Method and apparatus for covertly viewing a target using infrared radiation
First Claim
1. A method for covertly viewing a target using transmission of infrared radiation through an atmosphere having given atmospheric conditions, comprising the steps of:
- illuminating a target with only a selected frequency band of infrared radiation having the least effective transmittance properties of all frequencies of infrared radiation in said given atmospheric conditions; and
detecting reflection of said selected frequency band of infrared radiation from said target.
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Accused Products
Abstract
A method and apparatus for covertly viewing a target using transmission of infrared radiation through an atmosphere having given atmospheric conditions. The target is illuminated with only a selected frequency band of infrared radiation having the least effective transmittance properties of all frequencies of infrared radiation in the given atmospheric conditions. This selected frequency band of infrared radiation is reflected from the target and detected. The selected frequency band of infrared radiation may be generated by generating a broad spectrum of infrared radiation and filtering this broad spectrum to output only the selected frequency band of infrared radiation. Alternatively, a laser may be employed to output the selected frequency band of infrared radiation.
28 Citations
9 Claims
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1. A method for covertly viewing a target using transmission of infrared radiation through an atmosphere having given atmospheric conditions, comprising the steps of:
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illuminating a target with only a selected frequency band of infrared radiation having the least effective transmittance properties of all frequencies of infrared radiation in said given atmospheric conditions; and detecting reflection of said selected frequency band of infrared radiation from said target. - View Dependent Claims (2, 3)
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4. An apparatus for covertly viewing a target using transmission of infrared radiation through an atmosphere having given atmospheric conditions, comprising:
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means for illuminating a target with only a selected frequency band of infrared radiation having the least effective transmittance properties of all frequencies of infrared radiation in said given atmospheric conditions; and means for detecting reflection of said selected frequency band of infrared radiation from said target. - View Dependent Claims (5, 6, 7, 8, 9)
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Specification