RU1807331C - Method for testing hydrophysical transducers - Google Patents

Abstract

Usage: testing various hydrophysical transducers for the effects of temperature pulsations. SUMMARY OF THE INVENTION The hydrophysical transducer under test (for example, a pressure head pressure transducer) is moved from a stream to a stream with different temperatures Ti and Ta defined from the ratios: DT / 2, DT / 2, where DT T1-Ta is the temperature difference of the flows set during testing water. Since changes in the temperature of the diesel fuel in this case do not lead to changes in the density of the medium; it is possible to determine in pure form the temperature errors of the pressure scale transducer. By moving the same test transducer from flow to flow of the same temperature but different salinity, the response of the transducer to pressure pressure pulsations is determined. 1 s.p. f-ly, 2 ill. L ate

Description

The invention relates to technical physics and can be used to test various hydrophysical transducers for the effects of temperature pulsations.

The aim of the method is to increase the information content of the method by determining the temperature errors of contact density transducers, refractive index and pressure head.

This goal is achieved by the fact that in the known method of testing hydrophysical transducers, which consists in moving the test transducer from a laminar flow of water with a temperature of Ti to a laminar flow of water with a temperature of Ta and registering the output

converter signal at various frequencies; displacements, temperatures Ti and Ta of fluid flows in degrees Celsius are set equal to:

 DT / 2, DT / 2,

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where DT T1-Ta is the temperature difference of water flows set during testing,

In order to further expand the information possibilities, the test transducer is additionally moved from stream to stream with the same temperature but different salinity.

Fig. 1 is a diagram of an apparatus for implementing the method; figure 2 is a graph

dependences of the density of water on temperature, explaining the essence of the method.

The installation comprises a closed hydrodynamic pipe with two nozzles 2 for separating flows, refrigerators 3, a working chamber 4, in which the test transducer 5 is installed, connected to the registration unit 6 by the output.

There is also a mechanism 7. for moving the transducer 5 from a stream to a stream with different temperatures. The background temperature of the flow is kept constant by means of a heat exchanger 8. The water circulation in the installation is provided by a centrifugal pump 9, the flow rate is controlled by a direct current electric motor 10. The flow temperatures are determined using thermometers 11. The flow rates are measured by the current consumed by the pump 9 using an ammeter calibrated in units of speed (not shown in the drawing).

The method is implemented as follows. At the outlet of the nozzles 2, by means of a pump 9 and refrigerators 3, two water flows with temperatures Ti and Ta defined by formulas (1) are created in the working chamber 4.

Set, for example, the temperature difference (figure 2). Moreover, Ti 4 + 6/2 76 ° C, T2 4-6 / 2 1 ° C.

Set temperatures are monitored by thermometers 11 and begin to move the transducer 5 from flow to flow. At the same time, temperature pulsations Т that do not affect the change in the density of the liquid (the density of water at the temperatures of 1 ° C and 7 ° C is the same) and, therefore, the pressure of the pressure head, are fed to the input of the converter 5. This allows one to obtain in pure form the response of the converter to temperature pulsations of known amplitude AT (Fig. 2) and to determine the amplitude-frequency and amplitude characteristics of the converter by temperature.

Then, using the refrigerators 3, the temperature of the jets is changed, for example, to T and the operations described above are repeated. With this, the same characteristics of the converter are determined during a single, temporary impact on the last bullets

satsi of a pressure head and pulsations of temperature (informative and noninformative parameters). By comparing the initially obtained test results with the new ones,

converter response to informative

parameter (ripple of pressure head).

This result can be obtained with

implementation of the dependent claim

inventions, i.e. by additionally moving the converter from the stream to the stream of the same temperature, but of different salinity. Changes in salinity lead to changes in fluid density,

as a result, at the input of the converter, a signal is not detected by fluctuations in temperature ...

twenty

Claims (2)

1. A method of testing hydrophysical transducers, comprising moving the test transducer from a laminar flow with a temperature of Ti to laminar flow with temperature Ta and registration of the output signal of the density transducer at various displacement frequencies, characterized in that, in order to increase the information content of the method, by simultaneously determining the temperature errors of the contact density transducers, the refractive index and the pressure head, temperature Ti and Jz laminar fluid flows are set equal to: Ti (4 + DT / 2), ° C; 40 T2 (4-AT / 2) ° C, where AT Ti-Ta is the temperature difference of the laminar fluid flows that is set during testing. 2. The method according to claim 1, characterized in that the transducer under test is additionally moved from one laminar stream to another stream of the same temperature but different salinity.  / /; A2 // Y - / 7 5 Editor Compiled by Y. Vlasov. Tehred M. Morgenthal Corrector E. Papp  7th W G J57 g.