SU1247784A1 - Input device for registering electrostatic field in atmosphere - Google Patents

Description

The sensors are located at the ends of two electric rods fixed in their middle at different levels perpendicular to the vertical axis and one to another. The basis of the operation of the device is the selection of the variable composition of the Ivy voltage of the first sensor 3,

one

The invention relates to a measurement technique, namely, devices for direct measurement of an electrostatic field in a plasma in a high atmospheric layer of the earth and its parameters using a dynamic measurement method or a double probe method.

The device is installed on the aircraft with the transfer of it. output signals via tele-channels (metrics, their recording and processing.

The aim of the invention is to improve the accuracy of registration.

Figure 1 shows the block diagram of the device; FIG. 2 shows the time diagrams explaining his work.

The device (Fig. 1) contains sensors 1-4, preamplifiers 5, 6, 7, adders 8, 9, 10, a control attenuator 11, a high-resistance resistor 12.

At the same time, the first and second sensors 3 4 are connected through the preamplifiers with the first one to the non-inverting one, the second one to the inverting inputs of the first adder 9 and, in addition, to the two inverting inputs of the second corresponding to each sensor. Adder 8. The third sensor 2 is connected through a pre-amplifier 6 to the non-inverting input of the second adder 8. The third adder 10 through the automatic attenuator 11 is connected to the output of the second adder 8 by its second input, to the third input to the second input. The third adder 10 is connected to the output of the first adder 9. The output of the third adder 10 through a high-resistance resistor 12 is connected to the first sensor. When this outputs adders 8, 9, output

its subsequent summation with a voltage equal to the whole or part of the DC voltage due to the vertical component of the field carried out by the third adder 10 and fed to the resistor 12. 2 Il.

automatic attenuator 11 and preamplifier 6 are outputs of the entire device.

The device works as follows.

The basis of operation of the device is the selection of the variable component of the voltage of the first sensor 3 and its subsequent summation with a voltage equal to the whole or part of the direct voltage due to the vertical component of the field carried out by the third adder 10 and supplied to the resistor 12.

Owing to the rotation of the sensors around the axis of symmetry of the crystal, carried out in the electric field of the atmosphere, the sensors are applied to the alternating voltage shown in Fig. 2a for the third sensor 2 and measured relative to the fourth sensor 1. At the same time, the amplitude oscillates. The scientific research institute of a sinusoid is defined by expression

and

EL,

(one)

where Ep is the strength of the floor in the horizontal plane; 2 - distance between sensors

1 and 2.

The frequency of the sinusoid (Fig. 2, a) is equal to the frequency of rotation of the shaft and is infra-low, on the order of ten or even hundredths of a hertz.

At the output of the first adder 9, the voltage between the sensors 3, is obtained. 4, shown in FIG. 2, b. This voltage is shifted by 90 relative to that shown in FIG. 2, while preserving the remaining parameters of the sinusoid of FIG. 2, a. The reason for this is that the bar connecting the date

Tips 1 and 2 are perpendicular to the rod connecting sensors 3 and 4. Both voltages (Figures 2, a, b) determine by their amplitude the strength of the horizontal component of the creep in accordance with the extrusion (1).

Considering the electrical circuit, composed of a quarter-meter sensor 1, the middle of the sensor bar 1 and 2, the middle of the rod-sensor 3 and 4, the first sensor 3, and based on Kirchhoff's law, you can write the voltage for the first sensor 3 relative to the fourth sensor 1

Ui, 3 I and „+ and,

; 2

  Us,

de and Uai and the voltage shown in Fig. 2, a and equal to the output voltage of the third preamplifier 6 UDZ;

the voltage determined by the vertical component of E. the vector of

the field and defined by formula (1) when Ef- is replaced by E (and C by j is the distance between the bars; the voltage represented in Fig. 42b is equal to the output voltage of the first adder 9.

The flux for the second sensor 4 is recorded in the same way.

and.

 D4

 1 Up + and.

- I Us.

The minus sign in front of U is due to the fact that, with respect to the axis of symmetry, the voltage on the sensors 3, 4 varies in antiphase.

