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A detailed description of borescope properties, parameters, types and functions. 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 types of borescopes have their unique advantages (as well as disadvantages), making them suitable only for certain situations. Rigid borescopes the perfect tool for specific tasks, like inspecting automotive cylinders, fuel injectors, hydraulic manifold bodies and gunsmithing. Flexible borescopes can be used to access cavities which are around a bend, as oppose to rigid ones, that have the limitation that access to what is to be viewed is a straight line. However, the image quality of rigid borescopes is higher compared to flexible models, plus rigid borescops are easier to use and can spot flaws as small as 0.001. If movement is not your main priority, buy a rigid borescope. Flexible borescopes can be used to access cavities which are around a bend. But at the end, if you can buy both types that will be ideal, otherwise choose according to your specific situations that you are likely to exhibit. Therefore, when you are about to buy a borescope, you must be completely aware of what you will be using it for, whether you will be examining engines, parts surfaces, combustion chambers or turbibe blades. Perhaps the most important parameter of a borescope is the diameter. The rule here is to select a diameter that will fit through the smallest hole required, so that you can have space to manoeuvre inside. 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. Compatibility (borescope-camera) can certainly be an issue here. No one can guarantee if a particular digital camera will work satisfactorily with your borescope, unless it is explicitly stated in the official manual of the device. If you want the borescope image to fill a reasonable portion of the screen, then you need an objective lens with long focal length. To get hiqh quality images on your screen, the optical zoom range on your camera should go out to 350mm or longer, which is equal to 35mm focal length. For a 3 megapixel camera, the digital zoom must be at least with the power of 3x. Have in mind that the lens of the camera are not initially designed to support a borescope, so it might break if the strain is too high.
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Rigid Endoscopes are small tubular telescopes that enable the operator to look inside joints and body cavities and carry out surgical procedures using special endoscopic instruments. Author - Stephen Landreaux.
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