scholarly journals Giant Displacement Sensitivity Using Push-Pull Method in Interferometry

Photonics ◽  
2021 ◽  
Vol 8 (1) ◽  
pp. 23
Author(s):  
Paulo Robalinho ◽  
Orlando Frazão
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Maximum Sensitivity ◽  
Displacement Sensor ◽  
Maximum Performance ◽  
Displacement Sensors ◽  
Wide Range ◽  
Displacement Sensitivity ◽  
Vernier Effect

We present a giant sensitivity displacement sensor combining the push-pull method and enhanced Vernier effect. The displacement sensor consists in two interferometers that are composed by two cleaved standard optical fibers coupled by a 3 dB coupler and combined with a double-sided mirror. The push pull-method is applied to the mirror creating a symmetrical change to the length of each interferometer. Furthermore, we demonstrate that the Vernier effect has a maximum sensitivity of two-fold that obtained with a single interferometer. The combination of the push-pull method and the Vernier effect in the displacement sensors allows a sensitivity of 60 ± 1 nm/μm when compared with a single interferometer working in the same free spectral range. In addition, exploring the maximum performance of the displacement sensors, a sensitivity of 254 ± 6 nm/μm is achieved, presenting a M-factor of 1071 and MVernier of 1.9 corresponding to a resolution of 79 pm. This new solution allows the implementation of giant-sensitive displacement measurement for a wide range of applications.

scholarly journals Picosecond optically reconfigurable filters exploiting full free spectral range tuning of single ring and Vernier effect resonators

2015 ◽  
Vol 23 (9) ◽  
pp. 12468 ◽  
Author(s):  
Roman Bruck ◽  
Ben Mills ◽  
David J. Thomson ◽  
Benedetto Troia ◽  
Vittorio M. N. Passaro ◽  
...  
Keyword(s):  
Spectral Range ◽  
Free Spectral Range ◽  
Single Ring ◽  
Vernier Effect ◽  
Reconfigurable Filters

scholarly journals Effects of taper parameters on free spectral range of non-adiabatic tapered optical fibers for sensing applications

2016 ◽  
Vol 58 (4) ◽  
pp. 798-803 ◽  
Author(s):  
B. Musa ◽  
Y. Mustapha Kamil ◽  
M. H. Abu Bakar ◽  
A. S. M. Noor ◽  
A. Ismail ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Sensing Applications

Free spectral range variations of grating-based Fabry–Perot filters photowritten in optical fibers

1995 ◽  
Vol 12 (8) ◽  
pp. 1687 ◽  
Author(s):  
S. Legoubin ◽  
S. Boj ◽  
E. Delevaque ◽  
M. Douay ◽  
P. Bernage ◽  
...  
Keyword(s):  
Optical Fibers ◽  
Spectral Range ◽  
Free Spectral Range ◽  
Fabry Perot

scholarly journals Analytical Modeling for the Grating Eddy Current Displacement Sensors

2015 ◽  
Vol 15 (1) ◽  
pp. 44-51 ◽  
Author(s):  
Chunfeng Lv ◽  
Wei Tao ◽  
Huaming Lei ◽  
Yingying Jiang ◽  
Hui Zhao
Keyword(s):  
Eddy Current ◽  
Analytical Modeling ◽  
Expansion Method ◽  
Displacement Sensor ◽  
Modeling Approach ◽  
Eigenfunction Expansion Method ◽  
Displacement Sensors ◽  
Wide Range ◽  
New Type ◽  
Cartesian Coordinate

Abstract As a new type of displacement sensor, grating eddy current displacement sensor (GECDS) combines traditional eddy current sensors and grating structure in one. The GECDS performs a wide range displacement measurement without precision reduction. This paper proposes an analytical modeling approach for the GECDS. The solution model is established in the Cartesian coordinate system, and the solving domain is limited to finite extents by using the truncated region eigenfunction expansion method. Based on the second order vector potential, expressions for the electromagnetic field as well as coil impedance related to the displacement can be expressed in closed-form. Theoretical results are then confirmed by experiments, which prove the suitability and effectiveness of the analytical modeling approach.

Multiband filter at adjustable free spectral range by convolution of transfer functions according to the Vernier effect

2016 ◽  
Vol 10 (4) ◽  
pp. 128-133 ◽  
Author(s):  
Abdelaziz Ouariach ◽  
Abdelkarim Nougaoui ◽  
Rachid Malek ◽  
Tijani Gharbi ◽  
Ali El Moussati ◽  
...  
Keyword(s):  
Spectral Range ◽  
Transfer Functions ◽  
Free Spectral Range ◽  
Vernier Effect ◽  
Multiband Filter

Optimizing laser triangulation displacement sensor of 3D positioning and posture using COA Based BPNN

Sensor Review ◽  
2020 ◽  
Vol 40 (1) ◽  
pp. 112-120
Author(s):  
Yassine Selami ◽  
Na Lv ◽  
Wei Tao ◽  
Hongwei Yang ◽  
Hui Zhao
Keyword(s):  
Mathematical Model ◽  
Measuring System ◽  
Displacement Sensor ◽  
Laser Triangulation ◽  
Content Type ◽  
Depth Measurement ◽  
Displacement Sensors ◽  
Wide Range ◽  
3D Positioning ◽  
The Mathematical Model

