04202601 is referenced by 30 patents and cites 2 patents.

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.

Title
Training aid for use with night vision apparatus
Application Number
5/900100
Publication Number
4202601
Application Date
April 26, 1978
Publication Date
May 13, 1980
Inventor
Louis P Hartman
Roanoke
VA, US
James H Burbo
Roanoke
VA, US
Agent
Peter C Van Der Sluys
John T O Halloran
Assignee
International Telephone and Telegraph Corporation
NY, US
IPC
G02B 5/30
G02C 7/12
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