| Panoramic Night Vision Goggle Testing For Diagnosis and Repair |
2000 |
7 pages |
| Authors:
Peter L. Marasco; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
 | During operational testing of the panoramic night vision goggles (PNVG) over the past eighteen months, the prototype systems have shown wear which has resulted in degraded performance. When a PNVG degrades to a point that pilots find objectionable, the PNVGs are sent back to the lab for repair. The lab has set up a program to assess the PNVGs received from the field to verify the probable source of the ... |
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| Night Vision Goggles Objectives Lens Focusing Methodology |
2000 |
7 pages |
| Authors:
Alan Pinkus; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Before performing an airborne mission that uses night vision goggles (NVGs), aircrew must properly set the NVG's various adjustments: interpupillary distance, tilt, eye relief, height, eyepiece and objective lens focus. Currently, aircrew use a Hoffman 20/20 test unit to pre-focus their NVG objective lenses at optical infinity before boarding their aircraft. They may also refocus their objective lenses while in the cockpit and during the course of the mission. This ... |
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| Reproducibility of Nigh Vision Goggle Visual Acuity Measurements Using Landolt C's |
08 DEC 1999 |
7 pages |
| Authors:
Alan Pinkus; H. L. Task; Sharon Dixon; Charles Goodyear; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| The main purpose of the study was to determine reproducibility limits of night vision goggle (NVG) acuity measurement under relatively high and low illumination levels. Psychometric acuity functions of three observers were repeatedly measured using Landolt C's as stimuli. The reproducibility limits of the Snellen acuity value (20/xx) relating to 50, 75 and 95% correct (adjusted for chance) were then determined. Reproducibility limit is defined as approximately 95% of all ... |
|
| Effects of Aircraft Windscreens and Canopies on HMT/D Aiming Accuracy: Part 3 |
22 FEB 1999 |
12 pages |
| Authors:
H. L. Task; Chuck Goodyear; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Modern fighter aircraft windscreens and canopies are typically made of curved, transparent plastic for improved aero-dynamics and bird-strike protection. Since they are curved these transparencies often refract light in such a way that a pilot looking through the transparency will see a target in a location other than where it really is. This effect has been known for many years and methods to correct the aircraft head-up display (HUD) for ... |
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| The Effect on Vision of Light Scatter From HMD Visors and Aircraft Windscreens |
1999 |
10 pages |
| Authors:
Peter L. Marasco; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| The amount of scattered light, or haze, typically increases as transparent materials age, wear, become dirty, or become scratched from cleaning. Light scattered from scratched aircraft transparencies, such as windscreens, head-up-display combiners, and helmet visors, can potentially reduce pilot visual performance and reduce target detection range. Presented in this paper are the results of an investigation of light scattered from transparencies exhibiting different levels of wear and surface damage. Two ... |
|
| Optical Characterization of Wide Field-of-View Night Vision Devices |
1999 |
7 pages |
| Authors:
Peter L. Marasco; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| An advanced night vision device, the Panoramic Night Vision Goggle (PNVG), presents the wearer with a large horizontal field of view (100 degrees) by combining the output from multiple image intensifier tubes. This significantly complicates the testing and evaluation of this state-of-the-art device. Current tests were considered insufficient and required modification to fully characterize conventional night vision device parameters. In addition, new tests were required to characterize parameters unique to ... |
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| Chemical Lightsticks as a Night Vision Goggle Compatible Lighting Techniques for Aircraft Cockpits: Characteristics, Pros and Cons |
18 AUG 1998 |
6 pages |
| Authors:
H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Night vision goggles (NVGs) are used for night flying in many military aircraft in the US Army, Navy, and Air Force. NVGs are seen as a means of improving flying safety by providing aircrew with a direct view of the outside world scene thereby improving situation awareness. However, NVGs cannot operate effectively in a cockpit environment unless the interior lighting is NVG compatible. NVG compatible means the lighting is sufficient ... |
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| Photographic Assessment of Dark Spots in Night Vision Device Images |
1998 |
7 pages |
