System and methods for dynamic range extension using...

G - Physics – 01 – N

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G01N 21/64 (2006.01) G01J 1/42 (2006.01) H04N 3/15 (2006.01) H04N 5/235 (2006.01)

Patent

CA 2502881

A photo-detector 122 generated signal 125 is measured as a sample set 192 comprising a long signal and a short signal. The short signal is scaled to the value of the long signal if the long signal exceeds a dynamic range 131 associated with the photo detector 122. In one embodiment, the short signal is obtained during a short time interval that is at the approximate middle of a long time interval such that the short and long intervals share a common median time value 194. Given such symmetry, an approximately linear signal 190 yields a proportionality parameter between the long and short signals thereby allowing the short signal to be scaled. The proportionality parameter facilitates determination of an integration independent component of the photo detector signal that should be removed from the measured long and short signals before scaling. A plurality of sample sets 260 can also be processed such that each sample set overlaps with its neighboring sample set, thereby increasing the effective number of sample sets.

Selon l'invention, un signal (125) généré par un photodétecteur (122) est mesuré sous la forme d'un ensemble d'échantillonnage (192) comprenant un signal long et un signal court. Le signal court est mis à l'échelle de la valeur du signal long si ce dernier dépasse un gamme dynamique (131) associée au photodétecteur (122). Dans un mode de réalisation, le signal court est obtenu pendant un intervalle de temps court situé approximativement au milieu d'un intervalle de temps long de sorte que les intervalles court et long partagent une valeur temporelle médiane commune (194). Du fait de cette symétrie, un signal approximativement linéaire (190) produit un paramètre de proportionnalité entre les signaux long et court, ce qui permet la mise à l'échelle du signal court. Le paramètre de proportionnalité facilite la détermination d'un composant indépendant de l'intégration du signal de photodétecteur devant être supprimé des signaux long et court mesurés avant la mise à l'échelle. Une pluralité d'ensembles d'échantillonnage (260) peuvent également être traités de façon que chaque ensemble d'échantillonnage chevauche son ensemble d'échantillonnage voisin, ce qui permet d'augmenter le nombre effectif d'ensembles d'échantillonnage.

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