Learn about Borescopes

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Borescopes consist of a tube, an eyepiece and an optical system (typically involving a mirror, lens or prism). They are used to inspect cylindrical cavities, such as gun barrels, internal bores and automotive components. Because rigid borescopes generally involve a direct translation of the image, they are more accurate than flexible borescopes, known as fiberscopes, which use a cluster of fiber-optics to record the image. Fiberscopes, however, can be used to examine small, curved cavities and other areas that are inaccessible for a normal rigid borescope.

Both borescopes and fiberscopes can be linked to video imaging and recording devices to allow users to replay the image or to examine it at a distance from the object being inspected. Rigid borescopes are designed to offer various straight, retro and/or side views of the inspected cavity. Side views generally provide the most detailed image of cylindrical cavities. A swing-prism design at the viewing tip of the scope allows users to examine a wide arc of the inspected area. Extendable borescopes provide a means to view shallow and deep cavities merely by setting the telescoping length of the scope to the correct distance.

Borescopes generally include a means to light the image being viewed; often, this is achieved through fibers located in the borescope’s insertion tube that are attached to a light source. High intensity, ultraviolet and explosion-proof light sources are all available through borescope manufacturers. Certain heavy-duty applications may require the use of specialized, durable lenses and components capable of withstanding various temperatures and/or environmental factors. Other operations, such as inspection of delicate electronic and medical devices, may necessitate the use of micro borescopes.

Design, method of manufacture, optics and size all determine the effectiveness and quality of a borescope. Given equal components, a larger borescope will provide a more precise image. Selection should be based on image quality, access specifications, field and direction of view and the nature of the application.