SU1415181A1 - Device for ultrasonic check of materials and articles - Google Patents

Abstract

The invention relates to non-destructive testing methods and can be used to control multilayer structures, products with a high attenuation of ultrasound, as well as welded joints. The purpose of the invention is to control the reliability by taking into account the parameters of the amplitude and phase spectra of a complex-modulated echo transmitted through a controlled item. In the device, using a radiating electroacoustic transducer 2, the controlled object 13 is probed by a complex-modulated acoustic signal. The echo signal from the defects is received by the receiving electroacus converter 3, combines it with the harmonic signal, and the informative parameters are selected — the amplitude and phase of the harmonic component. By changing the frequency of the reference signal, the amplitude and phase spectra of the received signal are determined, which determine the type, orientation, and geometrical parameters of the defect .., 1 sg. with (L

Description

The invention relates to non-destructive testing methods and can be used to control multilayer structures, products with a high attenuation of ultrasound, as well as welding 1 joints.

 The aim of the invention is to increase the reliability of control by taking into account the parameters of amplitude and phase; of the spectra of a complex-modulated j echo signal transmitted through a controlled product,

I The drawing shows a block diagram I of a device for ultrasonic control of materials and products.

The device contains a generator 1 of complex-modulated signals, a radiating electro-acoustic transducer 2 5, a receiving electro-acoustic transducer 3, an input I amplifier 4 and an indicator 5, a sequentially connected generator 6 of a single signal support, an analog multiplier 7 and an indicator 8, phase shifter 9 serially connected second analog multiplier 10, second integrator 11 and block 12, second generator output 1 of complex-modulated signals connected to generator 6 input of the reference signal, input force output tel 4 is connected to the first inlet; the analog multiplier 7, input: the phase shifter 9 is connected to the output I of the generator 6 of the reference signal, the output j of the input amplifier 4 is connected to the first I of the second analogue multiplier 10, the second input of which is connected to the output of the phase shifter 9,. i the output of the first integrator B is connected to the first input of the computing unit .12, the output of which is connected to the input of the indicator 5. The position 13 denotes the product under test.

I

Computing unit 12 consists of

two analog-to-digital converters, for example, of the type FCH892, whose inputs are connected to the outputs of integrators 8 and 11, respectively, and output connected to indicator 5. Computing unit 12 may contain computers, for example DZ-28, for operative processing of measurement results.

The device works as follows.

When the device starts, the generator 1 of complex-modulated signals generates a signal that can be

set as a sum of harmonic components

and i A.sinw.-t,

(one)

where is the amplitude of the i-th harmonic component; (- its frequency.

The initial phases of the harmonic components are assumed to be equal to zero. This signal arrives at the radiating transducer 2 and propagates into the test medium 13. The complex-modulated signals received from the medium by the transducer 3, after preamplification in the input amplifier 4, arrive at the first analog inputs. multipliers 7 and 10. The spectrum of a complex-modulated signal transmitted through the medium under study or reflected from a defect (depending on the control method) has undergone-. Changes - the amplitude and phase of the harmonic components change:

and

etc

,,, inp "i" (2)

where A- is the amplitude of the 1st harmonic component of the received signal} ef. „P is its phase.

The mono harmonic signals shifted from each other to It / 2 are fed to the second inputs of the analog multipliers, which are generated using the reference signal generator 6 and the phase shifter 9:

x hell sin x hell cog ai, t "

Moreover, the generator 6 of the reference signal generates a signal in phase with the generator 1 of the complex modulated signal.

The output signals from the outputs of the analog multipliers 7 and 10 are fed to the inputs of the integrators 8 and 11. After integrating these products, we have:

Z, 1 j х, and „р dt

1 h

 Y .t A; npSin (w.t + t /;)} (3)

7 t

uAl Yi AoCosw ,, ySin (w.t4-if.p). (four)

or Z

Z2

-Y i

k

.g

to,

1415181

, npH u; u) o) (5) Formula and Invention

at co s

about.

  A, A „„ р8гпЧ „PRY, w„; (6) 5

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A device for ultrasonic monitoring of materials and products, containing a complex-modulated signal generator, an emitting and receiving electroacoustic transducer, an input amplifier and an indicator connected in series to a reference signal generator, an analog multiplier and an integrator, a second generator output of complex-modulated signals, and an output The input amplifier is connected to the first input of an analog multiplier, characterized by

The determination of the informative parameters — the amplitude and phase of the harmonic component — is carried out by the calculating unit 12 according to the formulas

± - Vz

YG 1

+ Z

2

V,

arctg

Zi

(7) (8)

15

A device for ultrasonic monitoring of materials and products, containing a complex-modulated signal generator, an emitting and receiving electroacoustic transducer, an input amplifier and an indicator connected in series to a reference signal generator, an analog multiplier and an integrator, a second generator output of complex-modulated signals, and an output The input amplifier is connected to the first input of an analog multiplier, characterized by

The fact that, in order to increase the reliability of the control, it is equipped with a phasp fmnp- - 2,

The measurement results are displayed on the indicator 5. By changing the frequency Sd of the reference signal, the amplitude and phase spectra of the received signal are measured, by 2 ° C, the view, O1 centering and the second analog multiplier, the geometrical parameters of the defect are determined by series. Tegrator and computing unit.

The proposed device for ultrasonic control of materials and the shifter of the phase shifter is connected to the output of the reference signal generator, the output

compared to the known, it is possible to increase the reliability of the control due to the addition of additional informative parameters — the amplitude and phase spectrum, which makes it possible to classify defects with high accuracy, to determine their orientation, depth and thickness of the investigated products.

five

-

15

A device for ultrasonic testing of materials and products, containing a complex-modulated signal generator, an emitting and receiving electroacoustic converter, an input amplifier and an indicator, a series-connected reference signal generator, an analog multiplier and an integrator, a second output of a complex-modulated signal generator, and an input the amplifier is connected to the first input of an analog multiplier, characterized by

2 with a clamp, serially connected by a second analog multiplier, an integrator, and a computing unit.

so that, in order to increase the reliability of the control, it is equipped with a phase shifter, serially connected by a second analog multiplier, an integrator, and a computing unit.

the input of the phase shifter is connected to the output of the reference signal generator, the output

the input amplifier is connected to the first input of the second analog multiplier, the second input of which is connected to the output of the phase switch, the output of the first integrator is connected to the first input of the computing unit, the output of which is connected to the input of the indicator.

Claims (1)

Claim A device for ultrasonic testing of materials and products, containing a generator of complex modulated signals, an emitting and receiving electro-acoustic transducer, an input amplifier and an indicator, a reference signal generator, an analog multiplier and an integrator connected in series, the second output of the complex-modulated signal generator is connected to the input of the reference signal generator, and the output of the input the amplifier is connected to the first input of the analog multiplier, characterized in that, in order to increase the reliability control, it is equipped with a phase shifter, a second analog multiplier connected in series, an integrator and a computing unit, the input of the phase shifter is connected to the output of the reference signal generator, the output of the input amplifier is connected to the first input of the second analog multiplier, the second input of which is connected to the output of the phase shifter, the output of the first integrator is connected to the first input of the computing unit, the output of which is connected to the input of the indicator.