Zeszyty czasopisma

Tom 15 (2022): Zeszyt 1 (January 2022)

Tom 14 (2021): Zeszyt 1 (January 2021)

Tom 13 (2020): Zeszyt 1 (January 2020)

Tom 12 (2019): Zeszyt 1 (January 2019)

Tom 11 (2018): Zeszyt 1 (January 2018)

Tom 10 (2017): Zeszyt 5 (January 2017)

Tom 10 (2017): Zeszyt 4 (January 2017)

Tom 10 (2017): Zeszyt 3 (January 2017)

Tom 10 (2017): Zeszyt 2 (January 2017)

Tom 10 (2017): Zeszyt 1 (January 2017)

Tom 9 (2016): Zeszyt 4 (January 2016)

Tom 9 (2016): Zeszyt 3 (January 2016)

Tom 9 (2016): Zeszyt 2 (January 2016)

Tom 9 (2016): Zeszyt 1 (January 2016)

Tom 8 (2015): Zeszyt 4 (January 2015)

Tom 8 (2015): Zeszyt 3 (January 2015)

Tom 8 (2015): Zeszyt 2 (January 2015)

Tom 8 (2015): Zeszyt 1 (January 2015)

Tom 7 (2014): Zeszyt 5 (January 2014)

Tom 7 (2014): Zeszyt 4 (January 2014)

Tom 7 (2022): Zeszyt 3 (January 2022)

Tom 7 (2022): Zeszyt 2 (January 2022)

Tom 7 (2014): Zeszyt 1 (January 2014)

Tom 6 (2013): Zeszyt 5 (January 2013)

Tom 6 (2013): Zeszyt 4 (January 2013)

Tom 6 (2013): Zeszyt 3 (January 2013)

Tom 6 (2013): Zeszyt 2 (January 2013)

Tom 6 (2013): Zeszyt 1 (January 2013)

Tom 5 (2012): Zeszyt 4 (January 2012)

Tom 5 (2012): Zeszyt 3 (January 2012)

Tom 5 (2012): Zeszyt 2 (January 2012)

Tom 5 (2012): Zeszyt 1 (January 2012)

Tom 4 (2011): Zeszyt 4 (January 2011)

Tom 4 (2011): Zeszyt 3 (January 2011)

Tom 4 (2011): Zeszyt 2 (January 2011)

Tom 4 (2011): Zeszyt 1 (January 2011)

Tom 3 (2010): Zeszyt 4 (January 2010)

Tom 3 (2010): Zeszyt 3 (January 2010)

Tom 3 (2010): Zeszyt 2 (January 2010)

Tom 3 (2010): Zeszyt 1 (January 2010)

Tom 2 (2009): Zeszyt 4 (January 2009)

Tom 2 (2009): Zeszyt 3 (January 2009)

Tom 2 (2009): Zeszyt 2 (January 2009)

Tom 2 (2009): Zeszyt 1 (January 2009)

Tom 1 (2008): Zeszyt 4 (January 2008)

Tom 1 (2008): Zeszyt 3 (January 2008)

Tom 1 (2008): Zeszyt 2 (January 2008)

Tom 1 (2008): Zeszyt 1 (January 2008)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
1178-5608
Pierwsze wydanie
01 Jan 2008
Częstotliwość wydawania
1 raz w roku
Języki
Angielski

Wyszukiwanie

Tom 2 (2009): Zeszyt 3 (January 2009)

Informacje o czasopiśmie
Format
Czasopismo
eISSN
1178-5608
Pierwsze wydanie
01 Jan 2008
Częstotliwość wydawania
1 raz w roku
Języki
Angielski

Wyszukiwanie

10 Artykułów
access type Otwarty dostęp

One-Shot Three-Dimensional Surface Profilometry using DMD-Based Two-Frequency Moiré and Fourier Transform Technique

