Objective As people tend to pay much attention to the ecological environment, the detection of liquid salinity in hydrological environments has gradually become an indispensable part of research fields such as agricultural planting, aquaculture, and monitoring of the marine environment. Surface plasmon resonance (SPR) technology has unique 研究论文 第 43 卷 第 3 期/ 光学学报 experimentally studied. By comparing the experimental results, the resonance peak of the Ag/In structure SPR sensorshows a larger wavelength shift, and its refractive index sensitivity is about 44% higher than that of the Ag structure fiber SPR sensor in a mass fraction measurement range of 1. 4%-3. 6%, which can realize salinity measurement in a full depth range of 0--5000 m. Therefore, the introduction of highpurity indium outside the silver film can improve the sensitivity and stability of the sensor, and the sensor can be applied in fields such as environmental monitoring, biomolecular measurement, and climate prediction.
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