TY  - CONF
AU  - Ivanović, Marija D.
AU  - Petrović, Jovana S.
AU  - Miletić, Marjan
AU  - Daničić, Aleksandar
AU  - Bojović, Boško
AU  - Vukcevic, M.
AU  - Lazovic, B.
AU  - Gluvić, Zoran
AU  - Hadžievski, Ljupčo
AU  - Allsop, Thomas P.
AU  - Webb, David J.
PY  - 2015
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7097
AB  - Non-invasive ventilation performed through an oronasal mask is a standard in clinical and homecare mechanical ventilation. Besides all its advantages, inevitable leaks through the mask cause errors in the feedback information provided by the airflow sensor and, hence, patient-ventilator asynchrony with multiple negative consequences. Here we investigate a new way to provide a trigger to the ventilator. The method is based on the measurement of rib cage movement at the onset of inspiration and during breathing by fibre-optic sensors. In a series of simultaneous measurements by a long-period fibre grating sensor and pneumotachograph we provide the statistical evidence of the 200 ms lag of the pneumo with respect the fibre-optic signal. The lag is registered consistently across three independent delay metrics. Further, we discuss exceptions from this trend and identify the needed improvements to the proposed fibre-sensing scheme.
T1  - Rib-Cage-Movement Measurements as a Potential New Trigger Signal in Non-Invasive Mechanical Ventilation
SP  - 4511
EP  - 4514
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7097
ER  - 

@conference{
author = "Ivanović, Marija D. and Petrović, Jovana S. and Miletić, Marjan and Daničić, Aleksandar and Bojović, Boško and Vukcevic, M. and Lazovic, B. and Gluvić, Zoran and Hadžievski, Ljupčo and Allsop, Thomas P. and Webb, David J.",
year = "2015",
abstract = "Non-invasive ventilation performed through an oronasal mask is a standard in clinical and homecare mechanical ventilation. Besides all its advantages, inevitable leaks through the mask cause errors in the feedback information provided by the airflow sensor and, hence, patient-ventilator asynchrony with multiple negative consequences. Here we investigate a new way to provide a trigger to the ventilator. The method is based on the measurement of rib cage movement at the onset of inspiration and during breathing by fibre-optic sensors. In a series of simultaneous measurements by a long-period fibre grating sensor and pneumotachograph we provide the statistical evidence of the 200 ms lag of the pneumo with respect the fibre-optic signal. The lag is registered consistently across three independent delay metrics. Further, we discuss exceptions from this trend and identify the needed improvements to the proposed fibre-sensing scheme.",
title = "Rib-Cage-Movement Measurements as a Potential New Trigger Signal in Non-Invasive Mechanical Ventilation",
pages = "4511-4514",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7097"
}

Ivanović, M. D., Petrović, J. S., Miletić, M., Daničić, A., Bojović, B., Vukcevic, M., Lazovic, B., Gluvić, Z., Hadžievski, L., Allsop, T. P.,& Webb, D. J.. (2015). Rib-Cage-Movement Measurements as a Potential New Trigger Signal in Non-Invasive Mechanical Ventilation. , 4511-4514.
https://hdl.handle.net/21.15107/rcub_vinar_7097

Ivanović MD, Petrović JS, Miletić M, Daničić A, Bojović B, Vukcevic M, Lazovic B, Gluvić Z, Hadžievski L, Allsop TP, Webb DJ. Rib-Cage-Movement Measurements as a Potential New Trigger Signal in Non-Invasive Mechanical Ventilation. 2015;:4511-4514.
https://hdl.handle.net/21.15107/rcub_vinar_7097 .

Ivanović, Marija D., Petrović, Jovana S., Miletić, Marjan, Daničić, Aleksandar, Bojović, Boško, Vukcevic, M., Lazovic, B., Gluvić, Zoran, Hadžievski, Ljupčo, Allsop, Thomas P., Webb, David J., "Rib-Cage-Movement Measurements as a Potential New Trigger Signal in Non-Invasive Mechanical Ventilation" (2015):4511-4514,
https://hdl.handle.net/21.15107/rcub_vinar_7097 .

