Process for reducing bias error in a vibrating structure sensor

Details Process for reducing bias error in a vibrating structure sensor Process for reducing bias error in a vibrating structure sensor

G - Physics

01

C

G01C 19/00 (2006.01) G01C 19/56 (2006.01)

Patent

CA 2294299

Bias error is reduced in a vibrating structure sensor having primary and secondary pick-off means (2, 3) separated by a fixed angular amount (45~) with respect to the vibrating structure by summing a proportion of the primary pick- off means output signal (10) into the secondary pick-off means output signal (15) or subtracting a proportion of the primary pick-off means output signal (10) from the secondary pick-off means output signal (15) effectively to reduce or increase the angular separation of the secondary pick-off means (3) from the primary drive means (1) by an amount sufficient to set the rate output signal from the vibrating structure to zero and thereby minimise bias error.

Selon cette invention, on réduit un défaut d'élasticité dans une sonde à structure vibrante où des capteurs primaire et secondaire (2, 3) forment un angle fixe (45·) par rapport à la structure vibrante. En l'occurrence, on prend une partie du signal de sortie (10) du capteur primaire, et on l'ajoute au signal de sortie (15) du capteur secondaire. On peut aussi prendre une partie du signal de sortie (10) du capteur primaire et la soustraire du signal de sortie (15) du capteur secondaire. On réduit ou on augmente ainsi l'angle du second capteur (3) par rapport au dispositif d'entraînement (1) d'une quantité suffisante pour ramener à zéro le signal de sortie du rapport fourni par la structure vibrante, ce qui ramène à un minimum l'erreur d'élasticité.

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