RU87543U1 - ACOUSTIC RANGE DETERMINATION DEVICE - Google Patents

Abstract

The invention relates to the field of sound ranging and acoustic control and can be used to measure distances to objects moving in the pipe spaces. The invention solves the problem of creating a sound ranging device, which allows to reduce the error in measuring distances to objects moving in the tube spaces. The acoustic ranging device comprises a first acoustic range finder with a receiving-emitting acoustic sensor, a control unit and a second acoustic range finder mounted on the outside of the pipe, a control unit connected to the first and second acoustic range finders installed at different points of the pipe, and on the object being moved inside pipes installed device generating an active response. 1 ill., 1 tab.

Description

The utility model relates to the field of sound ranging and acoustic control and can be used to measure distances to objects moving in in-tube spaces.

Known devices for acoustic ranging according to the method of unidirectional measurement (A. Gorbatov, G. E. Rudashevsky. Acoustic methods for measuring distances and control. - M.: Energoizdat, 1981. - P. 19-20, Fig. 1-7, Fig. 1-8) containing an emitter of ultrasonic vibrations, a receiver of ultrasonic vibrations, a recorder that provides measurement of the distance to the object by the time of passage of ultrasonic vibrations from the emitter to the receiver.

A device for acoustic ranging is known (RF patent No. 71450, IPC (2006.01), G 01 S 15/08, published 2008.03.10), selected as a prototype, comprising an acoustic range finder with a receiving-emitting acoustic sensor mounted on the outside of the pipe, and an active response generating device containing a threshold regulator, to which a comparator, generator and emitter are connected in series, is installed at the object moving inside the pipe, while the receiver is connected to the comparator

A disadvantage of the known devices is the high error in determining the distance to the in-tube object, due to the dependence of the propagation velocity of the ultrasonic signal on temperature, pressure and the composition of the medium filling the pipeline.

The objective of the utility model is to create an acoustic range-finding device that allows to reduce the error in measuring distances to objects moving in the tube spaces.

The problem is solved due to the fact that the acoustic ranging device, as in the prototype, contains an acoustic range finder with a receiving-emitting acoustic sensor mounted on the outside of the pipe, and an active response generating device is installed on the object moved inside the pipe.

According to a utility model, the control unit and the second acoustic range finder are mounted on the outside of the pipe, the control unit being connected to the first and second acoustic range finders installed at different points of the pipe.

By using the control unit and the second acoustic range finder mounted on the outside of the pipe, the control unit being connected to the first and second acoustic range finders installed in different pipes, it is possible to determine the propagation velocity of ultrasound in the medium filling the pipe by dividing the doubled distance between the first and the second acoustic range finders on the difference of the bidirectional signal propagation time between the in-tube object and the first and second acoustic yes nomerami, and using the obtained speed values to determine the distance to the object-tube, it is possible to reduce distance measurement errors to objects moving in-tube spaces.

Figure 1 presents the structural diagram of the proposed device.

The table shows the results of measuring the removal of the in-tube object from the first acoustic range finder.

The acoustic ranging device (Fig. 1) comprises a control unit 1, a first range finder 2 installed at a first point on the outside of the pipe 3, a second range finder 4 installed at another point on the outside of the pipe 3, and an active response generating device 5 mounted on the in-pipe object 6, moved in the in-tube space.

The control unit 1 is connected to the first range finder 2 mounted on the outside of the pipe 3, and the second range finder 4 mounted on the outside of the pipe 3 at a fixed distance from the first range finder 2.

The control unit 1 can be performed on any microprocessor, for example, ATMEGA 8, rangefinders 2 and 4 must be acoustic, for example, according to RF patent No. 2315335 IPC (2006.01) G01S1 5/08, the device for generating an active response 5 can be selected from the RF patent No. 2315335 IPC (2006.01) G01S1 5/08. As an in-tube object, an in-line scraper or sealant may be selected.

First, the control unit 1 issues an enable signal to the first range finder 2, which feeds a probing signal to the in-pipe object 6, moved inside the pipe 3, and receives a response signal from the active response generating device 5 located on the in-pipe object 6. After receiving the response signal, the first range finder 2 determines the time of the bidirectional propagation of ultrasound to the in-tube object 6 and transfers it to the control unit 1. Then, the control unit 1 issues an enable signal to the second range finder 4, which feeds the probe signal to the in-tube object 6, moved inside the pipe 3, and receives a response signal from the active response generating device 5, located on the in-tube object 6. After receiving the response signal, the second range finder 4 determines the time of the bidirectional propagation of ultrasound to the in-tube object 6 and transmits it to the control unit 1. The control unit 1 calculates the propagation velocity of ultrasound in the medium filling the pipeline according to the formula:

,

where t ₁ is the time of bi-directional propagation of ultrasound from the first range finder 2 to the in-tube object 6,

t ₂ - the time of the bidirectional propagation of ultrasound from the second range finder 4 to the in-tube object 6,

L is the distance between the first 2 and second 4 rangefinders.

After that, the control unit 1 uses the calculated speed to calculate the distance to the in-pipe object.

The results of bench tests of the acoustic ranging device shown in the table show the possibility of measuring the distance with this device in various environments with high measurement accuracy. The error of distance measurement does not exceed 0.02 meters in the range from 0.5 to 3.0 meters. The error in measuring the distance of the prototype is 0.04 meters, which is two times more than the proposed method.

Acoustic ranging device

Figure 1

Table Range measured by tape measure (m) Rangefinder reading in water (m) Indication of a range finder in saline solution (m) Maximum absolute measurement error (m) Error
prototype measurements (m) 3.0 3.02 3.01 0.02 0.01 2.5 2,50 2,51 0.01 0,03 2,3 2.29 2,31 0.01 0.04 1.7 1.71 1.72 0.02 0.02 1.3 1.29 1.3 0.01 0,03 0.9 0.89 0.89 0.01 0.01 0.5 0.51 0.49 0.01 0.01

Claims (1)

An acoustic ranging device comprising an acoustic range finder mounted on the outside of the pipe, and an active response generating device is installed on the object moving inside the pipe, characterized in that the control unit and the second acoustic range finder are installed on the outside of the pipe, the control unit being connected to the first and second acoustic range finders mounted at a predetermined distance from each other.