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1
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Content available

Polarimetric Fiber Optic System for Static and Dynamic Strain Measurement

100%
Konopka W., Woliński T., Domański A., Karpierz M.
Acta Physica Polonica A
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2001
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vol. 99
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issue 1
207-213
EN
Polarization properties of the transmitted optical signal in polarimetric fiber-optic sensing systems for dynamic strain measurements as well as for smart structures applications are presented. The smart structure consists of highly birefringent fiber embedded in an epoxy cylinder.
2
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Low-Coherence Fibre-Optic Interferometric Sensors

100%
Jedrzejewska-Szczerska M., Gnyba M., Kosmowski B.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
621-624
EN
In this paper low-coherence fibre-optic sensors based on the Fabry-Perot and Michelson interferometer, which were designed and elaborated at our laboratory, are shown. We present results of investigation of the fibre-optic sensors working in both configurations. These results allowed us to compare properties of sensors working in both configurations. The theoretical analysis and experimental results made us possible to select best construction, which was implemented in low-coherence fibre-optic sensors of refractive index.
3
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Optical Investigation of Hematocrit Level in Human Blood

100%
Jedrzejewska-Szczerska M., Gnyba M.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
642-646
EN
In this paper use of selected optical methods of a hematocrit measurement has been presented. Elaborated methods have numerous advantages: relatively simple configurations, potentially low cost and high resolution. Investigation confirmed their ability to determine the hematocrit value with appropriate measurement accuracy. Furthermore, simultaneous use of complementary optical methods can substantially increase measurement reliability, because low-coherence interferometric measurement is based on physical (mainly optical) properties of the investigated object, while Raman spectroscopy is based on study of its molecular composition.
4
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Extrinsic Optical Fiber Sensor for Medical Audiometric Applications

100%
Prokopczuk K., Poczęsny T., Sobotka P., Domański A.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
957-961
EN
The paper presents optical fiber sensor designed for medical audiometric measurements. Currently, highly precise audiometric examinations require attachment of reflective element inside the ear. We propose alternative contactless optical and non-invasive method for audiometric applications. Presented sensor utilizes extrinsic intensity modulation combined with interferometric method to measure low amplitude vibrations with flat frequency response curve and no resonance effects. Experiment was performed with tympanic membrane model stimulated by external loudspeaker. Experimental results show usage possibility of presented sensor for laryngological and audiometric tests of ear membrane response, which is important for both diagnosis and implants sensitivity fitting for people with hearing deficits.
5
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The Fiber-Optic Sensor for the Museum Collections Protection

100%
Życzkowski M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
933-937
EN
The article describes the operation's rule of the fiber optic sensor in the modalmetric configuration. This type of sensor is described by comparatively simple construction, while retaining other features of fiber-optic sensors such as high sensitivity. This gives a very high potential application. In the paper possible application of the modalmetric sensor to protection of works of art and museum collections is presented. The advantage of its use is the ability to tie the fiber in structure of material. Moreover, the advantage of such type a sensor compared to existing solutions of security sensors is the reaction for vibration and touch. The paper presents the concept and results of the system optimization.
6
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Improved Methods of Signal Processing Used in Low-Coherent Systems

100%
Jedrzejewska-Szczerska M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-127-A-131
EN
In this article the author presents improved techniques of signal processing used in low-coherent measurement systems. The author proposes to utilize the synthesized sources in the system with the temporal signal processing. It will be shown that the exploit of such a source can substantially reduce the signal-to-noise ratio required to identify the central fringe position. In case of using spectral signal processing, the author proposes to control the position of maximum in the spectral pattern which modifies the phase difference between interfering beams. The results of experimental works will show that described techniques can be an effective method for improving the signal processing in low-coherent measurement systems.
7
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A New Fiber Optic Spring

100%
Yaltkaya S.
Acta Physica Polonica A
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2014
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vol. 125
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issue 2
635-637
EN
Optical sensors have attracted considerable attention in recent decades. Springs are used for a large variety of functions in industry including in sensor applications such as the measurement of force, acceleration, vibration, and pressure. In this study, a compression coiled spring and an optical fiber cable were combined to form a new optical fiber spring. The measurement part of the fiber optic spring was constructed by using a 3 dB fiber coupler and a fiber polarization beam splitter/combiner. During the study, a diode laser was used and silicon detectors measured the variations of the polarization state intensity. The spring constant of the optical fiber spring was obtained from decay of the free vibrations and Hooke's law. In conclusion, the new constructed fiber optic spring can be used in some industrial sensor applications.
8
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The New Sensing Fibre for Application in Optical Fibre Current Sensor