TY  - JOUR
AU  - Petrovic, M. D.
AU  - Petrović, Jovana S.
AU  - Daničić, Aleksandar
AU  - Vukcevic, M.
AU  - Bojović, Boško
AU  - Hadžievski, Ljupčo
AU  - Allsop, Thomas P.
AU  - Lloyd, G.
AU  - Webb, David J.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/5946
AB  - In non-invasive ventilation, continuous monitoring of respiratory volumes is essential. Here, we present a method for the measurement of respiratory volumes by a single fiber-grating sensor of bending and provide the proof-of-principle by applying a calibration-test measurement procedure on a set of 18 healthy volunteers. Results establish a linear correlation between a change in lung volume and the corresponding change in a local thorax curvature. They also show good sensor accuracy in measurements of tidal and minute respiratory volumes for different types of breathing. The proposed technique does not rely on the air flow through an oronasal mask or the observation of chest movement by a clinician, which distinguishes it from the current clinical practice. (C) 2014 Optical Society of America
T2  - Biomedical Optics Express
T1  - Non-invasive respiratory monitoring using long-period fiber grating sensors
VL  - 5
IS  - 4
SP  - 1136
EP  - 1144
DO  - 10.1364/BOE.5.001136
ER  - 

@article{
author = "Petrovic, M. D. and Petrović, Jovana S. and Daničić, Aleksandar and Vukcevic, M. and Bojović, Boško and Hadžievski, Ljupčo and Allsop, Thomas P. and Lloyd, G. and Webb, David J.",
year = "2014",
abstract = "In non-invasive ventilation, continuous monitoring of respiratory volumes is essential. Here, we present a method for the measurement of respiratory volumes by a single fiber-grating sensor of bending and provide the proof-of-principle by applying a calibration-test measurement procedure on a set of 18 healthy volunteers. Results establish a linear correlation between a change in lung volume and the corresponding change in a local thorax curvature. They also show good sensor accuracy in measurements of tidal and minute respiratory volumes for different types of breathing. The proposed technique does not rely on the air flow through an oronasal mask or the observation of chest movement by a clinician, which distinguishes it from the current clinical practice. (C) 2014 Optical Society of America",
journal = "Biomedical Optics Express",
title = "Non-invasive respiratory monitoring using long-period fiber grating sensors",
volume = "5",
number = "4",
pages = "1136-1144",
doi = "10.1364/BOE.5.001136"
}

Petrovic, M. D., Petrović, J. S., Daničić, A., Vukcevic, M., Bojović, B., Hadžievski, L., Allsop, T. P., Lloyd, G.,& Webb, D. J.. (2014). Non-invasive respiratory monitoring using long-period fiber grating sensors. in Biomedical Optics Express, 5(4), 1136-1144.
https://doi.org/10.1364/BOE.5.001136

Petrovic MD, Petrović JS, Daničić A, Vukcevic M, Bojović B, Hadžievski L, Allsop TP, Lloyd G, Webb DJ. Non-invasive respiratory monitoring using long-period fiber grating sensors. in Biomedical Optics Express. 2014;5(4):1136-1144.
doi:10.1364/BOE.5.001136 .

Petrovic, M. D., Petrović, Jovana S., Daničić, Aleksandar, Vukcevic, M., Bojović, Boško, Hadžievski, Ljupčo, Allsop, Thomas P., Lloyd, G., Webb, David J., "Non-invasive respiratory monitoring using long-period fiber grating sensors" in Biomedical Optics Express, 5, no. 4 (2014):1136-1144,
https://doi.org/10.1364/BOE.5.001136 . .

TY  - CONF
AU  - Allsop, Thomas P.
AU  - Lloyd, G.
AU  - Bhamber, R. S.
AU  - Hadžievski, Ljupčo
AU  - Halliday, M.
AU  - Webb, David J.
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7054
AB  - Cardiovascular health of the human population is a major concern for medical clinicians, with cardiovascular diseases responsible for 48% of all deaths worldwide, according to the World Health Organisation. Therefore the development of new practicable and economical diagnostic tools to scrutinise the cardiovascular health of humans is a major driver for clinicians. We offer a new technique to obtain seismocardiographic signals covering both ballistocardiography (below 20Hz) and audible heart sounds (20Hz upwards). The detection scheme is based upon an array of curvature/displacement sensors using fibre optic long period gratings interrogated using a variation of the derivative spectroscopy interrogation technique
T1  - Cardiac induced localised motion of the human torso detected by a long period grating fibre optic sensing scheme
VL  - 9157
DO  - 10.1117/12.2059089
ER  - 

