Fiber Optic Displacement Sensor for Industrial Applications

Abstract

Owing to industrial applications, a fiber optic displacement sensor is introduced to determine the concentration of hydrocarbons in water. Hydrocarbon is organic water pollution. It can harm the environment as well as human being. Thus, a reflective configuration technique was developed to study the hydrocarbon concentrations in the range of 0-20%. To validate the designed system, two concentrations were selected which represent the lower and higher region. In principle, this sensor is using the concept of intensity modulation as a function of displacement. The optimum displacement between the reflecting target and the fiber optic probe was found to be at 1.5 mm for all concentrations. Furthermore, the peak voltage from each fingerprint was found to be inversely proportional to the tested concentration. This implies that the higher concentration of hydrocarbon tends to detect weaker signal. The sensitivity of the fiber optic displacement sensor was found to be 0.12 mV/wt. % with repeatability of 96 %. The resolution of the sensor was 0.027 V, with a limit of detection of 0.23%. The linearity index was found to be 0.98 and 1.04 corresponding to 6% and 14% hydrocarbon concentration respectively. The simplicity and the credibility of such system offer a good opportunity for industrial applications especially in the environmental sector 1530-437X (c)

Critical-Angle Differential Refractometry of Lossy Media: A Theoretical Study and Practical Design Issues

“…Refractive index sensors are intensely investigated for numerous biomedical [1][2][3], chemical [4,5] and industrial [6,7] applications. An indicative yet far from exhaustive list of sensing mechanisms relies on plasmonic [8][9][10][11], photonic crystal [12][13][14][15], micro-cavity [16][17][18][19], optical fiber [20][21][22][23] and wave-guide [24][25][26][27] configurations.…”

A low-cost fiber based displacement sensor for industrial applications

“…The 16 receiving fiber probe showed a better sensor performance both at the front slope and the first back slope region. So in 2015, Daing Hanum developed FODS using a bundle of plastic fiber and HeNe laser source as the light source [27]. In the research, the FODS is used to measure the concentration of hydrocarbon, an organic water pollution.…”

“…In the research, the FODS is used to measure the concentration of hydrocarbon, an organic water pollution. The sensor probe used in [27] has the same configuration as the 16 concentric receiving fiber in [26] but with less number of receiving fiber. The probe contains bundle of fiber optic which consists of two parts, one transmitting fiber and multiple receiving fiber.…”

“…Therefore, in this paper, an economical and high sensitivity displacement sensor has been developed based on the sensor head configuration in [27] using light emitting diode (LED) as the light source. A POF-based bundle is used as a probe and a thin gold film as the reflecting surface which in turns offer simplicity, reliability and continuous measurements capability.…”

Design, Fabrication and Calibration of Compliant, Multi-Axis, Fiber-Optic Force/Torque Sensors for Biomechanical Measurements

“…6 shows the working principles that enable the sensor to measure various physical variables such as force, pressure, temperature, displacement, etc [92]…”