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How does an Accelerometer work?


accelerometer

An accelerometer measures physical acceleration experienced by an object. An accelerometer provides an accurate measurement of acceleration, stress levels, load factors, transmissibility coefficients and fatigue values. Accelerometers are used in many industries as well as in everyday objects such as smartphones, digital cameras, and video game controllers. For accelerometers in aircrafts, AMETEK produces Piezoelectrical, and Inertial.



How does an Accelerometer work?

An accelerometer uses electromagnetic sensing that measures the vibration of a structure, in our case, an aircraft. The force that is caused by the vibration causes the accelerometer to produce an electrical charge indicating how much force was exerted. Accelerometers simplify the acceleration by converting it to measurable signals.

What types of Accelerometers are offered by AMETEK?

Piezoelectrical:

Piezoelectricity is electricity resulting from pressure. These accelerometers are available in three operating modes:

    1. Shear:  Shear mode designs bond, or "sandwich," the sensing crystals between a center post and seismic mass.
    2. Compression:  Compression mode accelerometers offer simple structure, high rigidity, and historical availability. There are basically three types of compression designs: upright, inverted, and isolated.
    3. Bender:  Bender mode designs utilize beam-shaped sensing crystals, which are supported to create strain on the crystal when accelerated.

AMETEK supplies bolted shear type accelerometers for applications up to 350°C and compression type accelerometers for applications up to 600°C.  Given a maximum mounting temperature of 490°C and maximum surrounding air temperature of 378°C.

Inertial:

Inertial accelerometers are used in military and commercial aircrafts that are equipped with digital flight data recorders, or DFDR. These provide input to the aircraft “black box” and can be analyzed if the airplane crashes. It provides lateral, longitude and vertical acceleration data.

 


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