@conference{
author = "Allsop, Thomas P. and Lloyd, G. and Bhamber, R. S. and Hadžievski, Ljupčo and Halliday, M. and Webb, David J.",
year = "2014",
abstract = "Cardiovascular health of the human population is a major concern for medical clinicians, with cardiovascular diseases responsible for 48% of all deaths worldwide, according to the World Health Organisation. Therefore the development of new practicable and economical diagnostic tools to scrutinise the cardiovascular health of humans is a major driver for clinicians. We offer a new technique to obtain seismocardiographic signals covering both ballistocardiography (below 20Hz) and audible heart sounds (20Hz upwards). The detection scheme is based upon an array of curvature/displacement sensors using fibre optic long period gratings interrogated using a variation of the derivative spectroscopy interrogation technique",
title = "Cardiac induced localised motion of the human torso detected by a long period grating fibre optic sensing scheme",
volume = "9157",
doi = "10.1117/12.2059089"
}

Allsop, T. P., Lloyd, G., Bhamber, R. S., Hadžievski, L., Halliday, M.,& Webb, D. J.. (2014). Cardiac induced localised motion of the human torso detected by a long period grating fibre optic sensing scheme. , 9157.
https://doi.org/10.1117/12.2059089

Allsop TP, Lloyd G, Bhamber RS, Hadžievski L, Halliday M, Webb DJ. Cardiac induced localised motion of the human torso detected by a long period grating fibre optic sensing scheme. 2014;9157.
doi:10.1117/12.2059089 .

Allsop, Thomas P., Lloyd, G., Bhamber, R. S., Hadžievski, Ljupčo, Halliday, M., Webb, David J., "Cardiac induced localised motion of the human torso detected by a long period grating fibre optic sensing scheme", 9157 (2014),
https://doi.org/10.1117/12.2059089 . .

TY  - JOUR
AU  - Allsop, Thomas P.
AU  - Lloyd, Glynn
AU  - Bhamber, Ranjeet S.
AU  - Hadžievski, Ljupčo
AU  - Halliday, Michael
AU  - Webb, David J.
AU  - Bennion, Ian
PY  - 2014
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/337
AB  - The cardiovascular health of the human population is a major concern for medical clinicians, with cardiovascular diseases responsible for 48% of all deaths worldwide, according to the World Health Organization. The development of new diagnostic tools that are practicable and economical to scrutinize the cardiovascular health of humans is a major driver for clinicians. We offer a new technique to obtain seismocardiographic signals up to 54 Hz covering both ballistocardiography (below 20 Hz) and audible heart sounds (20 Hz upward), using a system based on curvature sensors formed from fiber optic long period gratings. This system can visualize the real-time three-dimensional (3-D) mechanical motion of the heart by using the data from the sensing array in conjunction with a bespoke 3-D shape reconstruction algorithm. Visualization is demonstrated by adhering three to four sensors on the outside of the thorax and in close proximity to the apex of the heart; the sensing scheme revealed a complex motion of the heart wall next to the apex region of the heart. The detection scheme is low-cost, portable, easily operated and has the potential for ambulatory applications. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
T2  - Journal of Biomedical Optics
T1  - Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme
VL  - 19
IS  - 11
DO  - 10.1117/1.JBO.19.11.117006
ER  - 

@article{
author = "Allsop, Thomas P. and Lloyd, Glynn and Bhamber, Ranjeet S. and Hadžievski, Ljupčo and Halliday, Michael and Webb, David J. and Bennion, Ian",
year = "2014",
abstract = "The cardiovascular health of the human population is a major concern for medical clinicians, with cardiovascular diseases responsible for 48% of all deaths worldwide, according to the World Health Organization. The development of new diagnostic tools that are practicable and economical to scrutinize the cardiovascular health of humans is a major driver for clinicians. We offer a new technique to obtain seismocardiographic signals up to 54 Hz covering both ballistocardiography (below 20 Hz) and audible heart sounds (20 Hz upward), using a system based on curvature sensors formed from fiber optic long period gratings. This system can visualize the real-time three-dimensional (3-D) mechanical motion of the heart by using the data from the sensing array in conjunction with a bespoke 3-D shape reconstruction algorithm. Visualization is demonstrated by adhering three to four sensors on the outside of the thorax and in close proximity to the apex of the heart; the sensing scheme revealed a complex motion of the heart wall next to the apex region of the heart. The detection scheme is low-cost, portable, easily operated and has the potential for ambulatory applications. (C) 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)",
journal = "Journal of Biomedical Optics",
title = "Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme",
volume = "19",
number = "11",
doi = "10.1117/1.JBO.19.11.117006"
}

Allsop, T. P., Lloyd, G., Bhamber, R. S., Hadžievski, L., Halliday, M., Webb, D. J.,& Bennion, I.. (2014). Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme. in Journal of Biomedical Optics, 19(11).
https://doi.org/10.1117/1.JBO.19.11.117006

Allsop TP, Lloyd G, Bhamber RS, Hadžievski L, Halliday M, Webb DJ, Bennion I. Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme. in Journal of Biomedical Optics. 2014;19(11).
doi:10.1117/1.JBO.19.11.117006 .

