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  1. Book ; Online: Photonic Technology for Precision Metrology

    Wojtas, Jacek

    2022  

    Keywords Technology: general issues ; History of engineering & technology ; infrared thermometer ; mid-wave infrared ; indium arsenide antimony photodiode ; uncooled thermometer ; fibreoptic coupling ; chopper stabilised op-amp ; zero-drift pre-amplifier ; ammonia detection ; NH3 ; MOX sensors ; polymer sensors ; laser absorption spectroscopy ; CRDS ; CEAS ; MUPASS ; PAS ; HOT IR detectors ; HgCdTe ; P-i-N ; BLIP condition ; 2D material photodetectors ; colloidal quantum dot photodetectors ; low-light photodetectors ; fluorescence microscopy ; time-resolved fluorescence microscopy ; hybrid photodetector (HPD) ; single-molecule fluorescence detection ; fourier ptychography ; image classification ; deep learning ; neural network ; electro-optic modulator ; frequency modulation ; displacement measuring interferometer ; quantum cascade laser ; laser controller ; infrared modulator ; laser spectroscopy ; free space optics ; photonic metrology ; accuracy ; precision ; resolution ; FTIR ; absorption spectroscopy ; gas sensors ; optoelectronic sensors
    Language 0|e
    Size 1 electronic resource (126 pages)
    Publisher MDPI - Multidisciplinary Digital Publishing Institute
    Publishing place Basel
    Document type Book ; Online
    Note English ; Open Access
    HBZ-ID HT021613361
    ISBN 9783036544946 ; 3036544941
    Database ZB MED Catalogue: Medicine, Health, Nutrition, Environment, Agriculture

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  2. Article ; Online: Photonic Technology for Precision Metrology

    Jacek Wojtas

    Applied Sciences, Vol 12, Iss 4022, p

    2022  Volume 4022

    Abstract: Precision metrology is important for understanding and monitoring various phenomena, especially in special and scientific applications. The subject of the article covers selected aspects of the study of high-resolution measurements of the absorption ... ...

    Abstract Precision metrology is important for understanding and monitoring various phenomena, especially in special and scientific applications. The subject of the article covers selected aspects of the study of high-resolution measurements of the absorption spectra and their impact on practical issues. This research is crucial for the development of new systems based on laser absorption spectroscopy methods that can detect trace amounts of matter. Some of the most important parameters describing measuring instruments are also defined and illustrated. Specific examples of measurement results are presented, taking into account the need for the highest possible resolution, accuracy and precision.
    Keywords photonic metrology ; accuracy ; precision ; resolution ; FTIR ; absorption spectroscopy ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Language English
    Publishing date 2022-04-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  3. Article ; Online: Time-Efficient SNR Optimization of WMS-Based Gas Sensor Using a Genetic Algorithm.

    Musiałek, Filip / Szabra, Dariusz / Wojtas, Jacek

    Sensors (Basel, Switzerland)

    2024  Volume 24, Issue 6

    Abstract: This paper presents the description of the wavelength modulation spectroscopy (WMS) experiment, the parameters of which were established by use of the Artificial Intelligence (AI) algorithm. As a result, a significant improvement in the signal power to ... ...

    Abstract This paper presents the description of the wavelength modulation spectroscopy (WMS) experiment, the parameters of which were established by use of the Artificial Intelligence (AI) algorithm. As a result, a significant improvement in the signal power to noise power ratio (SNR) was achieved, ranging from 1.6 to 6.5 times, depending on the harmonic. Typically, optimizing the operation conditions of WMS-based gas sensors is based on long-term simulations, complex mathematical model analysis, and iterative experimental trials. An innovative approach based on a biological-inspired genetic algorithm (GA) and custom-made electronics for laser control is proposed. The experimental setup was equipped with a 31.23 m Heriott multipass cell, software lock-in, and algorithms to control the modulation process of the quantum cascade laser (QCL) operating in the long-wavelength-infrared (LWIR) spectral range. The research results show that the applied evolutionary approach can efficiently and precisely explore a wide range of WMS parameter combinations, enabling researchers to dramatically reduce the time needed to identify optimal settings. It took only 300 s to test approximately 1.39 × 10
    Language English
    Publishing date 2024-03-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s24061842
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Ultraviolet Photodetectors: From Photocathodes to Low-Dimensional Solids.

