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Piezoelectric Accelerometer

Aug 12, 2019

The structural form of a commonly used piezoelectric accelerometer is shown in the figure. S is a spring, M is a mass, B is a pedestal, P is a piezoelectric element, and R is a clamping ring. Figure a is a centrally mounted compression type, the piezoelectric element-mass-spring system is mounted on a circular center post that is connected to the base. This structure has a high resonance frequency. However, when the base B is connected to the test object, if the base B is deformed, it will directly affect the output of the pickup. In addition, changes in the test object and ambient temperature will affect the piezoelectric element and cause the pre-tightening force to change, which may cause temperature drift. Figure c is a triangular shear shape in which the piezoelectric element is clamped by a clamping ring on a triangular center post. When the accelerometer senses axial vibration, the piezoelectric element is subjected to shear stress. This structure has excellent isolation against deformation and temperature changes of the base, high resonance frequency and good linearity. Figure b is a ring-shear type, which has a simple structure and can be made into an extremely small, high-resonance accelerometer. The annular mass is adhered to the annular piezoelectric element mounted on the center post. Since the binder softens as the temperature increases, the maximum operating temperature is limited.

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