RU2303243C1 - Ultrasound level meter - Google Patents

Abstract

FIELD: the invention refers to technical acoustics and may be used for control of the level of liquid in closed reservoirs.

SUBSTANCE: the device has a receiving-radiating block located on the cover of the reservoir with investigated liquid on its inner side and a an impulse generator attached to it. The receiving-radiating block has a radiating and receiving electrical-acoustic converters and a stepping motor. The invention is directed on increasing of accuracy of measuring and on reliability of the arrangement with simultaneous provision of simplicity of construction. No-contact at measuring and high accuracy of control of the level of liquid mediums is achieved due to using ultrasound level meters.

EFFECT: increases accuracy of measuring.

1 dwg

Description

The invention relates to ultrasonic measuring equipment and can be used to measure the level of liquid media in closed tanks.

The most effective for continuous remote monitoring of the liquid level are ultrasonic level gauges.

A device for measuring the level of liquid media, which is based on measuring the absorption time of ultrasonic vibrations. In a closed tank, a device is used to control the liquid level by attenuation of ultrasonic waves propagating in the wall of the tank with the test liquid, containing a transmitter and receiver mounted on the outer surface of the tank, a generator, an amplitude detector, an amplifier, a multivibrator, a relay stage [USSR Author's Certificate No. 343155 , M. cl. G01F 23/28, 06/22/1972].

The disadvantages of this method include the influence of the temperature of the liquid in the tank on the amplitude of the signal received by the receiver, which increases the measurement error.

The closest in technical essence and the achieved result, the claimed one is an ultrasonic level gauge based on measuring the transit time of an acoustic ultrasonic pulse through a sound pipe installed vertically inside the container, from the emitter located inside the float floating on the liquid surface to the receiver [Patent of the Russian Federation No. 2156962, M class G01F 23/296, G01F 23/68, 09/27/2000].

A disadvantage of the known level gauge is that this device does not provide simultaneous contactless level control and satisfactory accuracy.

The objective of the invention is to provide a fairly simple in design, accurate and reliable instrument for measuring the level of liquid media in closed tanks.

This object is achieved in that in an ultrasonic level meter containing a pulse generator, emitting and receiving electro-acoustic transducers, in contrast to the prototype, the radiating and receiving transducers are placed in the receiving-emitting unit located on the inside of the lid of the tank with a controlled fluid, while the emitter is installed under angle, different from the direct, with the ability to adjust the angle by applying an electric pulse to the stepper motor, which is connected to the emitter and located n in the receiving and emitting unit.

The structural diagram of the proposed ultrasonic level gauge is presented in the drawing.

The ultrasonic level gauge comprises a receiving-emitting unit 2 located on the inner side of the tank lid 1, consisting of a radiating and receiving electro-acoustic transducers 3 and 4 and a stepper motor 5, and a pulse generator 6 connected to the receiving-emitting unit 2.

The device operates as follows.

The excitation of the emitting electro-acoustic transducer 3 is carried out by electric pulses of the generator 6. The radiating transducer 3 is located at an angle different from the direct one. Changes in the angle of the position of the emitter 3 are regulated by the supply of electric pulses to the stepper motor 5 connected to the emitting transducer 3. The resulting longitudinal ultrasonic wave propagating at an angle given by the position of the emitter enters the side wall of the reservoir with the liquid under investigation 1, after which it reaches the boundary air-liquid section. From the interface between media with different wave impedance, an ultrasonic pulse is reflected and falls on the side wall of the tank with liquid 1. Ultrasonic vibrations reflected from the wall of the tank 1, which carry information about the controlled level of the liquid medium, are received by the receiving electro-acoustic transducer 4, which converts the received ultrasonic pulse into an electric pulse signal.

Thus, the proposed level gauge allows you to provide high accuracy and reliability of the device and thereby solve the problem. High reliability of the device is achieved: the lack of mechanical and electrical connection between the liquid and the proposed device; the use of piezoelectric transducers as an emitter and receiver of an ultrasonic pulse. The increase in accuracy is due to the increase in the ultrasound transit time from the emitter to the receiver due to the reflection of the ultrasonic pulse from the walls of the reservoir with the liquid, the level of which is controlled.

Claims (1)

An ultrasonic level gauge containing a pulse generator, emitting and receiving electro-acoustic transducers, characterized in that the emitting and receiving transducers are placed in the receiving-emitting unit located on the inner side of the lid of the tank with a controlled liquid, while the emitter is installed at an angle different from the direct the ability to adjust the angle by applying an electric pulse to the stepper motor, which is connected to the emitter and located in the receiving-emitting unit.