DEVELOPMENT OF A VARIABLE ANGLE ROMAN CHAIR

Not Available To prevent high cycle fatigue (HCF) failure in turbine engines requires verification of analytical assumptions and substantiation of design adequacy as a key aspect of the engine design process, and realistic modeling of vibration in turbine engine requires extensive experimental data. Physical Optics Corporation (POC) proposes to develop a dynamic digital holographic vibrometer (DDHV) for non-intrusive vibration measurement of the whole blade of a turbine engine for on-line analysis. The high resolution DDHV instrument is based on a single snap-shot approach, and is unaffected by environmental conditions such as rotation, vibration, heat, and window contamination. The proposed device offers a unique integration of: high resolution holographic interferometry; whole-area, short-pulse recording; digital phase detection; electronic signal synchronization; high speed image capture and storage; and on-line image processing. In Phase I, POC will procure or develop the essential hardware and software, and integrate them as a preproduction prototype in Phase II. Phase I will also address issues related to compatibility and compactness of the proposed DDHV device, which are critical to meeting Air Force requirements.