SU1472821A1 - Ultrasonic flaw detector - Google Patents

Abstract

The invention relates to the field of non-destructive testing by an ultrasonic method and can be used to control the quality of materials and products in various parts of the national economy. The aim of the invention is to increase the productivity of monitoring by automating the determination of the number of detected defects. The pulses received by the electroacoustic transducer and the pulses formed by the threshold device are counted by a binary counter. A comparison device compares their number with a predetermined for a given monitoring cycle and, in case of exceeding their number, gives a signal of the presence of a defect to the recorder, which eliminates the need for the operator to make a decision. 1 il.

Description

The invention relates to the field of non-destructive testing by the ultrasonic method and can be used to control the quality of materials and products in various sectors of the national economy.

The aim of the invention is to increase the monitoring performance by automating the determination of the number of recorded signals.

The drawing shows a structural diagram of an ultrasonic flaw detector.

The flaw detector contains a synchronizer 1 connected in series, an ultrasonic oscillator 2, an electro-acoustic transducer 3, an amplifier 4 and a threshold device 5, a gating pulse generation unit 6 connected to the second output of the synchronizer 1,

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recorder 7, serially connected binary counter 8 and comparing device 9, installation task unit 10 connected to the second input of comparator 9, the first input of binary counter 8 connected to the output of the gate forming unit 6, the second input to the output of the threshold device 5, and the output of the comparison device is connected to the input of the recorder 7.

Ultrasonic flaw detector works as follows.

The synchronizer 1 generates pulses, periodically starting the generator 2 of ultrasonic vibrations and the gate forming unit 6. Short output pulses of the gate forming unit 6 at the beginning of each cycle

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The probes reset the binary counter 8. The pulses from the generator 2, ultrasonic vibrations are fed to the electroacoustic transducer 3. The reflected ultrasonic vibrations received by the electro-acoustic transducer 3 are amplified by the amplifier 4, and then fed to a threshold device 5, which generates square pulses, if the amplitude of the received signals fluctuations exceeds the threshold.

From the threshold device 5 to the clock input of the binary counter 8 successively received received electro-acoustic transducer 3 received pulses: electrical noise at the time of radiation, the pulse reflected from the front surface, the defect echo bottom pulse. Thus, the number of incoming pulses, in the absence of a defect, is three, in the case of a defect, more than three. A comparison device 9 (digital comparator,) compares the number of pulses accumulated in binary counter 8, with the code number three specified by the setting unit 10, and when the number of pulses received on the binary counter 8 of the setting code is exceeded, the comparison device 9 generates a presence signal defect arriving at the registrar 7.

The binary counter 8 is reset to the initial state at the beginning of the next probing cycle by the leading edge of the synchronous pulse.

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five

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mash 1, selected by the gate pulse forming unit 6.

If the design of the electroacoustic converter 3 excludes the reception of an interfering pulse at the time of learning, the setpoint of the setpoint setting unit 10 is set to two.

Claims (1)

The invention makes it possible to improve the performance of the ultrasound control, since it does not require readjustment depending on the change in the distance between the electroacoustic transducer and the product, as well as on its thickness. Invention Formula An ultrasonic flaw detector containing a synchronously connected electroacoustic synchronizer, an ultrasonic oscillator, an electro-acoustic transducer, an amplifier and a threshold device, a gating pulse generation unit connected to the second synchronizer output, and a recorder, characterized in that it is equipped with serially connected a binary counter and a comparison device and a setpoint setting unit connected to the second input present device, the first input of a binary counter connected to the output strobe pulse forming unit, the second input - to the output of the threshold device, and the output of the comparator is connected to an input of the recorder.