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ATEX and IEC Ex Flame-proof Explosion Proof Lighting & Equipment
Explosion Proof Lights
Explosion Proof Motors - Motors for Hazardous Locations
Industrial and Vaporproof Emergency Failsafe Lighting
Industrial Cord Reels and Tool Taps
Industrial Work Area Heaters
Machine Vision Lights
Megatower™
QC Series Industrial Portable Lighting - Quick Change Mount
Rig Lights
Stadium lights
String Lights and Temporary Light Stringers
Tank Cleaning Lights
Three Phase Motor Soft Starters
Vapor Proof LED Lights
Variable Frequency Drives (VFDs)
Vehicle Mounting Plates
Workboat Light Fixtures & Lighting Equipment
Yacht Engine Room Lights
Color Changing LED RGB Lighting
Explosion Proof Cord Reels
GOLIGHT Spotlights
Larson FUTURE - Lease Lighting
Remote Area Lighting and Scene Lights
Utility Bucket Mount, Receiver Hitch & Trailer Mount Lighting
Aevum Control Lighting and Equipment - IIoT
Butane and Solvent Extraction Room Lighting and Equipment
DC to DC Transformers and Power Supplies
Explosion Proof Fans & Blowers
Explosion Proof Paint Spray Booth Approved Lights
Explosion Proof String Lights
Explosion Proof Switchgear & Controls
Fleet Service Lights and Lighting Equipment
Industrial Equipment Trailers
Industrial Handlamps & Droplights
ISO 14644/FS-209E Clean Room Lighting
LED Blasting Lights
Night Time Fishing Lights
Portable AC Power Supply Units
Portable Power Distribution Panels
Power Distribution Panels with KVA Transformers
Self-Contained Lighting
Service Pit Lighting
Solar Generators & Solar Powered Lighting
Agricultural Farm Equipment Lighting & Beacons
Explosion Proof Cameras & Surveillance Systems
Explosion Proof Emergency Lights
Explosion Proof Heaters
Garage & Gas Station Canopy Lights
LED Grow Lights
LED Lights
NDT Ultraviolet Lights
Portable Hazardous Location Lighting
Radio Communication Towers and Equipment
Salt Water Processing Equipment
Shelter & Tent Lighting
Thermal Monitoring Cameras and Systems
48V LED Equipment Lights
ATEX Rated Explosion Proof Lights
Automotive Lighting
Class Rated Signals, Alarms, and Systems
Hazardous Location Area Lights and Portable Lighting
HID Equipment Lights
Hot Work Permit Lighting and Equipment
Hunting Lights
Industrial lasers
Industrial Transformers
Light Towers
Outdoor Lighting
Remote Security and Surveillance Systems
Temporary Construction Lights
Vehicle Mounted Spotlights
Equipment & Heavy Machinery LED Light Package Fitouts
Phase Converters - Single to Three Phase
Marine Shore Power Cords and Equipment
24 Volt Military Lights
Disaster Relief / First Responders / Search & Rescue Lighting
Plastic Handcuff Key
110/120 Volt Flood Lights
Post Mount Spotlights
Magnetic Work Lights
Crank-up Light Masts
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Intrinsically Safe Lights
Military Flashlights
LED Waterproof Lanterns
Work Area Lights
12 Volt Flood Lights
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Boat Spotlights
New Boat Lights
HID Boat Lights
Boat Dock Lights
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Remote Control Lights
Control Lights
Tow Lights
Magnetic Control Lights
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NEW Lights and New Products
Evaporative Coolers
Police Equipment
AC/DC Transformers
Power Supplies
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Military Spotlights 24V
Infrared Filters, Covert Covers, and Blackout IR Lenses
Military Equipment
Ultralife Batteries
Remote Control Pan Tilt Base
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Larson Electronics Spotlights
Larson Electronics Parts
Replacement Lamps
Cords - Brackets
Portable Wheeled Generators
Non-Hazardous Location Extension Cords / Plugs / Outlets
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HID Work Lights
HID Dive Lights
HID Off Road Lights
Acro Lights HID Lights
Halogen Lights
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Acro Light Flashlight
Xenon HID Flashlights
Powerlight Flashlight
HID Flashlights
Xenon Flashlights
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LED Status Lights
Forklift Lights
Tractor Lights
HID Post Mount Lights
Roof Mount Lights
Post Mount Light parts
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Flashlight Holder
Magnet Spotlight Base
Tripods-Magnetic Base
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Recharging Spotlights
Fire Rescue Lights
LED Street Lights
Utility Lights
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Hazard Lights
Strobe Lights - Battery Operated
Strobes & Beacons
Strobe Light Bars
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Headlights - Headlamps - Hard Hat Lights
Flashlights
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Suction Mount Lights
Magnetic Spotlights
12/24 Volt Spotlights
Gifts For Men
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New 12 / 24 Volt Lights
Explosion Proof Accessories and Replacement Parts
Explosion Proof Lighting
Explosion Proof Hand Lamps (Drop Lights)
Explosion Proof Lights - Stand/Dolly
Explosion Proof Tank Lights
Explosion Proof Phones and Intercoms
Explosion Proof Extension Cords
Black Friday & Cyber Monday Specials
Crane Lights
Explosion Proof Light Rentals
General Light Rentals
Light Tower and Light Plant Rentals
Power Distribution Rentals
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Power Plant Lighting
Refinery lights
Environmental Services Lights
Aerospace Lights
Chemical Plant Lights
Food Grade Safe Lights
Film and Entertainment Lights
Handheld Meters and Devices
Waste Water Treatment Lights
Mining Lights
Ship Yard Lights
Work Site Lighting
         

   
11/28/10 Light Amplification vs Thermal Imaging

There are only two major types of night vision technology that have proven themselves both effective and practical for regular use; light amplification and thermal imaging. Although both offer a once unheard of ability to literally see in almost total darkness, how they manage this feat is accomplished in two totally different ways. It’s these fundamental differences in method that are also responsible for the benefits and drawbacks which each type of night vision technology represents.

