SU842653A1 - Method of measuring magnetic field strength - Google Patents

Description

(54) METHOD OF MEASURING THE TENSION OF MAGNETIC FIELD

The invention relates to a measuring technique and can be used to create measuring devices for magnetic fields that vary widely. The electrodynamic method of measuring the intensity is known, in which a movable measuring element is used, a frame with a current, the deviation angle of which is a court of magnitude 1. The disadvantage of the known method is the difficulty of its implementation and the complexity of manufacturing devices that implement the method. There is also known a method for measuring the intensity of a magnetic field, based on its interaction with a moving magnetic contact. The measured field is placed; the magnetically open contact is changed, the angular position of its longitudinal axis is determined, the angle between the position of this axis is determined at the moment of operation, according to the magnitude of which the value 12 is judged. However, in a known manner, it is impossible to measure a field with a voltage less than the intensity of operation of a push-open contact. The purpose of the invention is to improve accuracy. To achieve this goal, in the method of measuring the intensity of a magnetic bar, which consists in placing a magnetically controlled ball in the measured magnetic field, the angular position of its longitudinal axis is changed, the angle between the positive axis is determined when the magnetically controlled contact is activated , they create an additional magnetic field with a voltage whose magnitude is equal to the tension of the operation of the magnetic-controlled contact, and the direction coincides with the direction of its longitudinal axis, rotate the magnetic control The first contact together with the additional magnetic field until the first actuation of the magnetically controlled contact synchronously rotates the magnetically controlled contact and the additional magnetic field in opposite directions until the second actuation of the magnetically controlled contact, and in the angle between the positions of the magnetically controlled contact corresponding to the points of its operation , judge the intensity of the magnetic field. FIG. 1 shows a kinematic diagram of a device implementing a method for measuring the strength of a magnetic field; in fig. 2 is an electrical diagram and a vector diagram at the time of operation. A device implementing the method comprises a magnetically controlled contact hypercon 1, mounted in a holder 2, connected by a shaft 3 to a gear 4 rotating in direction 5 when the satellite b of the manual actuator 7 is turned counterclockwise. In this case, the Helmholtz coil 8, fixed in the holder 9 and connected to the gear 10 by a hollow shaft 11 / through which the shaft 3 is passed, rotates in a direction 12 opposite to the direction 5 (Fig. 1). The reed switch 1 is connected to the direct current source 13 through the kidney 14 indicator lights. The coil 8 through the current stabilization stage 15 and the button 16 is connected to the direct voltage source 17 (Fig. 2). The method is carried out as follows. Fixing the reed switch 1 and the coil B in the position / manual drive 7 indicated in FIG. 1 rotate the satellite 6 counterclockwise, arrows. Gear 4 is disengaged from satellite b, and the tooth of shaft 3 enters the groove of shaft 11. If light bulb 14 does not light up, then the intensity of the measured field strength of contact triggering. The button 16 is pressed. The current stabilized by the cascade from the source 17 enters the coil B, which forms an additional constant magnetic field with a strength equal to Hc D of the contact. The reed switch 1 (together with the coil 8) is rotated to the trigger position. Turn the reed switch 1 and the coil B by 90 ° to the position of non-resettable vanilla. The gear 4 is brought into engagement with the satellite 6 (shafts are not fixed). At the same time gears 4 and 10 rotate synchronously in opposite directions, and, consequently, the reed switch 1 and coil B associated with them. According to the position of the reed switch, the angle d is determined, the bisector of which determines the direction of the measured mag ity field, . With respect to this direction, the axis of the reed switch is always at the same angles. When the reed switch is triggered, its position relative to the measured field is an angle fi equal to half the angle cL. Then, f "Claim method The method of measuring the intensity of the magnetic field, which consists of placing the magnetic contact in the measured magnetic field, changing the angular position of its longitudinal axis, determining the angle between the positions of this axis when the magnetic contact is activated, different the fact that, in order to improve accuracy, they create an additional magnetic field with a voltage whose magnitude is equal to the strength of the operation of the magnetically controlled contact, and the direction coincides with its direction the odnol axis, the magnetically controlled contact together with the auxiliary magnetic field until the first actuation of the magnetically controlled contact, rotates the magnetically controlled contact and the auxiliary magnetic field in opposite directions until the second actuation of the magnetically controlled contact, and the angle between the positions of the magnetically controlled contact contact, corresponding to the moments of its operation, judging the intensity of the magnetic field. Sources of information taken into account in the examination 1. Gechernikov V.I. Magnetic measurements, Moscow State University, 1963. 2 USSR Copyright Certificate 440620, cl. G 01 R 33/02, 1973.

V i

N-

Y j

„

of

12

Claims (1)

Claim The method of measuring the magnetic field strength, which consists in placing a magnetically controlled contact in a measured magnetic field, changing the angular position of its longitudinal axis, determining the angle between the positions of this axis when the magnetically controlled contact is triggered, characterized in that, in order to increase accuracy, create an additional magnetic a field with intensity, the value of which is equal to the response intensity of the magnetically controlled contact, and the direction coincides with the direction of its longitudinal axis, rotate magnetically a controlled contact together with an additional magnetic field until the first actuation of the magnetically controlled contact synchronously rotates the magnetically controlled contact and the additional magnetic field in opposite directions until the second actuation of the magnetically controlled contact, and the magnetic tension is judged by the angle between the positions of the magnetically controlled contact corresponding to its operation_ fields.