High-speed gated image intensifier units (hereafter gated I.I. units) are able to capture an "instantaneous image" of high-speed phenomena occurring within extremely short time durations by means of "gate operation (shutter operation)". Gate operation is basically the same function as a camera shutter, but gated I.I. units perform this operation electronically in a minimum gate time of 1/300 000 000th of a second. Another feature is that background light and excitation light outside the measurement time can be eliminated by synchronizing the gate operation with a laser pulse or other signal.
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