SU113053A1 - Device for measuring linear accelerations - Google Patents

Description

To measure linear accelerations, devices are used that contain a capacitive or other differential sensor included in a self-balancing bridge measuring circuit, an amplifier and a reversible electric motor acting on the moving element of the sensor. The proposed device differs from the known devices of this kind in that the moving element of the sensor is mounted on an elastic metal thread. tensioned on a frame pivoting about its axis, connected through a reducer with a reversible electric motor.

Such an embodiment of an elastic element that creates a counteracting moment and simultaneously serves as an elastic suspension of the inert mass of the acceleration sensor, makes it possible to increase the sensitivity of the device and the accuracy of measurements.

FIG. 1 shows the kinematic scheme of the device proposed; in fig. 2 - its basic electrical circuit.

On the vertical frame of the device, tensioning the elastic thread 2, on which the movable element 5 of the capacitive or other differential sensor 4 is fixed.

Capacitive sensor 4 is included in a self-balancing pavement measuring circuit with an amplifier 5 and a reversible electric motor 6 acting on the moving element of the sensor.

The proposed device operates as follows.

When an acceleration occurs, the movable element 3 of the sensor 4 deviates from the middle position, as a result of which the equilibrium of the currents in the arms of the bridge is disturbed.

The signal from the bridge is fed to the amplifier 5, and then to the reversing motor 6. The motor 6 through the gearbox 7 rotates the frame 1, which twists the thread 2 and returns the movable element of the sensor 4 to the equilibrium position. Since the moment created by the thread is proportional to the twist angle, the angle of rotation of the frame / is proportional to the acceleration.

№ 113053

The angle of rotation of the frame / can be converted into a number of pulses, for example, by means of a slotted disk 5, an illuminator 9 and a photocell 10.

The measurement range of the proposed device is determined mainly by the permissible time of the transient process of the system.

Due to the fact that the friction of the moving element of the sensor 4 in the thread and the air is very small, the damping of the oscillations that occur when changing its position is very slow. Therefore, in order to quickly accelerate the moving system of the sensor 4, a permanent magnet is used in the device and creating damping.

Subject invention

A device for measuring linear accelerations using a capacitive or other differential sensor included in a self-balancing bridged measurement circuit with an amplifier and a reversing electric motor acting on a moving element of the sensor, characterized in that, in order to increase the sensitivity and accuracy of measurements, the moving element of the sensor is inert mass, fixed on an elastic metal “iti, stretched on a frame pivotal relative to the axis of the thread, conjugated through a reducer with the indicated reverse an apparent engine.

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