SU130194A1 - Nuclear resonance device - Google Patents

Description

BASIC Auth. St. N ° 113421 describes a nuclear-resonance instrument for the measurement of the elements of the earth's magnetic field. The gauge of the Hglac of the instrument is placed in the Helmholtz rings oriented along the magnetic meridian, through which the electric current flows. The current direction changes with the OOMOHIH compressor.

Our recommendation is to simplify the measurement process when determining the direction of the magnetic field. This is achieved by using in it a device for turning the Helmholtz rings and a device for determining the minimum amplitude of the first voltage harmonic.

Rings / Helm1-oltsa (see drawing), fed with snusondalm. Current from the tenerato) and 2 nzky frequency, create a uniform field

where // is the amplitude value of the time-varying zero, and m is the angular frequency. In the area of a uniform zero Helmholtz rings, the NoHieH sensor 3 is a precision generator, not shown on the drawing, whose frequency is proportional to the magnitude of the magnetic zero voltage.

Sensor 3 is affected by the total field

/ ---- / - + / cos w t - 2 / - cos а cos «t

where: F is the intensity of the floor, in the direction of which it is not determined, and is the angle between the direction of the force lines of the field. The signal at the output of sensor 3 is amplified by an amplifier 4 ;; arrives at the detector 5. After frequency detection from

// cos m /,

The voltage of the signal using filter 6 separates its first harmonic, which after amplifier 7 of low frequency goes to indicator 8. The absence of readings and the switch 8 indicates that the magnetic axis of the Helmholtz rings is perpendicular to the direction of the magnetic field.

In addition to the indicator, the voltage of the first harmonic of the signal from the output of the amplifier 7 is fed to two two-phase tracking motors. One of these electric motors, the electric motor 9, rotates the rings / Helmholtz until the amplitude of the first harmonic is equal to zero. To determine the minimum amplitude of the first harmonic of the voltage, a three-phase method containing the phase discriminator and amplifier, oie shown in the drawing, is applied. The output of this amplifier is connected to one of the windings of the second electric motor, not shown in the drawing.

Subject of art.

Nuclear resonance device according to ed. St. No. 113421, characterized in that, in order to simplify measurements when determining the direction of the magnetic field, it used a device for rotating the Helmholtz ring systems, made in the form of two two-phase tracking motors, each of which drives one of the Helmholtz ring systems, perpendicular A second system, and a device for determining the amplitude minimum, comprising a phase discriminator and an amplifier for supplying one of the windings of the two-phase tracking motor.