&lt;title&gt;Transmission of straight and curved multimode optical fibers&lt;/title&gt;

Melnik, Ivan S.; Kravchenko, Igor; Denisov, Nikolay A.; Dets, Sergiy M.; Rusina, Tatyana V.

doi:10.1117/12.229186

Cited by 2 publications

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“…2), the rays traveling closer to the cladding will likely escape into the adjacent cladding region and eventually into the air due to the bend. The loss of a single bend in a large core multimode optical fiber can be calculated by analyzing the propagation of the evanescent waves of the higher order modes in its cladding [13], or by ray tracing [14]. For the optical inputs and pickups, 1 mWatt light emitting diodes (LED) ( nm) and light-to-voltage optical sensors (TSL250, made by Texas Instruments Incorporated) were used.…”

Section: Methodsmentioning

confidence: 99%

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Huang

Wang

et al. 2007

IEEE Sensors J.

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A composite optical bend loss sensor for measuring 3-D forces has been developed. The sensor is composed of two optic fiber meshes which are embedded into a polydimethylsiloxane (PDMS) slab. The sensor consists of an array of optical fibers lying in perpendicular rows and columns sandwiched inside an elastomeric pad. A map of normal and shear stress is constructed based on observed macrobending through the intensity attenuation from physical deformation of two adjacent perpendicular fibers. Due to the new addition of the composite design and acrylic holder, the stability of the present sensor is found to be significantly better than our previously reported microfabricated optical bend loss sensor. In this paper, we will report the results of an optical bend loss simulation using the beam propagation method based on a series of images captured by a CCD camera on the fiber's bending curvatures. The result from the simulation will be compared with the results obtained from the experiment. Other results include vertical force and shear measurements at a single pressure point of the sensor. A force image algorithm is used to map the force distribution detected by the sensor. Here, we will present the results of six different shape patterns and two force magnitudes on each shape using a neural network system. We will also present a radio frequency sensor module, which we developed for the composite optical bend loss sensor for remote sensing.Index Terms-Bend loss sensor, distributive mechanical sensor, fiber-optic sensor, polydimethylsiloxane (PDMS), pressure sensor, shear sensor.

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Section: Methodsmentioning

confidence: 99%

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Huang

Wang

et al. 2007

IEEE Sensors J.

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“…The loss of a single bend in a large core multimode optical fiber was calculated by analyzing the propagation of the eva-nescent waves of the higher-order modes in the cladding, 13 or by ray tracing. 14 In the current study a fiber optic sensor based on measurement of a single bend loss was used for assessment of respiratory chest circumference changes (RCCC). The measurement of the changes in the light transmitted through the fiber provides a means of assessing the changes in the fiber radius of curvature.…”

Section: Introductionmentioning

confidence: 99%

Fiber Optic Sensor for the Measurement of Respiratory Chest Circumference Changes

et al. 1999

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A fiber optic sensor for the measurement of the respiratory depth has been developed. The sensor is composed of a bent optic fiber which is connected to an elastic section of a chest belt so that its radius of curvature changes during respiration due to respiratory chest circumference changes (RCCC). The measurement of light transmission through the bent fiber provides information on its changes in curvature since a higher fraction of light escapes through the core-cladding surface of a fiber bent to a lower radius of curvature. The sensor can quantitatively measure the RCCC, although in relative terms, and it is sensitive enough to detect changes of the chest circumference due to the heart beat. Measurements of the RCCC were simultaneously performed with photoplethysmography (PPG)-the measurement by light absorption of the cardiac induced blood volume changes in the tissue-and a significant correlation was found between the RCCC and some parameters of the PPG signal. The fiber optic respiratory depth sensor enables a quantitative assessment of the respiratory induced changes in the cardiovascular parameters. © 1999 Society of Photo-Optical Instrumentation Engineers.

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<title>Transmission of straight and curved multimode optical fibers</title>

Cited by 2 publications

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Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Composite Optical Bend Loss Sensor for Pressure and Shear Measurement

Fiber Optic Sensor for the Measurement of Respiratory Chest Circumference Changes

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