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NR > Night Systems > Flashcards

Night Systems Flashcards

1
Q

NVG Field of View

A

40 degrees

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2
Q

4 main components of NVGs

A

Objective LensImage Intensifier TubesEyepiece LensPosition Adjustment Shelf

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3
Q

Objective Lens

A

Focuses incoming rays of light on the image intensifier tubes

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4
Q

Focal Range of Objective lens

A

25mm to infinity

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5
Q

3 components of Image intensifier tubes

A

PhotocathodeMicro channel Plate (MCP)Phosphor Screen

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6
Q

Photocathode

A

Converts incoming visible light and near IR energy into electrical energy in the form of electrons.

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7
Q

Micro-Channel Plate (MCP)

A

Multiplies electrons from the photocathode so that for each electron that enters the MCP, thousands exit

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8
Q

Phosphor screen

A

Converts electron beam energy into light

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9
Q

Eyepiece Lens

A

Focuses light from the phosphor screen onto the eye

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10
Q

Diopter Adjustment

A

Located on the eyepiece lenses. Allows the user to move the focus point to the appropriate location on the back of the retina

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11
Q

Position adjustment shelf

A

Holds the 2 NVG tubes and has the connection point for the helmet shelf

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12
Q

Collimation

A

The process by which NVGs take 2 separate pictures from each monocular and align them for viewing

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13
Q

Results of improper collimation

A

Oblong field of view2 separate pictures Shadowing on the edges of the field of view

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14
Q

Effects of Improper Collimation on the User

A

Eye fatigue and Eye strain

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15
Q

How should interpupillary distance be adjusted

A

Initially set at 60, then adjust each monocular individually to center in front of each eye

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16
Q

Effects of incorrect interpupillary distance

A

Outside edges blurred - Monoculars too far apartInside edges blurred - Monoculars too far apart

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17
Q

How should eye relief be adjusted

A

25mm from the eye

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18
Q

Effects of improper eye relief

A

Too close - Impaired look under scanToo far - field of view is decreased

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19
Q

How should tilt be adjusted

A

So that optical axes of binoculars is perfectly aligned with the eyes

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20
Q

How should NVGs be vertically adjusted

A

To be placed directly in front of the eyes

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21
Q

NVG focusing procedure

A
  1. Preset Diopter at 02. Cover the tube3. Adjust objective lens (outer) until lines on coarse grid come into focus4. Turn diopter (inner) CCW until image is blurred, pause 2 seconds to allow the eyes to relax then turn CW until image comes into sharp focus5. Fine tune with the objective lens (outer) to bring as many grids into focus
22
Q

Shading

A

Dark area along the edge of the image

23
Q

Possible adjustments to fix shading

A

adjust tilt, IPD, or vertical

24
Q

What damage can cause shading

A

failing photocathode caused by a defective vacuum seal on the image intensifier tube

25
Q

Edge Glow

A

Bright area along the outer edge of the image

26
Q

Causes of edge glow

A

incompatible light source in goggles FOV. Can alleviate by cupping hand around objective lens

27
Q

Bright or dark spots

A

Caused by turning NVGs on in bright room or subjecting them to laser damage

28
Q

Honeycomb pattern

A

Normal during times of very high luminance. During normal luminance indicates damaged NVGs

29
Q

Causes of Image Flickering

A

Impending failure of the tubeFaulty wiringImpending battery failure

30
Q

Veiling glare

A

Decreased contrast causing haze across entire image

31
Q

Causes of veiling glare

A

Excessive scratches, pits chips in objective lensIncompatible lighting

32
Q

Scintillation

A

Sparkling of image caused by low light levels where resolution is limited by internal noise

33
Q

HUD Velocity Vector

A

Shows known drift from the reference pointFull scale displacement indicates 76 ft/sec (45 knots) on the cruise layer and 25.3 ft/sec (15 knots) on the hover layer

34
Q

HUD nacelle angle indicator tick mark locations

A

0, 30, 60, 75, 90, and 97.5 degrees

35
Q

What does a solid box around the HUD Qm reading mean

A

Average Qm exceeds limits that would cause MFD Qm box to turn yellow or red

36
Q

What does a solid box around the RADALT reading on the HUD mean?

A

You have descended below the RADALT Low set point

37
Q

HUD VVI scale

A

Cruise: +/-2000ft in 200 fpm incrementsHover: +/-1000ft in 100 fpm increments

38
Q

HUD Velocity vector tick mark meanings

A

5, 10, and 15 knotsDistance to Waypoint: 0.05, 0.1, and 0.15 nm

39
Q

SLAP Solar/Lunar Daily Illumination Graphs

A

Shows solar/lunar illuminance vs. time for a 24 hour period with 4 values displayed:1. Clear to scattered (100% illuminance)2. Partly cloudy (50% illuminance)3. Mostly cloudy (33% illuminance)4. Dark overcast (10% illuminance)

40
Q

BMCT

A

Begin Morning Civil Twilight - Begins when center of the sun is 6 degrees below the horizon in east

41
Q

EECT

A

End Evening Civil Twilight - When center of the sun is 6 degrees below the horizon in the west

42
Q

BMNT

A

Begin Morning Nautical Twilight - when the center of the rising sun is 12 degrees below the horizon. Illuminance levels once the sun passes 12 degrees are not compatible with NVG operations

43
Q

EENT

A

End Evening Nautical Twilight - When center of the setting sun is 12 degrees below the horizon. Once this occurs illuminance levels are compatible with NVG operations

44
Q

Solar Twilight

A

When the sun’s elevation is between -18 and 0 degrees

45
Q

Lunar Twilight

A

When the moon’s elevation is between -18 and 0 degrees

46
Q

Percent Lunar Illumination

A

Percent of the lunar disk illuminated, computed at midnight on each day.

47
Q

Solar/Lunar Azimuth

A

Azimuth position of the sun/moon in degrees clockwise relative north from the targets perspective

48
Q

Solar/Lunar Elevation

A

Elevation angle of the sun/moon relative to the horizon

49
Q

Indications that you may be entering into IIMC when using the NVGs

A

Increased Halo EffectDegraded NVG imageObscuration of the moon and starsIncreased image scintillationLoss of ground lights

50
Q

Low light level

A

less than 0.0022 lux

NR (20 decks)

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