Data publikacji: 03 Nov 2017
Zakres stron: 345 - 380

Abstrakt

Abstract

This article presents an optical measurement method for acquiring rapidly accurate geometric 3-D surface morphology of objects. To achieve high-speed profilometry and avoid disturbance due to in-field vibration, one-shot Fourier transform profilometry (FTP) using two- wavelength digital moiré pattern was developed to detect the morphology of the measured object at a speed of up to 60 frames or more per second. Single-fringe interferogram sufficient for FTP can be rapidly captured within a theoretical CCD acquisition time of down to 1 μs. The interferogram thus captured can be applied for further phase retrieving using the developed frequency transform and band-pass filtering strategies. The band-pass filter is designed to obtain phase information for optimizing the 3-D surface reconstruction with both dimensional and structural measurement accuracy. Furthermore, a standard step-height target was measured to analyze accuracy and repeatability of the developed methodology. Experimental results verified that the measurable step height can be effectively increased using the equivalent wavelength established by analyzing two-frequency moiré pattern, thus increasing practical applicability of the developed system while achieving a micro-scale measuring depth resolution. The maximum measured error can be kept within 3.5% of the overall measuring range.

Słowa kluczowe

  • Optical metrology
  • Automatic optical inspection (AOI)
  • Fourier transform
  • Surface profilometry
  • Fourier transform profilometry (FTP)
  • Dynamic measurement
access type Otwarty dostęp

Prediction of Thermal Condition of Cage-Rotor Induction Motors under Non-Standard Supply Systems

Data publikacji: 03 Nov 2017
Zakres stron: 381 - 395

Abstrakt

Abstract

A hybrid thermal model for accurate estimation of thermal condition of cagerotor induction motors under non-standard supply systems has been presented. The developed thermal model is a combination of lumped and distributed thermal parameters which are available from motor dimensions and other physical constants. The thermal condition of the motor under non-standard supply systems such as unbalanced power supply, distorted power supply can be estimated and the necessary derating of the motor can be carried out. The simulated and experimental results are presented.

Słowa kluczowe

  • Thermal model
  • hybrid
  • cage-rotor
  • induction motor
  • distortion
  • harmonics
  • unbalanced supply
  • transient
  • derating
access type Otwarty dostęp

Flow Regime Identification in Pneumatic Conveyor using Electrodynamic Transducer and Fuzzy Logic Method

Data publikacji: 03 Nov 2017
Zakres stron: 396 - 416

Abstrakt

Abstract

Electrodynamic sensor, which can also be called as tribo-electric sensor, senses the electrostatic charge carried by the particle. The tomography system using electrodynamic sensor is called as tribo-electric tomography system. Source of the signal induced on the electrodynamic sensor is brought by the object to be measured and no excitation circuit is necessary. Measuring concentration distribution of the solid particles is essential because it contains useful information about potential problems and further more improve efficiency in the manufacturing or chemical processes. This study proposes to use electrodynamic transducer to measure electrical charge within pneumatic pipeline and utilize the fuzzy logic technique to identify the pattern of flow regimes through pneumatic pipeline. Promising results are obtained through experimental studies.

Słowa kluczowe

  • Pneumatic conveyor
  • electrical charge
  • image reconstruction
  • concentration profile
  • fuzzy logic
  • flow regimes
access type Otwarty dostęp

Simultaneous Periodic Output Feedback Control for Piezoelectric Actuated Structures using Interval Methods

Data publikacji: 03 Nov 2017
Zakres stron: 417 - 431

Abstrakt

Abstract

In this paper, the problem of modeling, output feedback control design and the experimental implementation for the vibration control of smart cantilever beam with parameter uncertainties represented in interval form is addressed. The interval model of the system is obtained by introducing variation in the parameter of the identified model. However, Uncertainties are assumed in the model, identified through on line recursive least square parameter estimation. The control and identification process is done by using Simulink modeling software and dSPACE DS 1104 controller board. The output feedback controller design for the interval model is carried out through simultaneous output feedback controller design methodology by considering lower, nominal and upper bound models. The controllers designed are periodic output feedback is experimentally evaluated for their performance in suppressing the first vibration mode.

