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S. BINU1,* , N. CHANDRASEKARAN2
This paper reports the principle of operation, design aspects, experimentation and performance of an extrinsic PMMA (polymethyl methacrylate) fibre optic probe for the measurement of micro displacement. The device consists of fibre optic transmitter, fibre optic probe, reflective surface, photodiode detector and digital multimeter. The fibre optic probe consists of three 80 cm long PMMA (polymethyl methacrylate) fibres of diameter 1mm, numerical aperture 0.5, core refractive index 1.492 and cladding refractive index 1.402. The sensor can work in either the positive slope region or the negative slope region. The sensor is capable of measuring displacement ranging from 0.1 to 0.8mm with sensitivity of 3.002 V/mm in the positive slope region and 1.4 to 2.6 mm in the negative slope region with a sensitivity of -1.031V/mm. The fibre optic sensor is a promising alternative to other well-established methods for the measurement of displacement due to its simplicity of design, high precision, long term stability, linearity, high degree of sensitivity, dynamic range, non-contact sensing and low cost of the fabrication make it suitable for applications in industries for position control, measurement in the hazardous regions and on-line measurement or inspection of test components.
Fibre optic sensor, Micro displacement sensor, Fibre optic probe, PMMA (polymethyl methacrylate) fibre.
S. BINU, N. CHANDRASEKARAN, PMMA (polymethyl methacrylate) fibre optic probe as a displacement sensor, Optoelectronics and Advanced Materials - Rapid Communications, 4, 7, July 2010, pp.951-954 (2010).
Submitted at: Jan. 4, 2010
Accepted at: July 14, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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