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Devices for night vision
Welcome to this
online presentation of night vision equipment. By going through the banner or product links you can read more about or buy the presented products or find many more products of the kind. Further down on this page you find presentations of good sources of hobby products and car equipment. You will also find some information about the principles of night time viewing equipment.
Please click here to find day-time binoculars, rangefinders and binoculars with inbuilt camera.
Good places to find night time vision equipment, optical instruments and a lot of other items - These are general stores with all kind of equipment for good prices, among those also binoculars and night vision devices. You can also find other highly sophisticated optical instruments or tools for a good prize. Most of the products presented at this page are from one of these stores.
AND PROFESSIONAL ITEMS OF MANY KIND
Trend times toys - This is a great collection of all types of radio controlled models and other hobby products. The store is specially strong at high performance nitro driven models.
Xenon Project - - This store specializes in remote controle models of all types of vehicles to use on ground, in air or in water, driven by electriciy or by nitromethane fuel.
Special store for redcat rising car models - These are speedy car models for for racing bot at roads and offroadd. Nitro driven redcats: Hurricane XP PRO, Monsoon XP, Avalamche XP, Tornado BP, Tsunami, Tsunami ultrawide, Volcano SV SV Pro, Tremor ATV XTB XtG XTK XTR. Electric redcats: Lightning XTK, Tornado EPX, Tsunami EPX, Volcano EPXr.
Autoparts Warehouse - Through the banner below you will find all types of techical parts for mending your car, styling your car, or increase the power of your car: Motor, transmission, lights, brakes, fuel system, exhaust systems, locks, electric parts, etc.
Autobarn - By clicking at this banner, you will find a huge collection of commodities for your car or to bring with you on your journeys, like electronic equipment, luggage bags, security items, navigation units, workshop tools and a lot more. Also technical equipment.
Kalyx - This banner brings you into a superstore where you can find a lot of tools of any kind for car works, navigation equipment and other vehicle electronics. You can also find a huge variety of other types of products, like houshold comodities, garden tools, herbs and herbal preparation.
PRINCIPLES OF NIGHT VISION
It is not really dark in the night. Every thing that has a temperature, will emanate light. If the temperature is high enough, visible light will be the result. Things having only room temperature or outside temperature, emanate light with longer wavelength and less frequency, called infrared light.
The infrared light can be catched by devices with the right type of optics. It can then be converted to visible light with several kinds of measures.
In the night there will also be some visible light left. Also this visible light can be captured by lense systems and consentrated to give a picture that is well visible for a person.
Night vision devices both capture and concentrate present small amounts of visible light, catches infrared light and convert it to something visible and also often illuminate the site viewed with infrared illuminators.
Night vision by visible light
There is nearly never a complete absence of visible light. There is nearly allways some light that can be amplified to make a good view also during night.
By using wide lenses in the objective of a binocular or viewing device, enough light can be concentrated towards the ocular lenses and onto the eyes of the viewer to make good in vision in near darkness. Using very wide lenses is however not allways practical, especially not in googles that must have a small size and be easy to wear. The light intesity of the picture must therefore also be amplified in some way. This is done by an image intesifier.
The image intensifier have a detector plate and a screen in a short distance from each other. The detector plate consists of a material that emits electrons when hit by light. The screen is covered by some chemicals that emit light when hit by electrons, for ecxample phosphor. There is some material between the plate and the screen that have the ability to emit even more electrons when hit by an electron, and there is an electric potensial between the plate and the screen.
When light falls on the detector plate, a few electrons are ejected. Electrons sent out will then be drown towards the screen by the electric potensial, and in their way, they will cause a cascade of electrons to be ejected. All these electrons are then accelearted towards the screen. When they hit the screen, light will be sent out againt from the screen. This light will be stronger that that fallen onto the detector plate. Thus an image can be seen on the screen.
Night vision by infrared radiation and illumination
Infrared radiation or infrared light lies near up to visible light in the electromagnetic radiation scale, having a wavelength of 750 - 30000 nm, or using another length measure from 0.75 - 30 microns or billionth of a meter. The infrared part of the spectrum is usually devided in three areas.
Near-infrared (near-IR): - Closest to visible light, occupying the vawelength range from 0.75 to 1.3 microns, or 700 billionths to 1,300 billionths of a meter.
Mid-infrared (mid-IR): - Mid-IR has wavelengths ranging from 1.3 to 3 microns.
Thermal-infrared (thermal-IR) - Between 3 microns to 30 microns.
Every body that has a temperature above absolute zero, emits electromagnetic radiation, and objects at room temperature or outdoor temperature mostly radiate in the infrared spectrum.
This radiation can be used to view objects in absolute darkness. Infrared imaging also makes it possible to easily discern warmer objects from colder.
By illuminating the objects with an infrared illuminator one can also make picture of objects and surroundings even clearer, without disturbing the darkness.
Infrared light can be catched and refracted by optics like visible light, but in order to be viewed, one must use a film or detector that senses the radiation and converts the signals to an ordinary image. Usually the near-infrared spectrum is used for night viewing.
In night vision devices one uses detector plates with a grid of huge number of sensors, The sensors contain chemicals that change the electrical resistance or make an electric potential when illuminated by infrared light.
Examples of chemicals used in such detectors are:vanadium(V) oxide, lanthanum barium manganite, amorphous silicon, lead zirconate titanate (PZT), lanthanum doped lead zirconate titanate (PLZT), lead scandium tantalate (PST), lead lanthanum titanate (PLT), lead titanate (PT), lead zinc niobate (PZN), lead strontium titanate (PSrT), barium strontium titanate (BST), barium titanate (BT), antimony sulfoiodide (SbSI)