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. 2024 Jan 11;24(2):448.
doi: 10.3390/s24020448.

Optimizing Algorithm for Existing Fiber-Optic Displacement Sensor Performance

Zeina Elrawashdeh  1   2 , Christine Prelle  3 , Frédéric Lamarque  3 , Philippe Revel  3 , Stéphane Galland  4
Affiliations

Optimizing Algorithm for Existing Fiber-Optic Displacement Sensor Performance

Zeina Elrawashdeh et al. Sensors (Basel). .

Abstract

This paper describes the optimal design of a miniature fiber-optic linear displacement sensor. It is characterized by its ability to measure displacements along a millimetric range with sub-micrometric resolution. The sensor consists of a triangular reflective grating and two fiber-optic probes. The measurement principle of the sensor is presented. The design of the sensor's triangular grating has been geometrically optimized by considering the step angle of the grating to enhance the sensor's resolution. The optimization method revealed a global optimum at which the highest resolution is obtained.

Keywords: displacement; fiber-optic sensor; global optimum; measurement range; resolution; sensitivity.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Fiber-optic sensor.
Figure 2
Figure 2
Response curve of the fiber-optic displacement sensor.
Figure 3
Figure 3
Inclined mirror configuration.
Figure 4
Figure 4
Long-range sensor principle.
Figure 5
Figure 5
Flow chart of the geometrical model.
Figure 6
Figure 6
Grating and emission fiber parameters.
Figure 7
Figure 7
Long-range measurement.
Figure 8
Figure 8
Calibration curve of the sensor.
Figure 9
Figure 9
Instantaneous sensitivity (mV/µm) as a function of displacement (µm).
Figure 10
Figure 10
Geometric model results. (a) l = 1433 µm, ε = 6.25°, (b) l = 1460 µm, ε = 6.14°.
Figure 11
Figure 11
Overlap (µm) vs. angle (°).
See this image and copyright information in PMC

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