Decisions that have major implications for operational efficiency and safety often rely on the measurement of defects and the monitoring and recording of component wear, particularly in turbine inspections. The Digital Measuring Borescope system (DMBS) is a rigid borescope system capable of providing accurate and repeatable measurements. It has been approved by Pratt & Whitney for inspection of the F100 engine and Rolls-Royce for measurement of the RB211-524.

The system comprises a specially designed 8mm (0.315?) diameter, swing prism borescope in working lengths of 25cm or 45cm (9.8 or 17.7") and a calibrated camera system. A precision optical encoder wheel, integral to the borescope control body, provides an output of the instrument?Ts exact focus position and object distance. This is then used in conjunction with a separate control unit, the Digital Measuring Borescope Controller (DMBC) to provide an operational system. An additional light source and CCTV monitor complete the system, and optionally a standard swing prism borescope can be added to the kit for preliminary inspections prior to measurement.

Once connected and set up, the system is capable of precise 2-dimensional point-to-point linear, point-to-line and depth measurements, all accurate to within 2%.

No calibration of the system is required, as an accurate measurement check tool is supplied in the kit to provide the inspector with confidence in the measurement results prior to using the instrument in the application.

The DMBC control unit features both s-video and composite video outputs and can be easily connected to an image storage device (such as the Olympus IW-R1 or DSM-2) allowing images to be re-measured at a later date, or transferred to a PC for archiving or report writing.

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