公开(公告)号：WO1993024992A1

公开(公告)日：1993-12-09

申请号：PCT/US1993004777

申请日：1993-05-17

Applicant: TAVIS CORPORATION

Inventor： TAVIS CORPORATION ,  TAVIS, John, R. ,  NICHOLSON, Laurence, R.

IPC: H03B05/12

CPC classification number: G01L1/14 ,  G01D3/0365 ,  G01D5/2208 ,  G01D18/008 ,  G01L9/105 ,  H02P25/032 ,  H03L5/02

Abstract: A variable reluctance transducer system incorporating digital control of parallel resonant circuits (L1C1, L2C1) including two inductive sensors (L1, L2) on each side of a flat diaphragm. The two parallel resonant circuits provide dual frequency signals for digital calculation to obtain a quotient of the frequencies, thereby substantially eliminating the resonant frequencies as a variable in the accuracy of the device. Manipulation of the produced quotient by a microcontroller (10) employing digital calibration tables stored in a programmable read only memory (14) allows calibration responsive to a temperature sensor (16), thereby substantially eliminating temperature induced error in the system.