Journal of Lightwave Technology · 2019 · 109 citations · 27 references
EngineeringMaterials EngineeringMaterials ScienceOptical MaterialsOpticsSensorsOptical FibersOptical SensingOptical SensorsRefractive IndexTemperature MeasurementTemperature SensorsFiber SensorsFiber-optic SensingFiber-optic SensorsFiber-optic Temperature SensorsOptical Fiber SensorsTemperature SensitivityTemperature Sensor SensitivityTorsion
The sensors measuring torsion, refractive index, and temperature are demonstrated, based on an improved helical long-period fiber gratings (HLPFG), in which the refractive-index and torsion sensitivity were significantly enhanced by reducing the grating diameter. This was achieved using the velocity difference between two translational stages as the optical fiber was heated by a hydrogen-oxygen flame. As the grating diameter decreases from 109 to 85 μm, the sensor's refractive-index sensitivity at RI of 1.444 increases from -1210.20 to -3133.80 nm/RIU, and torsion sensitivity was enhanced from -245.80 to -942.77 nm/(rad/mm), respectively. Moreover, the sensor's temperature sensitivity was measured to be about 77.17 pm/°C. Hence, such a sensor based on improved HLPFG could have great potential in sensing applications.
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Long-period fiber gratings as band-rejection filters
Ashish M. Vengsarkar, P. J. Lemaire, Justin B. Judkins et al. · Journal of Lightwave Technology · 1996 · 1.8K citations