Multi-wavelength fiber-optic confocal position sensor with diffractive optics for enhanced measurement range

2007 ◽  
Author(s):  
Garry Berkovic ◽  
Ehud Shafir ◽  
Michael A. Golub ◽  
Moshe Bril ◽  
Valery Shurman
Keyword(s):  
Fiber Optic ◽  
Measurement Range ◽  
Diffractive Optics ◽  
Position Sensor ◽  
Multi Wavelength

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.

High-precision fiber-optic position sensor system using ladar techniques

1991 ◽  
Author(s):  
Edward J. Vertatschitsch ◽  
Gregory L. Abbas ◽  
Michael de La Chapelle ◽  
Charles R. Porter
Keyword(s):  
High Precision ◽  
Fiber Optic ◽  
Sensor System ◽  
Position Sensor

Fiber Optic Position Sensor Array

1988 ◽  
Author(s):  
M. Brenci ◽  
G. Conforti ◽  
A.G. Mignani ◽  
A.M. Scheggi
Keyword(s):  
Sensor Array ◽  
Fiber Optic ◽  
Position Sensor

Fiber-Optic Extrinsic Fabry-Perot Interferometer Sensors with Multi-Wavelength Intensity Demodulation

2013 ◽  
Vol 470 ◽  
pp. 630-635 ◽  
Author(s):  
Ning Fang Song ◽  
Rui Qi Cui ◽  
Yu Jie Yang ◽  
Xiao Liang Xu
Keyword(s):  
Incident Wave ◽  
High Speed ◽  
Cavity Length ◽  
Fiber Optic ◽  
Wave Length ◽  
Fabry Perot ◽  
Multiple Wavelengths ◽  
Large Scope ◽  
Multi Wavelength ◽  
Novel Method

In this paper, a novel method used for Fabry-Perot cavity length's demodulation in high-speed and large scope measurement was proposed. Principle of the method is based on uniqueness of intensity of multiple wavelengths in the scope of Fabry-Perot vibration. This technique offers flexibility of selecting incident wave length and enhances the scope of demodulation of cavity length, compared with that popular triple wave length demodulation. In experiment, multi-wavelength demodulation is demonstrated for measurement of cavity length varying from 110um to 115um and the strain resolution was higher than 0.1um.

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