    Rogalski, Antoni / Bielecki, Zbigniew / Mikołajczyk, Janusz / Wojtas, Jacek

    Sensors (Basel, Switzerland)

    2023  Volume 23, Issue 9

    Abstract: The paper presents the long-term evolution and recent development of ultraviolet photodetectors. First, the general theory of ultraviolet (UV) photodetectors is briefly described. Then the different types of detectors are presented, starting with the ... ...

    Abstract The paper presents the long-term evolution and recent development of ultraviolet photodetectors. First, the general theory of ultraviolet (UV) photodetectors is briefly described. Then the different types of detectors are presented, starting with the older photoemission detectors through photomultipliers and image intensifiers. More attention is paid to silicon and different types of wide band gap semiconductor photodetectors such as AlGaN, SiC-based, and diamond detectors. Additionally, Ga
    Language English
    Publishing date 2023-05-02
    Publishing country Switzerland
    Document type Journal Article ; Review
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s23094452
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Application of Cavity Enhanced Absorption Spectroscopy to the Detection of Nitric Oxide, Carbonyl Sulphide, and Ethane--Breath Biomarkers of Serious Diseases.

    Wojtas, Jacek

    Sensors (Basel, Switzerland)

    2015  Volume 15, Issue 6, Page(s) 14356–14369

    Abstract: The paper presents one of the laser absorption spectroscopy techniques as an effective tool for sensitive analysis of trace gas species in human breath. Characterization of nitric oxide, carbonyl sulphide and ethane, and the selection of their absorption ...

    Abstract The paper presents one of the laser absorption spectroscopy techniques as an effective tool for sensitive analysis of trace gas species in human breath. Characterization of nitric oxide, carbonyl sulphide and ethane, and the selection of their absorption lines are described. Experiments with some biomarkers showed that detection of pathogenic changes at the molecular level is possible using this technique. Thanks to cavity enhanced spectroscopy application, detection limits at the ppb-level and short measurements time (<3 s) were achieved. Absorption lines of reference samples of the selected volatile biomarkers were probed using a distributed feedback quantum cascade laser and a tunable laser system consisting of an optical parametric oscillator and difference frequency generator. Setup using the first source provided a detection limit of 30 ppb for nitric oxide and 250 ppb for carbonyl sulphide. During experiments employing a second laser, detection limits of 0.9 ppb and 0.3 ppb were obtained for carbonyl sulphide and ethane, respectively. The conducted experiments show that this type of diagnosis would significantly increase chances for effective therapy of some diseases. Additionally, it offers non-invasive and real time measurements, high sensitivity and selectivity as well as minimizing discomfort for patients. For that reason, such sensors can be used in screening for early detection of serious diseases.
    MeSH term(s) Biomarkers/analysis ; Breath Tests/methods ; Ethane/analysis ; Humans ; Limit of Detection ; Nitric Oxide/analysis ; Spectrum Analysis/methods ; Sulfur Oxides/analysis
    Chemical Substances Biomarkers ; Sulfur Oxides ; Nitric Oxide (31C4KY9ESH) ; carbonyl sulfide (871UI0ET21) ; Ethane (L99N5N533T)
    Language English
    Publishing date 2015-06-17
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2052857-7
    ISSN 1424-8220 ; 1424-8220
    ISSN (online) 1424-8220
    ISSN 1424-8220
    DOI 10.3390/s150614356
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Application of Cavity Enhanced Absorption Spectroscopy to the Detection of Nitric Oxide, Carbonyl Sulphide, and Ethane—Breath Biomarkers of Serious Diseases

    Jacek Wojtas

    Sensors, Vol 15, Iss 6, Pp 14356-

    2015  Volume 14369

    Abstract: The paper presents one of the laser absorption spectroscopy techniques as an effective tool for sensitive analysis of trace gas species in human breath. Characterization of nitric oxide, carbonyl sulphide and ethane, and the selection of their absorption ...