| Authors:
Peter L. Marasco; Alan R. Pinkus; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSONAFB OH VISUAL DISPLAY SYSTEMS
|
| Visible defects in night vision device (NVD) images, arising from image intensifier (I2) tube defects and dirt on the device's optics, can become more than cosmetic blemishes. They can act as visual distractions and may be large enough to mask critical information pilots need to conduct normal night vision operations. This paper is concerned with the assessment of NVD dark spots. Current methods of assessing dark spots examine only the ... |
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| Measuring Observers' Visual Acuity Through Night Vision Goggles |
1998 |
10 pages |
| Authors:
Alan Pinkus; H. L. Task; AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH HUMAN EFFECTIVENESS DIRECTORATE
|
| Use of night vision goggles (NVGs) for military applications has grown steadily over the past 30 years. Each successive NVG model represents some kind of improvement in terms of size, weight, ruggedness, gain, noise, spectral sensitivity, field-of-view or resolution. The primary focus of this paper is the determination of NVG resolution. Many methods have been devised to measure the resolving power of NVGs and each method has with it an ... |
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| Repeatability and Reproducibility of NVG Gain Measurements Using the Hoffman ANV-126 Test Device |
1998 |
7 pages |
| Authors:
Denise L. Aleva; H. L. Task; Chuck D. Goodyear; AIR FORCE RESEARCH LAB WRIGHT-PATTERSONAFB OH CREW SYSTEM INTERFACE DIV
|
| Night vision goggles (NVGs) are being used extensively by our special operations forces for covert night operations. Often the individual operational units purchase the NVGs directly from the manufacturer. Upon delivery to the unit, the NVGs are tested to verify that they meet the gain specifications. The Hoffman Engineering ANV-126 portable test set is used for this purpose. However, the reproducibility of the NVG gain measurements obtained with the ANV-126 ... |
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| The Effects of Aircraft Transparencies on Night Vision Goggle-Mediated Visual Acuity |
1997 |
10 pages |
| Authors:
Alan Pinkus; H. L. Task; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
|
| Night vision goggles (NVGs) are currently used in a wide variety of military aircraft that were not originally designed for NVGs. Likewise, the windscreens and canopies on these aircraft were not designed with NVGs in mind. Present day windscreens and canopies typically have one or more specialized coatings applied to them. These may be reasonably transparent for visible wavelengths but not so transparent for near infrared light to which the ... |
|
| Design and Integration Issues of Visually-Coupled Evaluation |
MAR 95 |
139 pages |
| Authors:
H. L. Task; Dean F. Kocian; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
|
| This document is the text of a short course presented at SPIE ih 1992 and 1994 dealing with design and integration issues of visually-coupled systems (VCS). The VCS described are composed of a helmet-mounted display, a display image source, and a head helmet tracker. (AN) |
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| Backscatter Haze Device for Measurement of Haze in Aircraft Transparencies |
MAY 93 |
36 pages |
| Authors:
H. L. Task; Richard J. Bartell; Sheldon E. Unger; LOGICON INC DAYTON OH
|
| The method currently used throughout the aircraft transparency industry to measure haze is ASTM Test Method D1003. This procedure was originally developed for applications involving small, thin, and flat transparent parts. Major limitations of Test Method D1003 include its restriction to small, flat samples and its requirement for having the source and detector on opposite sides of the sample under test. In order to facilitate field testing of installed aircraft ... |
|
| Cockpit/NVG Visual Integration Issues |
1992 |
10 pages |
| Authors:
H. L. Task; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH
|
| This paper is divided into two main sections: Visual significance of NVG charactenstics and Cockpit/NVG integration issues. The first section deals with the relationship between the NVG characteristics discussed in the previous paper and visual capability. The second section explores several issues associated with successfully integration the NVG with the aircraft cockpit for optimum system performance. |
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| Night Vision Devices and Characteristics |
1992 |
13 pages |
| Authors:
H. L. Task; ARMSTRONG LAB WRIGHT-PATTERSON AFB OH CREW SYSTEMS DIRECTORATE
|
| Night vision goggles (NVGs) are widely used to enhance visual capability during night operations. NVGs are basically composed of an objective lens which focuses an image onto the photo-cathode of an image intensifier tube which in turn produces an amplified image that is viewed through an eyepiece lens. There are several versions of NVGs in use and in development. These include the AN/PVS-5,AN/AVS-6, PVS-7, Cat's Eyes, Nite-Op, Eagle Eyes, Merlin, ... |
