摘要
现已研究出一种具有特殊结构探头的光纤pH传感器。 该探头是由一束光导纤维制成,在它的顶部放了一层由聚苯乙烯微球所组成的敏感层,这一层也就是pH比色指示剂。在它的外面再包一层聚四氟乙烯的渗透膜。当指示剂周围溶液的pH值变化时将引起反射光波谱的吸收状况的变化。本文还讨论了用苯酚红作为指示剂的测量结果及性能指标。
A fibre-optic pH sensor having a specific construction, has been developed for pH measurement.The proeb is made of a fibre-optic bundle at end of which is fabricated a sensitive tip consisting of microspheres of poly acrylamide supporting an adsorbed colorimetric pH indicator, which is retained in position by a membrane of polytetraflouroethylene (PTFE). Changes in pH in the vicinity liquid of the sensitive tip cause a variation in the attenuation of specific visible reflected radiation bands. The measurement results and performance specifications using phenol red indicator are discussed in this paper.
关键词
光纤
PH传感器
比色法
指示剂
Fibre-optic, pH sensor, Colorimetry, Phenol red
