CS269046B1 - The ultrasonic probe detects the liquid in the pipe and in the containers - Google Patents

Abstract

The essence of the device lies in the fact that the probe consists of prismatic piezoelectric elements arranged in a row next to each other, which are mounted on a flexible base.

Description

The invention relates to an ultrasonic probe solution, particularly for indicating liquids in pipes and tanks.

Previously known ultrasonic probes for checking the presence of liquids in pipes and tanks with a flat active surface are acoustically contacted with a ground flat surface on the pipe. Ultrasonic probes are also known whose active surface is curved and is identical to the curvature of the pipe. The disadvantage of the first solution is the laboriousness of manufacturing the 8 connector and in the second solution, the probe 8 must be manufactured with the appropriate curvature for each pipe diameter.

The above-mentioned disadvantages are eliminated and the technical problem is solved by an ultrasonic probe, especially for indicating liquids in pipes and in tanks, according to the invention, the essence of which is that it is formed by prismatic piezoelectric elements arranged in a row! between which gaps are formed. The active part of the piezoelectric elements is provided with a flexible base. The prismatic piezoelectric elements are cast with a flexible substance on the flexible base.

Ultrasonic probes, especially for indicating liquids in pipes and tanks, eliminate the need to make a surface on the pipe or tank for mounting the probe. The flexibility of the probe allows it to be mounted on pipes with a wide range of diameters. At the same time, the ultrasonic wave is focused and thus the echo from the opposite pipe wall is increased.

The attached drawing shows an exemplary solution of an ultrasonic probe according to the invention, where Fig. 1 shows it in cross-section connected to a pipe and Fig. 2 shows detail A from Fig. 1 in axonometric view.

The ultrasonic probe for indicating liquids in pipes consists of prismatic piezoelements 1 acoustically connected by gluing to a flexible substrate 3. Gaps 2 are formed between the prismatic piezoelements 1 and they are electrically connected to a cable 5. The prismatic piezoelements 1 are connected to the flexible substrate 3 in one unit by a flexible material 4, for example lukoprene.

The function of the ultrasonic probe for indicating liquids in the pipeline is as follows: The ultrasonic probe is applied to the pipeline 6 with a flexible pad 3 and is fixed to it by means of a clip 7. An electric impulse supplied by a cable 5 to the prismatic piezoelectric elements 1 causes a slight deflection of the front surface due to the piezoelectric effect. As a result, the prismatic piezoelectric elements 1 oscillate at their own mechanical thickness resonance frequency! and excite an ultrasonic wave propagating through the flexible pad 3 into the environment. The flexible pad 3, in addition to protecting the prismatic piezoelectric elements 1 from damage and giving the probe the necessary shape, simultaneously adapts the acoustic impedance of the prismatic piezoelectric elements 1 to the environment, for example the pipe wall, thereby enabling maximum transmission of ultrasonic energy. The echo reflected from the obstacle reaches the prismatic piezo elements 1 in the same way, which convert the mechanical energy into an electrical signal conducted by cable 5 to electronic evaluation circuits (not shown).

269 046 Bl

The ultrasonic probe according to the invention is advantageously used, for example, for indicating the presence of liquid in the pipe 6, so that in the case of the presence of liquid, the ultrasonic pulse propagates to the opposite wall of the pipe 6 and after reflection, the echo returns to the probe with a delay given by the diameter of the pipe 6 and the speed of ultrasound propagation in the environment. The electrical signal obtained on the prismatic piezoelectric elements 1 is evaluated in electronic evaluation circuits. In the case that there is no liquid in the pipe 6, the ultrasonic pulse practically does not reach the opposite wall of the pipe 6 and the electronic evaluation circuits determine its absence and therefore the absence of liquid in the pipe 6.

The flexibility of the ultrasonic probe allows it to be used in pipes or vessels of a wide range of diameters without the need for special surface treatment and a better signal-to-noise ratio due to the reflected echo, thus allowing more reliable signal evaluation.

Claims (1)

Ultrasonic Probe According to the Invention It is advantageous, for example, to praindicate the presence of a liquid in line 6 so that, in the case of the presence of a liquid, the ultrasonic pulse sweeps on the opposite wall of the conduit 6 and the echo returns to the probe with a delayed given dimension of conduit 6a. ultrasound in the environment. The electrical signal obtained by the prismatic piezoelements 1 is evaluated in the electronic evaluation circuits. If there is no liquid in the pipe 6, the ultrasonic pulse practically inadequate on the opposite wall of the pipe 6 and the electronic evaluation circuitry is found to be absent and the absence of liquid in the Pipe 6. The flexibility of the ultrasonic probe allows it to be used on pipes or vessels of a wide range of diameters without the need for a special surface finish and a beacon signal to noise bouncing echo and thereby reliably evaluating the signal. THE SUBJECT MATERIAL The ultrasonic probe, particularly for the indication of liquid in the pipe and in the reservoir, is formed by a row of arranged piezoelements (1) between which the maders (2) are formed, the active part of the piezoelements (1) being provided with a spring washer (3), while the prismatic piezoelements (1) are molded onto the resilient washer (3) with a resilient mass (4). 1 drawing