Internal covert IR filter for searchlight systems

摘要

Described in this application for patent is a novel method and apparatus for modifying a searchlight from a visible-light source to an infrared source. This selective filtering is accomplished by means of a partially filtered cover about the light source which may be moved between first and second positions. In a first position, light projected by the light source passes through an unfiltered section of the lamp cover. In a second position, light projected by the light source passes through a filtered section of the lamp cover.

主权项

1. A method of converting the light output from a searchlight from a first light profile to a second light profile, the method comprising the steps of:
providing a searchlight having a reflector and light source; providing a light cover about the light source, the light cover being substantially cylindrical; providing the light cover with a first portion constructed of a transparent material whereby light from the light source through the transparent material of the first portion conforms to the first light profile; providing the light cover with a second portion constructed of a light filtering material whereby light from the light source through the lamp cover conforms to the second light profile; providing an actuator configured to move the light cover from a first position relative to the light source and reflector, whereby the light source shines through the first portion, to a second position relative to the light source and reflector different from the first position, whereby the lamp shines through the second portion; and providing a light seal around the light cover, thereby preventing light of unwanted wavelengths from leaking out from the lamp cover.