An optical transmitter is energized from a DC source on the digital relay, and emits unpolarized light of known intensity and wavelength to a linear polarizer, and the Stokes vector polarization parameters are calculated from the Mueller Matrix of the linear. An optical transmitter is energized from a DC source on the digital relay, and emits unpolarized light of known intensity and wavelength to a linear polarizer, and the Stokes vector polarization parameters are calculated from the Mueller Matrix of the linear. Jose Miguel Lopez-Higuera: Handbook of Optical Fiber Sensing Technology, John Wiley & Sons, 2002. P 603 Radiation absorption excites an orbital electron to a higher energy level. Radiation absorption creates electronic excited states that are trapped by localized defects for extended periods of. A fiber optic sensor measures a physical quantity by modulating the intensity, spectrum, phase, or polarization of light traveling through the optical fiber system. Think of it like a photoresistor, which changes its resistance based. An optical fiber loop current sensing controller module, which integrates with the electrical power, and data processing and transmission, back-plane of a digital micro-processor relay for modular integration with the protection, metering, and communication functions of an electrical SCADA system. Optical fiber sensors (OFSs) have emerged as essential tools in the monitoring of physical, chemical, and bio-medical parameters in harsh situations due to their high sensitivity, electromagnetic interference (EMI) immunity, and long-term stability. These sensors mainly measure physical quantities, such as object displacement and pressure, by.