Słowa kluczowe

  • Interval analysis
  • output feedback
  • piezoelectric
  • smart structure
access type Otwarty dostęp

Thermal Effects in Design of Integrated CMOS MEMS High Resolution Pressure Sensor

Data publikacji: 03 Nov 2017
Zakres stron: 432 - 447

Abstrakt

Abstract

Thermal effects in integrated piezoresistive MEMS pressure sensor may be a problem of concern in design for applications requiring high precision measurements and in continuously monitoring array of sensor network. It not only results in the shift of the offset voltage of the pressure sensor but also affects the performance of the adjacent CMOS circuit leading to erroneous values. To address this problem, the thermal effects of the integrated sensor chip along with its packaging arising out of the self heating of piezoresistors has been analyzed through a simple heat balance model which has been validated by FEM analysis and laboratory experiment. It is observed that for a typical packaged pressure sensor of 5.6mm by 5.6mm and heat transfer coefficient of 100Wm-2K-1, thermal effect may lead to a temperature rise of around 50C whereas for a high precision application of pressure sensor even 1-20C of temperature rise may lead to significant error. A methodology of co-design and a new MOS library called PTMOS for direct integration of these thermal effects of MEMS piezoresistors in the CMOS circuit has also been presented to reduce considerably the design cycle time of the integrated sensor. This integrated analysis thus helps in proper selection of the dimensions and packaging of the integrated sensor chip taking into account the thermal effects for the optimization of its space constraint and its performance with reduced design cycle time.

Słowa kluczowe

  • Thermal effects
  • MEMS piezoresistive pressure sensor
  • dynamically linked library
  • CMOS MEMS integration
access type Otwarty dostęp

Towards a New Gas Sensor Microsystem Using Electroactive Polymers Thin Films

Data publikacji: 03 Nov 2017
Zakres stron: 448 - 462

Abstrakt

Abstract

This paper describes the development of a new gas sensor device using some electroactive polymers in thin layers. The poly(fluoro-aluminium phthalocyanine) powder, (AlPcF)n, has been synthesized, then deposited by vacuum evaporation on alumina or silicon substrates in the form of thin films with control of the deposition rate. (AlPcF)n thin layers are doped by NO2 or O2 diluted at various concentrations in N2 and their conductivity variations are studied as a function of time, temperature and doping gas concentration. The doping process is reversible, and the experimental results are interpreted in terms of adsorption and diffusion of the gas in the polymer, charge transfer, and transport of the injected carriers in the polymer chain.

These experimental results and previous studies on other polymers and oxidizing gases demonstrate the potentiality of such materials to be used as sensitive part of gas sensors.

Słowa kluczowe

  • Phthalocyanines
  • thin films
  • conductivity variations
  • gas concentration
  • doping
  • adsorption
  • diffusion
  • reversibility
  • charge transfer
  • gas sensor
  • air pollution
access type Otwarty dostęp

Uncertainty Analysis of Micro Differential Pressure Sensor using Interval Analysis

Data publikacji: 03 Nov 2017
Zakres stron: 463 - 476

Abstrakt

Abstract

A methodology for robust design analysis of micromechanical systems using interval methods is presented by considering piezo resistive micro differential pressure sensor with uncertainty in its parameters. The proposed method guides the design of micro sensor to achieve a robust and reliable design in a most efficient way. The uncertainty analysis is carried out numerically using Coventorware and analytically using Intlab.

Słowa kluczowe

  • Uncertainty Analysis
  • Interval Analysis
  • Micro differential Pressure sensor
  • Uncertainty Analysis
  • Coventorware
  • Intlab
access type Otwarty dostęp

Uncertainty Analysis of Strain Gage Circuits: Interval Method And Interval Algorithm

Data publikacji: 03 Nov 2017
Zakres stron: 477 - 489

Abstrakt

Abstract

This paper presents uncertainty analysis of a strain gage based instrumentation systems. This has been carried out by interval method and classical methods and is verified by the mean value algorithm based on interval arithmetic. The quarter, half and full bridge configuration of strain gage based circuits are considered to illustrate the analysis.

Słowa kluczowe

  • Interval analysis
  • Uncertainty analysis
  • Strain gages
  • Interval Optimization
access type Otwarty dostęp

Polymer Optical Fibre for in Situ Monitoring of Gamma Radiation Processes

Data publikacji: 03 Nov 2017
Zakres stron: 490 - 502

Abstrakt

Abstract

Poly Methyl MethAcrylate (PMMA) based plastic optical fibres offer a low cost radiation monitoring solution with a wide dose range, capable of providing real-time, online information. The sensitivity of the fibre to ionising radiation is shown to be dependant on wavelength, with the sensitivity increasing with decreasing wavelength, and so by carefully selecting the monitoring wavelength, the desired sensitivity and dose range can be achieved. The fibres exhibit high sensitivity, up to 0.6dBm−1/kGy, and are capable of monitoring dose ranges between 30Gy and 45kGy. This exceeds the sensing range of all commercially available PMMA slab sensors, allowing it to be used for a wide range of applications.

