| 摘要 |
An apparatus is described that includes an emission signal detector and an emission signal filter. An excitation beam scans an array of biological materials, and the emission signal detector detects an emission signal indicative of an emission beam responsive to the excitation beam. The emission signal filter is a linear-phase filter that provides a filtered emission signal having substantially symmetrical rise and fall edges. A linear-phase excitation signal filter may also be provided that provides a filtered excitation signal having substantially symmetrical rise and fall edges. The emission signal filter and the excitation signal filter may be matched. In some applications, they may be high-order Bessel filters. Linear-phase filtering enables sampling of emission signals to be accomplished consistently irrespective of the scanning direction, and thus is particularly advantageous in bi-directional scanning applications.
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