SU1242865A1 - Device for measuring absolute value magnetic induction vector - Google Patents

Abstract

The invention relates to the field of magnetic measurements and can be used when conducting geological prospecting. The purpose of the invention is to improve measurement accuracy. The device contains orthogonally oriented ferromodulation transducers 1, 2 and 3, excitation generator 4, adder 5 and recording device 6. Introduction to the device of delay lines 7 and 8, phase controlled generator 9, divider 10 pulse frequency, limiting amplifier 11, adder 12 detector 13 and the formation of new links between it and the elements of the device expands the operating frequency band. In addition, the use of high-speed analog blocks in the calculation of the modulus of the magnetic induction vector makes it possible to increase the measurement accuracy, the modulus of the magnetic induction vector with a rapid change in its magnitude and increase in magnitude. 2 Il. (/) d 4 th U1 f Figure 1

Description

one

The invention relates to the field of magnetic measurements and, in particular, can be used during geological prospecting.

The aim of the invention is to improve the measurement accuracy by expanding the band of operating frequencies.

Fig. 1 is an electrical block diagram of the device; FIG. 2 shows a vector diagram computed by 10 neither a module of a magnetic induction vector.

A device for measuring the modulus of the magnetic induction vector contains the first 1, second 2 and third 3 orthog Excitation ferromodulation transducers 1 and 2 with frequency i. The voltage from the output of converter 1, equal to U; in2i:, where U is the amplitude of the second harmonic voltage at the output of the ferromodulation converter 1, is fed to the input of the delay line 7, which provides the second harmonic voltage of the excitation frequency (2 (0) in phase at -. At the output of the delay line 7, a signal is formed that is equal to UI sin (2) "3t -, which is fed to the first input of the adder 5. From the output of the ferromodulation converter, 2 oriented to the second input of the adder 5

These are transducers, excitation generator 4, first adder 5, registering device 6, first 7 and second 8 delay lines, phase-controlled oscillator 9, divider 10 of pulse frequency, amplifier limiting 11., second second ftop 12 and detector 13, the output of excitation generator 4 is connected to the inputs of the first 1 and second 2 ferromodulation converters the output of the first ferromodulation converter 1 through the first delay line 7 is connected to the first input of the first adder 5, and the output of the second 2 to the second input of the first sumo 5 D which is connected to the first controller of the second adder 12 and through series-connected amplifier-limiter 11, frequency divider 10 and phase-controlled generator 9 to the input of the third ferromodulation converter 3, the output of which is connected via the second delay line 8 to the second input of the second adder 12, output which, via detector 13, is connected to a recording device 6.

The device works as follows.

Ferromodulation converters

1-3 are sensors of magnetism and frequency of the output signal of excitation generator 4, but are shifted relative to it in phase by f

From the output of the ferromodulation converter 3, the signal Ujsin (2a) t comes to the input of the delay line 8, where the amplitude of the voltage of the second harmonic at the output of the converter 3. Line 8 of the delay shifts it in phase to -. At the exit of the delay line

55 a voltage U sin is formed (- 2 the voltage is fed to the first input of the adder 12, the second of which is fed a signal

field in the form of two rods with windings and a device for isolating and amplifying the 2nd harmonic of the excitation frequency.

The output signal of each of the ferromodulation transducers 1-3 is the voltage of the second harmonic of the excitation frequency, the amplitude of which is proportional to the projection of the magnetic induction vector on the magnetic axis of the corresponding transducer.

The generator 4 produces a rectangular alternating voltage

five

ten .

428652

excitation of ferromodulation transducers 1 and 2 with frequency i. The voltage from the output of converter 1, equal to U; in2i:, where U is the amplitude of the second harmonic voltage at the output of the ferromodulation converter 1, is fed to the input of the delay line 7, which provides the second harmonic voltage of the excitation frequency (2 (0) in phase at -. At the output of the delay line 7, a signal is generated equal to UI sin (2) "3t -, which is fed to the first input of the adder 5. A signal (t, where U.2. is the amplitude of The second harmonic is n, and the V-code converter 2.

As a result of the addition of the output voltages of the delay line 7, and the converter 2, the output signal of the adder 5 produces a sum signal equal to

Ugsin (2cot -fi), where + U | its amplitude, and f arctg at Phase relative to the voltage Ug sin2tit. The sinusoidal: the voltage from the output of the adder 5 is then supplied to the amplifier limiter 11. The latter converts it into a square wave signal, which is fed to the input of the frequency divider 10, which reduces the frequency of the rectangular signal by 2 times. The output voltage of the frequency divider 10 is fed to the control input of the phase - controlled oscillator 9 and synchronizes it in phase. The output voltage of the phase-controlled generator 9 serves as the excitation voltage of the converter 3 and has the form, amplitude and frequency uJ, equal to the form, amplitude

(2iOt -) from the output of the adder 5 As a result of the addition of these signals, the voltage U sin (2a} t - ft fz) is formed at the output of the adder 12. where 2: arctg -Y |, a S / U | + U | yu2- -u | -i-u | - its amplitude, t. e, its amplitude is proportional to the modulus of the magnetic induction vector of the measured field. This voltage is then rectified by detector 13 and fed to a recording device 6.

Claims (1)

The use of high-speed analog blocks in the calculation of the modulus of the magnetic induction vector allows to increase the measurement accuracy of the modulus of the magnetic induction vector with: a rapid change in its magnitude and direction. .: Invention Formula A device for measuring a module of a magnetic induction vector, containing first, second and third orthogonally oriented ferromodular transducers, excitation generator, the output of which is connected to the inputs of the first and BToiioro ferromlar 0 The first transducer, the first adder and the registering device, characterized by the fact that, in order to increase the measurement accuracy by expanding the operating frequency band, the first and second delay lines, the phase-controlled oscillator, the divider hour, Hoth pulses, and the limiting amplifier are introduced into it. , the second adder and the detector, and the output of the first - ferromodulation converter through the first delay line is connected to the first input of the first adder; the second input of which is connected to the output of the second ferromodulation converter and the output is connected to the first input of the second adder and the amplifier-limiter input, the output of which is connected via a pulse frequency divider to the input of a phase-controlled oscillator, the output of which is connected to the input of the third ferromodulation converter, the output of which is through the second delay line connected to the second input of the second adder, the output of which through the detector is connected to a recording device. Editor N.Egorova Compiled by A. Sazonov Tehred M. Khodanich Proofreader A.Obruchar Order 3700/44 Draw 728 Subscription VNISHI USSR State Committee for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Production and printing company, Uzhgorod, st. Project, 4 FIG. g