Tag: Fiber optics
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Fundamentals of Fiber Optics Sensing Technology
Fiber optics sensors basically consist of an optical source that is coupled to an optical transmission line that directs the radiation to a sensor head as illustrated below: The light is then returned after being modified in some way by the sensor interaction, via the optical fiber, in either a reflective or transmission mode, to…
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Power Measurement in Fiber Optics, How it is Done
Optical Power The basic unit of measurement in fiber optics is the light power. Just like electric power, optic power is measured in watts. For light, the total energy Q is given by: Q = NQp Where Qp is the energy of a single photon and N is the number of photons, therefore: The Power…
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Fiber Optic Temperature Sensors: Principle of Operation & Applications
As the name suggests these sensors employs fiber optics technology to function. A fiber optic sensor generally guides light to and from a measurement zone where the light is modulated by the measurand of interest and returned along the same or a different optical fiber to a detector at which the optical signal is interpreted.…
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Optical Time Domain Reflectometer (OTDR)
The commonly employed technique for analysing the state of a fibre optic is to test it with an Optical Time Domain Reflectometer (OTDR). The OTDR uses backscattered light of the fibre to imply loss. The OTDR works is similar way to RADAR, sending a high power laser light pulse down the fibre and looking for…