SU410412A1 - - Google Patents

Description

one

The invention relates to the field of electrical modeling.

A device for simulating electromagnetic induction tasks is known, comprising a generator connected to an antenna unit, a frequency converter connected to an electromagnetic field sensor and through transformers to a receiving-recording unit and an oscillator output level regulator.

A disadvantage of the known device is that it does not allow automating the process of measuring the components of the electromagnetic field in the simulation of frequency sounding problems. In order to keep a continuous recording of the components of the electromagnetic field, it is necessary to tune the frequency of the local oscillator with the frequency detuning equal to the intermediate one synchronously with the generator frequency. It is very difficult and difficult to build a paired oscillator with a local oscillator in the frequency range of more than two decades while maintaining accurate detuning. Possible disconnection of the generator and heterodyne frequencies leads to significant measurement error errors.

The purpose of the invention is to improve the speed of the device by automating the measurement process of the components of the electromagnetic field.

To achieve this goal, the device contains a low-frequency impulse generator connected via a switching transformer with modulators connected between an electromagnetic field sensor and demodulators connected via switching transformers to a receiving-recording unit and a generator.

The drawing shows a block diagram of an apparatus for modeling frequency sounding tasks.

The device consists of an antenna unit 1, connected to a generator 2, a low-frequency pulse generator 3, connected via an external transformer 4 to modulators 5 and 6, including between an electromagnetic field sensor 7 and demodulators -8 and 9, respectively. The demodulators 8 and 9 are connected via a separate transformer 10, 11 and 12 to the receiving and recording unit 13 and the generator 2.

The device works as follows.

Antenna unit 1, powered by generator 2, creates in the bath area a uniform electromagnetic field in the frequency range from 20 kHz to 10 MHz. The measured electromagnetic field (E and H) from the sensor of the electromagnetic field 7 is fed to the modulators 5 and 6, where it is modulated by a pulse voltage from a pulsed low-frequency generator 3 and fed

to demodulators 8 and 9. In demodulators, a high-frequency voltage, supplied through transformer 11 from generator 2, produces a pulsed low-frequency voltage proportional to the amplitude of the input signal. This voltage is transmitted through the switching transformers 10 and 12 to the receiver-recording unit. All flexible transformers must have a small parasitic capacitance between the windings.

Subject invention

A device for simulating frequency sounding tasks, comprising a generator.

An electromagnetic zero sensor and separate transformers connected to the antenna unit, the first and second of which are connected to a receiving and recording unit, characterized in that, in order to increase speed, the device contains modulators, demodulators and a low-frequency pulse generator connected the third switching transformer with modulators connected between the electromagnetic field sensor and demodulators connected to the first, second and fourth switching transformers connected to the generator RU.