公开(公告)号：US11085879B1

公开(公告)日：2021-08-10

申请号：US16848229

申请日：2020-04-14

Applicant: U.S. Government as Represented by the Secretary of the Army

Inventor： David Ziegler ,  Gary Proulx ,  Stephen Giardini

IPC: G01N21/59 ,  G01N21/958 ,  G01N21/956

Abstract: An apparatus configured to fog test eyewear includes an environmentally controlled chamber, a head form disposed within the chamber, a radiator disposed within the chamber, the radiator connected to a liquid cooling system, and a humidifier device configured to deliver a flow of warm moist air towards the frontal portion of the head form and a surface of the eyewear. A camera is disposed within the head form, the camera aligned with a first opening in a frontal portion of the head form and configured to detect a target image within the chamber while the flow of warm moist air is delivered. A processor is configured to calculate a contrast difference between a background of the target image detected by the camera and resolution bars of the target image detected by the camera, plot a contrast ratio from the calculated contrast difference against a known calibration standard and calculate a performance measure of an anti-fog device of the eyewear.