Circuit arrangement for evaluating an acceleration sensor...

Details Circuit arrangement for evaluating an acceleration sensor... Circuit arrangement for evaluating an acceleration sensor...

2005-02-01

2005-02-01

Kwok, Helen (Department: 2856)

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

C073S514390

Reexamination Certificate

active

06848308

ABSTRACT:
In order to compensate for a drop in sensitivity at high rotational speeds, an acceleration sensor having an inductive measuring head (T) which cooperates with a moving Ferraris disk (F) essentially over a main magnetic field and which supplies an acceleration-dependent variable (Vdet; Vα) is expanded by an additional DC magnetic field excitation circuit (13, 14, IK, RK) with a means for driving the latter with the effect that the additional DC magnetic field acts in a compensating fashion on an eddy-current DC field, starting from a relatively high rotational speed (ω) of the Ferraris disk (F). This can be performed by amplifying the main magnetic field or by reducing the eddy-current DC field. A control signal (Vω), dependent on rotational speed, which both can be generated outside the sensor via a characteristic curve, and can be derived in the form of a control loop from the sensor signal (Vα), serves as a drive.

REFERENCES:
patent: 5363706 (1994-11-01), Lew
patent: 19828372 (1999-12-01), None
patent: 10032143 (2001-05-01), None
patent: 0661543 (1994-11-01), None
patent: WO 0123897 (2001-04-01), None

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