SU1306327A1 - Method of graduating diquid transdueers of parameters of acoustie and seismie fields - Google Patents

Abstract

This invention relates to a measurement technique. . The purpose of the invention is to reduce the calibration error. To the sensitive element 3 of the converter, additional weights 13 are sequentially attached, the converter with each new load is installed in the fluid-filled chamber 5 with increased hydrostatic pressure and setting a test signal. Attaching 3 loads of equal volume to the sensitive element, a and different bulk density, and ensuring that each load has one and the same amplitude and frequency of the input signal, causes the test signal specified, for example, by the angular harmonic oscillations KrThsepH n vertical ples-. bone, does not depend on the density of the working fluid 2 transducer and fluid. 6, fill the lice chamber 5, silt, cz О5 о с к

Description

The invention concerns the immersion technology and can be used to grind liquid measuring transducers of acoustic and seismic parameters, mainly pressure gradient, vibrational velocity and linear acceleration transducers,

The aim of the invention is to reduce the graduation error.

Pa drawing shows a diagram of the device that implements the proposed method.

A pressure gradient or acceleration transducer 1 filled with working fluid 2, with sensing elements 3 (bellows, membranes) is mounted on bracket 4 in a sealed chamber 5 filled with T1M 6 liquid, which is castor oil used for transformer oil. oil glycerin, alcohol, water, etc. The measuring axis 7 of the transducer 1 is aligned with the longitudinal axis of the camera 5. The position of the longitudinal axis of the camera 5 is horizontal. The chamber 5 is mounted on the rack 8 with the possibility of rotation around the axis O and connected, by a hinge 9, to the vibration exciter rod) O, the internal cavity of the chamber 5. is connected by a fitting 11 to a source 12 of increased hydrostatic pressure. 1 is determined by the volumetric flow rate of the working fluid 2 along the measuring axis 7, which is proportional to the pressure gradient or the oscillatory velocity of the environment or the linear acceleration of the transducer body 1.

The method is carried out as follows.

A load 13 with a bulk cavity p is connected to the sensitive element 3 of the converter. The source 12 sets in the chamber a predetermined value of applied hydrostatic pressure. Camera 5 is caused by vibration exciters. 1 O are angular harmonic oscillations (in a vertical plane with amplitude oi and a circular frequency w. Sensitive element 3 of transducer 1 is affected by a variable pressure gradient, which is equal at small values of da.

 .

where g is free acceleration

fall;

Yar iP 1 p4 of density of the corresponding working fluid 2, fluid 6 and sensitive element 3;

6 is the longitudinal length of the transducer 1; t, t, is the mass, respectively, of the sensing element 3 and the load 13 with bulk density; PJ - effective area of the sensitive element 3; t - time

Record the output signal 1) of the converter 1. Set an excessive hydrostatic pressure equal to yul. A load 13 of bulk density j, is attached to the sensitive element 3, the volume Vjj of the load with the density p is equal to the volume V, the load with the density f. The given value of the increased hydrostatic pressure is set. The chamber 5 is given angular harmonic oscillations with similar amplitude and frequency s. The pressure gradient acting on the transducer 1 is equal to

ufy. 84 (Rrzh-) n HllaZ. n- E1% 1: s. sinu, t. fa

where the mass of the load is 13 bulk density PJ,

Register the output signal Uj Converter 1.

The differential pressure amplitude difference is determined.

. , P, .lr, -.p ,, (w, (2)

fi

V,;

. EL

2

(3) V,, and

the volumes V and V are equal and do not depend on the hydrostatic pressure, then,.

rp; "G" / rtf fp, -fx) n

dr and dI (ha - t.). RE -. t

(four)

3 30632

From equation (4) it follows that the test signal does not depend on the densities of liquids 2 and 6.

The amplitude difference of the sampling signal is determined.

whether.

and

"2" 1

(five)

Find transform coefficient of transducer 1 at frequency

20

By varying the frequency σ of the angular oscillations of the chamber 5 and the value of the hydrostatic pressure, determine the dynamic characteristics of the transducer 1 and the influence of the hydrostatic pressure on them.

The connection to the sensitive element 3 of the liquid converter 1 of loads I3 of equal volume and different bulk density and setting the input signal with the same parameters for each load and w reduces the graduation error due to the fact that the test signal P set does not depend on the density of working fluid 2 of the converter 1 and fluid 6 filling chamber 5 and, therefore, release 30

25

7 i

The need for determining the values of these densities at different hydrostatic pressures, the test signal and Г is proportional to the mass difference of the loads 13, the values of which are determined before testing with the necessary accuracy.

Claims (2)

W Formula of invention 20 f5 -thirty 25 1, a method for calibrating fluid transducers of acoustic-seismic fields, which means that the transducer is installed in a chamber filled with liquid, and repeatedly set a test signal, different from that, 4TOf, in order to increase the calibration accuracy, each setting the test signal of the repeater UT (attachment to the sensitive element of the converter the loads of equal volume of different bulk density, 2. The method according to p, 1, o t l and h a y and with the fact that the test set the angular harmonics of camera oscillations in a vertical plane to the keys. Editor A, Ber Compiled by T, Makaroaa Tehred M. Khodanych. Proofreader L. Zimokosov Order 4053Subscription VNISHI State Committee of the USSR for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, U / kgorod, st. Design, And