SU395891A1 - METHOD FOR RECORDING DISCRETE MEASURABLE GEOPHYSICAL QUANTITIES - Google Patents

Description

I

The invention is intended to reproduce the recording of the results of point-to-point geophysical measurements in a form suitable for direct input into computers.

The known methods of analog recording the results of point-by-point geophysical quantities with synchronization of the movement of the recording medium with carrier oscillation parameters do not allow obtaining information in a form suitable for direct input into the computer.

The proposed method does not have this drawback and differs from the known ones in that when recording discretely measured geophysical values, the next value of the measured value signal is subtracted from each previous value, and then the resulting difference is functionally deployed by aiprymenting the original values synchronously with the movement of the recording medium, the received signal Continuously summed with the signal to be reduced and the resulting signal modulate the non-auxiliary oscillation.

FIG. 1 The block diagram of the magnetograph that implements the proposed method is given; in fig. 2 - graphs explaining the operation of the magnetograph.

The principle of the proposed method is as follows.

2

From discretely received geophysical quantities, an electrical analogue of the following difference is formed and functionally unfolds it according to the initial argument (analogous to the depth of the distance of the observation) synchronously with the movement of the recording medium and the parameters of non-oscillation. The signal thus obtained is continuously summed up with the electrical analog of the magnitude of the value to be diminished and the resulting signal is modulated by a carrier wave, the parameters of which change synchronously with the movement of the carrier by recording. In this case, the transfer interval of the recording medium is set in accordance with the step of the argument of the initial values.

Magnetograph works as follows.

In the task block of electrical analogs of the initial values, the consecutive sizing is proportional to several (at least two) input values in the order of their arrival (measurement). As setters, multi-turn potentiometers of the type PPML with digital readout of the position of their sliders are used. The outputs of the block / are connected to block 2: vygchita; neither, at the output of which the differences of the input lines are formed in the order of their arrival (measurement). The subtraction block-in the layout was built according to the scheme of a conventional operational summing amplifier. Block 2 with the input of the sweep device 3, which is an electromechanical device that ensures that the voltage level applied to it is unfolded according to the necessary law according to the argument that corresponds to the position of its rotor. In the recorder layout, as a functional unit, the baths were used by two multi-turn potentiometers (electrically and mechanically) switched in opposite directions (thanks to the indicated connection, their movement is proton phase, and the make-up artist, if one moves B1 up, then the other at the same time moves | down) from the drive 4 of the tape drive mechanism (LM). The drive works in the start-stop mode, i.e. after moving the slider of one of the potentiometers over the entire active field (thanks to the specified connection, when the dvnzh of one potentiometer slides over the active field, the other performs a passive transition in the open state) he stops. The OcTHHOBiva deployment process is provided by a control panel 5, which for this purpose is connected to a Drive 4.

In the general case, the function of the voltage received at the output of the sweep device 3 is functional, depending on the position of the slider of the potentiometer 1, can be any.

The lily functional dependence is most easily realized, since when using linear potentiometers (PPML), it is obtained automatically and at a lower amount | The number of simultaneously entered initial values (two). The last was: the implementation in the registrar under review. In the norm of ekzeri.menta, the following scheme was also tested: a functional deployment device with a simple parabolic connection.

At the same time, it was necessary to increase the number of simultaneously entered values to three and, accordingly, to ensure the formation of two consecutive differences and, moreover, add two blocks of multiplication by 2 and 1/2.

The voltage from the output of the sweep device is fed to the summation unit 6, where it is added to the electrical counterpart of the analogue of the value to be subtracted from block 2. The output voltage of the latter is fed to the recording current generating unit 7, where it modulates the carrier wave, the parameters (of which they are synchronized with the non-displacement of the tape-borne MSSHANISM (LM) and the rotor of the sweep device 5, for which it is mechanically connected with the drive 4.

This ensures an even distribution along the length of the recording medium .31 writing

information, regardless of the speed fluctuations of 1b1, enp of the drive mechanism, including its stop, ku, caused by the start-stop mode.

The control unit 5 also switches the inputs of the subtraction unit after each recording tag, thereby simplifying the input of the initial values, since after each recording step it is enough to enter only one and the next

initial value.

The operation of the plant layout is illustrated by the graphs shown in FIG. 2, where:

a is a graph of the distribution of the initial values Xi by their argument / g (depth, distance);

b - graph of distribution of the following difference of initial values of DC; by argument / g; 0 is the result of linear unwrapping of the values of AXt by the argument mapped to

the angular position of the functional deployment rotor;

g is the result of summing the values of YES; (f) with the subtracted initial value

(e) dependence of the instantaneous values of the voltage VM (/) of the output of the block of formation of the recording with synchronous amplitude modulation (the magnetic imprint on the recording media has the same shape);

e is the dependence of the instantaneous values of the voltage V (i) at the output of the recording system — simulating and demodulating.

For the sake of mapping, the proposed method of registering all the proprietary guidelines in FIG. 2

are shown for the case of the justified arg argument of the input values and constant speeds of motion of the drive mechanism in the interval of the motion. This method of registration allows you to arbitrarily change the specified step.

argument after each recording interval and operate with varying drive speeds. In the latter case, however, it always takes place uniformly in the distribution of the dependence displayed on the record carrier.

Subject invention

The method of recording discretely measured geophysical quantities with motion synchronization

a recording carrier with a bearing gauge, characterized in that, in order to obtain a record in a form suitable for the next processing, the following value is subtracted from each previous value

the signal of the measured value, and then the amplitude of the difference signal is transformed in proportion to the change in the argument of the initial value, the resulting signal is continuously summed with the iC signal diminished and the resulting signal, modulating the carrier wave.

-Dfig. one

.xixlxl

sh

I I

V

tp