SU1497600A1 - Apparatus for measuring electric field intensity in sea water - Google Patents

Abstract

This invention relates to electrical measuring equipment for research in the field of physical oceanology. The purpose of the invention is to increase the sensitivity and accuracy of measurements. The primary measuring transducer of the device is made dual-channel with two electrodes located outside and two electrodes located inside the dielectric body connected to a mechanical drive. The information received from the primary converter is processed in two channels, including amplifiers and multipliers, the second inputs of which are fed by the rotational speed sensor signals, the outputs of the multipliers are connected via an adder to the low-pass filter, the output voltage of which is fed to the recorder.

Description

The invention relates to physical oceanology and can be used to measure the electrical components of the intensity of electromagnetic fields in seawater.

The aim of the invention is to increase the sensitivity and accuracy of measurements.

FIG. 1 shows a primary measuring transducer of a device for measuring the intensity of an electric field in seawater, a general view; in fig. 2 shows section A-A in FIG. one; in fig. 3 is an electrical block diagram of the proposed device.

The primary measuring transducer is made in two channels and contains (Fig. 1) a hollow dielectric body 1, made in the form of a cylinder with a height much smaller than the radius of the bases, and measuring electrodes 2 and 3. Electrodes 2 are fixed at the outside of the body opposite the centers of its base, and electrodes 3 in the form of metal disks isolated from each other — inside the case on a stationary dielectric disk 4. At the bases of the case near the side surfaces, one contact hole 5 is made. e: 5 apertures arranged in mutually orthogonal directions at distances from the pivot axis equal to the radii of internal electrodes. This design of the primary transducer eliminates the modulation of the flow resistances of the measuring electrodes.

The rotation of the housing 1 and the contact holes 5 (Fig. 1) from the mechanical

O5

about

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a drive (not shown) with frequency S2 leads to a modulation of the measured electric field strength E (t). In this case, at the output of the primary measuring converter 6 (Fig. 2), the signals will change as E (t) x X K a, sinQt for the first channel and ECt) Kq, j cosQt dp of the second channel

(Kg. And Kg- - conversion factors

primary converter by channels). The outputs of the primary converter through amplifiers 7 are connected to the inputs of multipliers 8, to the other inputs of which signals are supplied sinS2t and cos 521 from the sensor 9 signals of the incidence frequency associated with primary measuring converter 6. the inputs their output signals through the day 1mator 10 arrive at the input of the low-pass filter and then to the recorder.

When the housing and the contact holes rotate at a constant angular velocity, i.e. the frequency of C2 const modulation at the output of amplifier 7 is: Uy (t) K. Cz .E (t) sinat + n (t);

V. (1)

Uy2 (t) K ,. . E (t) cos jit + n (t),

where K, KU are the gains of the amplifiers of the corresponding channels;

n | (t), n. (t) is the noise of the primary measuring transducer and the amplifiers of the device. In multiplier 8, the signal Uu (t)

multiplied by sinfjt, and the signal Uu (t)

. 2

at cos Q t:

U ,, (t) Kg, -Ky. ECt) sin s. t + + n ,, (t) .sin "2t K. Ku. E (T-) - -., E (t). cos251t +

+ n, (t) sinJlt;

(2)

S K, -K, (t). + + n. (t) cos Sit Kg Km E (t) +

   T) T. T.

+ I Kq Ky, E (t) COS 2Qt + / ()

+ n2 (t) COS Qt.

A low-pass filter 11 with a frequency of a cutoff much smaller than S2 filters out the components of the fundamental self and doubled 2 7. frequencies and extracts the signal

UcpH. (T)

or With full channel identity (K, K, K)

, 4 (t) K.K.E (t). (4)

Claims (1)

Invention Formula The device dp of measuring the voltage of an electric field in seawater contains a primary measuring transducer in the form of a hollow dielectric body connected to a mechanical drive and located inside and outside the housing of measuring electrodes, an information processing unit and a recorder, that, in order to increase the sensitivity and accuracy of the measurements, the primary converter is made two-channel with orthogonal sensitivity centers, and amplifiers connected to the measuring electrodes, connected to the primary measuring transducer, a rotational frequency sensor, two multipliers, an adder and a low-pass filter, the outputs of the amplifiers and a rotational frequency sensor connected to the multiplier inputs, the outputs of which are connected to the recorder through an adder and low-pass filter . I to "" 5th "%: 5 :: 55th КХХХХХХХХХХХХХХХХ 2 2 figure 1 A - A 3 f Fig.Z