An optical fiber sensor based on a fluorescent molecular probe has been developed to measure the pH of cementitious materials, from the early stages of hydration to advanced ageing of the material. A fluorescent molecular probe, Naphth-AlkyneOMe was entrapped in a cross-linked polyvinyl alcohol-glutaraldehyde matrix to generate thin films with well-defined physicochemical and photophysical properties. The obtained sensing films, with an average thickness of 150 μm, have showed reversible and reliable responses to pH changes. The developed optode has the required characteristics for the study of concrete, with a response time of 100 s and a precision of ±0.1 pH units. Measurements of pH were performed on the surface of low-pH cement paste samples after 4, 6, 7 and 8 days of hydration.

已经开发出一种基于荧光分子探针的光纤传感器来测量水泥材料的pH值，从水合的早期阶段到材料的高级老化。将荧光分子探针Naphth-AlkyneOMe包裹在交联的聚乙烯醇-戊二醛基质中，以产生具有明确的理化和光物理性质的薄膜。所获得的平均厚度为150μm的传感膜已显示出对pH变化的可逆且可靠的响应。研发的光电二极管具有混凝土研究所需的特性，响应时间为100 s，精度为±0.1 pH单位。在水化4、6、7和8天后，对低pH值水泥浆样本的表面进行pH值测量。