Indicating desiccant in night vision goggles

摘要

A night vision goggle system includes a housing, and an eyepiece forming a back end of the housing for viewing an object of interest. An optical field-of-view (FOV) is formed through the eyepiece, where the FOV is defined by a cone having an apex formed adjacent to an exit pupil at the eyepiece and tapering outwardly toward the object of interest. A desiccant is disposed within the housing, and located outside the FOV. The desiccant is visible through the eyepiece when viewed from outside the FOV. In addition, when the eye of a user is placed within the FOV, the desiccant is not visible through the eyepiece; and when the eye of the user is placed outside the FOV, the desiccant is visible through the eyepiece.

主权项

1. A goggle system comprising:
a housing including an image amplifier configured to amplify an image of an object of interest and circuitry configured to operate the image amplifier; an eyepiece forming a back end of the housing for viewing the object of interest; an eyecup forming a portion of the eyepiece at the back end of the housing, the eyecup for positioning an eye of a user for viewing the object of interest; an optical field-of-view (FOV), formed through the eyepiece and the image amplifier, the FOV defined by a cone having an apex formed adjacent to the eyepiece and tapering outwardly toward the object of interest; and a desiccant disposed within the housing, and located outside the FOV; wherein the desiccant is visible through the eyepiece, and not visible through the FOV.