80%
Barczak K., Pustelny T., Dorosz D., Dorosz J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-3-A-6
EN
The present paper deals with investigations concerning optical fibre current sensors. They are mainly applied in measurements of the intensity of the electric current in the power lines as so-called optical transformers of the electrical current. The most important advantages of fibre current sensors are: safety of service, insulating power as well as their insensitiveness to electromagnetic interference. The investigations were concentrated on designing of adequate sensing fibre, and particularly on the choice of an adequate kind of glass, of which this fibre could be made. Besides, also the head of the fibre current sensor was designed, basing on the suggested and produced sensing fibre. The paper presents the results of magneto-optic tests of the glass and the sensing fibre.
9
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A Novel Electrically Tunable Long-Period Fiber Grating Using a Liquid Crystal Cladding Layer

80%
Czapla A., Woliński T., Nowinowski-Kruszelnicki E., Bock W.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1104-1107
EN
The main aim of the presented work is the integration of a long-period fiber grating and a liquid crystal into a hybrid structure, in order to develop an innovative fiber optic device controlled by an external electric field. The studied long-period fiber grating was fabricated using UV irradiation in a boron co-doped fiber (PS1250/1500, manufactured by Fibercore). As a liquid crystal we used a typical 5CB nematic liquid crystal. The sensing mechanism of the proposed loss filter relies on long-period fiber grating attenuation bands sensitivity to optical properties of the liquid crystal layer. The results obtained show that the long-period fiber grating with a nanosized liquid crystal layer exhibits one order of magnitude higher electrical sensitivity and a lower level of the voltage control than the long-period fiber grating with a micro-sized liquid crystal layer.
10
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Photo-Induced Orientation of Nematic Liquid Crystals in Microcapillaries

80%
Chychłowski M., Ertman S., Tefelska M., Woliński T., Nowinowski-Kruszelnicki E., Yaroshchuk O.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1100-1103
EN
Axial and transversal orientational configurations of a nematic liquid crystal 6CHBT are realized inside glassy cylindrical capillaries by using photoalignment technique. It is demonstrated that this principle can be effectively used to enforce liquid crystal alignment in the desirable direction. It can be applied to control liquid crystal alignment in the photonic crystal fibers showing great potential for the modern telecommunication technologies.
11
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Capillary Microfluidic Sensor for Determining the Most Fertile Period in Cows

80%
Borecki M., Korwin-Pawlowski M., Bebłowska M., Szmidt M., Urbańska K., Kalenik J., Chudzian Ł., Szczepański Z., Kopczyński K., Jakubowski A., Szmidt A.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1093-1099
EN
This paper presents a new method of optoelectronic determination of cow fertility, based on a microfluidic fiber-optic capillary sensor. The current state of the art of fiber-optic capillary sensors is discussed briefly along with aspects of instrumentation and applications. Unlike classical fiber-optic sensors which are based on changes in light propagation inside the fiber in response to external conditions, optical capillary sensors rely on changes of light transmission within capillaries filled with the liquid to be analyzed. This approach opens up interesting new possibilities for the application of capillary microfluidic sensors, while raising specific issues relating to their construction, materials and technology. The investigated sensor uses light switching forced by local heating in a capillary filled with bovine vaginal fluid. The dynamically recorded data were processed in an artificial neural network. We were able to observe changes in the cow's fertility cycle allowing us to identify when an individual cow was in the middle part of standing estrus which is most situated for insemination.
12
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Integrated System for Heading Determination

80%
Kaniewski P., Kazubek J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 3
325-330
EN
The paper presents a design and a prototype of integrated system, designed for heading determination of land vehicles. The heading is an angle between the North direction (true or magnetic) and the direction of longitudal axis of a vehicle in the horizontal plane. In land vehicle positioning and navigation, for most of the time the heading can be considered the same as the direction of movement of the vehicle. Thus, it can be used, along with information about the linear displacement of the vehicle, for dead reckoning, i.e. calculation of current vehicle position by accumulating position increments from a known initial location. The determination of vehicle heading represents a key function of dead reckoning and significantly influences the accuracy of land vehicle positioning. Each of the angular sensors, commonly used for heading determination, has serious drawbacks and joint processing of data from several devices can be advantageous. The paper contains a short description of operation, properties and error characteristics of gyros and electronic compasses, which are frequently applied in heading determination application. Further part of the paper presents a design of integrated system, composed of the above mentioned devices. The system processes navigation data with use of a single complementary Kalman filter. A prototype of the designed system has been constructed and tested by the authors. The paper contains a detailed description of the prototype and chosen results of its testing.
13
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Modalmetric Fiber Optic Sensor for Security of Collections

80%
Życzkowski M.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 3
428-431
EN
The main aim of the work is the integration of modalmetric sensor in one arm. The proposed sensor is a classical fiber optic cable whose measuring arm is upgraded with multimode sensor. The aim of the research is to assess the impact of modal changes for detection of mechanical disturbances and comparative assessment of detection capabilities of interferometer sensor, modalmetric sensor, and hybrid sensor for different types of excitations. The measurements concerns the area of fundamental research. The results can be used in the construction of sensors with corresponding characteristics and properties, especially to protect museum collections.
14
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Hollow-Core Bragg Fiber for Bio-Sensing Applications

