A reflective optical sensing technique employing a GRIN rod lens

Cusworth, S.D.; Senior, John M.

doi:10.1088/0022-3735/20/1/021

Cited by 7 publications

(3 citation statements)

References 5 publications

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“…5 . The regression line can be expressed as AL=3.6AV (5) and its linear correlation coefficient r=O. 98.…”

Section: Experiments and Resultsmentioning

confidence: 99%

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Practicable fiber optic displacement sensor with subnanometer resolution

Xu¹

1991

Fiber Optic and Laser Sensors VIII

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A practicable fiber optic displacement sensor with subnanometre resolution is described . It consists of a He-Ne laser source , a directional fiber coupler as a beam splitter , a probe made up of optical fibers and a photodetector setup . Its principle is based on the highly sensitive detection of power change at a " zero " working point in light reflected from an object surface to be measured when the surface is subject to a small displacement . In operation , the probe of sensor carries the incident light to the object surface and receives the reflected light . The probe divides the reflected light into two signals . The two light signals are then transmitted to two photodetectors through the optical fibers . By employing a differential amplifier , we can acquire a highly sensitive displacement signal at the " zero " working point . The result of measurement is not sensitive to the power fluctuation of the light source . The measurement is noncontact . The working range is about 6Oum . The probe is small with diametre less than 5mm . It is also easy for the sensor to be used to measure pressure , strain , vibration , etc

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“…5 . The regression line can be expressed as AL=3.6AV (5) and its linear correlation coefficient r=O. 98.…”

Section: Experiments and Resultsmentioning

confidence: 99%

“…Its wide working range, high accuracy and stability, simplicity and low cost make the sersor practicable. 5 …”

Section: Resultsmentioning

confidence: 99%

Practicable fiber optic displacement sensor with subnanometer resolution

Xu¹

1991

Fiber Optic and Laser Sensors VIII

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“…In the last 30 years, however, many different gradient index materials have been manufactured by ion diffusion, ion-stuffing, sol-gel, CVD techniques and so on [7][8][9][10][11]. The revival of GRIN optics has not been casual and it is connected to a considerable degree with the enormous development of photonics elements mainly for optical communications system, sensing, and micro-optics [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Design of GRIN optical components for coupling and interconnects

Gómez-Reino¹,

Pérez²,

Bao³

et al. 2008

Laser & Photonics Reviews

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This paper reviews the design of some optical systems for coupling and interconnection by GRIN components. The optical systems designed with these components are based on imaging and transforming properties of such components to carry out specific functions. First of all, a brief description of light propagation through GRIN materials will be given. After that, a device to couple light by a GRIN fiber lens into fibers of different core sizes with low loss is described. The coupling efficiency as well as the coupling loss are studied versus variation of the GRIN fiber lens length and the refractive-index profile of the coupler. The design of crossover and parallel interconnects by using a GRIN planar structure will be presented. The optical analysis includes the PSF for describing the performance of the device and the SBP for estimating the numbers of channels that can be handled. The dependence of the number of channels on the wavelength of light and the transverse aperture of the planar interconnect is shown.Spherical GRIN materials: Luneburg (top) and Maxwell's fisheye (bottom) lenses.

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