SU1659728A1 - Device for measuring the volume of a vessel - Google Patents

Abstract

The invention relates to a measurement technique and can be used to measure the volume of a container. The purpose of the invention is to enhance the functionality by measuring the volume of narrow-mouth containers. Sources 9 of the sound excite in the acoustic paths 3, 4 sound oscillations of variable frequency. The resonant frequencies of oscillations in the measured and reference capacitances are fixed by the sound receivers according to the minimum sound pressure in the chambers 7 The volume of the capacitance is calculated by the measuring system 5 1 or

Description

The invention relates to measuring equipment, namely to measuring the volume of a container, and can be most effectively used to determine the internal volume of automobile gas cylinders,

The purpose of the invention is to increase the efficiency of the device by providing the ability to measure the volume of containers with a narrow neck.

The drawing shows a diagram of a device for measuring the internal volume of the tank.

A device for measuring the internal volume of a container contains a reference capacitance .1, a measured capacitance 2. acoustic paths 3 and 4 connected to capacitances 1 and 2, and an electrical measuring system 5. Acoustic paths 3 and 4 are each made in the form of two chambers 6 and 7, interconnected by a sound pipe 8, with this, a sound emitter 9 is installed in the chamber 6, and a sound pressure receiver 10 is installed in the chamber 7. Sound pipe 8 is equipped with a coupler 11, providing acoustic contact with containers.

The device operates as follows.

The measured capacitance 2 is connected to the acoustic path 4. The emitters 9 are turned on to excite sound vibrations in the capacities 1 and 2. Sound vibrations are perceived by the receivers 10 and converted into an electrical signal recorded by the electrical measuring system 5.

Each path together with the capacitance is an acoustic oscillating system with lumped parameters, providing excitation with the aid of emitters of acoustic oscillations of various frequencies in the system and recording the resonance condition in the capacitance using a receiver.

The sound pressure at a certain frequency in the receiving chamber is determined by the acoustic impedance of the chamber, which has an elastic character, and the acoustic conductivity of the inlet of the capacitance. Due to the resonant properties of the capacitance, due to the elasticity of the air in it and the inertial mass of air in the neck of the capacitance, the conductivity of the hole will be maximum at the resonant frequency and will have a shunting effect on the receiving chamber. This property is used to detect resonance conditions. When tuned to resonance, the sound pressure in the receiving chamber will be minimal. This minimum is used in the electrical measuring system to search and measure the resonant frequency of the capacitance. With a fixed size of the inlet of the capacitance (coupler), its resonant frequency f depends on the internal volume, which allows you to calculate the volume using the formula:

where C is the speed of sound in air:

S is the cross-sectional area of the inlet of the cylinder;

! - reduced hole length;

V is the internal volume of the tank.

Capacities 1 and 2 are oscillatory systems with resonant frequencies f _o and f ISM, and chambers 6 and 7 play the role of elasticity. When tuning sound vibrations to the frequencies f and f _M 3M, the chambers will have a minimum of sound pressure, which is a condition of resonance. Under this condition, the resonance frequencies fo and 1meas are measured in the measuring system and the volume f _M 3M of the measured capacitance is calculated by the formula where Vo is the volume of the reference capacitance;

- So and 1 ₀ - respectively the area and the reduced length of the hole of the tap of the reference capacitance:

Bism and I Izm ~, respectively, the area and the reduced length of the coupler opening of the measured capacitance.

The proposed device for measuring the internal volume of the tank in comparison with the known allows you to measure the internal volume of tanks with a narrow neck with high accuracy and performance.

Claims (1)

Claim A device for measuring the internal volume of a container, containing a reference and measured capacitance, each of which is equipped with an emitter and a sound receiver associated with an electrical measuring system, characterized in that, in order to increase the efficiency of the device by measuring the volume of the narrow-mouth tanks, tract, made in the form of two chambers interconnected by a sound guide. the corresponding emitter of sound is located in one of the chambers, in the other - the receiver, and the sound guide is communicated with the container neck.