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| The Effect of Signal-to-Noise Ratio on Visual Acuity Through Night Vision Goggles |
FEB 91 |
30 pages |
| Authors:
Joseph T. Riegler; James D. Whiteley; H. L. Task; James C. Schueren; LOGICON TECHNICAL SERVICES INC DAYTON OH
|
| Since 1971, night vision goggles (NVGs) have been used by the military to enable personnel to perform visual operations in a nighttime environment. The key component of these devices is the image intensifier tube. Currently, no studies were identified which relate the signal-to-noise ratio (SNR) of image intensifiers to human visual acuity. The purpose of the present research was to determine the effect of NVG intensifier tube SNR on visual ... |
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| Flexible Fiber Optics Bundle Study. Effect of Number of Active Fibers on Symbol Legibility |
MAR 87 |
|
| Authors:
William N. Kama; John Bridenbaugh; H. L. Task; HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT- PATTERSON AFB OH
|
 | To assess and evaluate the utility of Flexible Fiber Optics Bundles (FFOB) as image transmitters, a study was performed to determine what effect the number of active fibers across a given symbolic character would have on the legibility of the character. Twelve subjects performed a symbol identification task in which the symbols were displayed through either a rectangular or a hexagonal format FFOB. The symbols viewed varied in terms of ... |
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| The Measurement of Aircraft Windscreen Haze and Its Effect on Visual Performance |
FEB 85 |
46 pages |
| Authors:
H. L. Task; L. V. Genco; AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| A new method of measuring haze in installed aircraft transparencies is developed and explained. Using data obtained with the new method, equations were derived to help predict target detection performance as it is affected by windscreen haze, windscreen transmissivity, ambient illumination, mean target luminance, target contrast and target size. The equations may be applied to many transparency types and configurations. Graphs are provided to show the effects of another of ... |
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| Removable Cleanable Antireflection Shield. |
10 JAN 1985 |
|
| Authors:
H. L. Task; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A replaceable anti-reflection shield for the glare surface beneath the windscreen an aircraft is described which comprises a flexible panel of light absorbing material, such as black cloth, velvet, canvas or plastic, of size and configuration corresponding to that of the glare surface for placement on and conformance to the contour of the glare surface beneath the windscreen, and peripheral attaching means such as adhesive strips, snaps. Velcro strips, suction ... |
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| Method for Dynamically Recording Distortion in a Transparency. |
24 JUL 1984 |
|
| Authors:
H. L. Task; L. V. Genco; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A method for dynamically recording distortion in a transparency includes a support fixture for mounting the transparency for movement about a predetermined horizontal or vertical axis, with a camera disposed in back of the transparency while a test target is disposed in front of it. The test target has a plurality of small light sources arranged in a rectangular matrix pattern toward which the camera is aimed through the transparency. ... |
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| Method of Measuring Optical Properties of a Transparency. |
04 MAY 1984 |
|
| Authors:
L. V. Genco; H. L. Task; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A method of measuring optical properties of a transparency uses a video camera for focusing and then refocusing an image of a point source of light transmitted through a test region when the transparency is first absent and then later present at the test region. The distance the camera needs to be moved together with the focal length of a focusing lens used in carrying out the method provide sufficient ... |
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| Portable Visual Function Tester. |
11 APR 1984 |
|
| Authors:
H. L. Task; L. V. Genco; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A novel portable visual function tester and reliable testing method is described for the rapid and accurate measurement of several parameters of human vision, including critical fusion frequency, stereopsis. The visual display patterns may comprise light emitting diodes: the electronics of the system may include an audio recorder for recording the selected vision parameter measurement and the observations using the system, and may be battery powered for portability. |
