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设计开发了一种光纤NH3气体传感器．其探头结构采用指示剂＋内充液型。将指示剂吸附于阴离子交换膜上，敏感膜固定于光纤末端，气体穿过透气膜进入探头，使探头内部电解质溶液的pH值发生变化，从而改变了内充液中指示剂的共轭酸碱异构体的浓度比，检测限为2μmol／L．
Design and development of a fiber optic NH3 gas sensor. The probe structure using indicator + filling liquid type. The indicator is adsorbed on the anion exchange membrane, the sensitive membrane is fixed on the fiber end, the gas penetrates the breathable membrane into the probe to change the pH value of the probe internal electrolyte solution, thereby changing the conjugate acid-base Isomer concentration ratio, detection limit of 2μmol / L.