SU502386A1 - Method for controlling the quality of filling with a liquid of a quasistatic chamber - Google Patents

Description

502386

(one)

/ .. / l-f / r {l / ,: V, S

where / С is a constant coefficient equal to the ratio of the moduli of the volume elasticity of the liquid and gas bubbles; V B - the total volume of gas bubbles in

the camera;

VL - the volume of fluid in the chamber. Typically, quasi-static chambers are filled with water and used under laboratory conditions. For this case (air-to-air, / (16 10), the table gives the values of the frequency ratio / p and / "depending on the relative content of air bubbles in the chamber, calculated from relation (1). These tables show, for example, that / p; / "0.85 volume of air bubbles is about 0.0025% of the volume of water in the chamber. This module shows that thorough degassing of water in the chamber is the main condition for the proper calibration of hydrophones in quasistatic jpax. On the other hand, data table

Claims (1)

indicate the possibility of detecting even smaller air inclusions, since the use of even standard GZ-16 or GZ-33 type generators, usually used in calibration facilities of similar designation, makes it possible to fix frequencies / p other than f, within one%. Thus, after experimentally determining the frequency of the ", upon subsequent calibrations of the hydrophones, it is sufficient using the receiving-emitting path of the calibration facility to determine the resonant frequency / p of the chamber with an open auxiliary hole in order to make a clear judgment about the quality of filling of the 1st chamber with liquid. If the frequency / p is close to the frequency fH, the auxiliary hole is closed and the calibration of the test hydrophone is started. If the frequency / p turns out to be significantly lower than the frequency / „, then take measures to remove gas bubbles. Claims The method of controlling the quality of filling a quasistatic chamber with liquid using a receiving-emitting path, characterized in that, in order to speed up and simplify monitoring the quality of filling of the chamber with liquid, the cavity of the chamber is communicated with the atmosphere, then the resonant frequency of the chamber is measured with a receiver-receiving path and by comparing its value with the value of the experimentally determined resonant frequency of the chamber without gas bubbles, determine the quality of filling the chamber with liquid.