ANVIS Objective Lens Depth of Field.

McLean, William E.

doi:10.21236/ada306571

Cited by 4 publications

(3 citation statements)

References 4 publications

(3 reference statements)

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“…With the very fast objective lens for ANVIS (f#/ 1 .2), detectable blur was found with as little as 0.05 diopter of objective lens misfocus. 21 The latest fielded image intensification (12) version (ANVIS-9) incorporates a fme focus objective lens where 2 turns (720 degrees rotation) change the focus from infmity to 1 meter (1 diopter). Objective lens focus with the ANVIS-9 or the Air Force 4949 is both more precise and much more stable during flight.…”

Section: Optical Adjustmentsmentioning

confidence: 99%

<title>Helmet-mounted display human factor engineering design issues: past, present, and future</title>

Licina

Rash

Mora

et al. 1999

Helmet- And Head-Mounted Displays IV

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An often overlooked area ofhelmet-mounted display (HMD) design is that of good human factors engineering. Systems which pass bench testing with flying colors can often fmd less enthusiastic acceptance during fielding when good human factors engineering principles are not adhered to throughout the design process. This paper addresses lessons learned on the fielding ofthe AH-64 Apache Integrated Helmet and Display Sight System (IHADSS) and the Aviator's Night Vision Imaging System (ANVIS). These lessons are used to develop guidance for future HMDs in such diverse areas as: user adjustments, anthropometry, fit and comfort, manpower and personnel requirements, and equipment compatibility.

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Section: Optical Adjustmentsmentioning

confidence: 99%

<title>Helmet-mounted display human factor engineering design issues: past, present, and future</title>

Licina

Rash

Mora

et al. 1999

Helmet- And Head-Mounted Displays IV

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show abstract

“…This means 1 degree of objective lens rotation equates to approximately 0.03 diopter. With the very fast objective lens for ANVIS (f#/ 1.2), detectable blur was found with as little as 0.05 diopter of objective lens misfocus (McLean, 1996). The latest fielded I2 version (ANVIS-9) incorporates a fine focus objective lens where 2 turns (720 degrees rotation) change the focus from infinity to 1 meter (1 diopter).…”

Section: Optical Adjustmentsmentioning

confidence: 99%

Design Issues for Helmet-Mounted Display Systems for Rotary-Wing Aviation.

Rash¹,

McLean²,

Mora³

et al. 1998

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Orders will be expedited-if placed through the librarian or other person designated to request documents from DTIC. Change of address Organizations receiving reports from the U.S. Army Aeromedical Research Laboratory on automatic mailing lists should confirm correct address when corresponding about laboratory reports. Disuosition Destroy this document when it is no longer needed. Do not return it to the originator. Disclaimer The views, opinions, and/or findings contained in this report are those of the author(s) and should not be construed as an official Department of the Army position, policy, or decision, unless so designated by other official documentation. Citation of trade names in this report does not constitute an official Department of the Army endorsement or approval of the use of such commercial items.

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“…Technical trade-offs among the NVG design parameters result in performance trade-offs, which contribute to documented changes to visual perception. For example, NVGs are known to affect pilot visual perception by reducing the pilot's available field-of-view (Haworth et al, 1996;Edwards et al, 1997;Jennings et al, 1997) and by degrading acuity (McLean 1996) and contrast (Rabin 1996). These aspects of visual perception are important to the precise control of an aircraft during flight.…”

Section: Introductionmentioning

confidence: 99%

Handling qualities comparison of panoramic night vision goggles and 46-deg. night vision goggles

2003

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Night Vision Goggles allow the user to see in extremely low illumination levels but the visual information provided by Night Vision Goggles has a limited field-of-view that diminishes handling-qualities in the night flying environment. Panoramic Night Vision Goggles were designed to correct this problem by providing a 100º horizontal field-of-view which is larger than currently used Night Vision Goggles. However, in the first generation Panoramic Night Vision Goggle, the improved field of view came at the cost of diminished resolution, contrast and central overlap area when compared to conventional Night Vision Goggles. This paper describes an evaluation that was conducted in the variable stability NRC Bell-205 helicopter to examine the influence on system handling qualities of the Panoramic Night Vision Goggles and a 46º field-of-view UK Night Vision Goggle. Five pilots flew the ADS-33D hover, sidestep and pirouette manoeuvres in simulated night conditions with the UK Night Vision Goggle and the Panoramic Night Vision Goggle. Both subjective and objective measures of task performance were obtained. Handling-qualities ratings showed the pirouette was performed better with the Panoramic Night Vision Goggles. This was the only manoeuvre where there was a clear-cut handling qualities improvement when using the Panoramic Night Vision Goggles. Other manoeuvres such as the sidestep and hover did not show definitive handling qualities rating differences between the two Night Vision Goggle types. The flight test results were interpreted in terms of the design trade-offs of the two night vision systems, with regard to the different acuity, binocular overlaps and fieldsof-view.

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ANVIS Objective Lens Depth of Field.

Cited by 4 publications

References 4 publications

<title>Helmet-mounted display human factor engineering design issues: past, present, and future</title>

<title>Helmet-mounted display human factor engineering design issues: past, present, and future</title>

Design Issues for Helmet-Mounted Display Systems for Rotary-Wing Aviation.

Handling qualities comparison of panoramic night vision goggles and 46-deg. night vision goggles

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