Scientific and Technical Aerospace Reports
Scientific and Technical Aerospace Reports

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Publisher:

Published: 1995

Total Pages: 610

ISBN-13:

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Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.

Safety Assessment of Wearing the An/PVS-14 Monocular Night Vision Device (MNVD) and An/AVS-6 Aviators' Night Vision Imaging System (ANVIS) During 5-Ton and HMMWV Night Driving
Safety Assessment of Wearing the An/PVS-14 Monocular Night Vision Device (MNVD) and An/AVS-6 Aviators' Night Vision Imaging System (ANVIS) During 5-Ton and HMMWV Night Driving

Author: Elizabeth S. Redden

Publisher:

Published: 2002-04

Total Pages: 69

ISBN-13: 9781423549710

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The Human Research and Engineering Directorate of the U.S. Army Research Laboratory conducted an assessment to provide the data and analysis of the AN/PVS-14 monocular night vision device (MNVD) and the AN/AVS-6 aviator's night vision imaging system (ANVIS) for the safety certification process. The Communications-Electronics Command Directorate for Safety Risk Management, Fort Monmouth, New Jersey, will use the results of the assessment to determine the suitability of both devices for driving. The four characteristics assessed included: (a) the number and nature of training requirements for each system for night driving; (b) the time to complete and the number of errors made while drivers negotiated a hardtop driving course; (c) the time to complete and the number of errors made while drivers negotiated a cross-country driving course; (d) the number and nature of problems related to soldier performance, as well as the number and severity of safety hazards noted. The 15 soldiers who participated in the assessment drove with the AN/PVS-14, the AN/AVS-6, and the baseline system (AN/PVS-7D) in a predetermined sequence to equalize the environmental and learning effects between systems. Two different terrain driving courses were used: hardtop and cross country. The 15 soldiers were divided into two subgroups: 5-ton truck drivers and high mobility multipurpose wheeled vehicle drivers. Findings indicated that the soldiers were able to drive with the AN/PVS-14 MNVD and the AN/AVS-6 ANVIS as well as, if not better than, they could with the baseline system (AN/PVS-7D). No problems surfaced that should preclude safety certification of driving with the night vision devices on terrain similar to that used in the study.

Aviator's Night Vision Imaging System Preflight Adjustment/Assessment Procedures
Aviator's Night Vision Imaging System Preflight Adjustment/Assessment Procedures

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Publisher:

Published: 1994

Total Pages: 22

ISBN-13:

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Night vision goggles (NVGs) have been employed in a variety of aircraft for over 20 years. However, only recently has their application begun in fixed-wing fast movers. Research accomplished by the Aircrew Training Research Division of the USAF Armstrong Laboratory demonstrated the loss of NVG performance resulting from improper adjustments. This report describes correct adjustment procedures for the Aviator's Night Vision Imaging System, or ANVIS. The procedures described were developed so aircrews could take advantage of the adjustments available on the NVGs. Additionally, image descriptions are given to help aircrews evaluate NVG performance. Information on the proper equipment/ space needed for proper evaluation is also included. Adjustment procedures, Focusing procedures, AN/AVS-6, NVG. Alignment procedures, Interpupillary distance, ANVIS, Diopter, Night vision devices, IPD, NVD, Eye lane, Night vision goggles.

Comparative Visual Performance with ANVIS (Aviator's Night Vision Imaging System) and AN/PVS-5A Night Vision Goggles Under Starlight Conditions
Comparative Visual Performance with ANVIS (Aviator's Night Vision Imaging System) and AN/PVS-5A Night Vision Goggles Under Starlight Conditions

Author: R. E Miller (III.)

Publisher:

Published: 1984

Total Pages: 25

ISBN-13:

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Experimental testing of 10 subjects wearing the AN/PVS-5A (II GEN) night vision goggles (NVG) and ANVIS (III GEN) NVG was conducted under field conditions of ambient starlight illumination (approx. 10-5 mL). The parameters measured were: 1) binocular visual acuity (BVA), 2) stereopsis (depth perception), and 3) a subjective forced choice test. Results showed that BVA was 20/124 and 20/86 for the II and III GEN NVG, respectively. This difference was statistically as well as clinically significant. The stereopsis test results were inconclusive and variable because of the limited sample size and relative inexperience of the subjects in using NVG. Neither BVA nor stereopsis with the NVG was found to be related to standard baseline measures of these parameters in the clinic. Even though the ANVIS has better gain, resolution and sensitivity, 6 out of 10 subjects preferred the AN/PVS-5A for viewing the subjective test. This seemingly paradoxical finding was surmised to be a result of the presence or lack of scene contrast due to the differential sensitivities in the II and III GEN photocathode tubes.

