Device and method for measuring an angular speed

Details Device and method for measuring an angular speed Device and method for measuring an angular speed

1996-06-14

1997-09-16

Oda, Christine K.

Measuring and testing

Speed, velocity, or acceleration

Temperature compensator

7350416, G01P 904

Patent

active

056683170

ABSTRACT:
An angular speed measuring device includes an oscillator for producing an excitation signal which induces mechanical vibrations in a rotating tuning fork, and an analog processing circuit for processing an electrical detection signal derived from the tuning fork. The analog processing circuit comprises a temperature-independent phase shifter responsive to the excitation signal for producing two signals in quadrature. The quadrature signals are applied to two multipliers which also receive the detection signal. The output signals from the multipliers are dependent on the fixed phase shift .phi. between the excitation signal and the detection signal, which is fixed for a given tuning fork, and on the variable phase shift .psi. which is a function of the rotational speed of the tuning fork, but the multiplier output signals are independent of temperature. After A/D conversion, the multiplier output signals are processed in a microprocessor to determine the angular speed.

REFERENCES:
patent: 4930351 (1990-06-01), Macy et al.
patent: 5481914 (1996-01-01), Ward

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