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Spectral Filtering
Spectral filtering is a powerful processing operation that configures the PhotoniQ to selectively acquire data based on a match to a user-defined discrimination function. Operating on an event by event basis, the spectral filter processor compares the 32 channel spectrum of an event to that defined by the user. If the event matches the filter criteria, the event is tagged in the log file and a logic-level marker pulse is generated on the general purpose output of the PhotoniQ. To minimize the data processing load to the user’s application on the host PC, a special configuration switch is available to block events that do not meet the filter criteria from being output. When this switch is set, only data that generates a true response to the filter criteria is transmitted to the host.
Spectral filtering parameters are entered by the user through three tabbed panes in the GUI. The spectral filtering processor operates on spectral bands defined in the Band Definition pane according to a Boolean expression defined in the Flag Definition and Discriminant Definition panes. If the user decides to interface directly to the PhotoniQ without using the GUI, the parameters are entered by programming a configuration table in the PhotoniQ’s memory. |
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