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Meggitt piezoelectric accelerometers are charge mode accelerometers that requires use of an external charge amplifier, allowing for reliable operation over wider temperature and amplitude ranges. Piezoelectric accelerometers are ideal choices for acceleration, shock and vibration measurements, due to their wide frequency range, easy installation, and multiple options in shapes, weights, size, and sensitivities. Special purpose piezoelectric accelerometers are also available for flight test, extreme low- and high-temperatures and radiation environments.Meggit Endevco® has successfully designed and manufactured shock accelerometers with built-in mechanical filter. This piezoelectric accelerometer features both an input mechanical filter and an electronic low-pass filter for sensor isolation and maximum bandwidth. Based on a well-established piezoelectric shock sensor, this accelerometer features a captive mechanical filter arrangement. Compared to the model of an external filter, this unique design provides mechanical isolation to the sensor (m) from all sides. High frequency energy, in the sensitive and transverse directions, is filtered by the isolation material, leaving the sensing element with only the pass-band signals. In addition, the transducer’s external housing keeps the entire assembly together in case of excessive shock input.Highlights for Piezoelectric accelerometers:
  • Extremely wide dynamic range, low output noise
  • Suitable for shock and vibration measurement
  • Excellent linearity over dynamic range
  • Acceleration signal can be integrated to provide velocity and displacement
  • Wide frequency range
  • Compact, non-contact design
  • Highly sensitive
  • Self-generating – no external power required
More product details, please click here or download practical understanding of accelerometer specifications
The sensing element of Piezoelectric accelerometers is a piezoelectric material that can be either natural quartz crystals or man-made polycrystalline ceramics. The basic principle of Piezoelectric Effect is an inherent or induced property of these crystals. As the crystal undergoes stress due to applied force during acceleration, negative and positive ions will accumulate onto the opposed surfaces of the crystal. The amount of accumulated charge is directly proportional to the applied force when the applied acceleration can be calculated according to Newtons’ law of motion F=mA.The sensing element is housed in a suitable sensor body to withstand the environmental conditions of the particular application. One side of the piezoelectric material is connected to a rigid post at the sensor base. A seismic mass is attached to the other side. Due to the piezoelectric effect a charge output proportional to the applied force is generated and the charge output signal is proportional to the acceleration of the mass. Over a wide frequency range both sensor base and seismic mass have the same acceleration magnitude so that the sensor measures the acceleration of the testing object.Piezoelectric accelerometers cannot measure constant acceleration because they are inherently AC coupled, however, they are typically the most versatile and economic choice for measuring fast transient and periodic acceleration wherever shock or vibration is of interests.A proof mass is bonded to the crystal and an electrical charge is generated when a force is imposed upon the crystal during acceleration and this output is relative to the applied force. The piezoelectric element is connected to the Sensor output via a pair of electrodes. The sensing element is housed in a suitable sensor body to withstand the environmental conditions of the particular application. One side of the piezoelectric material is connected to a rigid post at the sensor base. A seismic mass is attached to the other side. Due to the piezoelectric effect, a charge output proportional to the applied force is generated and the charge output signal is proportional to the acceleration of the mass. Over a wide frequency range both sensor base and seismic mass have the same acceleration magnitude so that the sensor measures the acceleration of the testing object. Piezoelectric accelerometers cannot measure constant acceleration because they are inherently AC coupled, however, they are typically the most versatile and economic choice for measuring fast transient and periodic acceleration wherever shock or vibration is of interests.
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