Visual Testing is the process of examination and evaluation of systems and components through the use of human sensory systems which is usually aided by mechanical enhancements to sensory inputs such as magnifiers, inspection mirrors, inspection lights, measuring tape, gauges etc. The inspection process is based on observations that are correlated with knowledge of applicable codes and standards.
Direct visual examination may usually be made when access is sufficient to place the eye within 24 inch (600mm) of the surface to be examined and at an angle not less than 30° degrees to the surface to be examined.
Mirrors may be used to improve the angle of vision and aids such as a magnifying lens which may be used to assist examination. Illumination (natural or supplemental white light) may be required for the specific part component, vessel or section thereof being examined.
Remote Visual - Borescope / Fiberscope Inspection with cameras:
Borescopes are used to non-destructively inspect the condition of various types of industrial systems and equipment to ensure fitness for continued service. This form of inspection is utilized greatly in many Preventative Maintenance programs
|A videoscope or video borescope typically utilizes a CCD or CMOS camera sensor, located at the tip of the borescope, to produce an image that is relayed to an external viewing device such as an LCD monitor.||
A fiberscope utilizes a fiber optic image guide to transmit an image from the objective lens to a relay lens. The image can be viewed through an eyepiece or connected to an adapter and attached to a CCD camera for viewing real time video.
|A rigid borescope utilizes a lens system to relay the image from the objective to a relay lens. The image can then be viewed through an eyepiece or connected to an adapter and attached to a CCD camera for viewing real time video|