The first true night vision devices appeared during World War 2 and were crude and primitive by today’s technological standards. These devices relied almost entirely on what is known as active infrared imaging to allow users to see enemy combatants during nighttime missions. Active infrared imaging is when a device uses an infrared light source or projector to create light in the infrared spectrum which is then directed at the object to be viewed. Although this infrared light is invisible to the human eye, it still behaves like regular light and is reflected off of any objects it is shown on. This infrared light then reflects back at the device which receives it through a lens, much like a camera. The infrared light passes through cathodes and anodes within the device and is ultimately processed into an image which is viewed through an eyepiece or on a small screen.

This type of technology quickly progressed and in a short period of time passive infrared technology appeared and greatly improved low light imaging abilities. Passive infrared technology makes use of whatever light is available, starlight, moonlight, ambient light from other sources, and amplifies it thousands of times. This allows night vision devices to be used without the need for an infrared emitter to provide a light source. This type of technology has gone through several stages, with each successive improvement designated as a generation of night vision technology. This is why you will almost always hear references to 1st, 2nd, 3rd, or 4th generation when night vision devices are being discussed. Each successive generation represents a large improvement over the former in matters of resolution and sensitivity.

As you can imagine, first generation night vision equipment produces the least resolution and detail, while 4th generation equipment provides the best. As you can also imagine, 4th generation is also the most expensive and is at this time still priced well beyond what the casual user would be able to spend. In fact, 4th generation night vision is still a federally controlled technology and not readily available to the public. Because of this pricing and availability, 1st and second generation night vision is the most commonly utilized technology. What is important to note here, however, is that all types of night vision technology that relies on light amplification can benefit from an added infrared light source because these devices amplify light from the invisible lower infrared end of the light spectrum as well as from the visible portion. This type of technology has as one of its greatest benefits the ability to produce images that are clearly defined, and represent a truer appearance of any objects viewed despite a lack of true color rendering. With this kind of device, you will be able to identify a person, a weapon, or even the wording on a sign in near total darkness. This kind of capability is what has made active and passive infrared technology the dominant form of night vision in the law enforcement and security industries.

Thermal imaging works on a different principal than light amplification and relies on infrared radiation emitted as heat by objects to produce an image. Thermal imaging devices sense the temperatures in a given area and note any differences, then use the contrasts produced to form an image which is then displayed on a screen. This type of technology is very effective in providing an image regardless of whether any kind of light is present as well as being able to identify objects under inclement conditions such as fog or rain. Objects viewed by thermal imaging appear true to their general shapes and forms, and in some variations of thermal imaging devices, colors are introduced which further improves the ability to discern between objects. Thermal imaging is very effective when used in targeting and locating concealed or obscured objects or people and is seeing widespread use in military and law enforcement applications as a result. It does not matter if an object is obscured by brush or fog, a thermal imager will reveal its presence and location. One of the factors that severely limit thermal imaging’s effectiveness, however, is its lack of detail and resolution. Since thermal imaging devices rely on a contrast in temperatures, the coolest objects appear dark and the hottest objects appear very bright. This results in images where the clothes of a person being viewed may appear gray, while their head or any exposed skin will appear white. Even in devices where sensitivity is at its maximum and artificial color has been introduced, there is still too little resolution to make an effective determination as to a person’s identity.

All of these factors and more relate to the effectiveness of one night vision technology’s superiority over another. Although both have their drawbacks and advantages, for sensitive and critical applications where positive identification is mandatory, only light amplification technology has this capability. When light amplification technology of any generation is paired with an infrared illuminator like the Larson Electronics IR LED Light Bar, an unparalleled ability to produce high resolution images in the absence of visible light is created that allows the user to not only locate and monitor a subject in total darkness, but make a positive identification as well. Since the IR illumination produced by an emitter is invisible to the human eye without the proper equipment to view it, this is an excellent way for those engaged in covert operations to monitor and identify subjects while remaining undetected. Light emitters also greatly improve the ability to use light amplification devices under conditions that would normally prohibit their use, such as cloudy or moonless nights, or in enclosed buildings where no ambient light is present.

 The ability to make a definitive identification is perhaps the most crucial aspect of many military and law enforcement covert operations. Not all activities involve combat, but many combat missions rely on solid and reputable intelligence data in order to avoid unnecessary casualties, while law enforcement applications benefit from the ability to insure that who or what they are observing is indeed their intended target. Until thermal imaging technology catches up and is able to produce images of high resolution and detail, light amplification night vision and infrared illumination will remain the only technology that truly allows us to literally see in the dark.

 





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