Research on sensing characteristics of low-finesse fiber-optic Fabry-Perot cavity

Jian-ghai Zhao; Xiao-dong Ye; Shao-min Sun; Lin-sen Xu

doi:10.1117/12.966803

15 October 2012 Research on sensing characteristics of low-finesse fiber-optic Fabry-Perot cavity

Jian-ghai Zhao, Xiao-dong Ye, Shao-min Sun, Lin-sen Xu

Proceedings Volume 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment; 841702 (2012) https://doi.org/10.1117/12.966803
Event: 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies (AOMATT 2012), 2012, Xiamen, China

Abstract

The Low-Finesse Fabry-Perot(F-P) cavity, as a kind of fiber-optic sensor probe frequently used, can be applied to detect physical parameters of strain, temperature, acoustic wave, pressure, and so on, and is an important optical sensing component. In this paper, sensing properties of low-finesse F-P cavity is deeply and systemically analyzed. At first, the interference principle of F-P cavity is illuminated from three aspects which include the distribution of light power, the characteristic of interference fringe and the sensitivity. Considering the spectrum of incident beam obeys a Gaussian distribution, the intensity distribution of reflected beam is approximate to a cosine function within a Gaussian envelope and the visibility of interference fringes follows a Gaussian distribution also. Moreover, the operating point of low finesse F-P cavity must be held near the quadrature-point for the maximum sensitivity. The operating characteristic of FP cavity is analyzed from three aspects including linearity, property of temperature and contrast of fringe. Analyzing results show that the F-P cavity can offer the linearity of 2.2%, and the fringe contrast drops as the length of F-P cavity increases. In addition, the F-P cavity is insensitive to the change of environmental temperature and possesses an excellent capability to suppress the temperature disturbance. Finally, a test scheme is established to verify the sensor performance of F-P probe. Test results indicate that the F-P cavity offers the sensitivity of 7.5V/um and the measuring accuracy of 9.4nm, and can well satisfies the practical requirement.

Citation Download Citation

Jian-ghai Zhao, Xiao-dong Ye, Shao-min Sun, and Lin-sen Xu "Research on sensing characteristics of low-finesse fiber-optic Fabry-Perot cavity", Proc. SPIE 8417, 6th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optical Test and Measurement Technology and Equipment, 841702 (15 October 2012); https://doi.org/10.1117/12.966803

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KEYWORDS

Fiber optics sensors

Sensors

Fiber optics

Visibility

Sensing systems

Fabry–Perot interferometers

Capillaries

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