SU666483A1 - Two degree-of-freedom accelerometer - Google Patents

Description

(54) TWO-STEP-BY ACCELEROMETER qi and the relative position of the poles of the upper closing part of the magnetic system and the fixed electrodes of the angle sensor; Fig. 4 shows the configuration of the lower part of the magnetic system. The aselerometer contains a nonmetallic magnetic sensing element 1, consisting of a cylindrical rod with thinning near the point of attachment and a thin circular plate attached to its end. On one side of the plate are applied, for example, by spraying four flat coils of 2 force sensors - two for each axis of sensitivity; A movable electrode of 3 capacitive angle sensors is deposited on the other side of the plate. The plate element 1 is located in the field of the permanent magnet 4, the magnetic flux of which (shown in figure 1 by the dotted line) passes through the magnetic circuit 5 of the lower part of the magnetic system, the magnetic conductor 6 of the upper part of the magnetic system and air gaps formed by the pronounced poles of the magnetic circuits. The movable electrode 3 and the four stationary electrodes 7 form two pairs of containers, the magnitude of which depends on the position of the plate in the air gap. Parts 6 and 9 serve to fasten element 1 and limit its angular displacements. The shielding magnetic circuit 10 is associated with the upper and lower magnetic fluids 5 and 6 through nonmagnetic sleeves 1 1. When an object is accelerated into a plane perpendicular to the axis of element 1, the action of inertial forces deviates from the equilibrium position. The departure is converted by capacitive angle sensors arranged in pairs

(Put 1

Claims (2)

Put 2 at an angle of 90 to an electrical signal, which in turn is converted by electronic devices into direct current, sent to the respective pairs of coils of the 2 force sensors. The interaction of the current in the coils of the 2 force sensors with the magnetic field of the permanent magnet 4 in the air gaps between the clearly pronounced poles of the magnetic cores 5 and 6 creates a force that compensates the moment of inertial forces and returns the element 1 to the equilibrium position. The magnitude of the current in coils 2 of the force sensor is a measure of the measured acceleration. Claims of the Invention A two-stage accelerometer comprising a Mat sensor on an elastic two-pole support, magnetoelectric force sensors, capacitive angle sensors and an inverse transducer, so that, in order to simplify the design, the windings of the force sensors and moving : the electrodes of the angle sensors are made flat and are located parallel to the axis of sensitivity of the accelerometer, and the magnetic system containing an annular magnet is magnetic and the geometrical axis of which is perpendicular us to the axes of sensitivity is made common to all the force sensors. Sources of information taken into account in the examination 1. US patent No. 3520197, cl. 73-516, 1966. 2. US patent 3438265, cl. 73-516, 1969. Fig.if 23 / 7 S Fig s