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  • Selecting Accelerometers for and Assessing Data from Mechanical Shock Measurements
    After first clarifying what mechanical shock is and why we measure it,. basic requirements are provided for all measurement systems that. process transient signals. High- and low-frequency dynamic models for. the measuring accelerometer are presented and justified. These models. are then used
  • How High in Frequency Are Accelerometer Measurements Meaningful
    by the term pyrotechnic shock (pyroshock). Unfortunately, in spite of the advantage provided by the high. resonant frequencies of these accelerometers, the extremely low. intrinsic damping of silicon acts as a counterbalance. The result of. this low damping is often over-ranging and breakage
  • Introduction to Charge Mode Accelerometers
    Dytran charge mode accelerometers are designed to measure shock and vibration phenomena over a broad temperature range. These accelerometers, unlike the Low Impedance Voltage Mode (LIVM) types, contain no built-in amplifiers. Dytran's charge mode accelerometers utilize high sensitivity piezoceramic
  • Accelerometer Mounting Considerations
    An accelerometer is an instrument that senses the motion of a surface to which it is attached, producing an electrical output signal precisely analogous to that motion. The ability to couple motion, (in the form of vibration or shock), to the accelerometer with high fidelity, is highly dependent
  • Introduction to LIVM Accelerometers
    Low Impedance Voltage Mode (LIVM) accelerometers are designed to measure shock and vibration phenomena over a wide frequency range. They contain integral IC electronics that converts the high impedance signal generated by the piezo crystals to a low impedance voltage that can drive long cables
  • Why is MEMS the Preferred Technology for High Shock Measurement?
    associated with high-amplitude,. high-frequency mechanical shock. An unsung hero, a chemist named. Ralph Plumlee at Sandia National Labs, researched this phenomenon. In 1971 Plumlee issued a 73 page report distributed to manufacturers. of shock accelerometers detailing the dipole switching mechanisms
  • Development of a Damped Piezoresistive MEMS High Shock Sensor
    Piezoresistive (PR) silicon accelerometers with micro-electromechanical systems (MEMS) technology are preferred in many high shock impact measurements. These devices exploit the strength of single crystal silicon (SCS) along with the minimal zero shifting associated with PR sensors. However
  • Field Evaluations of a Damped MEMS Shock Sensor
    Results from pyrotechnic, penetration and metal-to-metal impact field evaluations are presented which prove the performance of a new piezoresistive (PR) shock accelerometer. The microelectromechanical systems (MEMS) sensor incorporates sufficient squeeze-film damping to reduce resonant
  • Low Outgassing Accelerometers and Cables for Thermal Vacuum and Vibration Test Environments
    Exposure to the high vacuum level of a space environment induces material outgassing in ordinary accelerometers and cables. Any substance subjected to a vacuum has the potential to release trapped gasses. Contaminants from outgassing can condense onto nearby surfaces such as photo-optic devices