Dr. Tingting Huang Profile

Dr. Tingting Huang

at Tianjin Univ.

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Proceedings Article | 20 December 2019 Paper

Theoretical analysis and ZEMAX simulation of the effect of target distance on collection efficiency of fiber probe

Xiuming Li, Tingting Huang, Fajie Duan

Proceedings Volume 11209, 1120955 (2019) https://doi.org/10.1117/12.2549988

KEYWORDS: Zemax, Distance measurement, Signal to noise ratio, Optical coherence tomography, Optical fibers, Light sources, Analytical research, Near field optics

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Fiber probe is an important component in optical coherence tomography (OCT) and distance measurement system, its collection efficiency of the light reflected from target surface directly affects the signal-to-noise ratio (SNR) of the system, while the target distance will have direct influence on the collection efficiency. However, there are few researches on specific analysis of the collection efficiency variation of fiber probe when target distance change. In this paper, we proposed the theoretical model of fiber probe, and we deduce the collection efficiency of the light reflected from the target surface which is deviated from the ideal image plane of the fixed-focus fiber probe with Δl in the direction of the optical axis. The theoretical result is testified by ZEMAX simulation, and the difference between the simulation result and the theoretical calculation is 0.0023 when Δl = -5mm. In addition, ZEMAX is utilized to simulate the light collection efficiency when target distance change for reflective target surface. The results of simulation are basically consistent with theoretical calculation. It is concluded that the rate of descent for the collection efficiency is greater when target surface is placed in front of the ideal image plane, and the working range of the fiber probe increases with the increase of ideal image distance. The findings can guide us to make effective use of fiber probe and chose a detector with the right dynamic range to improve distance measurement precision.

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