Optical fiber proximity sensor for micro distance measurement

This paper demonstrates an optical fiber proximity sensor for micro distance measurement. The optical fiber was used to detect a silver plate which acted as an obstacle. A flat end of a standard single mode optical fiber was functioned to emit the broadband light at near infrared wavelength region and receive the reflected light from the obstacle. The distance between the optical fiber and the obstacle was varied from 0μm to 400 μm. We experimentally characterized the sensor sensitivity based on their free spectral range. The optical fiber tip has shown its potential for proximity sensing application with sensitivity value of 0.0199 nm μm and regression value up to 0.9126

Liquid level monitoring with single layered rubber diaphragm fibre Bragg grating sensor

Liquid level monitoring is essential for the industry. Conventional electronic sensor for this application is susceptible to electrical and heat conductivity that is risky for flammable substances. Hence, this paper introduces a single-layered rubber diaphragm fiber Bragg grating sensor to overcome this matter. In this experiment, the sensor used a straining mechanism as a sensing effect to monitor the liquid level ranging from 0-1200 ml. The result shows that the Bragg wavelength shifted towards the longer region when increasing the liquid level. The sensor exhibited an average sensitivity of 0.0042 nm/ml and average linearity of 96.376%, promising a good result for liquid level monitoring