Browse Prior Art Database

Angular Accelerometer

IP.com Disclosure Number: IPCOM000091141D
Original Publication Date: 1969-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 45K

Publishing Venue

IBM

Related People

Beye, B: AUTHOR [+2]

Abstract

This device produces a linear output voltage proportional to angular acceleration without any differentiation being required. The sensor assembly consists essentially of four transducer beams mounted on a small block. Each transducer beam carries a semiconductor transducer element which changes resistance when strained. The moment of inertia is very low.

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Angular Accelerometer

This device produces a linear output voltage proportional to angular acceleration without any differentiation being required. The sensor assembly consists essentially of four transducer beams mounted on a small block. Each transducer beam carries a semiconductor transducer element which changes resistance when strained. The moment of inertia is very low.

Acceleration of the sensor assembly about its axis deflects the four transducer beams producing a resistance change in each transducer element. Adjacent beams have transducer elements oriented in opposite directions. Thus, if two adjacent beams are deflected in the same direction, their transducer elements show resistance changes of opposite direction. The four transducer elements are connected in pairs in two arms of a bridge circuit with fixed resistors and a balancing potentiometer forming the other two arms.

Clockwise acceleration of the sensor assembly about the rotational axis increases the resistance in two elements connected in series in one arm and a decrease in the other two elements. The magnitude of the resistance change is proportional to acceleration. Thus, the output of the bridge is a voltage signal proportional to angular acceleration. Linear acceleration upward of the sensor assembly causes the resistance of two elements in different arms to decrease and the other two elements in those arms to increase. Thus, the net bridge output is zero. This also cancels the effect of gr...