Hypolito José Kalinowski
Federal Fluminense University
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Publication
Featured researches published by Hypolito José Kalinowski.
Measurement Science and Technology | 2001
Günther Wehrle; Percy Nohama; Hypolito José Kalinowski; Pedro Ignacio Torres; Luiz Carlos Guedes Valente
A fibre optic Bragg grating sensor to measure the strain in the chest of patients is described. The sensor provides a new method to measure ventilatory movements and it can also determine the respiratory frequency spectrum. The apparatus uses a fixed optical filter reference scheme to reduce the overall cost and is able to detect respiratory movements with frequency components up to 10 Hz. Ventilatory signals were acquired from slow breathing, with 500 ml inspiration volume, to fast, with a reduced volume of 60 ml, respiration. The sensor described here can be used to trigger the pulse burst of electrically assisted ventilation processes or to monitor high frequency oscillatory ventilation.
Measurement Science and Technology | 2004
Ilda Abe; Hypolito José Kalinowski; Orlando Frazão; J. L. Santos; Rogério N. Nogueira; João L. Pinto
We used a pair of Bragg gratings written in high birefringence fibre optics to measure, simultaneously, longitudinal and transverse strain and temperature. The Bragg gratings are superimposed in the same position of the fibre optic, so as to behave as a punctual sensor. The sensitivity of the spectral response of the device to longitudinal strain, transverse strain and temperature are all characterized, and the results of its application as a three-parameter sensor are also presented.
Sensors | 2011
Lucas Hermann Negri; Ademir Nied; Hypolito José Kalinowski; Aleksander S. Paterno
This paper presents a benchmark for peak detection algorithms employed in fiber Bragg grating spectrometric interrogation systems. The accuracy, precision, and computational performance of currently used algorithms and those of a new proposed artificial neural network algorithm are compared. Centroid and gaussian fitting algorithms are shown to have the highest precision but produce systematic errors that depend on the FBG refractive index modulation profile. The proposed neural network displays relatively good precision with reduced systematic errors and improved computational performance when compared to other networks. Additionally, suitable algorithms may be chosen with the general guidelines presented.
Measurement Science and Technology | 2006
Ilda Abe; Orlando Frazão; Marcelo W. Schiller; Rogério N. Nogueira; Hypolito José Kalinowski; João L. Pinto
Fibre optic Bragg gratings (FBGs) written in normal and reduced diameter high birefringence (HiBi) fibres are studied. Chemical etching is used to reduce the diameter of fibres while the optical properties of the FBG spectrum are measured. The results obtained agree qualitatively with the stress enhanced chemical etching. The birefringence of the fibre is determined as a function of the diameter. Optical characterization of the FBG under transverse strain and temperature is also performed. The results obtained show the feasibility of the simultaneous measurement of those parameters with a HiBi FBG sensor.
Journal of Strain Analysis for Engineering Design | 2006
Lídia Carvalho; Jean Carlos Cardozo da Silva; Rogério N. Nogueira; João L. Pinto; Hypolito José Kalinowski; J. A Simúes
This paper describes the use of fibre Bragg grating (FBG) sensors to measure strains at a mandible surface that are caused by static or impact loads on a dental implant. The measuring apparatus uses a fixed optical filter reference scheme and is able to detect dynamic signals with frequency components of up to 10 kHz. A dried implanted cadaveric mandible was used with strain gauges and FBG sensors placed at the outer surface in the direction of the longitudinal axis of the implant. The implants were loaded statically and dynamically and uniaxial strains recorded. The study demonstrates the ability of the FBG as a biomechanical sensor.
Química Nova | 2007
Rosane Falate; Karen Nike; Pedro Ramos da Costa Neto; Eduardo Cação Jr.; Marcia Muller; Hypolito José Kalinowski; José Luís Fabris
We report the use of an optical fiber sensor to measure the soybean oil concentration in samples obtained from the mixture of pure biodiesel and commercial soybean oil. The operation of the device is based on the long-period grating sensitivity to the surrounding medium refractive index, which leads to measurable modifications in the grating transmission spectrum. The proposed analysis method results in errors in the oil concentration of 0.4% and 2.6% for pure biodiesel and commercial soybean oil, respectively. Techniques of total glycerol, dynamic viscosity, density, and hydrogen nuclear magnetic resonance spectroscopy were also employed to validate the proposed method.
IEEE Sensors Journal | 2006
Aleksander S. Paterno; V. de Oliveira; T.S. Figueredo; Hypolito José Kalinowski
This paper describes the use of a mechanically modulated fiber Bragg grating (FBG) to address FBG sensors using the tunable-filter method. A demonstration of FBG sensors multiplexing using this interrogation method is also presented, where the tunable FBG is used to scan the spectral operating range of the sensors. All the FBG used in this paper do not need to match their center wavelengths
Measurement Science and Technology | 2006
Maura S. Milczewski; J C C da Silva; Ilda Abe; Leonardo Souza de Carvalho; Rogério N. Nogueira; Aleksander S. Paterno; Hypolito José Kalinowski; João L. Pinto
The use of fibre Bragg grating sensors to study dental materials like resin-based composite and gypsum products is reported. Two commercially available composite resins and three types of gypsum products were tested in order to determine polymerization contraction and setting expansion. Temperature and strain evolution during the hardening phase of the material were also obtained. The presented technique can be a good tool for dentists in order to better manipulate a material and predict how it will behave in vivo.
Optics Express | 2012
Alexandre Felipe; Guilherme Espíndola; Hypolito José Kalinowski; José A. S. Lima; Aleksander S. Paterno
This work reports a modified flame-brush technique to fabricate fiber tapers with arbitrary waist profiles. The flame-brush approach is used to produce small step reductions in the fiber diameter, or step-tapers, with a constant speed flame brush sweep, while the fiber is uniformly stretched. Arbitrary waist profiles in tapers are fabricated by approximating the taper diameter function to any monotonic function of the fiber length while combining a superposition of step-tapers. This method to produce the arbitrary profiles is described and a set of tapers with dissimilar transition regions are fabricated for its validation.
Journal of Biomaterials Science-polymer Edition | 2007
M. S. Milczewski; Jean Carlos Cardozo da Silva; Aleksander S. Paterno; Fabiano Kuller; Hypolito José Kalinowski
Fibre Bragg grating is used to determine resin-based composite shrinkage. Two composite resins (Freedom from SDI and Z100 from 3M) were tested to determine the polymerization contraction behaviour. Each sample of resin was prepared with an embedded fibre Bragg grating. A LED activation unit with wavelength from 430 nm to 470 nm (Dabi Atlante) was used for resin polymerization. The wavelength position of the peak in the optical reflection spectra of the sensor was measured. The wavelength shift was related to the shrinkage deformation of the samples. Temperature and strain evolution during the curing phase of the material was monitored. The shrinkage in the longitudinal direction was 0.15 ± 0.02% for resin Z100 (3M) and 0.06±0.01% for Freedom (SDI); two-thirds of shrinkage occurred after the first 50 s of illumination.
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Dive into the Hypolito José Kalinowski's collaboration.
Ana Paula Gebert de Oliveira Franco
Federal University of Technology - Paraná
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