Velasco-Bolom P M, Camas-Anzueto J L, Lopez-Cortes D, Avendaño-Roque A J, Ruiz-Perez V I
Appl Opt. 2023 May 10;62(14):3637-3642. doi: 10.1364/AO.485139.
An optical fiber pH sensor based on a multimode interference structure is presented. The sensitive element is a piece of no-core fiber (NCF) coated with a mixture of polyallylamine hydrochloride and polyacrylic acid by a modified layer-by-layer (LbL) self-assembly method. It is experimentally shown that by reducing the diameter of the NCF by chemical etching, the sensitivity is increased from -0.31 / to -2 / . The sensor exhibits a high linear response of 0.997 over a pH range from 5 to 11.3 with a rapid response time lower than 1 s.
提出了一种基于多模干涉结构的光纤pH传感器。敏感元件是一段通过改进的逐层（LbL）自组装方法涂覆有盐酸聚烯丙胺和聚丙烯酸混合物的无芯光纤（NCF）。实验表明，通过化学蚀刻减小NCF的直径，灵敏度从-0.31 / 提高到-2 / 。该传感器在5至11.3的pH范围内表现出0.997的高线性响应，响应时间快速，低于1秒。
