What physical quantity does an accelerometer measure?

Acceleration (rate of change of velocity). The answer is acceleration. The Smithsonian's How Things Fly site says an accelerometer is what measures g-force. In an aircraft it turns the acceleration the plane feels into g. The USGS found that its test sensor responds down to 0 Hz. So it feels steady gravity too. Read more: Accelerometer Applications.

A 2023 peer-reviewed paper lists three ways a MEMS accelerometer can sense acceleration. Which option names them?

A change in capacitance, resistance or charge. The 2023 paper says MEMS accelerometers detect acceleration through a change in capacitance, resistance or charge. These are the capacitive, piezoresistive and piezoelectric types. The USGS test sensor was capacitive and used surface electrodes. A peer-reviewed vehicle study also used a capacitive, single-mass device. The 2023 paper says piezoelectric designs have better temperature stability and lower power use. Read more: Accelerometer Applications.

Which reason does a 2024 peer-reviewed study give for using MEMS accelerometers to monitor structures?

Lower cost, easy installation and lower power use. The 2024 study says MEMS sensors have lower cost, easy installation and lower power use. Together they allow wide monitoring systems without batteries. It says they can correctly detect modal frequencies, which are useful for damage detection. The study's ADXL354 sensor covers plus or minus 2 g. The USGS chip that matched a lab seismometer was a prototype, not a finished product. Read more: Accelerometer Applications.

In a peer-reviewed vehicle-vibration study, which range of vibration amplitude was measured on the vehicle with MEMS sensors?

Between 0.5 g and 2.5 g. The vehicle study measured amplitudes between 0.5 g and 2.5 g. Its MEMS sensors had ranges of plus or minus 3 g and plus or minus 8 g. The piezoelectric reference sensor had plus or minus 100 g. These are sensor ranges, not the amplitudes measured. The Smithsonian site explains g by comparing acceleration with the pull of Earth's gravity. Read more: Accelerometer Applications.

Which navigation accuracy does DRDO list for an aircraft system built with a ring laser gyro and accelerometers?

1 nautical mile per hour. DRDO lists an aircraft navigation system of 1 nautical mile per hour. It uses a ring laser gyro and accelerometers. The submarine system on the same page is listed at 1 nautical mile per day. The page does not say that these are in service. The ISRO Inertial Systems Unit in Thiruvananthapuram lists accelerometer packages built in India. Read more: Accelerometer Applications.

Which statement about Uttarakhand's earthquake early warning system, launched on 4 August 2021, is supported by the sources?

It uses 170 low-cost MEMS accelerometers and warns through sirens and the BhuDEV app. A peer-reviewed paper says 170 low-cost MEMS-based accelerometers were deployed. Alerts reach people through sirens and the BhuDEV app. The 38 second lead time was for one station in the November 2022 Tehri Garhwal earthquake. It is not a general warning time. The National Center for Seismology is a separate body; the NCS page says it has more than 170 stations. Read more: Accelerometer Applications.

Over which frequency range did a 2001 NIST paper say NIST performs primary calibration of accelerometers?

50 Hz to 5 kHz. NIST's primary calibration of accelerometers covers 50 Hz to 5 kHz. Its three independent methods are fringe counting, minimum point and reciprocity. The range of 0.0001 to 0.1 Hz is the band for which LISA Pathfinder tested technology. The USGS found a flat response from 0.0125 Hz to at least 62.5 Hz for its prototype MEMS sensor. Read more: Accelerometer Applications.

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What did DARPA’s 2013 timing and inertial measurement unit (TIMU) chip from the University of Michigan contain?

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