【摘要】 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．更多还原

【Abstract】 A new optical fiber senser for ac analysis, speciallY for NH3 in environmental air and water is reported. The probe is made of bromothymol blue, ammonium chloride and polyterafluoroethylene(PTFE) "ho. The characteristies of the system are a double LED light sensors and a double beams compensation optical path. The sensitivities of the system for NH in Water is 2μmol/L.更多还原