80%
Mileńko K., Hu D., Shum P., Woliński T.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1205-1208
EN
Theoretical analysis of propagation properties in a hollow-core Bragg fiber for bio-sensing applications has been demonstrated. Based on the Bragg fiber we propose a resonant sensor that operates on changes in refractive index of aqueous solution placed inside the hollow core. By using the transfer matrix method we analyzed the confinement loss of the TE_{01} mode in the hollow-core Bragg fiber. We have shown the influence of the fiber geometry on the changes in the confinement loss. Spectral sensitivity and resolution of the sensor are also presented.
15
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Investigations of SAW Structures with Oxide Graphene Layer to Detection of Selected Gases

80%
Drewniak S., Pustelny T., Setkiewicz M., Maciak E., Urbańczyk M., Procek M., Opilski Z., Jagiello J., Lipinska L.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
402-405
EN
In this paper we present the results of investigations of graphene oxide layers using the SAW structure (structure with surface acoustic wave propagated) exposed to the affect of low concentrations of hydrogen and nitrogen dioxide in synthetic air. During the measurements, the differential signal (from two measuring channels) was recorded. The sensing graphene oxide layer was deposited only on first channel, whereas the second channel was not covered by any additional layer. The tests were made with various concentrations of the analyzed gases and at various temperatures of the sensing structure during the measurements. Analyses were performed with special emphasis on the time response of the sensor structure to changes in the gas atmosphere.
16
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Polarimetric Optical Fiber Sensors for Dynamic Strain Measurement in Composite Materials

80%
Domański A., Bieda M., Lesiak P., Makowski P., Szeląg M., Poczęsny T., Prokopczuk K., Sobotka P., Chychłowski M., Sierakowski M., Woliński T.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
399-401
EN
Polarimetric optical fiber sensors possess possibility of temperature compensation, dynamic and integral system of strain monitoring, as well as low cost of photo-detecting elements. In the paper we present results of the sensor analysis with different kinds of birefringent optical fibers leading to an optimal setup for dynamic strain monitoring in composite materials. A great attention is put on parameters of the light sources like coherence and width of spectrum and their influence on dynamics of the strain sensor.
17
Content available remote

Spectral Tuning of the Long-Period Fiber Gratings by Using Low Birefringence Liquid Crystals

80%
Czapla A., Bock W., Woliński T., Dąbrowski R., Nowinowski-Kruszelnicki E.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
589-592
EN
The work presented in this paper is focused on investigation of the spectral properties of the long-period fiber gratings combined with the liquid crystals, named liquid crystal long-period fiber gratings. The experiments carried out showed that the proposed designs of the liquid crystal long-period fiber gratings can offer very interesting spectral properties and can introduce a new level of sensitivity. In particular, a high-efficiency thermal tuning of the long-period fiber gratings coated with low-birefringence liquid crystal layers could be achieved and gave rise to a fast and wide switching ability of the attenuation bands within their transmission spectrum.
18
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Influence of Angular Orientation of the Embedded Highly Birefringent Fiber on PMD Changes under Axial Stress

80%
Budaszewski D., Lesiak P., Plaga R., Rajan G., Semenova Y., Farrell G., Boczkowska A., Domański A., Woliński T.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
575-578
EN
In the paper we present results of the research on polarization mode dispersion changes inside the polarimetric optical fiber sensors based on highly birefringent optical fibers embedded into composite materials with different angular orientations of the optical axes. Based on measurements made for different types of highly birefringent optical fiber sensors we have shown that strain sensitivities after lamination process are different in comparison to the data obtained before lamination. Our results indicate that polarization mode dispersion in side-hole highly birefringent fibers under axial stress strongly depends on fiber orientation in the composite material suggesting that orientation of the polarization axes of the highly birefringent fiber can be responsible for behavior of the fiber inside the composite material.
19
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Externally Liquid-Filled Photonic Crystal Fibers with High Output Intensity and Low Confinement Loss

80%
Hosseinpour M., Zendehnam A.
Acta Physica Polonica A
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2017
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vol. 131
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issue 6
1431-1438
EN
In this study, a Gaussian function is used to approximate the output intensity profiles of the externally liquid-filled photonic crystal fibers with various configurations. By decreasing the diameters of the five outer rings of the proposed photonic crystal fibers, the output intensity values are shown to be considerably increased for all of the studied configurations. A very high output intensity value with very low confinement loss (roughly 0 dB/m) can be achieved at λ =1.55 μ m by an appropriate design for the externally liquid-filled PCF with nanostructure.
20
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Single Mode High Refractive Index Optical Fibres

80%
Dorosz D., Barczak K., Pustelny T., Dorosz J.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-63-A-68
EN
The present paper is focussed on the search of technology of new kinds of optical fibers characterised by good magnetooptical properties. The elaborated optical fibres are to apply in optical sensors of electric current and the magnetic field. In result of these researches and analyses a new optical fibre was put forward. Such optical fibers were designed, produced and subjected to extensive tests. This paper presents the results of investigations that were carried out as well as the parameters of the tested structures.
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