The second adder 8 generates the following amount:

and

vg

- UDJ- Ui, 4 2U (j,

those. at its output, it has twice the value of the voltage defined by the vertical component of the field vector.

Having considered the expression (2), it can be made that the voltage on

The first sensor 3 consists of the sum of the constant voltage U and the variable 2 Ua + Hj (Fig. 2c). Voltage

Uj is constant, since the rotation of the rods around the vertical axis of symmetry does not change the length of the projection of the vector field on this axis.

The third cy clock 10 (the transmission coefficient on all its inputs is +0.5), connected to the preamplifier 6 and from the mapper 9, forms the voltage

 ABOUT

t5

I Ua + 5 "

(five)

20

25

thirty

35

40

equal to the alternating voltage on the first sensor 3.

Therefore, the resistor 12 for this voltage has an infinite resistance, as it were, since the current component for this voltage is zero. A constant output voltage of the automatic attenuator 11 is added to this alternating voltage.

Under this condition of the controlled attenuator, when its transmission coefficient is equal to one, a constant is added at the output of the third adder to the variable component, and, and with this transmission coefficient of the controlled attenuator, the resistor {12 has infinite resistance, therefore the whole device performs registration components of the vector floor.

When the transfer ratio of the attenuator 11 is less than one at the output of the third adder 10, part of the constant voltage flows and current flows through the resistor 12

SW -K "and R

(6)

45

50

55

where R is the resistance of the resistor 12.

Due to the flow of this current through a medium with resistance, the voltage at the output of the second adder 8 decreases by the amount (Fig. 2, d), which serves as information for determining the properties of the medium.

With a known voltage of a vertically-to-be: The flax component obtained at the output of the second adder 8, the known voltage at the output of the attenuator, and the resistance of the resistor 12 through the medium, which causes the voltage drop across R, is unambiguously determined. These operations are performed when processing the recorded measurement results, but are necessary to obtain information about the properties of the medium, which depends on the ratio of the magnitude of the voltage drop to Rfp and the current flowing through the medium and causing such a voltage drop.

It is assumed that the transfer coefficient of the adders at the inputs is equal to one, except for the stipulated ones, as well as for preamplifiers.

Attenuator 11 in the proposed device can be implemented, for example, in the simplest case using a set of resistors connected to a fixed resistor, the second end of which is the input of the attenuator, and connected to a neutral wire using a given program using any keys. Wherein . key management can be performed using counter outputs operating in a position code and controlled by a pulse generator. The junction point of the constant resistor and the set of resistors is the output of the controlled attenuator. To ensure operation, one of the outputs of the counter is free.

Attenuator 11 can be performed on. Based on a digital-to-external converter (DAC), controlled by a counter connected to a pulse generator. In this case, the reference voltage input of the DAC is the attenuator input, and the output is the attenuator output

Claims (1)

Formula of the image  An input device for recording an electrostatic field in the atmosphere, containing four sensors located at the ends of two dielectric rods fixed in their middle at different levels perpendicular to the vertical axis and one to another, three adders and three preamplifiers, the first sensor located along with the second at the ends one dielectric rod and through the first pre-amplifier connected to the non-inverting input of the first adder and the inverting input of the second adder, the second the sensor through the second preamplifier is connected to the inverting inputs of the first and second adders, the third sensor is located along with the fourth at the ends, the other dielectric rod and through the third preamplifier is connected to the non-inverting input of the second adder and the first input of the third- GO Adder, the outputs of the first and second Adders are connected to the first and second outputs of the device, characterized in that, in order to increase registration accuracy, an automatic attenuator and a high-resistance resistor are added to it, and the output of the second adder is connected to the third output of the device and the second input of the third adder an adder, the third input of which is connected with the output of the first adder, and the output of the third adder through a high-resistance resistor is connected to the input of the first preamplifier, exit third pre the amplifier is connected to the fourth output of the device, and the fourth sensor is connected to the common bus, with respect to which the amplifiers and adders of the device are connected. Editor N.Shvydka Compiled by O. Glukharev Tehred V. Kadar Proofreader; M. Demchik Order 4119/44 Circulation 728 Subscription VNIIPI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 g fzg 2