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Night Phase > NVG > Flashcards

NVG Flashcards

1
Q

NVG Characteristics

A

D - Definition
I - Intensification (2000 to 3000x Zero Magnification)
A - Acuity (20/25 best to 20/70 Worst)
L - Limited field of view (40’ FOV)
V - voltage low indicator (approx. 30 min remaining)
P - power supply (AA Alkaline or Lithium, no mixing)

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2
Q

NVG Considerations

A 
C - Color Discrimination
A - Air/Ground Speed Limits
L - Lights and Lighting
M - Magnification
W - Weather
W - Weapons
A - Aircraft Lighting
D - Depth Perception and Distance Estimation
S - Scanning Techniques
O - Obstruction Detection
S - Spatial Disorientation
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3
Q

NVG Definition

A

a passive light amplification/intensification system that amplifies light and provides sufficient imagery for pilotage from overcast starlight to moonlight considerations

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4
Q

NVG Visual Deficiencies Operational Defects

A

S - Shading
E - Edge Glow
E - Emission Points
F - Flashing/Flickering or Intermittent Operation

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5
Q

NVG Visual Deficiencies Cosmetic Blemishes

A 
B - Bright Spots
I - Image Distortion 
B - Black Spots
I - Image Disparity
C - Chicken Wire
F - Fixed Pattern Noise (Honeycomb)
O - Output Brightness Variation
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6
Q

NVG Consideration - Lights and Lighting

A

P - Performance Relations
E - Effects of Bright Lights
A - Automatic Brightness Control
B - Bright Source Protection

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7
Q

NVG Considerations - Depth Perception and Distance Estimation

A

D - Degree
A - Acuity
T - Type
E - Experience

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8
Q

Visual Illusions

A

H - Height-Depth Perception (loss of visual cues)
A - Autokinesis (single light appears to move)
V - Vection (Induced Motion Illusion)
F - False Horizons (sloping cloud deck/terrain,reduced vis)
F - Fascination/Fixation (task saturation, target fixation)
C - Crater Illusion (IR down, think you’re higher)
C - Confusion w/Ground Lights (w/stars)
S - Structural Illusion (precipitation, heat waves)
S - Size Distance Illusion (comparing unfamiliar size w/familiar)
A - Aerial Perspective (cues diff size or perspicuity than expected)
S - Size Constancy (wider-hi/long, narrower-lo/short)
S - Shape Constancy (down slope-hi, up slope-low)

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9
Q

Night Vision Techniques

A

S - Scanning
O - Off Center Vision
S - Shapes & Silhouettes

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10
Q

NVG Protection - Protective Equipment

A

R - Red Lighting / Red Lens Goggles
S - Supplemental Oxygen
S - Sunglasses

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11
Q

NVG Protection - Protective Measures

A

C - Cockpit Lighting
E - Exterior Lighting
L - Light Flash Compensation

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12
Q

NVG Protection - Light Flash Compensation

A

C - Close One Eye
A - Alter Course
A - Automatic Weapons Fire (short burst)
T - Turn away from lights

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13
Q

Night central blind spot

A

central or night blind spot
scotopic vision
peripheral vision

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14
Q

Dark Adaptation

A 
D - Definition
S - Starting Level
S - Sensitivity
T - Time to Adapt (30 to 45 min)
T - Time to Readapt (Several to 45 minutes or longer depending on brightness, duration or after repeated exposures) (2-3 min after removing goggles)
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15
Q

Distance Estimation & Depth Perception

A 
Binocular Vision
Monocular Vision
   G - Geometric Perspective
       L - Linear Perspective
       A - Apparent Foreshortening
       V - Vertical Position in the Field
  R - Retinal Image Size
      K - Known Size of Objects
      I - Increasing/Decreasing Size
      T - Terrestrial Association
      O - Overlapping Contours
  A - Aerial Perspective
       F - Fading of Color or Shades
       L - Loss of Detail or Texture
       L - Light Source Position / Shadow Direction
  M - Motion Parallax
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16
Q

Day Blind Spot

A

5.5 - 7.5 wide, located about 15 degrees from the fovea
No cones or rods, are present at the attachment point
compensated for by Binocular Vision
Day blind spot is always present

17
Q

NT Central Blind Spot

A

Central or Night Blind Spot
Fovea inactive (concentration of cones)
5-10 degrees wide
Objects fade away if stared at > 2 sec
Blind spot size increases with distance
Scotopic Vision
Peripheral Vision

18
Q

Types of Vision

A

Photopic
Mesopic
Scotopic

19
Q

Height - Depth Perception

A

are due to absent or insufficient visual cues and cause crew members to misjudge depth perception

20
Q

Autokineses

A

when ambient visual cues are minimal and a small, dim light is seen against a dark background

21
Q

Vection

A

induced motion is falsely perceived motion of oneself when no physical motion is actually occurring. ex: visually induced perception of self-motion.

22
Q

False Horizon

A

when a pilot confuses a wide sloping plane of reference such as sloping cloud tops, mountain ridges, or so called cultural lighting at night with the true horizontal

23
Q

Fascination / Fixation

A

can be separated into two categories
-task saturation - when crew members become engrossed with a problem or task within the cockpit that they fail to properly scan outside the aircraft

-target fixation - when crew members ignore orientation cues and focus their attention on an object or goal

24
Q

Crater Illusion

A

when crew members land at night under night vision device conditions and the infrared searchlight is directed too far under the aircraft’s nose

25
Q

Confusion w/Ground Lights

A

pilot mistakes ground lights for stars.

26
Q

Structural Illusion

A

caused by the effects of rain, snow, sleet, heat waves, or other visual obscurants

27
Q

Size - Distance Illusion

A

crew member misinterprets an object of unfamiliar size and shape by comparing it with what they are accustomed or familiar to seeing based on experience

28
Q

Aerial Perspective

A

can occur if visual cues are of a different size or perspicuity than expected

29
Q

Size Constancy

A

a runway that is narrower than expected may cause the pilot to think he or she is higher and further away resulting in the flying of the approach too low and land short

30
Q

Shape Constancy

A

than up sloping runway may give the pilot the illusion of being too high. and vise versa

Night Phase (1 decks)

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