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An accelerometer measures proper acceleration, which is the acceleration it experiences relative to freefall and is the acceleration felt by people and objects. [2] Put another way, at any point in spacetime the equivalence principle guarantees the existence of a local inertial frame, and an accelerometer measures the acceleration relative to that frame. [4]
This device was itself derived from surplus accelerometers, originally made by Bosch, that were in operational use on the SM-65 Atlas intercontinental ballistic missile. [1] [2] This type of accelerometer was a pendular accelerometer, where changes in gravity results in minute changes in the tension of a suspended vibrating string. These ...
An accelerograph can be referred to as a strong-motion instrument or seismograph, or simply an earthquake accelerometer.They are usually constructed as a self-contained box, which previously included a paper or film recorder [1] (an analogue instrument) but now they often record directly on digital media and then the data is transmitted via the Internet.
PIGA accelerometers mounted in the AIRS (Advanced Inertial Reference Sphere) are part of the most accurate inertial navigation (INS) developed for the Peacekeeper missile. The INS drift rates are less than 1.5 x 10 −5 degrees per hour of operation, about 8.5 m per hour with the overall accuracy of the missile affected more by defects in the ...
An accelerometer was announced that used infrared light to measure the change in distance between two micromirrors in a Fabry–Perot cavity. The proof mass is a single silicon crystal with a mass of 10–20 mg, suspended from the first mirror using flexible 1.5 μm-thick silicon nitride (Si 3 N 4) beams. The suspension allows the proof mass to ...
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President-elect Donald Trump, after rejecting House Speaker Mike Johnson's plan to avoid a government shutdown, worked the phones on Thursday, showing wavering confidence in Johnson and claiming ...
Work on quantum technology based inertial measurement units , the instruments containing the gyroscopes and accelerometers, follows from early demonstrations of matter-wave based accelerometers and gyrometers. [2] The first demonstration of onboard acceleration measurement was made on an Airbus A300 in 2011. [3]