Application

How Quartz Flexible Accelerometers Work?

The working principle of the quartz flexible accelerometer is mainly composed of upper and lower torquers, pendulum components and servo loops. The coil is fixedly connected with the quartz pendulum by gluing, together with the coil skeleton and the pendulum to form a pendulum component, which realizes the function of detecting quality and is used to sense the external input acceleration.

The torquer consists of a yoke, a magnetic steel, a magnetic pole piece and a compensation ring. The magnetic steel selects a suitable permanent magnet material to form a permanent magnet to establish a magnetic field. The yoke and the magnetic pole piece make the magnetic field form a magnetic circuit along the yoke. Magnetic compensation, the upper and lower torquers adopt the same pole-to-top structure to achieve push-pull working mode, and the upper and lower torquers and the pendulum plate are fixed as a whole through the abdominal belt.

When there is an external acceleration input, the pendulum will leave the equilibrium position under the action of inertial force. At this time, the capacitance value of the differential capacitor composed of the upper and lower surfaces of the pendulum plate and the end surfaces of the upper and lower torquers will change, and this electrical signal will be output to the servo loop through the binding post. The amplified current signal is output to the coil, and the ampere force received by the energized wire in the magnetic field is used to restore the balance position of the pendulum through the push-pull action. When the deflection angle of the pendulum plate is small, the current is approximately linear with the input acceleration. At this time, the input acceleration can be obtained by detecting the current.

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