Open loop signal processing circuit and method for a fiber...

G - Physics – 01 – C

Patent

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Details

IPC codes

G01C 19/72 (2006.01)

Type

Patent

Patent number

CA 2301764

Description

A signal processing circuit (10) for a fiber optic sensor (12) includes a d.c. block (14) coupled to the fiber optic sensor (12) for removing d.c. components from the fiber optic sensor output signal, and a low pass filter (16) coupled to the d.c. block (14) for reducing noise in the fiber optic sensor output signal and generate a filtered signal. A comparator (18) is coupled to the low pass filter (16) and generates a squared signal indicative of zero crossings in the filtered signal. A lock-in amplifier or synchronous demodulator (20) is coupled to the comparator (18) and generates an output signal indicative of a phase shift in the two light waves propagating in the fiber optic sensor (12).

Ce circuit de traitement du signal (10), qui est destiné à un détecteur à fibre optique (12), comporte, couplé au détecteur à fibre optique (12), un bloc courant continu (14) permettant de supprimer les composantes courant continu dans le signal de sortie du détecteur à fibre optique. Ce circuit de traitement du signal comporte en outre, couplé au bloc courant continu (14), un filtre passe-bas (16) permettant de réduire le bruit dans le signal de sortie du détecteur à fibre optique et de générer un signal filtré. Un comparateur (18), qui est couplé au filtre passe-bas (16), génère un signal quadratisé correspondant aux transitions par zéro du signal filtré. Un amplificateur synchrone, ou un démodulateur synchrone (20), qui est couplé au comparateur (18) génère un signal de sortie correspondant au déphasage entre les deux ondes lumineuses se propageant dans le détecteur à fibre optique (12).

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