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| Testing Changes in Visual Function Due to Orbital Environment |
JAN 1984 |
|
| Authors:
L. V. Genco; H. L. Task; AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| The effects of weightlessness and other space environmental conditions on vision have received little attention since the visual acuity experiments performance by Dr. Duntley, circa 1968. Although several subsequent investigators have attempted to construct vision testers suitable for use in space, none was fully successful until the production of the device described in this report. The report describes a device submitted by the AF Aerospace Medical Research Laboratory for inclusion ... |
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| Optical and Human Performance Evaluation of HUD (Head-Up Display) Systems Design |
15 DEC 1983 |
|
| Authors:
W. L. Martin; R. D. Lee; A. P. Ginsburg; L. V. Genco; H. L. Task; AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| Eight technical papers, each by a different author, cover several aspects of head-up display (HUD) technology, emphasizing the state-of-the-art and test and evaluation of HUD systems. Authors represent several specialists and laboratories. The papers, by number, cover: (1) An overview of HUD optical design (optics), (2) Measurement of HUD optical quality (optical engineering), (3) Optical interactions of aircraft windscreens producing diplopia (physiological optics), (4) Sun/moon capture evaluation (optics), (5) Contrast ... |
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| Measurement of HUD (Head-Up Display) Optical Quality, |
15 DEC 1983 |
|
| Authors:
H. L. Task; AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| This section describes the optical quality measurement procedures that were adopted to evaluate the LANTIRN HUD. The objective of these measurements was to determine how suitable the HUD optics were for matching human visual requirements. The measurements were directed to the optical components and did not include the cathode-ray tube (CRT) and symbology generation quality. Measurements fell into two broad categories, those that characterized visual quality viewing through the combiner ... |
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| Optical Effects of F-16 Canopy-HUD (Head Up Display) Integration, |
DEC 1983 |
|
| Authors:
H. L. Task; AIR FORCE AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OH
|
| The F-16 heads-up display (HUD) provides the pilot with visual information in symbology form that is overlayed on the outside world scene in the forward viewing direction. This super-position of HUD symbology and outside world scene is done by using an optical combiner (beamsplitter) which is part of the HUD optical system. One of the critical items of information that is displayed on the HUD is the aiming reticle that ... |
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| Semi- Two-Dimensional Decoys. |
01 NOV 1983 |
|
| Authors:
H. L. Task; M. B. Tutin; G. R. Bothe; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| A novel decoy providing the deceptive appearance of a genuine three-dimensional object, such as vehicle, is described which comprises a plurality of modular table units each of predetermined shape and assembled in an abutting relationship to form an outline of the vehicle, each said table unit supported by a framework including leg elements in a spaced relationship above the ground whereby a shadow is cast in said outline, to further ... |
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| Helmet Mounted Telescope. |
15 NOV 1982 |
|
| Authors:
H. L. Task; C. Bates Jr; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| An improved helmet is provided including means to telescopically acquire an image of a field of view, which comprises, a telescopic optical system including an objective lens mounted to said helmet above the line of sight of the wearer, a light-conducting fiber optics bundle mounted to said helmet for receiving the image from the objective lens, and collimating lens for receiving the image from the fiber optics bundle and projecting ... |
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| A New Measure of Television Display Quality Relatable to Observer Performance. |
AUG 1976 |
|
| Authors:
H. L. Task; R. W. Verona; AEROSPACE MEDICAL RESEARCH LAB WRIGHT-PATTERSON AFB OHIO
|
| This report describes a new, direct measurement method of determining the imaging quality of cathode-ray tube (CRT), line scan displays. This measurement was specifically developed as a more critical and realistic indicator of display quality. The measurement consists of recording the modulation contrast available on the display as a function of spatial frequency. An electronic sine wave generator produces a sine wave intensity pattern of the face of a CRT ... |
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Reports by Author
