SU1613961A2 - Apparatus for measuring pulsations of speed of flow of electric conducting liquid - Google Patents

Abstract

The invention can be used in hydrophysical studies of the seas and oceans. The purpose of the invention is to increase reliability. The goal is achieved by the fact that two additional electrodes are installed symmetrically to the measuring electrodes, which are connected via a switch to the output of a sinusoidal voltage generator, and the central measuring electrode is connected via a switch to the housing. Two measuring electrodes are connected via a switch to the inputs of a two-channel amplifier with different transmission coefficients through the channels. The outputs of the amplifier are connected to the corresponding inputs of the analog divider. 2 Il.

Description

The invention relates to the measurement of motion parameters, can be used to measure the field of the pulsating velocities of the aquatic environment during hydrophysical studies of the seas and oceans, and is additional to the basic invention by the author. No. 773496.

The purpose of the invention is to increase reliability.

Figure 1 presents the scheme of the device; Fig. 2 shows the same general view and arrangement of the primary conversion electrodes.

The device contains additional electrodes 1, measuring electrodes 2, generator 3, two-channel amplifier 4, analog divider 5, measuring amplifier 6 and switch 7.

The device works as follows.

In the mode of measuring the velocity pulsations, the measuring electrodes 2 are connected to the measuring amplifier 6, the output signal of which is proportional to the pulsations of the flow velocity.

In the control mode of operation through the switch, the electrodes of the primary converter are disconnected from the inputs of the measuring amplifier 6 and connected according to the attached circuit (see Fig. 1). In this case, an additional electrodes 1 from the output of the generator 3 receives a sinusoidal signal. The frequency of the output voltage of the generator f is determined from the non-frequency.

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wed

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ven f j f o fg. Where

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The frequency and the upper frequency are the amplitude-frequency characteristic of a two-channel amplifier 4.

The voltage applied to the additional electrodes creates a variable. spectral field in the area of measurement electrodes. The signal induced on the measuring electrodes 2 is amplified by a two-channel amplifier 4, the Q-factors of which are selected in such a way that the signal at the output of the first was larger than that of the second. The voltages from the outputs of the amplifiers are fed to the corresponding 5 inputs of the analog divider 5, which performs the mathematical operation of dividing the first signal by the second.

The value of the signal at the output of the analog divider, which was established during device setup, is a criterion for the leakage resistance to match the nominal value. It remains constant with proportional changes in the voltage transferred to the measuring electrodes. a decrease in leakage resistance, which occurs if the dielectric coating of the primary Q converter is not interrupted or due to deterioration of the dielectric properties, leads to a change in the signal at the output of the analog divider 5. Periodic

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Q 5

5 Q

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The control carried out with the aid of the device proposed allows timely detection of changes in the insulation resistance, the reduction of which leads to an increase in the electrical noise of the primary measuring transducer and degrades the sensitivity of the measuring device.

Claims (1)

Invention Formula A device for measuring the pulsations of the flow rate of an electrically conductive fluid according to the author. No. 773496, characterized in that, in order to increase reliability, a switch, a sinusoidal oscillator, a two-channel divider, an analog divider and two additional electrodes installed symmetrically with respect to the extreme measuring electrodes, which are connected via a switch to the first output of the sinusoidal generator, are introduced into it the second output of which and the central measuring electrode through the extreme measuring electrodes are connected to the inputs of a two-channel amplifier, the outputs of which are connected us with analog inputs of the engine, wherein the channel gain coefficients of amplifiers selected different, Fig: 2.