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本文叙述了一种在光纤端面放置固定化pH染料指示剂的反射式光纤传感器,其探头结构是通过共价结合法把酚红、溴酚兰和百里酚兰等三种染料固定在丙烯酰胺微球上形成亲水凝胶状指示剂,用聚四氟乙烯网膜定位放置,同光纤端面间留有一定缝隙,便于指示剂与被测溶液的离子交换,反应。文中给出这种光纤传感器的全部性能参数,其测试范围3.0—5.0pH(溴酚兰指示剂);7.0—8.5pH(酚红指示剂)和8.0—10.0pH(百里酚兰指示剂);灵敏度66.6mV/pH;精度优于0.05pH;相关系数达99.9％;重复性0.013mV;响应时间(90％)对酚红指示剂为2min,对百里酚兰1min;滞后为0.52％;稳定性为0.015pH/h,该器件性能优良、制造简单,具有实用价值。
This paper describes a kind of reflective optical fiber sensor with fixed pH dye indicator placed on the fiber end face. The probe structure of the probe is to immobilize three kinds of dyes such as phenol red, bromophenol blue and thymol blue in acrylamide Microspheres form a hydrophilic gelatinous indicator, positioned with a Teflon mesh, leaving a gap between the fiber end face, to facilitate the indicator and the test solution ion exchange reaction. The full range of performance parameters for this type of fiber optic sensor is given in this paper. The test range is 3.0-5.0 pH (bromophenol blue indicator), 7.0-8.5 pH (phenol red indicator), and 8.0-10.0 pH (bromine blue indicator) ; The sensitivity was 66.6mV / pH; the accuracy was better than 0.05pH; the correlation coefficient was 99.9%; the repeatability was 0.013mV; the response time (90%) was 2min for phenol red indicator and 1min for thymol blue; Stability of 0.015pH / h, the device performance, manufacturing simple, with practical value.