SU743168A1 - Ultrasonic delay line - Google Patents

Description

The invention relates to electronics and can be used in devices for delaying electrical signals.

Known stone pine delay comprising turbo belt, rolled up into spin ral ^5, transducer interturn intermediate sing and the housing, wherein the turbo wound into a spiral, is attached by dielectric holders sing intermediate is in the form of absorbent pads disposed on the narrow sides of the acoustic duct tape [ 1].

The disadvantage of such a delay line ₁₅ is the complexity of the process of applying an absorbent coating to the narrow sides of the sound duct and the need to protect it from falling onto the working part of the sound duct. During the duration _{of 20} Nogo storage and operation device absorbent material being destroyed, which reduces the reliability and quality of the delay line.

An ultrasonic delay line is known, comprising a housing and a sound pipe placed in it, coiled into a spiral, and piezoelectric transducers attached to the ends of the sound pipe [2 ^]. The sound pipe was fixed in this delay line by means of buggers at its edges.

The disadvantage of this delay line is the presence of false signals associated with the presence of buggers, which are mechanical heterogeneities.

The purpose of the invention is the reduction of false signals of the ultrasonic delay line.

This is achieved by the fact that in the ultrasonic delay line containing the casing and the sound duct placed in it, rolled into a spiral, and piezoelectric transducers attached to the ends of the sound duct, a pad of soft-elastic material is placed between the casing and the narrow edge of the sound duct.

743166

The drawing shows the proposed ultrasonic delay line (with a partial cut-out of its body), general view.

The ultrasonic delay line contains a spiral sound pipe 1, a gasket 2 and a housing 3. The gasket 2 is made of soft elastic material, for example rubber. When assembling, the sound duct is fixed by pressing in with a small effort into the gasket. An electrical signal is applied to the input of the delay line, which is transformed by a piezoelectric transducer (not shown in the drawing) into elastic strains.

After passing through the sound pipe 1, the elastic deformations are transformed by the output piezoelectric transducer into an electrical signal, delayed by the passage of the elastic wave through the sound pipe. The appearance of false signals is due to the structure of the sound duct material and the reflections of the signals from the faces. The rubber gasket 2, touching only the narrow edge of the sound pipe 1, reduces the level of false signals experimentally.

The proposed delay line has a .'a low level of false signals, 1.5 times lower than other delay lines, is simple in design and has high reliability.

Claims (2)

This invention relates to radio electronics and can be used in electrical signal delay devices. Known pini delays, containing a tape duct rolled into a spiral, a transducer, an interturn intermediate layer, and a housing in which the duct wound into a spiral is fixed with dielectric holders, the intermediate layer is made in the form of absorbing pads located on the narrow sides of the duct ij. The disadvantage of such a delay line is the complexity of the process of deposition of the absorbing coating on the narrow sides of the suction line and the need to protect it from hitting the working part of the sump. During the long-term storage and operation of the device, the absorbent material is subject to destruction, which reduces the reliability and quality parameters of the delay line. An ultrasonic delay line is known, comprising a housing and an avi-conductor coiled in it, and piezoelectric transducers attached to the ends of the опровода 2 duct. 2. The опровода ow is fixed in this delay line using puklevki at its edges. The disadvantage of this delay line is the presence of spurious signals associated with the presence of pebbles, which are mechanical inhomogeneities. The purpose of the invention is to reduce the level of spurious signals of an ultrasonic delay line. This is achieved by the fact that in an ultrasonic delay line comprising a case and a conduit coiled in it, and piezoelectric transducers attached to the ends of the conductor, a pad of soft-elastic material is placed between the case and the narrow face of the conductor. The drawing shows the proposed ultrasonic delay line (with a partial cut-out of its body), a general view of the Ultrasonic delay line contains a spiral sound pipe 1, a gasket 2 and the body 3. The gasket 2 is made of an elastic material, for example, rubber. With a low effort and a gasket. An electrical signal is applied to the input of the delay line, which is transformed by a piezo transducer (not shown in the drawing) into elastic deformations. Passing through the conduit 1, the elastic deformations are transformed by the output piezoelectric transducer into an electrical signal delayed by the time of the passage of the elastic wave through the conduit. The appearance of spurious signals is due to the structure of the material of the chute and reflections of signals from the edges. The rubber gasket 2, touching only the narrow face of the sound duct 1, reduces the level of spurious signals experimentally. The proposed delay line has a low level of false signals, 1.5 times less than other delay lines, is simple in design and has high reliability. The invention of the Ultrasonic Delay Line, comprising a housing and spiral ducts arranged therein, and Piezoelectric transducers attached to the ends of the ducts, is characterized in that, in order to reduce the level of spurious signals, a soft gasket is placed between the housing and the narrow edge of the acoustic duct -elastic material. Sources of information taken into account in the examination of 1, Zakhar Shchev L, L. Designing delay lines. M. Soviet Radio 1972, p. 162-163. 2. USSR author's certificate number 552668, cl. H 03 H 9 / ZO, 1974.