Słowa kluczowe

  • Radiation dosimetry
  • Plastic Optical Fibres
  • Optical Fibre Sensors
  • radiation processes
access type Otwarty dostęp

Enhanced LPG response characteristics of SnO2 thin film based sensors loaded with Pt clusters

Data publikacji: 03 Nov 2017
Zakres stron: 503 - 514

Abstrakt

Abstract

RF sputtered SnO2 thin films (90 nm thick) loaded with clusters of nanoscale (8 nm) metal catalysts (Pt, Ag, Ni, Pb, Al, Pd) are investigated for LPG detection. SnO2 film loaded with Pt catalyst clusters exhibits enhanced response (~ 7.5×102) to 200 ppm of LPG at a relatively low operating temperature (185oC) with a fast response time of 100s. Variation of thickness of Pt clusters in the nanoscale range (2 to 20 nm) is seen to significantly influence the sensor response characteristics. Enhanced performance is observed for SnO2 thin films loaded with 10 nm thick platinum clusters that exhibited a high response (~ 5 x 103) at an operating temperature, of 220° C. Preliminary results indicate the potential application of prepared sensor structure of Pt clusters (10nm)/SnO2 (90 nm)/IDE/glass substrate for efficient detection of LPG at relatively low temperature.

Słowa kluczowe

  • Gas Sensor
  • Pt clusters-SnO
  • Thin films
  • Sputtering
  • LPG
10 Artykułów
access type Otwarty dostęp

One-Shot Three-Dimensional Surface Profilometry using DMD-Based Two-Frequency Moiré and Fourier Transform Technique

Data publikacji: 03 Nov 2017
Zakres stron: 345 - 380

Abstrakt

Abstract

This article presents an optical measurement method for acquiring rapidly accurate geometric 3-D surface morphology of objects. To achieve high-speed profilometry and avoid disturbance due to in-field vibration, one-shot Fourier transform profilometry (FTP) using two- wavelength digital moiré pattern was developed to detect the morphology of the measured object at a speed of up to 60 frames or more per second. Single-fringe interferogram sufficient for FTP can be rapidly captured within a theoretical CCD acquisition time of down to 1 μs. The interferogram thus captured can be applied for further phase retrieving using the developed frequency transform and band-pass filtering strategies. The band-pass filter is designed to obtain phase information for optimizing the 3-D surface reconstruction with both dimensional and structural measurement accuracy. Furthermore, a standard step-height target was measured to analyze accuracy and repeatability of the developed methodology. Experimental results verified that the measurable step height can be effectively increased using the equivalent wavelength established by analyzing two-frequency moiré pattern, thus increasing practical applicability of the developed system while achieving a micro-scale measuring depth resolution. The maximum measured error can be kept within 3.5% of the overall measuring range.

Słowa kluczowe

  • Optical metrology
  • Automatic optical inspection (AOI)
  • Fourier transform
  • Surface profilometry
  • Fourier transform profilometry (FTP)
  • Dynamic measurement
access type Otwarty dostęp

Prediction of Thermal Condition of Cage-Rotor Induction Motors under Non-Standard Supply Systems

Data publikacji: 03 Nov 2017
Zakres stron: 381 - 395

Abstrakt

Abstract

A hybrid thermal model for accurate estimation of thermal condition of cagerotor induction motors under non-standard supply systems has been presented. The developed thermal model is a combination of lumped and distributed thermal parameters which are available from motor dimensions and other physical constants. The thermal condition of the motor under non-standard supply systems such as unbalanced power supply, distorted power supply can be estimated and the necessary derating of the motor can be carried out. The simulated and experimental results are presented.

