shutter

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shutter 

A device that provides a means (mechanical or electro-optical) for letting a beam of light pass during a given length of time.
References in periodicals archive ?
Uniformly shaded shutterless windows obscure the home interiors, but it is clear that no one is there, and this certainty adds a haunted quality to the scene.
The device's innovative field-proven shutterless operation enables the engine to work continuously for non-uniformity corrections (NUC) in real time.