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Hunting animals at night or merely observing them is an entirely different experience than doing so in the daylight. Many animals are much more active after the sun goes down. You can use night vision binoculars to check out the environment for yourself. It can amaze you if you aren't completely prepared for it.

You will find many good choices of night vision binoculars at military supply stores. These are the same type of binoculars that are featured in US military army tanks. Soldiers are very confident in the abilities of these binoculars. They offer the latest technology including a strap to place them securely around the head for hands free use. Many of them offer special features the will give you all sorts of information against your enemy, especially if they don't have the same technology.

If you have ever wondered how these types of binoculars work I will share the basic concepts here with you. There are two different types of night vision binoculars available - image enhancement and thermal imaging. The image enhancement models collect small amounts of light to form the outline of the image. They are able to collect the light that is difficult for our own eyes to see.

Thermal imaging binoculars allow a small amount of light to be used in the upper spectrum. This is the same concept introduced in infrared night vision binoculars. It also responds to heat more than to light. If an object is warm then it will show up sooner.

If you found this information on Night Vision Binoculars useful, you'll also want to read about Binoculars Microscope.

How A Polarimeter Works

The Simple Explanation

Imagine tying a piece of thick rope to a hook in a wall, and then shaking the rope vigorously. The rope will be vibrating in all possible directions - up-and-down, side-to-side, and all the directions in-between - giving it a really complex overall motion.   Now, suppose you passed the rope through a vertical rectangular hole, like this: []. The rope has a really tight fit in the hole. The only vibrations still happening at the other side of the hole will be vertical ones.  All the others will have been prevented by the hole.

What emerges from the hole could be described as "plane polarized rope", because the vibrations are only in a single (vertical) plane.   Now look at the possibility of putting a second hole on the rope.  If it is aligned the same way as the first one, the vibrations will still get through.   But if the second hole is at 90° to the first one (so horizontally), the rope will stop vibrating entirely to the right of the second hole. The second hole will only let through horizontal vibrations - and there aren't any.

Light is also made up of vibrations - this time, electromagnetic ones. Some materials have the ability to screen out all the vibrations apart from those in one plane and so produce plane polarized light.   The most familiar example of this is the material that Polaroid sunglasses are made of.  If you wear one pair of Polaroid sunglasses and hold another pair up in front of them so that the glasses are held vertically rather than horizontally, you'll find that no light gets through - you will just see darkness. This is equivalent to the two holes at right angles in the rope analogy. The polaroids are "crossed".   (This not exactly the way Polaroid glasses work, but it gives a good idea).

A polarimeter works the same way: You have two polaroid glasses, like the two holes with the rope, one glass is the polarizer, the other glass is the analyzer. The polarizer ensures that only a beam of polarized monochromatic light (light of only a single frequency - in other words a single color) is passed through the solution behind the polarizer in the polarimeter.  After the tube with the solution is the analyzer.   The polarimeter is originally set up with water in the tube. Water isn't optically active - it has no effect on the plane of polarization.  The analyzer is rotated until you can't see any light coming through the polarimeter. The polaroids are then "crossed".

An optically active substance is a substance which can rotate the plane of polarization of plane polarized light. If you shine the polarized monochromatic light through a solution with an optically active substance, then light emerges: its plane of polarization is found to have rotated. The substance rotates the plane of polarization of the light, and so the analyzer won't be at right-angles to it any longer and some light will get through. You would have to rotate the analyzer in order to cut the light off again.
The rotation may be either clockwise or anti-clockwise. Assuming the original plane of polarization was vertical, you can easily tell whether the plane of polarization has been rotated clockwise or anti-clockwise, and by how much.

About the Author

National Microscope Exchange has been in business since 1991, selling and servicing polarimeters, refractometers and microscopes.The service staff has 30 years of experience with microscopes, and is the authorized United States service facility for Atago brand refractometers, polarimeters.

A ______________ is a device with a lens or group of lenses that makes very tiny things look larger?

A) telescope
B) microscope
C) pair of binoculars

D) Magnifying glass

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