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1
Content available remote

Balance of Polarization in a Hybrid Fiber Optic Sensor

100%
Życzkowski M., Szustakowski M., Markowski P., Karol M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
610-612
EN
This paper presents the effect of light polarization in a hybrid fiber optic sensor. The hybrid sensor is defined as a combination of interferometer sensor and modalmetric sensor. Hybrid sensor system is based on the effect of outputting interferometric sensor of interference as a result of changes made by the modalmetric system. Balance of polarization in the arms of classical interferometer sensor leads to improvement of contrast of interference pattern at the output of the interferometer. Aim of this study is to present a balance light polarization effects in a hybrid system.
2
Content available remote

Physical Properties of Fiber-Optic Sensor in New Dual Configuration

100%
Życzkowski M., Szustakowski M., Markowski P., Karol M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
938-941
EN
The main aim of the work is the integration of two different fiber-optic sensors: the Michelson interferometric sensor, the Mach-Zehnder interferometric, the Sagnac interferometric and modalmetric sensors. The proposed hybrid sensor is a classical interferometer whose measuring arm is upgraded with modalmetric sensor. The theme of research is to assess the impact of modalmetric sensor to interferometer and comparative assessment of detection capabilities of interferometric sensor, modalmetric sensor and hybrid sensor for different types of excitations. The described tests concern the area of basic researches. The results can be used in the construction sensors with corresponding characteristics and properties to the appropriate applications.
3
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Interferometric Fiber Optics Based Sensor for Monitoring of the Heart Activity

100%
Życzkowski M., Szustakowski M., Ciurapiński W., Uziębło-Życzkowska B.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
782-784
EN
The paper presents the concept of the interferometric fiber optic sensor system for human psycho-physical activity detection. A fiber optic sensor utilizes phase changes of propagating light to monitor patient's vital signs such as respiration cardiac activity, blood pressure and body's physical movements.
4
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Hidden Object Detection System Based on Fusion of THz and VIS Images

100%
Kowalski M., Palka N., Piszczek M., Szustakowski M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
490-493
EN
Terahertz imaging makes it possible to acquire images of objects concealed underneath clothing by measuring the radiometric temperatures of different objects on a human subject. Finding objects hidden under clothes is one of key issues of public places security. A possible solution of this problem is a multispectral, terahertz-based screening system with implemented image fusion algorithm. The result of the fusion is a new image which gives more information and is more suitable for human perception. An imaging system is usually composed of various subsystems. Many of the imaging systems use imaging devices working in various spectral ranges. The aim of our studies is to detect and visualize objects hidden under clothing. Detection of potentially dangerous objects is important, but without proper visualization, can be difficult to utilize. Our goal is to build a system harmless to humans for screening and detection of hidden objects using a THz and VIS cameras. The presented system draws attention not only on the properties offered by a single camera but also on the potential of synergetic effects of the system by using the fusion of data registered by different sensor units. In this paper we present the multispectral passive imaging system for hidden threats visualization based on THz and VIS cameras.
5
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Content available

THz spectroscopy of explosive-related simulants and oxidizers

100%
Trzcinski T., Palka N., Szustakowski M.
Bulletin of the Polish Academy of Sciences: Technical Sciences
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2011
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issue 4
6
Content available remote

Multicriterial Analysis of Explosives in the THz Range

100%
Ryniec R., Piszczek M., Szustakowski M.
Acta Physica Polonica A
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2010
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vol. 118
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issue 6
1235-1238
EN
The increasing interest in the development of identification methods of explosives in THz region over the past few years has been observed because of potential terrorist threats. To determine specific spectra properties of materials both possible spectroscopic methods - time domain spectroscopy and Fourier transform infrared spectroscopy are used to analyze different classes of compounds. This paper deals with an identification problem of more than one compound. This task was solved mathematically by means of the following methods: Monte Carlo including principal components analysis methods and analytic methods. Investigations were limited to a detector, which based on a single-frequency quantum dot matrix in 0.3 ÷ 1.3 THz range. The mathematical analysis also includes the atmosphere influence on propagation of THz waves. By means of the presented methods we indicated fourteen optimal frequency points and next we managed to identify one explosive from a set of ten explosives.
7
Content available remote

Coupling in Core-Ring Photonic Crystal Fibers

100%
Palka N., Ciurapiński W., Wojcik J., Szustakowski M.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6A
A-157-A-161
EN
Experimental investigations of light coupling from a core into a ring caused by microbendings in photonic crystal fibres are shown. We present a setup arrangement, mode fields with and without coupling and a plot of power transfer versus localisation of the modulator along the fibre. We also show the most probable explanation of the obtained data.
8
Content available remote

Measurement Stand for TeraEYE Inspection

100%
Piszczek M., Kowalski M., Szustakowski M.
Acta Physica Polonica A
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2011
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vol. 120
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issue 4
720-724
EN
Image fusion can be used as one of imaging methods. Connection of images acquired using different acquisition methods can deliver information invisible for traditional one imaging technique. Visible and thermal images connected in one image give information about shapes and temperature map of objects seen by cameras. If we connect stereoscopic visible image and thermal image we will have three-dimensional object model covered with temperature map. Dividing three-dimensional objects on elementary surfaces we can model this object energetically. Energetic modeling of measurement scene allows verifying measurement data acquired from devices working in terahertz frequency range. This method requires many measurement scene parameters to be registered. Some of these parameters can be used in a hybrid modelling process.
9
Content available remote

