This paper reports a fiber Bragg grating(FBG)as a biosensor.The FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding layer.Consequently,the evanesc...This paper reports a fiber Bragg grating(FBG)as a biosensor.The FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding layer.Consequently,the evanescent field propagating out of the core will be closer to the environment and become more sensitive to the change in the surrounding.The proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely,copper ions(Cu^(2+)).Two FBG sensors were etched with 20 and 40μm diameters and fabricated.The sensors were studied towards Cu^(2+)with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper ions.The FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+concentrations when immersed in aqueous mediums.The sensors exhibited excellent repeatability towards Cu ions.The results demonstrate that the smaller FBG etching diameter,the better optical response in terms of wavelength and linearity.展开更多
A respiratory monitoring system was proposed based on optical fiber.The sensor consists of photonic crystal fiber(PCF)spliced with multimode fiber(MMF)to fabricate Michelson interferometer.The sensor is inserted into ...A respiratory monitoring system was proposed based on optical fiber.The sensor consists of photonic crystal fiber(PCF)spliced with multimode fiber(MMF)to fabricate Michelson interferometer.The sensor is inserted into an oxygen mask tube and then put on the nose and mouth to monitor the respiratory rate(RR)for different cases.The results showed that when breathing increased,the intensity of light decreased.The intensity of light in the sleeping case of breathing was more intense than that when the intensity of working sport was measured.The working sport case was a higher transmittance than that of sleeping.The sensitivity of the sensor was also measured to be 231.9 pm/RH.展开更多
文摘This paper reports a fiber Bragg grating(FBG)as a biosensor.The FBGs were etched using a chemical agent,namely,hydrofluoric acid(HF).This implies the removal of some part of the cladding layer.Consequently,the evanescent field propagating out of the core will be closer to the environment and become more sensitive to the change in the surrounding.The proposed FBG sensor was utilized to detect toxic heavy metal ions aqueous medium namely,copper ions(Cu^(2+)).Two FBG sensors were etched with 20 and 40μm diameters and fabricated.The sensors were studied towards Cu^(2+)with different concentrations using wavelength shift as a result of the interaction between the evanescent field and copper ions.The FBG sensors showed a good response in terms of significant wavelength shift in corresponding to varying Cu2+concentrations when immersed in aqueous mediums.The sensors exhibited excellent repeatability towards Cu ions.The results demonstrate that the smaller FBG etching diameter,the better optical response in terms of wavelength and linearity.
文摘A respiratory monitoring system was proposed based on optical fiber.The sensor consists of photonic crystal fiber(PCF)spliced with multimode fiber(MMF)to fabricate Michelson interferometer.The sensor is inserted into an oxygen mask tube and then put on the nose and mouth to monitor the respiratory rate(RR)for different cases.The results showed that when breathing increased,the intensity of light decreased.The intensity of light in the sleeping case of breathing was more intense than that when the intensity of working sport was measured.The working sport case was a higher transmittance than that of sleeping.The sensitivity of the sensor was also measured to be 231.9 pm/RH.