Słowa kluczowe

  • Thermal model
  • hybrid
  • cage-rotor
  • induction motor
  • distortion
  • harmonics
  • unbalanced supply
  • transient
  • derating
access type Otwarty dostęp

Flow Regime Identification in Pneumatic Conveyor using Electrodynamic Transducer and Fuzzy Logic Method

Data publikacji: 03 Nov 2017
Zakres stron: 396 - 416

Abstrakt

Abstract

Electrodynamic sensor, which can also be called as tribo-electric sensor, senses the electrostatic charge carried by the particle. The tomography system using electrodynamic sensor is called as tribo-electric tomography system. Source of the signal induced on the electrodynamic sensor is brought by the object to be measured and no excitation circuit is necessary. Measuring concentration distribution of the solid particles is essential because it contains useful information about potential problems and further more improve efficiency in the manufacturing or chemical processes. This study proposes to use electrodynamic transducer to measure electrical charge within pneumatic pipeline and utilize the fuzzy logic technique to identify the pattern of flow regimes through pneumatic pipeline. Promising results are obtained through experimental studies.

Słowa kluczowe

  • Pneumatic conveyor
  • electrical charge
  • image reconstruction
  • concentration profile
  • fuzzy logic
  • flow regimes
access type Otwarty dostęp

Simultaneous Periodic Output Feedback Control for Piezoelectric Actuated Structures using Interval Methods

Data publikacji: 03 Nov 2017
Zakres stron: 417 - 431

Abstrakt

Abstract

In this paper, the problem of modeling, output feedback control design and the experimental implementation for the vibration control of smart cantilever beam with parameter uncertainties represented in interval form is addressed. The interval model of the system is obtained by introducing variation in the parameter of the identified model. However, Uncertainties are assumed in the model, identified through on line recursive least square parameter estimation. The control and identification process is done by using Simulink modeling software and dSPACE DS 1104 controller board. The output feedback controller design for the interval model is carried out through simultaneous output feedback controller design methodology by considering lower, nominal and upper bound models. The controllers designed are periodic output feedback is experimentally evaluated for their performance in suppressing the first vibration mode.

Słowa kluczowe

  • Interval analysis
  • output feedback
  • piezoelectric
  • smart structure
access type Otwarty dostęp

Thermal Effects in Design of Integrated CMOS MEMS High Resolution Pressure Sensor

Data publikacji: 03 Nov 2017
Zakres stron: 432 - 447

Abstrakt

Abstract

Thermal effects in integrated piezoresistive MEMS pressure sensor may be a problem of concern in design for applications requiring high precision measurements and in continuously monitoring array of sensor network. It not only results in the shift of the offset voltage of the pressure sensor but also affects the performance of the adjacent CMOS circuit leading to erroneous values. To address this problem, the thermal effects of the integrated sensor chip along with its packaging arising out of the self heating of piezoresistors has been analyzed through a simple heat balance model which has been validated by FEM analysis and laboratory experiment. It is observed that for a typical packaged pressure sensor of 5.6mm by 5.6mm and heat transfer coefficient of 100Wm-2K-1, thermal effect may lead to a temperature rise of around 50C whereas for a high precision application of pressure sensor even 1-20C of temperature rise may lead to significant error. A methodology of co-design and a new MOS library called PTMOS for direct integration of these thermal effects of MEMS piezoresistors in the CMOS circuit has also been presented to reduce considerably the design cycle time of the integrated sensor. This integrated analysis thus helps in proper selection of the dimensions and packaging of the integrated sensor chip taking into account the thermal effects for the optimization of its space constraint and its performance with reduced design cycle time.

Słowa kluczowe

  • Thermal effects
  • MEMS piezoresistive pressure sensor
  • dynamically linked library
  • CMOS MEMS integration
access type Otwarty dostęp

Towards a New Gas Sensor Microsystem Using Electroactive Polymers Thin Films

Data publikacji: 03 Nov 2017
Zakres stron: 448 - 462

Abstrakt

Abstract

This paper describes the development of a new gas sensor device using some electroactive polymers in thin layers. The poly(fluoro-aluminium phthalocyanine) powder, (AlPcF)n, has been synthesized, then deposited by vacuum evaporation on alumina or silicon substrates in the form of thin films with control of the deposition rate. (AlPcF)n thin layers are doped by NO2 or O2 diluted at various concentrations in N2 and their conductivity variations are studied as a function of time, temperature and doping gas concentration. The doping process is reversible, and the experimental results are interpreted in terms of adsorption and diffusion of the gas in the polymer, charge transfer, and transport of the injected carriers in the polymer chain.

