With stereo measurement method, which is also sometimes known as stereo probe measurement, we can accurately measure defects in real time which uses a prism or dual lens to split images, allowing the camera to capture left and right views with a precise angle of separation. The position of user-placed cursors is then analysed using a computer algorithm and triangulation geometry is applied to them to obtain accurate measurements. The accuracy of this method depends on the separation distance between the prism or dual lens and on the distance of the distal end of the borescope from the object being measured. The sharpness and contrast of the image in question are also very important for the accuracy of the measurement. Unlike other methods, the stereo method does not depend on being perpendicular between the object plane and the videoscope distal tip.

The primary advantage of RVI is that it allows for the examination of most plant systems and components without requiring confined space entry or disassembly. It can therefore be considerably less expensive than other methods. Likewise, it’s far safer than traditional methods of inspection that involve sending inspectors into unsafe conditions.