ECE S07 Accelerometer Types

ECE S07 Accelerometer Types - 12/06/01 MRE Panel 1...

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Unformatted text preview: 12/06/01 MRE Panel 1 Accelerometer Types Common Accelerometer Types Resistive Strain Gauge Piezoresistive Micromachined Thin-Film Capacitive Fiber Optic Servo or Force Balance Vibrating Quartz Piezoelectric 12/06/01 MRE Panel 2 Accelerometer Types Resistive Operating Principle Voltage output of resistor bridge changes proportionally with applied acceleration + Power- Signal + Signal- Power Mass Sensing Resistor #1 Flexure Sensing Resistor #2 Fixed Resistors 12/06/01 MRE Panel 3 Accelerometer Types Capacitive Operating Principle Utilizes frequency modulation technique through varying capacitor bridge Power Signal Ground Mass Sensing Capacitor #1 Built-In Electronics Fixed Capacitors ~ Sensing Capacitor #2 Flexure Insulator Insulator 12/06/01 MRE Panel 4 Accelerometer Types Resistive / Capacitive Typical Characteristics Measure down to 0 Hz (DC response) Limited dynamic range (<80 dB = 10,000:1) Limited high frequency range (<10 kHz) Often a damped frequency response (0.7% of critical) Sensitivity may vary with input (mV/g/V) Traditionally fragile (limited shock protection) Operates multi-conductor cable (at least 3 wires) Micro-machined versions are small and lightweight Performance matches cost ($10 to $1000 USD) 12/06/01 MRE Panel 5 Accelerometer Types Resistive / Capacitive Applications Low frequency and/or long duration events Ride quality Automobile road response Amusement park rides Elevator movement Motion simulators Aerospace structure modal analysis surveys Crash dummy instrumentation Tilt sensors Airbag or automobile alarm triggering devices 12/06/01 MRE Panel 6 Accelerometer Types Fiber Optic Operating Principle Amount of light gathered by receivers is proportional to applied acceleration Power Signal Ground Mass Transmitter Built-In Electronics Receiver Flexure Flexure Receiver Reflective Surface 12/06/01 MRE Panel 7 Accelerometer Types Fiber Optic Similar characteristics and applications as resistive and...
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ECE S07 Accelerometer Types - 12/06/01 MRE Panel 1...

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