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How does an altimeter detect altitude?
How does an accelerometer detect acceleration?
How does an accelerometer detect acceleration?
Filip Larsen said:An accelerometer measures acceleration typical via some variation of the principle of inertia, that is, by applying Newtons law of motion to a mass in linear or rotational movement, but there are many different implementations depending on sensor speed, resolution, size and cost and pretty much any mechanical stretching, compression, bending, or change in vibration frequency can be used as basis for a sensor. I believe a typical modern accelerometer is a micro-electro-mechanical (MEMS) device measuring the change of resonance frequency due to acceleration on a vibrating part of the device, but there are also fiber-optic accelerometers that uses interferometry to measure the shift of a small mass, or gyroscopic devices that uses the gyroscopic forces on a rotating mass to measure rotational speed.
That is correct. There is no way to locally sense the acceleration due to gravity by any means.Ranku said:If so, is there no way to build an accelerometer that will sense the acceleration of free fall?
Ranku said:I read that a person in gravitational free fall won't be able to detect his acceleration, even if he were consulting an accelerometer, because according to the principle of equivalence he is in a locally inertial frame, and therefore his accelerometer does not detect acceleration.
An altimeter is a device used to measure altitude, or the height above a certain point. It is commonly used in aviation to determine the altitude of an aircraft.
An altimeter works by measuring air pressure. As altitude increases, air pressure decreases, and the altimeter senses this change in pressure to calculate the altitude. This is known as barometric altitude.
An accelerometer is a device used to measure acceleration, or the rate of change of velocity. It is commonly used in vehicles, smartphones, and other devices to detect movement and orientation.
An accelerometer works by using a small mass on a spring to measure changes in acceleration. When the device moves, the mass also moves, and this movement is converted into an electrical signal that can be measured and used to determine acceleration.
Altimeters are commonly used in aviation, hiking and mountaineering, and weather forecasting. Accelerometers are used in a wide range of devices, including smartphones, drones, gaming controllers, and cars for features such as motion sensing, gesture recognition, and stability control.