Elements of Augmented Reality for Vision Systems

100%
Piszczek M., Zarzycki M., Szustakowski M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
950-953
EN
The purpose of this article is a discussion about the ongoing research at the Institute of Optoelectronics, Military University of Technology. The aim of the research is obtaining the introduction augmented reality elements in vision systems. Technology of augmented reality in connecting with applied sensor sets can strengthen and expand our sensory modalities. The process of data acquisition and processing can be implemented using variable technologies, appropriate for application. At the conclusion we briefly presented two applications currently under tests.
10
Content available remote

Terahertz Spectra of Explosives Measured by Optical Parametric Oscillator-Based System and Time Domain Spectroscopy

100%
Palka N., Trzcinski T., Szustakowski M.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
946-949
EN
In this paper, we report on measurements of absorption spectra of hexogen, penthrite, and octogen. The measurements were carried out by means of time domain spectroscopy and compared to spectra obtained from a setup, which bases on an optical parametric oscillator combined with a Golay cell. For time domain spectroscopy measurement, Teraview TPS 3000 unit with accessories in transmission configuration was used.
11
Content available remote

The Role of a Laser Photography Device Illuminator in Acquisition of Spatial Information

88%
Piszczek M., Kowalski M., Szustakowski M., Rutyna K., Ludwikowski K.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
862-865
EN
The paper is concerned with practical studies of illuminator role in the process of acquisition of spatial information with use of laser photography device. The laser photography device working according to the time-spatial framing method needs both acquisition and illumination process to happen in a very short-time. Fulfillment of both conditions is necessary for proper operation of this device. Using a specialized laser illuminator determines the growth of information potential of the laser photography device and allows reducing parasitic impact of daylight. The presented solution not only improves typical vision systems parameters but it introduces new quality for imaging devices.
12
Content available remote

THz Reflection Spectra of Different Materials, Including Explosives, Measured at a Distance up to 5 m

88%
Walczakowski M., Palka N., Czerwiński A., Sypek M., Szustakowski M.
Acta Physica Polonica A
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2015
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vol. 127
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issue 3
689-692
EN
This work presents a terahertz system designed for the reflection spectroscopy of different materials located at a distance up to 5 m. The source of the radiation is a tunable solid-state optical parametric oscillator, which generates a narrow-band nanosecond pulses in the range of 0.7-2.5 THz. The signal is detected with relatively fast and having big sensitivity hot electron bolometer. The detailed description of each device and the functioning of the experimental setup are provided as well as the methodology of the measurement is explained. Investigations were performed in the 0.7-2.2 THz range in free space with relative humidity of about 40%. The experiment was divided into three series, each of which was carried out with different distance between the examined sample and the system - 1 m, 3 m, and 5 m. Obtained spectra of selected materials, including explosives, are similar to the results received from a purged time domain spectroscopy system. The observed small deviations are connected with fluctuations of the laser wavelength and the instability of the bolometer.
13
Content available remote

Multispectral Systems of Imaging Scenery in Critical Infrastructure Protection, Threat Identification and Recognition

88%
Karol M., Szustakowski M., Życzkowski M., Markowski P., Ciurapiński W.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
459-462
EN
The surveillance system more often uses devices working on different bands that are used not only for detection but also to recognize and identify threats. The paper presents the possibility of protection, detection and identification of risks, achieved through the use of multispectral detection systems in critical infrastructure facilities. The authors consider the benefits of active sensors based on other wavebands, such as millimeter wave radar, terahertz cameras, infrared camera and shows the ability to detect and identify the target using data collected by the sensors. Also discussed the issue of fusion data from different sensors and opportunities that the whole system obtained by application of data fusion.
14
Content available remote

Research and Parameter Optimization of the Infrared Sensor for Eye Track

76%
Życzkowski M., Szustakowski M., Różanowski K., Murawski K., Karol M., Markowski P.
Acta Physica Polonica A
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2012
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vol. 122
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issue 5
942-945
EN
This paper presents infrared sensor for eye tracking system for ophthalmology and truck drivers. System is based on camera and near infrared diode illuminator. We present test results of sensor detection at different operating parameters. Tests were chosen so as to see how the sensor behaves in difficult conditions, additionally tested whether long-term operation of the sensor has an impact on the examined person.
15
Content available remote

Transmission Spectra of Materials in the Terahertz Range Measured by a Hot Electron Bolometer-Based System

76%
Pałka N., Walczakowski M., Zagrajek P., Czerwiński A., Sypek M., Szustakowski M.
Acta Physica Polonica A
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2013
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vol. 124
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issue 3
538-541
EN
This paper presents an optical system for transmission spectral measurements in the terahertz range. The source of radiation is a tunable solid-state laser, which generates a narrow-band nanosecond pulses in the range 0.67-2.68 THz and based on optical parametric oscillator phenomenon. The signal is detected with a fast and sensitive hot electron bolometer. Principle of generation and detection of pulses as well as methodology of measuring spectral characteristics are presented. We compared the results obtained with the free-space setup, which is based on the optical parametric oscillator and hot electron bolometer, with a purged time domain spectroscopy system in the range of 0.7-2.2 THz.
16
Content available remote

Laser Photography Device - Spatial Parameters of Imaging

76%
Piszczek M., Kowalski M., Karol M., Rutyna K., Zarzycki M., Szustakowski M., Ludwikowski K.
Acta Physica Polonica A
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2013
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vol. 124
|
issue 3
550-553
EN
Laser photography device is an imaging device developed in the Institute of Optoelectronics, Military University of Technology and it is an example of modern image acquisition device. The laser photography device allows to define a 3D observation scene thanks to short-time scene illumination and image acquisition method. This device works according to time-spatial framing method. In the paper, basics of time-spatial framing method are explained. Special attention is given to time parameters of device and their influence to spatial parameters of registered images. In this paper the laser photography device and results of chosen experiments are presented and described. Experimental results presented in the paper show the potential and possibilities of using the laser photography device as a camera for observation and measurement applications.
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