· Automatic Brightness Control: Electronic feature that automatically reduces voltage to the micro-channel plate.Maintains image brightness within optimal margins and protects the tube. The effect can be seen with rapid change in lighting.
· Auto-Gated Power Supply: Systematical turning on and off at a fast rate to reduce blooming effect on night vision devices and thermal optics.
· Black Spots: Dirt or other blemish in the image intensifier, possibly between the night vision lenses.
· Bright Spots: Defects caused by flaws in the micro-channel plate that adversely affect the image displayed by electro optic devices.
· Biocular: Viewing a single image source with both eyes.
· Binocular: Viewing an image through two channels, one per each eye.
· Blooming: Loss of thermal night vision due to overloading of bright light, also known as the halo or white out effect.
· Bright Source Protection: Reduction in voltage to the photo-cathode when the night vision device is exposed to bright light sources.
· Boresighting: Alignment of the scope to the bore of the weapon.
· COMSPEC: Commercial specifications used to define night vision image tube quality, testing and inspection by L3 or SureFire manufacturer.
· Chicken Wire: Irregular pattern of dark lines in the night vision field of view.
· Daylight Training Filter: Glass filter assembly designed to fit over the objective lens of a night vision device filtering light input to a safe level.
· Diopter: Measurement of eye correction or refractive power on a lens adjusted to individual eyesight.
· Distortion: Grainy effect in the night vision device caused by manufacturing flaws in the intensifier tube and fiber optics.
· Equivalent Background Illumination: Amount of light seen through a night vision device when image tube has no light present on the photo-cathode.
· Edge Glow: Glowing in the perimeter of an image area of night vision device.
· Emission Point: Fluctuating pinpoint of bright light in the image area that does not go away when all light is blocked from the objective lens.
· Eye Relief: Distance between eye and rifle scope to achieve the optimal image.
· Field-of-View: Width of the terrain image when viewed through a riflescope.
· Figure of Merit: Image intensification calculated by millimeter signal to noise.
· Fixed-Pattern Noise: Honeycomb pattern throughout the image and inherent in the structure of the micro-channel plate of the night vision rifle scope or monoculars.
· Footlambert: Unit of brightness equal to one candle at one foot distance.
· Gain: The factor by which a night vision device amplifies light input.
· Halo: Circular region around a bright light that appears brighter due to elastic collisions of electrons on the MCP surface.
· Highlight Shutoff: Image intensifier protection feature incorporating a sensor, microprocessor and circuit breaker. This feature will turn the system off during periods of extreme bright light conditions.
· Inter-Pupillary Adjustment: The adjustment for the space between the two eyepieces of binocular optics to accommodate individual differences.
· Infrared Illuminator: Built-in infrared diode that emits invisible light providing supplemental illumination in a night vision device.
· Infrared: Illumination below the visible spectrum. It cannot be seen by human eye.
· ITAR (International Traffic in Arms Regulations): US Government regulatory agency controlling the export of defense-related materials, articles, and services on the United States Munitions List.
· LED: Electronic light source based on semiconductor diode when forward biased, the electrons recombine with holes releasing energy in the form of light called electro-luminescence.
· Light Lens Cover: Allows marginal amounts of light on to the lens of a night vision device usually for training purposes only.
· Lumen: Photons visible to the human eye in one second.
· Monocular: Single eyepiece optical device.
· Mil Spec: Stringent and exacting specifications required by the US military
· Micro-Channel Plate: Metal coated glass disk that multiplies the electrons produced by the photo-cathode and eliminates distortion.
· Microwatt: One-millionth of a watt, a derived unit of power.
· Mil-Dots: Reticle designed for miliradian unit of measurement and allows hunter to accurately estimate range using a thermal night vision rifle scope or monoculars.
· Miliradian: Unit of measurement to determine laser divergence, one unit is equal to 0.001 radian with a deviance of 1-meter per 1000-meters.
· Milliwatt: Unit of measurement equal to one thousandth of a watt.
· Minute Of Angle: Rifle scope point of reference, 1.047" per 100-yards.
· Nanometer: Unit measurement of length, one-billionth of a meter.
· Near-Infrared: Short wavelengths of infrared, nominal 750 to 2500 nanometer.
· National Stock Number: 13-digit code for standardized items, such as thermal night vision rifle scopes and thermal optic monoculars and recognized by the US Department of Defense.
· Photocathode: Surface input for image intensifier tube which absorbs light energy photons and releases electrical energy electrons resulting in the image.
· Photocathode Sensitivity: Measures intensifier tube light conversion and transmits an electronic for amplification.
· Picatinny Rail Mount: Series of ridges with t-shaped cross-sections used as standard attachment method for tactical weapons in the US Military.
· Resolution: Ability of the image intensifier, or night vision rifle scope or thermal optic monocular, to distinguish between objects close together.
· Reticle Pattern: Adjustable scope or monocular aiming point inside the optical weapon commonly referred to as the "crosshairs".
· Signal-to-Noise Ratio: Measurement of the light signal reaching the eye divided by the measured extraneous light.
· Scintillation: Random sparkling effect throughout the scope or monocular image area such as scintillation of the micro-channel plate image intensifier.
· Screen: Image tube output that produces the image for viewing.
· Stereoscopic Night Vision: Multiple view image produced by one device that represent both the left and right eye viewpoint.
· System Gain: Equal to tube gain minus losses induced by system components such as lenses, laser splitting and filtration.
· Variable Gain Control: Manually adjusting the gain in varying light conditions, an L3 feature in the thermal optic monoculars and night vision rifle scopes.
· Watt: Derived unit of power measuring energy conversion in International System of Units, 1-watt is equal to 1-joule of energy, per second.
· Weaver Mounting System: US weapon mounting system used for attaching sighting devices to weapons.
· Zeroing: Method of adjusting crosshairs to compensate for projectile characteristics at known distances.