<abstract xmlns="http://www.w3.org/1999/xhtml">

<p>In order to discuss the application and mode of the forced modulation function in a sensor, the optical fibre emphasis function was established by referring to the geometric method, the tilt factor and the shape factor of the reflecting surface. These were introduced for the first time, and the corresponding mathematical model was established. The method of numerical simulation is systematically studied and multimode optical fibre parameters (including optical fibre of axial spacing, optical fibre core diameter and numerical aperture) are adopted. The reflective surface inclination and shape factors on the RIM–FOS intensity modulation characteristics are studied according to the obtained light quasi-Gaussian distribution model, establishing a general three-intensity modulation function of fibre optic sensor. The results show that the intensity modulation characteristic of specular reflection is obviously better than that of the diffuse reflection surface, and the peak value of the modulation function is five times that of diffuse reflection. The intensity modulation characteristic decreases with increase in the roughness of the reflection surface. The system can not only complete the RIM–FOS characteristic simulation and characteristic testing functions, but can also start-up the test and not be affected by the ambient light interference and power fluctuation of the light source. The test stability is good with high repeatability.</p>
</abstract>

In order to discuss the application and mode of the forced modulation function in a sensor, the optical fibre emphasis function was established by referring to the geometric method, the tilt factor and the shape factor of the reflecting surface. These were introduced for the first time, and the corresponding mathematical model was established. The method of numerical simulation is systematically studied and multimode optical fibre parameters (including optical fibre of axial spacing, optical fibre core diameter and numerical aperture) are adopted. The reflective surface inclination and shape factors on the RIM–FOS intensity modulation characteristics are studied according to the obtained light quasi-Gaussian distribution model, establishing a general three-intensity modulation function of fibre optic sensor. The results show that the intensity modulation characteristic of specular reflection is obviously better than that of the diffuse reflection surface, and the peak value of the modulation function is five times that of diffuse reflection. The intensity modulation characteristic decreases with increase in the roughness of the reflection surface. The system can not only complete the RIM–FOS characteristic simulation and characteristic testing functions, but can also start-up the test and not be affected by the ambient light interference and power fluctuation of the light source. The test stability is good with high repeatability.

Application of Forced Modulation Function Mathematical Model in the Characteristic Research of Reflective Intensity Fibre Sensors

Applied Mathematics and Nonlinear Sciences

This work is licensed under the Creative Commons Attribution 4.0 International License.

In order to discuss the application and mode of the forced modulation function in a sensor, the optical fibre emphasis function was established by referring to...

	The experimental sequence	1	2	3	4	5	6	7	8	9
The town of spectroscopic Spectroscopic fill Their data	Measure the signal (v}	0.6380	0.7075	0.8263	0.9326	0.9873	1.0646	1.1069	1.1241	1.1301
	Reference signal (v}	0.2554	0.3271	0.4896	0.6750	0.8049	1.0217	1.1940	1.2644	1.3470
	The ratio of	2.498	2.163	1.688	1.382	1.227	1.042	0.927	0.889	0.839
Type II fibre beam splitting compensation	Measure the signal (v}	0.3776	0.91325	1.4256	2.0683	2.7413	3.2959	3.9183	4.3254	4.6840
	Reference signal (v}	0.2819	0.6692	1.5036	1.5437	20.569	2.4815	2.9666	3.2935	3.5949
	The ratio of	1.339	1.365	1.353	1.340	1.333	1.328	1.321	1.313	1.303

Application of Forced Modulation Function Mathematical Model in the Characteristic Research of Reflective Intensity Fibre Sensors

Publié en ligne: 15 déc. 2021

Pages: 884 - 892

Reçu: 16 juin 2021

Accepté: 24 sept. 2021

DOI: https://doi.org/10.2478/amns.2021.1.00073

Mots clés
Optical fibre sensor, reflection intensity modulation, mathematical model

© 2021 Lihua Dai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Fig. 2

Experimental data of two kinds of spectral compensation

Application of Forced Modulation Function Mathematical Model in the Characteristic Research of Reflective Intensity Fibre Sensors

Publié en ligne: 15 déc. 2021

Pages: 884 - 892

Reçu: 16 juin 2021

Accepté: 24 sept. 2021

DOI: https://doi.org/10.2478/amns.2021.1.00073

Mots clésOptical fibre sensor, reflection intensity modulation, mathematical model

© 2021 Lihua Dai et al., published by Sciendo

This work is licensed under the Creative Commons Attribution 4.0 International License.

Fig. 1

Fig. 2

Experimental data of two kinds of spectral compensation

Mots clés
Optical fibre sensor, reflection intensity modulation, mathematical model