Wavelength division multiplexed fiber optic absolute position encoderA wavelength division multiplexing (WDM) method for fiber optic sensors is proposed which uses a broadband light source and narrow bandpass thin film optical filter coatings on cylindrical graded index lenses. In the WDM system described here, all bits are multiplexed onto a single signal return fiber by assigning each bit a unique wavelength. A multielement photodetector array is used as the encoded position information is in parallel. Preliminary prototype test results are presented.
Document ID
19900024653
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Park, Eric D. (Kollmorgen Corp. Inland Motor Div., Radford, VA, United States)
Gat, Erann (California Institute of Technology Jet Propulsion Laboratory, Pasadena, United States)