RU37227U1 - ACOUSTIC CONTROL DEVICE - Google Patents

Description

The present invention is intended primarily for remote monitoring of electrical equipment, as well as for use in measuring and testing equipment.

A known acoustic device used in industry to determine the place of leakage of air or gas UD-8 (developed in Nizhny Novgorod), containing a housing, an antenna coupled to it, made in the form of a horn, an ultrasonic vibration sensor. This device provides leakage control only in the place of its immediate location and its disadvantages include the lack of control over the object during operation at a distance of about 25-30 meters from the studied object.

When protecting electrical equipment, when high-voltage insulators are used, which are a string of insulators longer than a meter in length and it is necessary to determine the current leakage, a need arises for a device that accurately determines the specific link in the string of insulators in which current leakage occurs.

Using the phenomena that current leakage is accompanied by corona discharge and acoustic noise, and gas leakage in high-pressure systems is also accompanied by acoustic noise, it was possible to create a device for monitoring both electrical equipment and high-pressure systems during repair and test work.

The basis of the creation of the present invention was the task of expanding the operational capabilities of control devices and improving the accuracy of localization of the acoustic signal source during remote monitoring.

The problem is solved by the fact that the acoustic control device contains; its receiving antenna, made in the form of a horn, the ultrasonic vibration sensor, according to the invention, contains a sight of the optical system, while the ultrasonic vibration sensor, made in the form of a cylinder with a through axial hole, is located inside the horn moreover, the longitudinal axis of the piezoceramic cylinder is combined with the bisector of the antenna radiation pattern and the optical axis of the sight.

In FIG. shows a diagram of the proposed device acoustic control.

In the center of the antenna (horn) 1 is placed a sensor 2 of ultrasonic vibrations, made in the form of a piezoceramic cylinder with a through axial hole.

wherein the longitudinal axis of the piezoceramic cylinder

combined with the bisector of the radiation pattern of the antenna I and the optical axis of the sight (not shown), which ensures high-quality visual observation and high accuracy of localization of the location of the defect (the error in determining the location of ultrasonic radiation at a distance of 10 meters in a plane perpendicular to the axis of observation is not more than 10 cm ) An amplifier 3, an amplitude detector 4, a low-pass filter 5, and a display device b are connected in series to the output of the ultrasonic vibration sensor 2. The operation of the proposed device depends on the choice of the size of the cylinder, the choice of the size of its axial hole and the frequency range. The cylinder parameters determine the operating frequency of the device, the frequency is selected from the condition of the maximum spectral density of acoustic noise for typical control defects. At the same time, with increasing frequency, the working range decreases.

The proposed device operates as follows.

The optical sight of the device is directed towards the object being examined (not shown). Slowly scanning, by moving the device, determine the location of the malfunction, i.e. the presence of acoustic noise. The source of ultrasonic signals, operating in a passive mode, from the moment noise is detected, begins to work with the maximum signal level. In this case, the electric signal from the sensor 2 of ultrasonic vibrations enters the amplifier 3, where

3

sensitivity adjustment is possible. From the output of amplifier 3, the signal is fed to an amplitude detector 4, which selects the envelope of the high-frequency signal supplied to the low-pass filter 5, the output of which the low-frequency signal is supplied to the indication device 6.

The implementation of the ultrasonic vibration sensor in the form of a cylinder with a through axial hole, as well as combining the axis of the ultrasonic sensor 2 with the bisector of the radiation pattern of the antenna 1 and the optical axis of the sight, provides higher selectivity and gain and automatically combines the source of the detected signal with the aiming axis.

Claims (1)

An ultrasonic control device comprising a receiving antenna with an ultrasonic vibration sensor made in the form of a horn, the ultrasonic vibration sensor being located inside the horn along its geometric axis, a sight, while an amplifier, an amplitude detector, a low-pass filter, a device are connected in series to the output of the ultrasonic vibration sensor indication, characterized in that the ultrasonic vibration sensor is made in the form of a piezoceramic cylinder with a through axial hole, and the axis of the through hole The hole of the piezoceramic cylinder is aligned with the geometric axis of the horn and the optical axis of the sight.