SU1352426A1 - Device for measuring magnetic field intensity - Google Patents

Abstract

The invention relates to a measurement technique and can be used in magnetometry and flaw detection for measuring spatially non-uniform magnetic fields in a wide frequency and amplitude ranges. The purpose of the invention is to expand the functionality and increase the accuracy of measurements, which is achieved by expanding the range of measured magnetic fields to the field of strong fields. To do this, the device containing the generator 1 alternating rectangular pulses, single-rod ferrosonde, integrator 3, storage capacitor 5, DC amplifier 6 and recording device 7, additionally includes an electronic switch 4, delay lines 8, and a generator 9 of control pulses. The operation of the device is explained in the timing diagrams provided in the specification. 2 Il. Q € (L oo ate tc 4 1C Oi cfjue.i

Description

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The invention relates to a measurement technique, can be used to measure spatially inhomogeneous magnetic fields in a wide frequency and amplitude ranges, and can be used in magnetometry and flaw detection.

The purpose of the invention is to improve the measurement accuracy and expand the functionality by expanding the range of measured magnetic fields to the field of strong fields.

FIG. 1 shows a functional diagram of the device; in fig. 2 - time diagrams that show his work.

The device contains a series-connected alternating rectangular pulse generator 1, a single rod ferrosonde 2, an integrator 3 and an electronic switch 4, the input of which is connected to the common bus through a storage capacitor 5 and connected to the recording device 7 through a DC amplifier 7. Second output The generator 1 is connected via a delay line 8 to the input of the generator 9 of control pulses, the output of which is connected to the control input of the dongle 4.

The device works as follows.

Generator 1 periodically remagues the core of the fluxgate 2 with rectangular alternating current pulses of high duty cycle (Fig. 2a) whose amplitude is sufficient to saturate the core, taking into account the amplitude of the measured magnetic field. The voltage pulses induced in the output winding of the fluxgate 2 (Fig. 26) are integrated by the integrator 3, the voltage at the output of which (Fig. 2c) is proportional to the change in induction in the fluxing core 2.

The signal from the output of the integrator 3-stumbles on the electronic key 4, opened 2

shorter pI tI page (:) birun) T1 pulses, ir bt with 1 gsm controllers Control their pulses with delayed excitation pulses (Fig. 2d). By this time, the transients and memory are stopped (the capacitor 5 is charged to the maximum value (A, n. 2c). During the pauses between the pulses, the maximum value of A remains due to the high input resistance of the DC amplifier 6. As a result, The charging of the storage capacitor 5 takes place only at the moment of unlocking the electronic key 4, and the voltage on the storage capacitor 5 changes abruptly from A to A. If the measured magnetic field is H | O, then the constant The output of the DC amplifier 6 is zero (Fig. 2e). If Well, "O", the constant component is proportional to the magnitude of the measurement of the magnetic field of the magnetic field.

Claims (1)

Apparatus of the Invention A device for measuring the intensity of a magnetic field containing a series-connected excitation generator and a ferrosonde probe, a memory capacitor connected in series, a DC amplifier and a recording device that differs from the fact that, in order to improve the accuracy and functionality A series-connected delay block, a control pulse generator, and an electronic switch, as well as an integrator, whose output is connected to the second input th electronic key and input - with ferroprobes, keyer output being connected to the storage capacitor and the input of delay unit - to the second output of the generator excitation or designed as a source of alternating rectangular pulses.