    Abstract The paper presents one of the laser absorption spectroscopy techniques as an effective tool for sensitive analysis of trace gas species in human breath. Characterization of nitric oxide, carbonyl sulphide and ethane, and the selection of their absorption lines are described. Experiments with some biomarkers showed that detection of pathogenic changes at the molecular level is possible using this technique. Thanks to cavity enhanced spectroscopy application, detection limits at the ppb-level and short measurements time (<3 s) were achieved. Absorption lines of reference samples of the selected volatile biomarkers were probed using a distributed feedback quantum cascade laser and a tunable laser system consisting of an optical parametric oscillator and difference frequency generator. Setup using the first source provided a detection limit of 30 ppb for nitric oxide and 250 ppb for carbonyl sulphide. During experiments employing a second laser, detection limits of 0.9 ppb and 0.3 ppb were obtained for carbonyl sulphide and ethane, respectively. The conducted experiments show that this type of diagnosis would significantly increase chances for effective therapy of some diseases. Additionally, it offers non-invasive and real time measurements, high sensitivity and selectivity as well as minimizing discomfort for patients. For that reason, such sensors can be used in screening for early detection of serious diseases.
    Keywords laser absorption spectroscopy ; cavity enhanced spectroscopy ; CEAS ; gas sensors ; breath analysis ; biomarkers ; nitric oxide ; carbonyl sulphide ; ethane ; QCL ; Technology (General) ; T1-995 ; Technology ; T ; Analytical chemistry ; QD71-142 ; Chemistry ; QD1-999 ; Science ; Q
    Language English
    Publishing date 2015-06-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  7. Article ; Online: stim2b

    Wasilewska, Iga / Gupta, Rishikesh Kumar / Wojtaś, Bartosz / Palchevska, Oksana / Kuźnicki, Jacek

    Cells

    2020  Volume 9, Issue 5

    Abstract: In neurons, stromal interaction molecule (STIM) proteins regulate store-operated ... ...

    Abstract In neurons, stromal interaction molecule (STIM) proteins regulate store-operated Ca
    MeSH term(s) Amino Acid Sequence ; Animals ; Calcium-Binding Proteins/chemistry ; Calcium-Binding Proteins/genetics ; Calcium-Binding Proteins/metabolism ; Gene Expression Profiling ; Gene Expression Regulation, Developmental/radiation effects ; Gene Knockout Techniques ; Glutamic Acid/metabolism ; Larva/radiation effects ; Light Signal Transduction/radiation effects ; Mutation/genetics ; Neurons/metabolism ; Phenotype ; Phototaxis/radiation effects ; Seizures/metabolism ; Zebrafish/genetics ; Zebrafish/metabolism ; Zebrafish Proteins/chemistry ; Zebrafish Proteins/genetics ; Zebrafish Proteins/metabolism ; gamma-Aminobutyric Acid/metabolism
    Chemical Substances Calcium-Binding Proteins ; Zebrafish Proteins ; stim2b protein, zebrafish ; Glutamic Acid (3KX376GY7L) ; gamma-Aminobutyric Acid (56-12-2)
    Language English
    Publishing date 2020-05-21
    Publishing country Switzerland
    Document type Journal Article ; Research Support, Non-U.S. Gov't
    ZDB-ID 2661518-6
    ISSN 2073-4409 ; 2073-4409
    ISSN (online) 2073-4409
    ISSN 2073-4409
    DOI 10.3390/cells9051285
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Changes in Calcium Homeostasis and Gene Expression Implicated in Epilepsy in Hippocampi of Mice Overexpressing

    Majewski, Lukasz / Wojtas, Bartosz / Maciąg, Filip / Kuznicki, Jacek

    International journal of molecular sciences

    2019  Volume 20, Issue 22

    Abstract: Previously, we showed that the overexpression ... ...

