SU407523A1 - Ultrasonic pulse device for testing materials - Google Patents

Abstract

1. ULTRASONIC PULSE APPARATUS FOR ISSHTANIYA materials, preferably concrete, comprising a reference generator, a sounding pulse generator, an ultrasound transmitter and receiver, amplifier, gated sweep generator, skhemu'zaderzhki scan setting circuit zero Scheme coincidence with relay output and the cathode ray tube, wherein so that, in order to increase operational reliability and accuracy, it is equipped with a converter of the measured time interval into a digital code, a delay circuit backlight pulses and a backlight pulse selector, one of the inputs of the transducer temp gate unit is directly connected to the output of the master oscillator, and the other is connected through the interconnected delay delay circuit and the backlight pulse delay circuit, the output of which is connected to the d input of the backlight pulse selector ^ through the installation circuit zero, the input selector input is connected to the output of the generator of the waiting sweep, and the output is connected to the electron beam control electrode of the electron beam howling tube. (L

Description

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ABOUT

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2. The device according to claim 1, about the t of l and h aa that s. the purpose of entering into the measurement results of the correction for the signal delay in the radiator

and the receiver, the inputs of the generator waiting. sweep and zero setting circuits are connected in zero setting mode to the output of the master oscillator.

one

The invention relates to non-destructive ultrasonic quality control of materials and may be used in building construction.

An ultrasonic pulse device for testing materials, preferably concrete, containing a master oscillator, probe pulse generator, ultrasound emitter and receiver, amplifier, standby sweep generator, delay sweep circuit, zero setting circuit, coincidence circuit with a relay output and a cathode tube are known.

However, in the known device, periodic instrument failure is necessary, as a result of which its operational reliability and test accuracy are reduced.

In order to improve the accuracy and operational reliability when testing materials, the proposed device is equipped with a transducer of the measured time interval to a digital code, a delay circuit of illuminated pulses and a selector of illuminated pulses, one of the inputs of the temporary gateway generator is connected to the output of the generator generator directly, and the other through sequentially interconnected sweep delay circuit and backlight pulse delay circuit, the output of which is connected to the select input pa podsvetnyh pulse setting circuit through zero. The second input of the selector is connected to the output of the generator of the waiting sweep, and the output is connected to the electrode controlling the beam intensity of the electron-beam tube.

In addition, for the purpose of introducing a correction for the signal delay in the emitter and receiver, the generator inputs of the waiting sweep and the zero setting circuit are connected in the zero setting mode to the output of the master oscillator.

The drawing shows a diagram of the proposed device.

The device contains a master oscillator 1, a generator of 2 probe pulses, an emitter and a receiver 3, an amplifier 4, a generator 5 which is waiting for a sweep, a time delay circuit b, a zero setting circuit 7, a circuit

delays of illuminated pulses 8, a selector 9 of illuminated pulses, a circuit 10 coinciding with a relay output, an electron-beam tube 11, a time interval converter into a digital code including a device 12 temporal gates, a generator 13 of a reference frequency, a selector 14 of counting pulses, a counter 15 pulses and a device 16 digital indications.

The device works as follows.

The master oscillator 1 generates short sync pulses that trigger the measurement mode oscillator 2 probe pulses and the sweep delay circuit 6.

The sync pulses of the generator 1 are fed to the Start input of the device 12 temporary gates and through the sequentially connected circuits 6 sweep delays and 8 delays of the illuminated pulses to its input Stop. The pulses of the j-delay circuit-j 6 with the duration T, with its falling edge start the generator 5 waiting for the sweep and at the same time the circuit 8 of the delay of the pulse backlight, generating pulses of constant duration Hn

The duration C of a rectangular pulse generated by the temporary gate device is equal to the pulses from the output of the circuit o, additionally delayed by the value of TQ of the zero setting circuit 7, are fed to one of the inputs of the selector 9 backlit pulses, to the second input of which the rectangular pulses are output 5 sweep delayed relative to the probe pulses by the value of Cj. The output selector 9 is applied to the electrode controlling the beam strength of the cathode ray tube with a delay relative to the probe pulses,

equal to Tj + Cn - o through the material, the signal after conversion; And the gain by amplifier 4 is fed to an electron-beam tube 1G for indication and to a coincidence circuit 10. When the value of h, which ensures that the measured phase of the signal passing through the material coincides with the beginning of the scanning line, and T is equal to the ultrasonic signal delay time in the transducers, the measured interval Tp is equal to Cp. The pulse duration at the exit of the device 12 time gate converts into digital code. For this, it is fed to one of the inputs of the selector 14 of the counting pulses, to the second input of which a sequence of pulses of the generator 13 of the reference frequency is fed. The output select.or 14 is connected to the input of the counter 15 pulses. The number of pulses of the reference frequency, counted by the counter 15 for the duration of the output pulse duration of the device 12, is indicated on the digital indicators of the 16-digit display device and corresponds to the measured time interval fp. To signal the coincidence of the set value of the propagation time of the leading edge of the signal, preliminarily set by digital indicators by adjusting the sweep delay control unit with the measured value, the input of the coincidence circuit / s 10 is connected to the output of the device 12 time gate (the second input is connected to the output of the amplifier 12 four ). The output pulses of circuit 10 are used to signal the instant of coincidence, as well as to turn on the executive relay. In the Zero setting mode, the start of the standby sweep generator 5 is carried out directly from the pulses of the driving oscillator 1, which also arrive at the input of the zero setting circuit 7. As a result, the output of the latter produces a rectangular impulse of duration Cp, which begins without delay in relation to the probing impulses. These pulses are applied to the input of the selector 9 of the illuminated pulses. By adjusting the pulse duration t of the zero setting circuit, the leading edge of the received signal is combined with the start of the sweep with converters connected to each other and thus set a value equal to the signal delay in them.

Claims (2)

• (5 4) 1. ULTRASONIC PULSE DEVICE FOR TESTING MATERIALS, mainly concrete, containing a master oscillator, a probe pulse generator, an ultrasonic emitter and receiver, an amplifier, a standby oscillator, a scan delay circuit, a zero-setting circuit, a relay output matching circuit, and cathode ray tube, characterized in that, in order to increase operational reliability and accuracy, it is equipped with a converter of the measured time interval into a digital code, a delay circuit of the backlight imp lsov and selector podsvetnyh pulses, wherein one of the inputs of unit inverter time gate connected to the output of the master oscillator directly, and the other - through the consecutively connected among themselves sweep delay circuit and a circuit delay podsvetnyh pulses, the output of which is coupled with _a input selector podsvetnyh pulses £ through the circuit zero, the second input of the selector is connected to the output of the standby generator, and the output to the electrode controlling the brightness of the beam of the cathode ray tube. SU, ... 407523 .407523 2. The device pop. 1, characterized in that, with. in order to enter into the measurement results corrections for the signal delay in the emitter and receiver, the inputs of the standby oscillator and the zero-setting circuit are connected in the zero-setting mode to the output of the master oscillator.