SHIP FLEXURE MEASUREMENTS
An electrooptic alignment system which is insensitive to angular displacements has been built. It consists of an intensity-modulated laser, a lens and a Schottky barrier position-sensing photodiode. Another afocal lens system with unit magnification has been developed to monitor displacement and tilt of an object moving in a straight line; however, it either measures displacement and is unaffected by tilt or measures tilt and is unaffected by displacement. Therefore, two assemblies need to be mounted side by side in a common block to measure tilt and displacement simultaneously. This report describes a ship flexure monitoring system which has been developed to measure four degrees of freedom simultaneously. This system does not measure roll, the fifth degree of freedom; however, by using a polarizer of half-wave plate and detecting polarization changes, roll measurements can be incorporated.
Naval Weapons CenterChina Lake, CA USA
- Hutcheson, L D
- Publication Date: 1975-8
- Pagination: 16 p.
- TRT Terms: Flexural strength; Hulls; Instrumentation; Lasers; Measuring instruments; Ship motion; Stiffness
- Uncontrolled Terms: Flexural stiffness
- Old TRIS Terms: Hull instrumentation; Instrumentation technology
- Subject Areas: Marine Transportation; Vehicles and Equipment;
- Accession Number: 00195768
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NWC-TM-2574 Tech Memo, GIDEP-E094-0768
- Files: TRIS
- Created Date: Jul 31 1979 12:00AM