SU759860A1 - Acoustic frequency sensor - Google Patents

Description

The invention relates to measuring equipment and can be used to measure force and mass.

Known acoustic frequency. with a sensor containing a sealed chamber divided by a partition into two cavities, vibration sensors associated with acoustic channels made in the wall of the chamber and the measuring system [1].

The disadvantage of this device is not wide enough functionality due to design flaws. ,

The purpose of the invention is the expansion of functionality.

This is achieved by the fact that the wall of one of the cavities, opposite to the wall with acoustic channels, is made in the form of an elastic surface with a rigid center.

The drawing shows schematically an acoustic frequency sensor containing a hermetic chamber 1 divided by a partition 2 into two cavities. The vibration sensor 3-6 is connected with acoustic channels 7, made in the wall of chamber 1, and included in the measuring system, which has usi-30

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Lines 8, 9 with differential frequency meter 10 at the output. The wall 11 of one of the cavities opposite to the wall 12 'with acoustic channels _7 is made in the form of an elastic surface with a hard center.

Acoustic frequency sensor works as follows. '

In the initial state, the force does not affect the elastic surface with a rigid center. When the power is turned on, the microphones of the vibration sensors 3, 5 emit acoustic waves, which, being reflected, arrive at the microphones of the vibration sensors 4, 6, which convert the acoustic oscillations into an electrical signal. In the cavities of the chamber 1, formed with the help of the partition 2, stable acoustic oscillations with equal frequencies are established and the measuring system registers the zero signal.

When a force acts on the wall 11 with a rigid center, it bends due to Hyogo changing the volume of the cavity and the distance between the walls 11 and 12 and, consequently, the frequency of acoustic oscillations. The measurement system captures the differential frequency.

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. by which the magnitude of pressure, force or mass is judged.

Claims (1)

Claim Acoustic frequency sensor containing a sealed chamber divided by a partition and two cavities, vibration sensors: associated with acoustic channels made in the wall of the chamber and the measuring system, about the same because, in order to extend the functionality, the wall of one of the cavities, opposite to the wall with acoustic channels, it is made in the form of an elastic surface with a rigid center "*.