    Abstract Previously, we showed that the overexpression of
    MeSH term(s) Animals ; CA1 Region, Hippocampal/metabolism ; Calcium/metabolism ; Epilepsy/genetics ; Female ; Gene Expression Regulation ; Hippocampus/metabolism ; Homeostasis ; Humans ; Mice ; Neurogenesis/genetics ; Neurons/metabolism ; ORAI1 Protein/metabolism ; RNA, Messenger/genetics ; RNA, Messenger/metabolism ; Reproducibility of Results ; Ribonucleoproteins/metabolism ; Ribosomes/metabolism ; Up-Regulation/genetics
    Chemical Substances ORAI1 Protein ; RNA, Messenger ; Ribonucleoproteins ; Calcium (SY7Q814VUP)
    Language English
    Publishing date 2019-11-06
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2019364-6
    ISSN 1422-0067 ; 1422-0067 ; 1661-6596
    ISSN (online) 1422-0067
    ISSN 1422-0067 ; 1661-6596
    DOI 10.3390/ijms20225539
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Ammonia Gas Sensors

    Zbigniew Bielecki / Tadeusz Stacewicz / Janusz Smulko / Jacek Wojtas

    Applied Sciences, Vol 10, Iss 5111, p

    Comparison of Solid-State and Optical Methods

    2020  Volume 5111

    Abstract: High precision and fast measurement of gas concentrations is important for both understanding and monitoring various phenomena, from industrial and environmental to medical and scientific applications. This article deals with the recent progress in ... ...

    Abstract High precision and fast measurement of gas concentrations is important for both understanding and monitoring various phenomena, from industrial and environmental to medical and scientific applications. This article deals with the recent progress in ammonia detection using in-situ solid-state and optical methods. Due to the continuous progress in material engineering and optoelectronic technologies, these methods are among the most perceptive because of their advantages in a specific application. We present the basics of each technique, their performance limits, and the possibility of further development. The practical implementations of representative examples are described in detail. Finally, we present a performance comparison of selected practical application, accumulating data reported over the preceding decade, and conclude from this comparison.
    Keywords ammonia detection ; NH 3 ; MOX sensors ; polymer sensors ; laser absorption spectroscopy ; CRDS ; Technology ; T ; Engineering (General). Civil engineering (General) ; TA1-2040 ; Biology (General) ; QH301-705.5 ; Physics ; QC1-999 ; Chemistry ; QD1-999
    Subject code 621
    Language English
    Publishing date 2020-07-01T00:00:00Z
    Publisher MDPI AG
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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  10. Article ; Online: Mid-infrared, super-flat, supercontinuum generation covering the 2-5 μm spectral band using a fluoroindate fibre pumped with picosecond pulses.

    Michalska, Maria / Mikolajczyk, Janusz / Wojtas, Jacek / Swiderski, Jacek

    Scientific reports

    2016  Volume 6, Page(s) 39138

    Abstract: Broadband, mid-infrared supercontinuum generation in a step-index fluoroindate fibre is reported. By using ~70-picosecond laser pulses at 2.02 μm, provided by an optical parametric generator, a wide spectrum with a cut-off wavelength at 5.25 μm and a 5- ... ...

    Abstract Broadband, mid-infrared supercontinuum generation in a step-index fluoroindate fibre is reported. By using ~70-picosecond laser pulses at 2.02 μm, provided by an optical parametric generator, a wide spectrum with a cut-off wavelength at 5.25 μm and a 5-dB bandwidth covering the entire 2-5 μm spectral interval has been demonstrated for the first time. The behaviour of the supercontinuum was investigated by changing the peak power and the wavelength of the pump pulses. This allowed the optimal pumping conditions to be determined for the nonlinear medium that was used. The optical damage threshold for the fluoroindate fibre was experimentally found to be ~200 GW/cm
    Language English
    Publishing date 2016-12-15
    Publishing country England
    Document type Journal Article
    ZDB-ID 2615211-3
    ISSN 2045-2322 ; 2045-2322
    ISSN (online) 2045-2322
    ISSN 2045-2322
    DOI 10.1038/srep39138
    Database MEDical Literature Analysis and Retrieval System OnLINE

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