Helicopter Flights with Night-Vision Goggles
Helicopter Flights with Night-Vision Goggles

Author: National Aeronautics and Space Adm Nasa

Publisher:

Published: 2018-10-19

Total Pages: 42

ISBN-13: 9781728939933

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Night-vision goggles (NVGs) and, in particular, the advanced, helmet-mounted Aviators Night-Vision-Imaging System (ANVIS) allows helicopter pilots to perform low-level flight at night. It consists of light intensifier tubes which amplify low-intensity ambient illumination (star and moon light) and an optical system which together produce a bright image of the scene. However, these NVGs do not turn night into day, and, while they may often provide significant advantages over unaided night flight, they may also result in visual fatigue, high workload, and safety hazards. These problems reflect both system limitations and human-factors issues. A brief description of the technical characteristics of NVGs and of human night-vision capabilities is followed by a description and analysis of specific perceptual problems which occur with the use of NVGs in flight. Some of the issues addressed include: limitations imposed by a restricted field of view; problems related to binocular rivalry; the consequences of inappropriate focusing of the eye; the effects of ambient illumination levels and of various types of terrain on image quality; difficulties in distance and slope estimation; effects of dazzling; and visual fatigue and superimposed symbology. These issues are described and analyzed in terms of their possible consequences on helicopter pilot performance. The additional influence of individual differences among pilots is emphasized. Thermal imaging systems (forward looking infrared (FLIR)) are described briefly and compared to light intensifier systems (NVGs). Many of the phenomena which are described are not readily understood. More research is required to better understand the human-factors problems created by the use of NVGs and other night-vision aids, to enhance system design, and to improve training methods and simulation techniques. Brickner, Michael S. Ames Research Center RTOP 505-67-11...

Evaluation of Night Vision Goggles (NVG) for Maritime Search and Rescue (HH-3/HH-60 Comparison Report)
Evaluation of Night Vision Goggles (NVG) for Maritime Search and Rescue (HH-3/HH-60 Comparison Report)

Author:

Publisher:

Published: 1993

Total Pages: 168

ISBN-13:

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Three experiments were conducted in 1989, three in 1990, and one experiment was conducted in 1991 by the U.S. Coast Guard Research and Development (R and D) Center to evaluate night vision goggles (NVGs) for their effectiveness in detecting small targets at night. Three types of NVGs have been evaluated: the AN/AVS-6 Aviator's Night Vision Imaging System (ANVIS) was evaluated onboard U.S. Coast Guard HH-3F, CH-3E, and HH-60J helicopters, and HU- 25C and RG-8A fixed-wing aircraft. The AN/PVS-5C and AN/PVS-7A NVGs were evaluated onboard U.S. and Canadian Coast Guard Search and Rescue Units (SRUS) in the 200-foot size range and onboard U.S. Coast Guard 41-foot utility boats (UTBs). During the Spring 1991 experiment, 4- and 6-person unlighted life rafts with retroreflective tape and 18- and 21-foot white boats were employed as targets during realistically-simulated search missions. Three new SRUs were evaluated and new information obtained are discussed. A total of 4098 target detection opportunities were generated for all the target types employed during the six experiments. These data were analyzed to determine which of 25 search parameters of interest exerted a statistically-significant influence on target detection probability. Lateral range curves and sweep width estimates are presented for SRU/target type combinations that contained sufficient data to support this detailed analysis. Human factors data are presented and discussed. NVGs proved to be an effective nighttime search aid for helicopter searches for small SAR targets. The results for NVG use for SAR on CG Utility Boats indicated that NVGs did not significantly enhance search performance, and their routine use is not recommended. NVG enhanced the nighttime.