SU588498A1 - Ultrasound velocity meter - Google Patents

Description

sound or a parameter proportional to it, such as concrete strength, which eliminates the unproductive manual operation of recalculating the propagation time of ultrasonic vibrations into velocity values.

This goal is achieved by the introduction of a control interval forming unit with its inputs connected to the outputs of the synchronizer and a generator of counting pulses, as well as a time discriminator connected by its inputs to the outputs of the measured time interval and the control interval generation unit, and the output to input generator counting pulses.

FIG. 1 shows a block diagram of the device; in fig. Figure 2 shows the voltage plots that illustrate the operation of the device.

The ultrasound velocity meter consists of a synchronizer connected to one of the inputs of the control interval formation unit 2, the second input of which is connected to the output of the generator 3 counting pulses. The output of the unit 2 is connected to the input of the generator 4 of ultrasonic vibrations, loaded on the transmitting electro-acoustic transducer 5, mounted on a controlled product 6.

The receiving electroacoustic transducer 7 is connected to the input of an amplifier 8, the output of which is connected to the input of the Shaper 9 of the measured time interval, whose input of the Start is connected to the output of the control interval formation unit 2.

The output of the generator 9 of the measured time interval is connected to one of the inputs of the time discriminator 10, the second input of which is connected to the output of the control interval formation unit 2. The output of the time discriminator 10 is connected to the input of the generator 3 counting pulses, the output of which is connected to one of the inputs of the selector 11, the second input of which receives a signal from the output of the generator 12 of the calibration time interval. The output of the selector 11 is fed to the input of a counting device with digital indicators 13.

The proposed speed meter works as follows.

The synchronizer 1 develops an uninterrupted sequence of pulses (Fig. 2, a) arriving at one of the inputs of the control interval generation unit 2, the second input of which receives the pulses of the counting pulse generator 3 (Fig. 2.6}. The output of the control interval formation unit 2 a sequence of pulses is generated (Fig. 2, c), the duration of which is equal to the period of the pulse of the generator 3 counting pulses, and the frequency of the pulse corresponds to the frequency of the pulses of the synchronizer 1. The leading edge of the pulse of the block 2 forming the control interval, the generator 4 is started (Fig. 2, d), which excites ultrasonic oscillations in the transmitting electroacoustic transducer

5, emitting them in a controlled sample

6. A receiving electroacoustic transducer 7 converts the pulses of ultrasonic vibrations that have passed the test sample 6 into electrical pulses and supplies them to the input of the amplifier 8, from the output of which (Fig. 2, e) the signals come in: Stop

shaper 9 of the measured time interval, to the input of which start pulses come from the output of the control interval formation block corresponding to the leading edge of the pulse generated by it.

Thus, at the output of the imaging unit of the measured time interval, pulses are obtained (Fig. 2, e), the duration of which is equal to the transit time of ultrasonic vibration pulses in the test sample 6. These pulses arrive at one of the inputs of the temporary discriminator 10, to the second input of which pulses are applied output unit 2 forming the control interval. The reference interval is impelled from the output of the imaging unit 9 of the measured time interval. If the pulse duration at the output of the imaging unit 9 of the measured time interval is not equal to the impulse duration at the output of the control interval formation unit 2, the time discriminator 10 generates a voltage of the corresponding polarity, which is fed to the input of the generator 3 counting pulses and adjusts its frequency in this way so that

the duration of these pulses became equal. From the output of the generator 3 counting pulses, the signals arrive at one of the inputs of the selector 11, to the second input of which receives implications from the output of the generator 12 (calibration time interval (Fig. 2, g)), the duration of which is chosen numerically equal to the magnitude of the sounding base.

If the duration of the NMDP is the generator's 12 calibration time interval / gauge.

is numerically equal to the sounding base /, and the time it takes for ultrasound to travel through the base It is equal to the period T of the pulse of the generator 3 counting pulses, then the number of pulses at the output of selector II (Fig. 2, ") is equal to the speed of ultrasonic vibrations

1 / f, i T caliber

From the output of the selector 11 pulses are fed to the input of the counting device with digital indicators 13, which indicates the direct value of the speed of ultrasonic vibrations.

Claims (2)

1.Avt. swith No. 317968, M. class. G 01N 29/00, 04.24.70. 2. Avt. swith No. 393670, M. kl.2 G OSH 29/04, dated 07.29.71. Cmirn