Temperature compensation of liquid-crystal etalon filters

G - Physics – 02 – F

Patent

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G02F 1/133 (2006.01) G02B 5/24 (2006.01) G02F 1/21 (2006.01) H04B 10/06 (2006.01) G02F 1/01 (2006.01)

Patent

CA 2112390

A compensator for thermal or other uncontrollable effects in a liquid-crystal etalon filter (10). The narrow pass band of the filter is controlled by adjusting the amplitude (48) of an AC drive signal (44, 46) applied to the electrodes (22, 24) on either side of the liquid crystal (26) in the filter. An optical detector (36) detects the intensity of light (30) from a narrow-bandwidth input beam (34) passed by the detector. Electrical circuitry (40) determines the bipolar amplitude of the component of the light intensity that is at twice the frequency of the AC drive signal (the doubled-frequency amplitude) and adjusts the amplitude (48) of the AC drive signal in response to the doubled-frequency amplitude so as to reduce the doubled-frequency amplitude toward zero.

Dispositif permettant de compenser les effets thermiques ou d'autres effets incontrôlables dans un filtre étalon à cristaux liquides (10). On règle la bande passante étroite du filtre en ajustant l'amplitude (48) d'un signal de commande (44, 46) à courant alternatif appliqué aux électrodes (22, 24) situées de chaque côté des cristaux liquides (26) du filtre. Un détecteur optique (36) détecte l'intensité de la lumière (30) provenant d'un faisceau d'entrée (34) à bande étroite que l'on fait passer devant le détecteur. Un circuit électrique (40) détermine l'amplitude bipolaire du composant de l'intensité lumineuse qui se trouve à deux fois la fréquence du signal de commande à courant alternatif (l'amplitude à fréquence doublée) et ajuste l'amplitude (48) du signal de commande en réponse à l'amplitude à fréquence doublée afin de ramener l'amplitude à fréquence doublée proche du zéro.

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