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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.
A description of how a piezoelectric accelerometer works in theory. A piezoelectric accelerometer is an accelerometer that employs the piezoelectric effect of certain materials to measure dynamic changes in mechanical variables (e.g., acceleration, vibration, and mechanical shock).
This device was itself derived from surplus accelerometers, originally made by Bosch, that were in operational use on the SM-65 Atlas intercontinental ballistic missile.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 ...
These changes can be the result of mass displacements inside the Earth, or of vertical movements of the Earth's crust on which measurements are being made. [c] The first gravimeters were vertical accelerometers, specialized for measuring the constant downward acceleration of gravity on the Earth's surface. The Earth's vertical gravity varies ...
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 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]
As a noun, this word refers to a book that contains maps and charts. OK, that's it for hints—I don't want to totally give it away before revealing the answer! Related: ...
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]