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This article provides general information on borescope, their different uses, types and parameters. The borescope is an optical device which can have either a flexible or rigid tube with an eyepiece on one end an objective lens on the other connected together by a relay optical system, which is surrounded by optical fibers that illuminate the remote object. A borescope allows the person to view a magnifying image of a remote object, which is hard to reach by any other means. Depending on the tube, borescope are divided in two types - rigid or flexible. Both rigid and flexible borescopes have their advantages, therefore you must pick one depending on the type of area that must be inspected. The rigid borescopes are the more commonly used type, because of their better cost vs. performance ratio. The advantage of the flexible borescop is that it lets you see inside spaces that a rigid borescope can't penetrate. The quality of the image produced by a rigid borescope is higher compared to flexible models, and they are also easier to use and can spot flows as small as 0.001. If we have to sum things up, the conclusion is that you should buy a rigid borescope unless if movement limitations are not a problem (have to be in a straight line). There isn't a universal borescope that combines the advantages of both types, at least not for now. One can't say which type is better, it all depends on the specific borescope use. The conclusion is the when choosing a borescope to buy, you must have a clear idea where exactly you will be using it. Once you know the type, then you have to choose the diameter, so that the borescope will be able to enter the smallest hole required. It's always best to plan for some degree of free movement, that's why get a slightly smaller diameter than the allowed minium. The mangnification of a borescope is a measure of howw large and object appears when viewed through the borescope as compared to its actual size when viewed from the same location without the borescope. But keep in mind that if the object moves further, the magnification doesn't increase automatically with object distance. The images produced by a borescope can be captured on a certain digital cameras. But not all borescopes and cameras are compatible. You should consult with a sales agent or check the manual or internet to see if the two particular models which you have in mind will work properly together. An objective lens with long focal length is requried when you want the image from the borescope to fill up the whole screen. The focal length on the camera must be at least 35mm. If you have a 3 megapixel camera, then a 3x digital zoom will be fine. And because cameras are not originally designed to support a borescope, make sure there is no over-strain which can lead to structural damage of the devices.
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flexible borescopes also are called Fiberscopes - because their relay optical system that transfer image consist of thousands of tiny fibers (fiber optic image bundle). Author - Stephen Landreaux.
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