Sensor having free fall self-test capability and method...

Details Sensor having free fall self-test capability and method... Sensor having free fall self-test capability and method...

2006-10-11

2009-02-10

Chapman, John E (Department: 2856)

Measuring and testing

Instrument proving or calibrating

Speed, velocity, or acceleration

C360S075000, C073S514320

Reexamination Certificate

active

07487661

ABSTRACT:
A transducer (20) includes a movable element (24), a self-test actuator (22), and a sensing element (56, 58). The sensing element (56, 58) detects movement of the movable element (24) from a first position (96) to a second position (102) along an axis perpendicular to a plane of the sensing element (56, 58). The second position (102) results in an output signal (82) that simulates a free fall condition. A method (92) for testing a protection feature of a device (70) having the transducer (20) entails moving the movable element (24) to the first position (102) to produce a negative gravitational force detectable at the sensing element (56, 68), applying a signal (88) to the actuator (22) to move the movable element (24) to the second position (102) by the electrostatic force (100) , and ascertaining an enablement of the protection feature in response to the simulated free fall.

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patent: WO 2004/044518 (2004-05-01), None
International Search Report and Written Opinion related to PCT/US07/7836 dated Jun. 20, 2008.

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