Optical aids used in NDT
Optical aids embody magnifiers, microscopes, telescopes and additionally specialized devices like boroscopes, endoscopes and different fiber-optic devices for the inspection of restricted access areas. These devices may be used with video equipment systems. a lot of the success of visual examination depends on the surface condition and therefore the lighting arrangements. Surface preparation like improvement and etching is commonly used and additionally, surface replicas may be taken for each macro- and microscopic examination.
Types of optical aids
The utility of optical instruments during the visual inspection is beneficial to magnify the defect that can never detect by a naked eye helps in testing the area which is not accessible
Microscope
It’s a combination of lenses that used to magnify the image of a small object. Minute defects and details of fine structure on the test surface can easily be detected with a microscope. Optical microscope is generally used to evaluate with reference to the shape and orientation of the crack
Boroscope
Boroscope is generally used to inspect the inaccessible areas like the inside wall of a narrow tube, bore or chamber. The boroscope consists of a precision built-in illumination system. The size of a visual field varies with the diameter, for a given magnification system.
Endoscope
It is almost the same as a boroscope. The main adding advantage of the endoscope is that It has a superior optical system and a high-intensity light source. A unique feature of the endoscope is that objects are perpetually focused from regarding 4mm to time. The “no focusing” feature of endoscope makes it abundant easier to use than a borescope
Telescope
It is used to get enlarged pictures of objects at a tidy distance from the attention. It is especially helpful for providing a visual examination of the surface. It consists of 2 lenses known as objective or eyepiece
Holography
Holography is a name given to the strategy of getting an accurate/perfect 3D image of a given object. It is employed for the NDT of surfaces of extremely sophisticated and exactitude elements while not the disadvantages of getting to use a high power magnifier. It can offer a record of the image of a complete surface which may be promptly compared therewith of a typical defect-free surface.
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