SU873187A1 - Device for nuclear magnetic resonance signal analysis - Google Patents

Description

damping leads to significant errors in determining the initial amplitude. The purpose of the invention is to expand the functionality. The goal is achieved by analyzing nuclear magnetic resonance signals containing a series-connected resonant amplifier linear detector, to the output of which two integrators are connected, the outputs of which are connected to low-pass filters connected to the outputs of the main division, the driver correction factor, the main multiplier link, one input of which is connected to the output of one of the low-pass filters, and the output is connected to the input of the registration unit, the additional but a multiplying and dividing link, a logarithm and an anti-logarithm were introduced, while the output of the Main dividing link is connected via a logarithm to the inputs of the additional link and the delay line, the output of which is connected to the input of additional split and multiplying links, and the output of the additional multiplier link is connected with the input of the anti-logarithm connected to the output of the main multiplier link, and the output of the additional link is connected to the second input of the additional multiplier link via the driver l correction factor. . FIG. 1 shows a block diagram of the device; in fig. 2 - time diagram of the device; on phi 3 g plot of the dependence f (x) of the driver correction factor. The device contains a resonant amplifier 1, a linear detector 2, integrating links 3 and 4, low-pass filters 5 and b, the main separating link 7, the logarifmator 8, the delay link 9, the additional separating link 10, the correction factor shaper 11, the main and additional multipliers links 12 and 13, anti-log 14 block 15 registration, block 16 controls. The integrating link 3 measured the average over time t /, - ut (2 × - t values of the envelope of the signal U / a, and integrator 4, measures two average values of U, corresponding to the time intervals t / j -ut / i (2 - f + bt t (i + ut) (Fig. 2). Accordingly, the dividing link 7 calculates the ratio DO / UI and Uij / U from the values of the voltages coming from the outputs of low-pass filters 5 and 6, which function as cells For the signals described by the Weibull function, the output of the logarithm 8 during the time t + A tj, -fltg) is a voltage proportional to aa fi I ta. eL. 137 t, and after the time tj + ut3 / 2 has elapsed, a proportional voltage ((± 1 and, -U, i) is applied to the input of the dividing link of 10 s. By the link 9 is chosen equal to t а (At - flta) / 2. Due to this, the 2nd input of the split link 10 at the time tj + q tj / 2 from the output of the delay line 9 receives a voltage proportional to St Thus, at the output of the split link 10 during the time tj- t + -flta) / 2 acts. Voltage: proportional (() -. J. The characteristic of the former - for f (x) - is chosen in accordance with the following dependence of the analytically represented as a function, given implicitly (G),. (i (ii). The graph of this dependence with A varying within O, 25–4, is presented in Fig. 3 and corresponds to the values of the ratios v.2, –1. Thus, generator 11 ensures the formation of a proportional voltage 1 / Y (-) -l. At the output of the anti-logarithm on April 14, the value corresponds to "{I (4 (and the output of link 13 is voltage .4; -Uo-exp - (i.e., the initial amplitude of the signal. Thus, the proposed device provides the possibility of limiting the initial amplitude of the sigals with a form that differs significantly from the exponential one. s initial error EFINITIONS oshvtlitudy ovyshaet i.e. measuring accuracy and further

TOGO expands the functionality of the device, BECAUSE: it allows you to analyze the waveform. To do this, it is enough to register the values of the correction factor.

(Gormula invention

A device for analyzing nuclear magnetic resonance signals, containing a series-connected resonant amplifier and a linear detector, to the output of which two integrators are connected, the outputs of which are connected to low-pass filters connected to the outputs of the main division link, the correction factor generator, the main multiplier link, one the input of which is connected to the output of one of the low-pass filters, A is connected to the input of the recording unit, the control unit whose outputs are connected to the input integrators and the registration unit, differing from the fact that, in order to expand

functionality, it additionally introduces a multiplying and dividing link, a logarithm and an anti-logarithm, while the output of the main splitter link is connected through a logarithm to the inputs of the additional splitter link k of the delay line, the output of which is connected to the input of the additional splitter and multiplying links, and the output of the additional multiplier the link is connected to the input of the anti-logarmator connected at the output to the input of the main multiplier link, ia the output of the additional dividing signal the vein is connected to the second 5 input of the additional multiplier through the shaper of the correction factor.

Sources of information taken into account in the examination

1.Orlov G.L. and others. Device

0 calculating the initial amplitude of the magnetic logging signals. . g. Lime Universities ser. Oil and Gas, 1974, 4, p. 68-76.

2. US patent 3479579,

5 cl. G 01 V 3/14, publ. 1969 (prototype). .

ILL, 16

1

Claims (1)

Claim A device for analyzing signals of nuclear magnetic resonance, comprising a resonant amplifier and a linear detector connected in series, to the output of which are two integrators, the outputs of which 15 are connected to low-pass filters connected at the outputs to the inputs of the main dividing link, a correction factor shaper, the main multiplier , one input 20 of which is connected to the output of one of the low-pass filters, and the output is connected to the input of the registration unit, the control unit, the outputs of which are connected s with integrator inputs and ^ 5 registration unit, characterized in that, in order to expand the functionality, it additionally includes multiplier and dividing links, a logarithm and an anti-logarithm, while the output of the main dividing even is connected through the logarithm to the inputs of the Additional dividing link And lines delays, the output of which is connected to the input of additional del. • multiplier and multiplier links, with the output of the additional multiplier link connected to the input of the anti-logarithm connected at the output to the input of the main multiplier link, and the output of the additional multiplier link connected to the second input of the additional multiplier link through the shaper correction factor.