Fiber optic displacement sensor with a large extendable measurement range while maintaining equally high sensitivity, linearity, and accuracy

2012 ◽  
Vol 83 (4) ◽  
pp. 045002 ◽  
Author(s):  
Yeon-Gwan Lee ◽  
Yoon-Young Kim ◽  
Chun-Gon Kim
Keyword(s):  
Fiber Optic ◽  
High Sensitivity ◽  
Measurement Range ◽  
Displacement Sensor

scholarly journals High precision machining of a displacement sensor for helicoidal motions

2021 ◽  
Author(s):  
Zeina ELRAWASHDEH ◽  
Philippe REVEL ◽  
Christine PRELLE ◽  
Frédéric LAMARQUE
Keyword(s):  
High Precision ◽  
Fiber Optic ◽  
Geometric Model ◽  
Translational Motion ◽  
Surface Characteristics ◽  
Measurement Range ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Fiber Optic Probes

Abstract This research study presents the design and the high precision manufacture procedure of a fiber-optic displacement sensor. It is composed of two fiber-optic probes associated with a structure of a cones’ grating. The sensor is characterized by its ability to measure the linear displacement for an axis performing a helicoidal motion. This motion has been demonstrated on a high precision lathe; where the spindle provided the rotational motion, associated to a translational motion on the linear stage. This allowed to obtain the two simultaneous motions. The displacement of the translational stage is measured by the sensor in real time.Firstly, a highly precise geometric model of the reflector part for the sensor was developed. This model provided a specific geometry for the cones-assembled grating, which has been precisely manufactured. The geometric parameters and the surface characteristics of each step in the fabricated grating were both identified in situ on the lathe. The agreement between simulation and experimental results is excellent. The performances of the fiber-optic displacement sensor were identified in-situ on the lathe. The analysis of the voltage output signals from the two fiber-optic probes is used to measure the grating displacement. The unbalanced rotation due to non-centered axes was also characterized. The sensor provided a micrometric resolution, on a measurement range of more than one centimeter.

scholarly journals A Bio-Compatible Fiber Optic pH Sensor Based on a Thin Core Interferometric Technique

Photonics ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 11 ◽  
Author(s):  
Magnus Engholm ◽  
Krister Hammarling ◽  
Henrik Andersson ◽  
Mats Sandberg ◽  
Hans-Erik Nilsson
Keyword(s):  
Fiber Optic ◽  
Ph Sensor ◽  
High Sensitivity ◽  
Single Mode ◽  
Measurement Range ◽  
Ph Sensitive ◽  
Fiber Optic Sensor ◽  
Design Parameters ◽  
Sensitive Material ◽  
Interferometric Technique

There is an increasing demand for compact, reliable and versatile sensor concepts for pH-level monitoring within several industrial, chemical as well as bio-medical applications. Many pH sensors concepts have been proposed, however, there is still a need for improved sensor solutions with respect to reliability, durability and miniaturization but also for multiparameter sensing. Here we present a conceptual verification, which includes theoretical simulations as well as experimental evaluation of a fiber optic pH-sensor based on a bio-compatible pH sensitive material not previously used in this context. The fiber optic sensor is based on a Mach-Zehnder interferometric technique, where the pH sensitive material is coated on a short, typically 20-25 mm thin core fiber spliced between two standard single mode fibers. The working principle of the sensor is simulated by using COMSOL Multiphysics. The simulations are used as a guideline for the construction of the sensors that have been experimentally evaluated in different liquids with pH ranging from 1.95 to 11.89. The results are promising, showing the potential for the development of bio-compatible fiber optic pH sensor with short response time, high sensitivity and broad measurement range. The developed sensor concept can find future use in many medical- or bio-chemical applications as well as in environmental monitoring of large areas. Challenges encountered during the sensor development due to variation in the design parameters are discussed.

scholarly journals High sensitivity fiber optic angular displacement sensor and its application for detection of ultrasound

2012 ◽  
Vol 51 (20) ◽  
pp. 4841 ◽  
Author(s):  
João Marcos Salvi Sakamoto ◽  
Cláudio Kitano ◽  
Gefeson Mendes Pacheco ◽  
Bernhard Rainer Tittmann
Keyword(s):  
Fiber Optic ◽  
Angular Displacement ◽  
High Sensitivity ◽  
Displacement Sensor

scholarly journals Concept of an In-Plane Displacement Sensor Based on Grating Interferometry with a Stepwise Change of Sensitivity

Sensors ◽  
2021 ◽  
Vol 21 (14) ◽  
pp. 4894
Author(s):  
Leszek Sałbut ◽  
Sergiusz Łuczak
Keyword(s):  
Spatial Frequency ◽  
Relevant Literature ◽  
High Spatial Frequency ◽  
High Sensitivity ◽  
Measurement Range ◽  
Displacement Sensor ◽  
Special Method ◽  
Stepwise Change ◽  
Low Sensitivity ◽  
Plane Displacement

Grating Interferometry, known in the relevant literature as the High Sensitivity Moiré Interferometry, is a method for in-plane displacement and strain measurement. The sensitivity of this method depends on the spatial frequency of the diffraction grating attached to the object under test. For typical specimen grating, with high spatial frequency of 1200 lines per mm, the basic sensitivity is 0.417 µm per fringe. A concept of in-plane displacement sensor based on Grating Interferometry with a stepwise change in sensitivity is presented. It is realized by using the specimen grating with lower spatial frequency. In this case, the grating has more higher diffraction orders and by selecting them appropriately, the sensitivity (chosen from 1.25 μm, 0.625 μm, or 0.417 μm) and the resulting measurement range (chosen from about 600 μm, 300 μm, or 200 μm) can be adjusted to the requirements of a given experiment. A special method of filtration is required in this case. Achromatic configuration with illumination grating was chosen due to its low sensitivity to vibration.

scholarly journals Geometrical parameter analysis of a high-sensitivity fiber optic angular displacement sensor

2014 ◽  
Vol 53 (36) ◽  
pp. 8436 ◽  
Author(s):  
João M. S. Sakamoto ◽  
Gefeson M. Pacheco ◽  
Cláudio Kitano ◽  
Bernhard R. Tittmann
Keyword(s):  
Geometrical Parameter ◽  
Fiber Optic ◽  
Angular Displacement ◽  
High Sensitivity ◽  
Parameter Analysis ◽  
Displacement Sensor

High-sensitivity fiber optic magnetic field sensor based on lossy mode resonance and hollow core-offset structure

2021 ◽  
pp. 1-12
Author(s):  
Xue-Peng Jin ◽  
Hong-Zhi Sun ◽  
Shuo-Wei Jin ◽  
Wan-Ming Zhao ◽  
Jing-Ren Tang ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Fiber Optic ◽  
High Sensitivity ◽  
Magnetic Field Sensor ◽  
Hollow Core ◽  
Field Sensor

Fiber optic displacement sensor used in railway turnout contact monitoring system

2013 ◽  
Author(s):  
Hongbin Xu ◽  
Wentao Zhang ◽  
Yanliang Du ◽  
Feng Li ◽  
Fang Li
Keyword(s):  
Monitoring System ◽  
Fiber Optic ◽  
Displacement Sensor ◽  
Railway Turnout
Sign in / Sign up

Export Citation Format

Share Document