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空心Bragg光纤可广泛用于气体传感,但要求它的传输通带处于中红外波段,以便与待测气体的基频吸收峰匹配.本文提出了空心Bragg光纤传输通带的一种设计方法与波长控制工艺,可以实现传输通带在2.5-12μm内任意波长的空心Bragg光纤的制备.实验制备出一阶传输通带分别在10.6μm和3.3μm的光纤样品,利用截断法测量出其一阶传输通带损耗分别为5.9 dB/m和8.8 dB/m.利用在传输通带在3.3μm的样品中注入和排出甲烷/氮气混合气体,观察到了光纤样品透射谱随注入气体浓度的变化,并用指数稀释法初步测量了该系统的浓度探测极限约为26 ppm,验证了该光纤应用于气体传感的可行性.
Hollow Bragg fiber can be widely used for gas sensing, but its transmission band is required to be in the mid-infrared band to match the fundamental absorption peak of the gas to be measured.This paper presents a design method of hollow Bragg optical fiber transmission bandpass Wavelength control process can be achieved through the preparation of hollow Bragg optical fiber with pass band at any wavelength in the range of 2.5-12μm.The optical fiber samples with the first passband of 10.6μm and 3.3μm were prepared respectively and the first order Transmission band loss of 5.9 dB / m and 8.8 dB / m, respectively.Using the mixed gas of methane and nitrogen injected and discharged into the 3.3 μm sample in the transmission band, the change of transmission spectrum of the optical fiber with the concentration of the injected gas was observed and used The exponential dilution method initially measured the detection limit of the system at a concentration of about 26 ppm, verifying the feasibility of this fiber for gas sensing.