Temperature cross-sensitivity compensation in liquid level sensor using Mach-Zehnder interferometers

Camilo A. R. Díaz; Arnaldo Leal Jr.; Anselmo Frizera; Maria J. Pontes; Paulo F. C. Antunes; Paulo S. B. André; Moisés R. N. Ribeiro

doi:10.1117/12.2507065

27 February 2019 Temperature cross-sensitivity compensation in liquid level sensor using Mach-Zehnder interferometers

Camilo A. R. Díaz, Arnaldo Leal Jr., Anselmo Frizera, Maria J. Pontes, Paulo F. C. Antunes, Paulo S. B. André, Moisés R. N. Ribeiro

Author Affiliations +

Proceedings Volume 10914, Optical Components and Materials XVI; 1091425 (2019) https://doi.org/10.1117/12.2507065
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

This paper presents a technique for temperature cross-sensitivity compensation in liquid level sensor based on an in-fiber Mach-Zehnder interferometer. By using a commercial splicing machine and three different fibers, it is possible to construct a liquid level sensor with range of 120 mm and submillimeter resolution (0.88 mm). The sensor arrange is anchorage into a glass pipette, where the liquid level can be easily supervised. A broadband source is used to illuminate the sensor and the transmitted spectrum is monitored with an optical spectrum analyzer with 30 pm resolution. The interference pattern, created by the interferometer, is analyzed with either the traditional method of tracking peaks and dips or the overall spectrum envelope. These interferometers are sensitive to temperature variations, leading measurements errors on the liquid level estimation. Thus, an analysis of the temperature effect in the sensor response is performed. The result shows that the proposed technique reduces the sensor temperature cross-sensitivity by more than an order of magnitude. With traditional method (using peaks and dips), the value achieved was ~9.595 mm/°C, whereas the proposed approach based on the spectrum envelope leads to a temperature cross-sensitivity of about 0.562 mm/°C. The proposed sensor arrange is suitable for industrial applications such as chemical processing, fuel storage and transportation systems, oil tanks/reservoirs, and treatment plants, where there is simultaneous variations of temperature and level.

Citation Download Citation

Camilo A. R. Díaz, Arnaldo Leal Jr., Anselmo Frizera, Maria J. Pontes, Paulo F. C. Antunes, Paulo S. B. André, and Moisés R. N. Ribeiro "Temperature cross-sensitivity compensation in liquid level sensor using Mach-Zehnder interferometers", Proc. SPIE 10914, Optical Components and Materials XVI, 1091425 (27 February 2019); https://doi.org/10.1117/12.2507065

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