Glossary of Terms - Southern Hog Control 


· 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.