Abstract
A non-contact vibration sensor is demonstrated using bifurcated bundle fiber based on the principle of extrinsic reflective intensity modulation for monitoring the health condition of the diesel engine. An IR-source is used along with glass fibers to avoid the effect of stray light in sensing. The encapsulation of the sensor enables easy alignment, flexible handling and usage in harsh environments. The sensor is capable of measuring the frequencies up to 650Hz with vibration amplitude resolution of 10µm, enough to monitor the vibrations generated in heavy machines like diesel engine.
Highlights
The periodic and non periodic change in displacement of mechanical and structural system about an equilibrium position is called vibration
Vibration measurement plays a major role in studying the dynamic behavior and failure of components in machines[1,2]
An optical fiber bundle of R=2mm front end radius consisting of 301 glass fibers with identical parameters of r=100μm, t=10μm, and numerical aperture (NA)=0.22 are used to carry out the theoretical analysis for the proposed sensor
Summary
The periodic and non periodic change in displacement of mechanical and structural system about an equilibrium position is called vibration. Vibration measurement plays a major role in studying the dynamic behavior and failure of components in machines[1,2]. Rotating machinery such as diesel engines, pumps and compressors are of the most critical classes of equipment in industry today. Continuous monitoring reduces maintenance, operating cost and avoiding undesirable engine working and frequent interruptions. Fiber optic sensors play a major role in sensing vibration apart from displacement and pressure and the advantage being high sensitivity, immune to EMI and low cost of maintenance[8,9,10].
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