Measurement Science and Technology · 2013 · 13 citations · 24 references
EngineeringMaterials EngineeringMaterials ScienceOptoelectronicsPhotonicsSensorsFiber OpticsHumidity SensorsOptical FibersOptical SensingOptical SensorsRelative HumidityFiber-optic SensorsHumidityHumidity SensingOptical Fiber SensorsPhotonic Crystal FibersRelative Humidity MeasurementResponse TimeTemperature Compensation
A novel photonic crystal fiber (PCF) interferometer RH (relative humidity) sensor is proposed and demonstrated in this paper. The sensor is made from a piece of PCF spliced to standard fibers in transmission mode, which has the advantage that it does not require the use of any hygroscopic thin film or layer. In addition, the all-silica nature of the sensing element means the sensor is insensitive to temperature. The sensor has a humidity sensitivity of 60.3 pm/%RH over the range of 60–80% RH and 188.3 pm/%RH in the region from 80 to 95% RH. A response time around ~1 s is observed for a ~2 cm long section of photonic crystal fiber interferometer (PCFI). The sensor exhibits a very low cross temperature sensitivity of around 0.5 pm/°C. The proposed sensor has potential for high humidity monitoring applications, and temperature compensation is not necessary if such a sensor is operated in normal surrounding atmosphere.
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Chitosan based fiber-optic Fabry–Perot humidity sensor
L.H. Chen, Tao Li, Chi Chiu Chan et al. · Sensors and Actuators B Chemical · 2012 · 252 citations