These experimental results and previous studies on other polymers and oxidizing gases demonstrate the potentiality of such materials to be used as sensitive part of gas sensors.

Słowa kluczowe

  • Phthalocyanines
  • thin films
  • conductivity variations
  • gas concentration
  • doping
  • adsorption
  • diffusion
  • reversibility
  • charge transfer
  • gas sensor
  • air pollution
access type Otwarty dostęp

Uncertainty Analysis of Micro Differential Pressure Sensor using Interval Analysis

Data publikacji: 03 Nov 2017
Zakres stron: 463 - 476

Abstrakt

Abstract

A methodology for robust design analysis of micromechanical systems using interval methods is presented by considering piezo resistive micro differential pressure sensor with uncertainty in its parameters. The proposed method guides the design of micro sensor to achieve a robust and reliable design in a most efficient way. The uncertainty analysis is carried out numerically using Coventorware and analytically using Intlab.

Słowa kluczowe

  • Uncertainty Analysis
  • Interval Analysis
  • Micro differential Pressure sensor
  • Uncertainty Analysis
  • Coventorware
  • Intlab
access type Otwarty dostęp

Uncertainty Analysis of Strain Gage Circuits: Interval Method And Interval Algorithm

Data publikacji: 03 Nov 2017
Zakres stron: 477 - 489

Abstrakt

Abstract

This paper presents uncertainty analysis of a strain gage based instrumentation systems. This has been carried out by interval method and classical methods and is verified by the mean value algorithm based on interval arithmetic. The quarter, half and full bridge configuration of strain gage based circuits are considered to illustrate the analysis.

Słowa kluczowe

  • Interval analysis
  • Uncertainty analysis
  • Strain gages
  • Interval Optimization
access type Otwarty dostęp

Polymer Optical Fibre for in Situ Monitoring of Gamma Radiation Processes

Data publikacji: 03 Nov 2017
Zakres stron: 490 - 502

Abstrakt

Abstract

Poly Methyl MethAcrylate (PMMA) based plastic optical fibres offer a low cost radiation monitoring solution with a wide dose range, capable of providing real-time, online information. The sensitivity of the fibre to ionising radiation is shown to be dependant on wavelength, with the sensitivity increasing with decreasing wavelength, and so by carefully selecting the monitoring wavelength, the desired sensitivity and dose range can be achieved. The fibres exhibit high sensitivity, up to 0.6dBm−1/kGy, and are capable of monitoring dose ranges between 30Gy and 45kGy. This exceeds the sensing range of all commercially available PMMA slab sensors, allowing it to be used for a wide range of applications.

Słowa kluczowe

  • Radiation dosimetry
  • Plastic Optical Fibres
  • Optical Fibre Sensors
  • radiation processes
access type Otwarty dostęp

Enhanced LPG response characteristics of SnO2 thin film based sensors loaded with Pt clusters

Data publikacji: 03 Nov 2017
Zakres stron: 503 - 514

Abstrakt

Abstract

RF sputtered SnO2 thin films (90 nm thick) loaded with clusters of nanoscale (8 nm) metal catalysts (Pt, Ag, Ni, Pb, Al, Pd) are investigated for LPG detection. SnO2 film loaded with Pt catalyst clusters exhibits enhanced response (~ 7.5×102) to 200 ppm of LPG at a relatively low operating temperature (185oC) with a fast response time of 100s. Variation of thickness of Pt clusters in the nanoscale range (2 to 20 nm) is seen to significantly influence the sensor response characteristics. Enhanced performance is observed for SnO2 thin films loaded with 10 nm thick platinum clusters that exhibited a high response (~ 5 x 103) at an operating temperature, of 220° C. Preliminary results indicate the potential application of prepared sensor structure of Pt clusters (10nm)/SnO2 (90 nm)/IDE/glass substrate for efficient detection of LPG at relatively low temperature.

Słowa kluczowe

  • Gas Sensor
  • Pt clusters-SnO
  • Thin films
  • Sputtering
  • LPG

Zaplanuj zdalną konferencję ze Sciendo