SU732737A2 - Device for measuring speed of ultrasonic waves - Google Patents

Description

one

The invention relates to ultrasound technology and can be used in the development of devices for automatic output quality control of finished products.

According to the main author. St. N 5328О7 a device is known comprising a probe pulse generator connected to the synchronizer output and an emitter, a receiver, an amplifier connected to a trigger, an additional emitter and receiver, a mechanical device, pairwise coupling a receiver and an additional receiver, an emitter and an additional emitter, switch to the inputs the receiver and the additional receiver are connected, and the WY stroke is connected to the amplifier input, a conversion unit connected to the trigger and connected in series with the divider, b the multiplication unit and the digital measurement unit connected to the automation unit connecting the synchronizer with the trigger and the switch.

The disadvantage of the device is the impossibility of organizing automatic control. This fact arises because of the separation of the operation on measuring the speed of ultrasound and the operation of comparing the result obtained with the data of the calibration dependence performed manually. In this case, the probability of a subjective approach during the control is not excluded.

ten

The aim of the invention is to provide automatic quality control of products, improving the reliability of control and the efficiency of the device used.

15

This is achieved by those. that the device is additionally introduced in series with a block of reference values, a comparing device, an analyzer and a display unit, the comparing device being connected to a digital meter and an automation unit.

The drawing shows a diagram of the device.

The device consists of radiator 1, receiver 2, mechanical device 3, additional radiator 4, additional receiver 5, automatic unit 6, synchronizer 7, trigger 8, digital measurement locator 9, switch 10, amplifier 11, probe pulse generator 12, unit converting 13, divider of values 14, multiplication unit 15, block of reference values 16, comparing device 17, analyzer 18 and display unit 19.

A device for measuring the speed of ultrasound works as follows.

Before carrying out the measurements, the block of reference values 16 is rearranged to the value of the ultrasound velocity, which corresponds to the satisfactory quality of the tested product according to the calibration dependence.

The emitter 1 and the receiver 2 are mounted on the test item. Mechanical device 3 exposes an additional pair of transducers 4 and 5 so that their radiating surfaces are outside the limits of the sample. When the device is turned on, the automation unit 6 sets the synchronizer 7 and the trigger 8 to the initial state, generates a reset signal for O acting on block 9, and sends a control signal from the auxiliary receiver to the input of the remote control 11.

The ultrasound velocity value is measured as follows. The synchronizer starts the probe pulse generator 12, which excites both emitters, and simultaneously triggers the trigger. The signal from the additional radiator travels a distance equal to the size of the test sample through the air, and the signal excited by the radiator travels the same path through the material of the product. Through the switch from the additional receiver to the input of the amplifier, a signal re-tilts the trigger. Thus, at the trigger output, we obtain an impulse, the duration of which is equal to the time of passage through the air by distance of ultrasonic vibrations equal to the sample size. This pulse by the leading edge triggers the nf) eo block of 13 time intervals per voltage. At the output of the converter, we obtain a voltage whose value is proportional to the duration of the current

impulse. When the synchronizer re-signals, the probe pulse generator is restarted, the device switch provides the connection of the receiver to the amplifier input, and a second pulse is generated at the trigger output, the duration of which is equal to the ultrasound passage time in the sample material. The conversion unit forms the second voltage, whose cycle corresponds to the duration of the second time interval. From the output of the conversion unit, both of these voltages are fed to the input of an analog divider of value 14. After the division operation is performed, multiplication unit 15 produces an analog multiplication of the result by a constant value. The device’s digital meter measures the calculated magnitude of the speed and displays it in digital form. The automation unit generates the indication time of the measurement results.

At the same time, the automation unit generates a signal, which enters the input of the comparison device 17 and allows automatic operation of the comparison of the result obtained with the reference value. The analyzer 18 determines the sign of the obtained value, and the display unit 19 records the quality in a convenient form, for example, by highlighting the corresponding board - Fit, Not fit, etc. Moreover, the quality indicator of the controlled product can be placed directly in the control zone, for example In addition to the unit, converters.

A device for measuring the speed of ultrasound provides automatic quality control of products with a direct indication of the result in the form of a qualitative assessment. Thus, an intermediate operation to determine the validity of the product, which is manually performed on the calibration curve, is excluded. As a result ; measurement times are improved, the control data is more reliable.

F

formula of the invention.

Device for measuring the speed of ultrasound by aut. St. N 532807, characterized in that, in order to provide automatic control, 5732737

the role of product quality, upgrading, comparing the device,

fidelity of the control and efficiency of the device, it is additionally equipped with a series of connected

a display device and a display unit, the comparison device being connected to a digital meter at the node

1 is

Claims (1)

Claim A device for measuring ultrasound speed according to ed. St. No. 5 32807, characterized in that, in order to ensure automatic control of product quality, increase the reliability of control and device efficiency, it is additionally equipped with a series of reference units, a comparator, an analyzer and an indication unit, and the comparator is connected to a digital meter and automatic knots