 2, and a core spring 3, which is a double spring parallelogram carrying shock mass 4 with a focused source 5 on it ultrasonic beam and ultrasound receiver 6. Moreover, the shock mass 4 is symmetrically located between the rigid limiters 7. The ultrasonic pulse formation circuit contains a carrier frequency generator 8 connected via an amplitude modulator 9 to the ultrasound beam source 5, and the measurement circuit consists of an ultrasound receiver b connected through a low clamp 10 frequency with the block 11 measurement. An additional source 12 of a focused ultrasound beam can be mounted on the impact mass 4.

Ultrasonic measuring device operates as follows.

A sinusoidal voltage is applied to the windings 2 of the excitation system, as a result of which an alternating magnetic field arises in the magnetic cores 1, under the action of which the shock mass 4 contributes to the scanning movement between the hard limiters 7. The shock mass 4 moves according to the sawtooth law. From the carrier frequency generator 8, an electrical signal is fed to an amplitude modulator 9. As a result of the modulation, high-frequency ultrasound pulses are generated that follow the low frequency of the ultrasonic range and are emitted by the scanning source 5 of the focused ultrasound beam as probe pulses. size or movement by installing the scanning element at an appropriate distance. The use in the vibro-impact scanner as an elastic system of a double spring parallelogram allows the axis of the focused ultrasound beam to be moved in parallel

itself with high accuracy, thereby reducing when receiving the distortion of the number of reflected packets of high-frequency pulses due to the angular oscillations of the beam axis. These reflected-from high-frequency ultrasound pulses reflected from the measured objects are captured by the ultrasound receiver 6 with a certain delay t, depending on the time of propagation of sound waves from the scanning element to the reflecting surfaces of the object and back. Then, the received signals are demodulated by the low-pass filter 10 and, by their number, set by the measuring unit 11, the size or movement of the measured object is determined.

Thus, the proposed ultrasonic measuring device allows determining the linear dimensions of fixed objects with high accuracy.

Claims (2)

1. An ultrasonic measuring device for determining linear dimensions, comprising an ultrasonic pulse generation circuit in the form of a serially connected ultrasonic transducer, an amplitude modulator and an ultrasonic generator, and a measurement circuit in the form of a serially connected ultrasonic receiver, filter element and measuring unit, characterized in that in order to determine the linear dimensions of fixed products, it is equipped with a mechanical scanning system, on which are rigidly fixed ul of an ultrasonic emitter and receiver, and the latter is made focusing. 2. The ultrasonic measuring device according to claim 1, characterized in that the ultrasonic pulse forming circuit is provided with an additional focusing ultrasound transducer mounted on a mechanical scanning system at a fixed distance from the main ultrasonic transducer and switched on electrically in parallel with it. Sources of information taken into account in the examination 1. USSR author's certificate number 115760, cl. G 01 B 17/02, 1954. 2. USSR author's certificate No. 563565, cl. G 01 B 17/02, 1974 (prototype). but / x x x // Ad r ///////// X