Common path Bessel beam optical interferometry for refractive index measurement of hazardous liquid samples at 1550nm

Amit Pandey; Umesh K. Tiwari; Samir K. Mondal

doi:10.1117/12.2579232

5 March 2021 Common path Bessel beam optical interferometry for refractive index measurement of hazardous liquid samples at 1550nm

Amit Pandey, Umesh K. Tiwari, Samir K. Mondal

Author Affiliations +

Proceedings Volume 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI; 116350S (2021) https://doi.org/10.1117/12.2579232
Event: SPIE BiOS, 2021, Online Only

Abstract

This article presents a packaged optical fiber axicon tip generating high-quality Bessel beam and Bessel beam optical interferometry for measuring the Refractive Index of hazardous liquid like HCL, H₂SO₄ at 1550nm. The measurement resolution of our system is 1×10^-3± 0.0007. The packaged axicon feeds with broadband amplified spontaneous emission source through an optical circulator. Packaged axicon tip is dipped in different concentrations of liquid samples. The light reflects from the air-glass and glass-liquid interfaces, couples back to the optical fiber axicon tip, interferes with the reference beam generated at the air-axicon interface. The interference spectra are recorded in an optical spectrum analyzer via the third port of the circulator. The interference spectra are analyzed by applying fast Fourier transform. The FFT differentiates the power reflected from different interfaces which helps in solving the Fresnel equation to calculate the solution's RI as the glass RI is known.

Conference Presentation

Citation Download Citation

Amit Pandey, Umesh K. Tiwari, and Samir K. Mondal "Common path Bessel beam optical interferometry for refractive index measurement of hazardous liquid samples at 1550nm", Proc. SPIE 11635, Optical Fibers and Sensors for Medical Diagnostics, Treatment and Environmental Applications XXI, 116350S (5 March 2021); https://doi.org/10.1117/12.2579232

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