28 January 1999 NUVU: handheld instruments for video inspection of aircraft wiring
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Abstract
Most of the current practices of manual visual inspection of aircraft wiring bundles can be replaced or assisted by a portable test system consisting of a miniature B/W or color TV camera and controllable uniform illumination mounted in a flashlight-sized, hand-held unit weighing less than one pound. The location and configuration of the battery power supply and image viewing and storage means are at the discretion of the inspector. A typical viewed area is nominally 1 inch by 1.3 inches, with a depth of field up to 1.5 inches. Tradeoffs among pixel dimensions, geometrical optics, and lens diffraction which arise in the design of such a unit are discussed. Data are presented showing actuator measured depths of field and image resolutions vs. variable camera lens aperture under real conditions. The image size in these tests provided an overall 12X enlargement of the target, as viewed by the inspector in real time. On insulated wires as small as 1mm OD, printed markings are easily seen and read, as are common chafes, radial surface cracks, and other surface anomalies of the insulation. The present mechanical design permits the small unit not only to inspect areas in any direction to which the hand and wrist can point, but also allows insertion of the unit in areas not easily accessible to the hand or eye.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
John N. Pike, John N. Pike, Yogesh Mehrotra, Yogesh Mehrotra, Herbert Kaplan, Herbert Kaplan, } "NUVU: handheld instruments for video inspection of aircraft wiring", Proc. SPIE 3586, Nondestructive Evaluation of Aging Aircraft, Airports, and Aerospace Hardware III, (28 January 1999); doi: 10.1117/12.339889; https://doi.org/10.1117/12.339889
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