Patent ID: 6928875

Claim:
An accelerometer comprising: a first microwave cavity; a second microwave cavity; a proof mass disposed between the cavities which, in response to acceleration, increases the length of one cavity while decreasing the length of the other cavity; a first source for introducing RF energy into the first cavity to produce at least first and second standing waves at first and second resonant frequencies, at least one of the first and the second resonant frequencies changing in frequency with changes in cavity length, said first source producing first and second outputs indicative of the first and second frequencies; a second source for introducing RF energy into the second cavity to produce at least third and fourth standing waves at third and fourth resonant frequencies, at least one of the third and the fourth resonant frequencies changing in frequency with changes in cavity length, said second source producing third and fourth outputs indicative of the third and fourth frequencies; and means, responsive to said first, second, third, and fourth outputs for determining acceleration as a function of any change in the first, second, third, and fourth frequencies to compensate for non-uniform behavior between the first and the second microwave cavities.