Purpose The purpose of this paper is to propose cuckoo optimization algorithm (COA)-based back propagation neural network (BPNN) to reduce the effect of the nonlinearities presented in laser triangulation displacement sensors. The 3D positioning and posture sensor allows access to the third dimension through depth measurement; the performance of the sensor varies according to the level of nonlinearities presented in the system, which leads to inaccuracies in measurement. Design/methodology/approach While applying optimization approach, the mathematical model and the relationship between the key parameters in the laser triangulation ranging and the indexes of the measuring system were analyzed. Findings Based on the performance of the parametric optimization method, the measurement repeatability reached 0.5 µm with an STD value within 0.17 µm, an expanded uncertainty of measurement was within 5 µm, the angle error variation of the object’s rotational plane was within 0.031 degrees and nonlinearity was recorded within 0.006 per cent in a full scale. The proposed approach reduced the effect of the nonlinearity presented in the sensor. Thus, the accuracy and speed of the sensor were greatly increased. The specifications of the optimized sensor meet the requirements for high-accuracy devices and allow wide range of industrial application. Originality/value In this paper, COA-based BPNN is proposed for laser triangulation displacement sensor optimization, on the basis of the mathematical model, clarifying the working space and working angle on the measurement system.

scholarly journals Temperature Sensor Based on Periodically Tapered Optical Fibers

Sensors ◽  
2021 ◽  
Vol 21 (24) ◽  
pp. 8358
Author(s):  
Bartlomiej Guzowski ◽  
Mateusz Łakomski
Keyword(s):  
Linear Function ◽  
Optical Fibers ◽  
Spectral Range ◽  
Temperature Sensor ◽  
Simple Structure ◽  
Free Spectral Range ◽  
Temperature Response ◽  
Temperature Range ◽  
Fabrication And Characterization

In this paper, the fabrication and characterization of a temperature sensor based on periodically tapered optical fibers (PTOF) are presented. The relation between the geometry of the sensors and sensing ability was investigated in order to find the relatively simple structure of a sensor. Four types of PTOF structures with two, four, six and eight waists were manufactured with the fusion splicer. For each PTOF type, the theoretical free spectral range (FSR) was calculated and compared with measurements. The experiments were conducted for a temperature range of 20–70 °C. The results proved that the number of the tapered regions in PTOF is crucial, because some of the investigated structures did not exhibit the temperature response. The interference occurring inside the structures with two and four waists was found be too weak and, therefore, the transmission dip was hardly visible. We proved that sensors with a low number of tapered regions cannot be considered as a temperature sensor. Sufficiently more valuable results were obtained for the last two types of PTOF, where the sensor’s sensitivity was equal to 0.07 dB/°C with an excellent linear fitting (R2 > 0.99). The transmission dip shift can be described by a linear function (R2 > 0.97) with a slope α > 0.39 nm/°C.

scholarly journals Melt-Spun Photoluminescent Polymer Optical Fibers for Color-Tunable Textile Illumination

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1740
Author(s):  
Konrad Jakubowski ◽  
Manfred Heuberger ◽  
Rudolf Hufenus
Keyword(s):  
Energy Transfer ◽  
Optical Fibers ◽  
Color Space ◽  
Emission Spectra ◽  
Wide Range ◽  
Color Tunable ◽  
Melt Spun ◽  
Polymer Optical Fibers ◽  
Collective Emission ◽  
Down Conversion

The increasing interest in luminescent waveguides, applied as light concentrators, sensing elements, or decorative illuminating systems, is fostering efforts to further expand their functionality. Yarns and textiles based on a combination of distinct melt-spun polymer optical fibers (POFs), doped with individual luminescent dyes, can be beneficial for such applications since they enable easy tuning of the color of emitted light. Based on the energy transfer occurring between differently dyed filaments within a yarn or textile, the collective emission properties of such assemblies are adjustable over a wide range. The presented study demonstrates this effect using multicolor, meltspun, and photoluminescent POFs to measure their superimposed photoluminescent emission spectra. By varying the concentration of luminophores in yarn and fabric composition, the overall color of the resulting photoluminescent textiles can be tailored by the recapturing of light escaping from individual POFs. The ensuing color space is a mean to address the needs of specific applications, such as decorative elements and textile illumination by UV down-conversion.

Dispersion properties of single-mode optical fibers in telecommunication region: poly (methyl methacrylate) (PMMA) versus silica

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hassan Pakarzadeh ◽  
Seyed Mostafa Rezaei ◽  
Mostafa Taghizadeh ◽  
Forough Bozorgzadeh
Keyword(s):  
Methyl Methacrylate ◽  
Optical Fibers ◽  
Spectral Range ◽  
Structural Parameters ◽  
Practical Importance ◽  
Single Mode ◽  
Dispersion Characteristics ◽  
Poly Methyl Methacrylate ◽  
Dispersion Wavelength ◽  
Zero Dispersion Wavelength

AbstractIn this paper, the dispersion characteristics of two standard single-mode optical fibers (SMFs), fabricated with silica and poly (methyl methacrylate) (PMMA) are studied in telecommunication spectral regions. The effect of structural parameters, such as the radius of the fiber core and the relative core-cladding index difference, is numerically investigated. It is found that over whole spectral range, the PMMA-based SMF shows lower dispersion than the silica SMF. Also, the zero-dispersion wavelength (ZDW) of PMMA-based SMF is longer than that of silica fiber. The results may be of practical importance for the telecommunication applications.

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