SU1476243A1 - Leak detector - Google Patents

Abstract

The invention relates to pipeline transport and can be used to remotely detect leaks of buried pipelines. The purpose of the invention is to improve the accuracy and speed of leak detection - achieved by introducing devices that store and correct previous measurements of noise from a pipeline leak without taking repeated measurements. 1 il.

Description

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The invention relates to a measurement technique and can be used to remotely detect the leakage place of a buried pipeline of liquid and gaseous substances.

The purpose of the invention is to improve the accuracy of the speed of leak location detection by introducing means for memorizing, correcting previous measurements of noise from a pipeline leak on a display of linear indicators without repeated measurements.

The drawing shows a block diagram of a leak detector.

The leak detector consists of three main units - measuring 1, display 2 and control 3.

The composition of the measuring unit 1 includes a transducer 43 for example a piezoelectric, connected in series with the amplifier 59, the output of which is connected to a filter. 6. The output of the latter is connected through a regulating element 7, which allows changing the level of the signal under study, to the headphones 8.

The display unit 2 is a serially connected digital-to-analog converter (DAC) 9, the analog input of which is connected to the amplifier 5 of the measuring unit 1, to the input of the amplifier 10, the output of which through the detector 11 is connected to the input of the analog-digital converter (ADC) 12, and the counter 13 of measurements and scoreboard 14 linear indicators.

The control unit 3 consists of a processor 15, a memory unit 16, to an interface 17 interconnected by a system bus, consisting of data medium buses and control buses, and a key input device 18 connected to a second input of the interface. With the display unit 2, the control unit is connected via the inputs and outputs of the interface.

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The leak detector works as follows.

The location of the leakage of the damaged pipeline is determined by ear on the head phones 6 and at the same time visually on the scoreboard 14 linear indicators 14.

In the initial state, transducer 4 is installed in the area where the noise from the pipeline leak is insignificant. The amplified electrical signal through amplifier 5, filter 6 and regulator 7 is fed to headphones 8, which are used to evaluate the nature and intensity of the noise from the source of the leak.

After pressing the button of the keyboard input device 18, the analog signal through the DAC 9 operating in the voltage regulator mode, the amplifier 10 and the detector 7 is fed to the ADC, which converts the signal and digitally transmits it through the first input of the interface 7 to the processor 15.

The processor 15, under the control of a program supplied via the system bus from the memory ROM 16 through the first input of the interface 17 of the constant, changes the transfer ratio of the DAC and, accordingly, the digital signal of the ADC 12, which is compared with the number recorded in a certain memory ROM 16, the value which is full scale on the linear indicator board. As soon as the signal reading reaches full swing on this board, the DAC 9 s code is stored in the memory RCD cell. On the counter 13 measurements processor 15 through the system bus and the second input of the interface 17 displays the unit corresponding to the first measurement on the first scale.

When the second measurement is carried out after installing the converter 4 in another place of the damaged pipeline and pressing the key-in button, the processor 15 writes a new value of the DAC code 9 into the next RAM cell, which is compared with the previous value of the first measurement. If the difference of this comparison is positive, then the processor 15, having changed the first measurement DAC code by this value, under the action of the program of the memory 16 of the memory through the interface and the first output of the interface 17 sets this code to digital

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the input of the DAC 9. The analog signal at the input of the A / D converter 10 is reduced by an amount proportional to the digital code received at the digital input of the D / A converter 9, and on the first scale of the scoreboard 14 linear indicators the corrected first measurement is displayed.

If the difference is negative, the processor makes the same adjustment for the second measurement. On the first scale of the linear indie-4 display of boats, the value of the first measurement is reflected in the full scale of the scale, and the second shows a measurement proportional to the digital input code of the DAC 9.

The following measurements are made to record new values of DAC codes 9, which are recorded in the RAM cell with corresponding measurements. Then, under the action of processor 15, the same analysis of DAC codes 9 occurs, the difference between the obtained values is revealed and the previous measured values are corrected.

Thus, the linear indicators display reflects the pattern of the measurement distributions depending on the distance to the source of the leakage of the damaged pipeline, with each subsequent measurement correcting the results of the previous ones. The maximum value in relation to other measurement values is always displayed in full scale of the linear indicator display panel, which allows more full use of the indicator and more clearly display the information. Additional introduction of the processor, memory unit, interface, DAC, and measurement counter into the detector. device and key input allows you to improve performance due to the subsequent correction of measurement results, if the subsequent exceeds the previous one and the limit of the measurement scale, as well as to increase exactly The search for a pipeline leak in a visual way by maximizing the use of a linear indicator display.

Claims (1)

Invention Formula A leak detector containing a mechanical vibration converter in five an electrical signal connected via series-connected first amplifier, electric filter and regulating element to headphones, an analog-to-digital converter and a linear indicator display, which is equipped with series-connected to increase the accuracy and speed of the leak detection digital analog converter, the control input of which is connected to the output of the first amplifier, the second amplifier and the detector, whose output is not with an analog-to-digital converter input, a memory unit, an interface, a processor that, through its system bus consisting of address and control buses and a data bus, is connected to the memory unit and, the interface whose outputs are connected to the information inputs An analog converter and a linear indicator board, a measurement counter, the input of which is connected to the interface, and a keypad input device, the outputs of which and an analog-digital converter are connected to the interface.