SU1401371A1 - Ultrasonic flaw detector - Google Patents

Abstract

The invention relates to non-destructive testing methods and can be used in automated testing using an ultrasonic shadow method of products. The purpose of the invention is to increase the reliability of control by taking into account the roughness of the surface of the controlled products. In the absence of a defect, the signal at the output of amplifier 4 with an adjustable factor is less than permissible in the setpoint 16, so after the comparison block 9, the signal goes to AND 14, the second input of which is supplied with a signal from trigger 13. The output signal G of AND 14 permits regulation through synchronizer 15 amplifier 4 with adjustable gain. If there is a defect, the calculation of the required gain factor is not performed. 1 il.

Description

with

The invention relates to non-destructive methods of control and can be used for automated control of the ultrasonic shadow method of products with

The purpose of the invention is to increase the reliability of the control by taking into account the roughness of the surface of the controlled products.

The drawing shows the block diagram of the instrument.

The flaw detector contains successively Yu connected probe oscillator 1 and radiator 2, receiver 3 connected in series, variable gain amplifier 4, analog-to-digital converter 5, division unit 6, division unit 7 and register 8, the output of which is associated controlling the input of the amplifier 4 with an adjustable gain and with the second input of the multiplier 7. Flaw Detector contains

The maximum possible approach of the signal at the output of the amplifier 4 to a predetermined level (set by the operator and stored in the setting unit 16) would be.

The calculation is carried out according to the formula

IfАО. tl

 -r,

where Ktr - the required ratio;

AO - preset level (output of reference 16);

AT - current signal level;

CT - the current value of the coefficient (output register 8).

The calculated value of the coefficient is entered into the register 8 by the command of the synchronizer 15.

In the presence of a defect (a change in the signal at the output of amplifier 4 is greater than permissible), the signal from the output of block 9

also connected in series unit 9 20 prohibits the passage of the signal from the second

Comparison and indicator 10, successively connected sensor And position of radiator 2 when it is scanned by a controlled product, counter 12, trigger 13, element 14 and synchronizer 15, whose outputs are connected respectively to the control inputs of counter 12, trigger 13, block 6 division, multiplication unit 7 and register 8. The dial 16 is connected to the installation input of the counter 12, to the second inputs of the comparison block 9 and the block 6 with the second, "input element I 14.

Ultrasonic flaw detector works as follows.

When the radiator 2 is moved along the product being monitored, the pulses from the sensor 1 are fed to the counting input of the counter 12 (initially, the value of the distance between the correction points of the transmission coefficient of the amplifier 4, which is set by the aperture and stored in the setting unit 16, is recorded). When zeroing, its impulse from its transfer output triggers trigger 13, the output of which is connected to the first input of element 14. In the absence of a defect, the change in the signal at the output of amplifier 4 is less than permissible (set by the operator and stored in the setpoint 16) - the enable signal from the output The comparison unit 9 arrives at the second input of the And 14 element. The signal from the last output enables the synchronizer 15 to work, which returns to its initial position trigger 13, strobe 35

40

45

generator output 1 probe pulses. The calculation of the required coefficient is not performed, the trigger 13 remains in the cocked state, and when the defect disappears, the signal from the output of the comparison block 9 opens element 14, the signal from the latter enables the synchronizer 15 to work.

Claims (1)

Invention Formula An ultrasonic flaw detector containing a probe pulse generator and an emitter, a receiver and an amplifier with an adjustable gain, connected in series, an analog-digital converter, a dividing unit, a multiplication unit and a register, the output of which is connected to the control input of the amplifier with an adjustable gain and with the second input of the multiplication unit, a series-connected comparison unit and an indicator and setpoint device connected to the second inputs of the block d The unit and the comparison unit, characterized in that, in order to increase the reliability of the control, it is equipped with a series-connected radiator position sensor, a counter, the installation input of which is connected to the setting unit, trigger, AND element, the second input of which is connected to the output of the comparison unit, and synchronizer, adjustable gain amplifier output A recording of information from the setting device 16 B50 is connected to the inputs of the analog-digital converter 12, allows the operation of blocks 7 and a comparator unit, and the outputs 6 divisions and multiplications intended for the synchronizer are connected respectively to calculate the required ratio of the pe-to control inputs of the counter, trigger, cottages amplifier 4, in which proizoshch-blocks dividing and multiplying and register. Compiled by l. Kondrykinsk Editor A. VorovichTechred I. VeresKorrektor A. Zimokosov Order 2535/43 Circulation 847 Subscription VNIIPI State KOjViHTeTa USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab. 4/5 Production and printing company, Uzhgorod, ul. Project, 4 The maximum possible approach of the signal at the output of the amplifier 4 to a predetermined level (set by the operator and stored in the setting unit 16) would be. The calculation is carried out according to the formula IfАО. tl  -r, where Ktr - the required ratio; AO - preset level (output of reference 16); AT - current signal level; CT - the current value of the coefficient (output register 8). The calculated value of the coefficient is entered into the register 8 by the command of the synchronizer 15. In the presence of a defect (a change in the signal at the output of amplifier 4 is greater than permissible), the signal from the output of block 9  prohibits the passage of the signal from the second " five 0 five generator output 1 probe pulses. The calculation of the required coefficient is not performed, the trigger 13 remains in the cocked state, and when the defect disappears, the signal from the output of the comparison block 9 opens element 14, the signal from the latter enables the synchronizer 15 to work. Invention Formula An ultrasonic flaw detector containing a probe pulse generator and an emitter, a receiver and an amplifier with an adjustable gain, connected in series, an analog-digital converter, a dividing unit, a multiplication unit and a register, the output of which is connected to the control input of the amplifier with an adjustable gain and with the second input of the multiplication unit, a series-connected comparison unit and an indicator and setpoint device connected to the second inputs of the block d The unit and the comparison unit, characterized in that, in order to increase the reliability of the control, it is equipped with a series-connected radiator position sensor, a counter, the installation input of which is connected to the setting unit, trigger, AND element, the second input of which is connected to the output of the comparison unit, and synchronizer, adjustable gain amplifier output 0 connected to analog-to-digital inputs