Training aid for use with night vision apparatus
First Claim
1. In a night vision device of the type employing image intensification between an input and an output port, with said output port adapted to direct an image to the eye of a user, in combination therewith apparatus for controlling the amount of ambient light reaching said output port to enable a user to employ said night vision device in daylight conditions to aid in training the user in operation of said device under conditions prevalent in nightime operations, comprising:
- a housing having an internal hollow located between a light input port and a light output port, and means for coupling said housing to said input port of said night vision device,a variable density filter located in said hollow of said housing and capable when varied of reducing the ambient light reaching said output port according to said variation to thereby enable a user to accurately simulate nightime conditions during typical daylight conditions according to said density filter.
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Accused Products
Abstract
A filter arrangement is described which is incorporated with a night vision device. The filter arrangement consists of a variable density polaroid filter array and a blue-green filter all contained in a common housing and directed along a given optical path. The filter arrangement serves to control the amount of light directed to an input port of a night vision device such as a pair of goggles. In this manner, a user can be trained to employ the night vision device under direct supervision in daylight conditions and by variation of the polarizing plates is enabled to simulate nighttime conditions.
39 Citations
14 Claims
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1. In a night vision device of the type employing image intensification between an input and an output port, with said output port adapted to direct an image to the eye of a user, in combination therewith apparatus for controlling the amount of ambient light reaching said output port to enable a user to employ said night vision device in daylight conditions to aid in training the user in operation of said device under conditions prevalent in nightime operations, comprising:
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a housing having an internal hollow located between a light input port and a light output port, and means for coupling said housing to said input port of said night vision device, a variable density filter located in said hollow of said housing and capable when varied of reducing the ambient light reaching said output port according to said variation to thereby enable a user to accurately simulate nightime conditions during typical daylight conditions according to said density filter. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for training a user in the operation of a night vision device under daylight conditions, said night vision device of the type employing image intensification between an input port for receiving light and an output port for transmitting an intensified light image to the eye of a user, comprising the steps of:
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placing a variable density filter in the optical path of said night vision device, varying the density of said filter during daylight conditions to alter the amount of ambient light reaching said output port to thereby enable said user to accurately simulate nightime conditions during typical daylight conditions according to the variation of said density. - View Dependent Claims (12, 13, 14)
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Specification