Optical chopper

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Spectrum Detector has introduced a general-purpose digital optical chopper for use with its pyroelectric detectors and instruments. The chopper includes a five-digit LED display, push button controls and a bi-directional Rs-232 connection. It runs from four to 5000 Hz stand alone or driven by an external clock. The chopper includes a precision-etched blade with between three and 30 slots and two fixed apertures.