Isotron® IEPE type voltage mode accelerometers features an integral electronic impedance converter eliminating the need for an external charge amplifier. An IEPE accelerometer has a fixed amplitude range. A typical charge-mode accelerometer will have an operating temperature range of –55°C to 288°C. Special-purpose accelerometers are available for extreme environments as low as –269°C to as high as 760°C. Special radiation-hardened charge-mode accelerometers are available for use in a nuclear environment. For low-level shock measurements, a general-purpose accelerometer will usually do the job. The accelerometer will need a linear range of at least 500 g and a shock survivability rating of 500 g. An IEPE type is usually preferred because they are less susceptible to producing erros. For far-field shock measurements, a special shear-mode accelerometer with a built-in electronic filter is often adequate. These are usually lightweight IEPE types with solder connections. The electronic filter attenuates the resonance frequency of the accelerometer to prevent overloading of the DA equipment.
IEPE accelerometers can drive long cables with minimal distortion and noise pick-up. Isotron® electronics are compatible with industry standard IEPE current sources built into most industry standard data acquisition systems.
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
Self-generating – no external power required
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