Allsop, Thomas P., Lloyd, Glynn, Bhamber, Ranjeet S., Hadžievski, Ljupčo, Halliday, Michael, Webb, David J., Bennion, Ian, "Cardiac-induced localized thoracic motion detected by a fiber optic sensing scheme" in Journal of Biomedical Optics, 19, no. 11 (2014),
https://doi.org/10.1117/1.JBO.19.11.117006 . .

TY  - JOUR
AU  - Petrović, Marija D.
AU  - Daničić, Aleksandar
AU  - Atanasoski, Vladimir
AU  - Radosavljevic, S.
AU  - Prodanovic, V.
AU  - Miljković, Nadica
AU  - Petrović, Jovana S.
AU  - Petrovic, D.
AU  - Bojović, Boško
AU  - Hadžievski, Ljupčo
AU  - Allsop, Thomas P.
AU  - Lloyd, G.
AU  - Webb, David J.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7019
AB  - Mechanical physiological pulsations are movements of a body surface incited by the movements of muscles in organs inside the body. Here we demonstrate the use of long-period grating sensors in the detection of cardio-vascular pulsations (CVP), in particular apex and carotid pulsations. To calibrate the sensors, we use a mechanical tool designed specifically to measure the sensor response to a localized perturbation at different grating curvatures as working points. From the data we infer the amplitude of the CVP. Together with the electrophysiological signals, the CVP signals obtained from the sensors can provide significant information on heart function which is inaccessible to the electrocardiogram. The low cost and easy handling of the fibre sensors increase their prospects to become the sensors of choice for novel diagnostic devices.
T2  - Physica Scripta
T1  - Fibre-grating sensors for the measurement of physiological pulsations
VL  - T157
SP  - 014022
DO  - 10.1088/0031-8949/2013/T157/014022
ER  - 

@article{
author = "Petrović, Marija D. and Daničić, Aleksandar and Atanasoski, Vladimir and Radosavljevic, S. and Prodanovic, V. and Miljković, Nadica and Petrović, Jovana S. and Petrovic, D. and Bojović, Boško and Hadžievski, Ljupčo and Allsop, Thomas P. and Lloyd, G. and Webb, David J.",
year = "2013",
abstract = "Mechanical physiological pulsations are movements of a body surface incited by the movements of muscles in organs inside the body. Here we demonstrate the use of long-period grating sensors in the detection of cardio-vascular pulsations (CVP), in particular apex and carotid pulsations. To calibrate the sensors, we use a mechanical tool designed specifically to measure the sensor response to a localized perturbation at different grating curvatures as working points. From the data we infer the amplitude of the CVP. Together with the electrophysiological signals, the CVP signals obtained from the sensors can provide significant information on heart function which is inaccessible to the electrocardiogram. The low cost and easy handling of the fibre sensors increase their prospects to become the sensors of choice for novel diagnostic devices.",
journal = "Physica Scripta",
title = "Fibre-grating sensors for the measurement of physiological pulsations",
volume = "T157",
pages = "014022",
doi = "10.1088/0031-8949/2013/T157/014022"
}

Petrović, M. D., Daničić, A., Atanasoski, V., Radosavljevic, S., Prodanovic, V., Miljković, N., Petrović, J. S., Petrovic, D., Bojović, B., Hadžievski, L., Allsop, T. P., Lloyd, G.,& Webb, D. J.. (2013). Fibre-grating sensors for the measurement of physiological pulsations. in Physica Scripta, T157, 014022.
https://doi.org/10.1088/0031-8949/2013/T157/014022

Petrović MD, Daničić A, Atanasoski V, Radosavljevic S, Prodanovic V, Miljković N, Petrović JS, Petrovic D, Bojović B, Hadžievski L, Allsop TP, Lloyd G, Webb DJ. Fibre-grating sensors for the measurement of physiological pulsations. in Physica Scripta. 2013;T157:014022.
doi:10.1088/0031-8949/2013/T157/014022 .

Petrović, Marija D., Daničić, Aleksandar, Atanasoski, Vladimir, Radosavljevic, S., Prodanovic, V., Miljković, Nadica, Petrović, Jovana S., Petrovic, D., Bojović, Boško, Hadžievski, Ljupčo, Allsop, Thomas P., Lloyd, G., Webb, David J., "Fibre-grating sensors for the measurement of physiological pulsations" in Physica Scripta, T157 (2013):014022,
https://doi.org/10.1088/0031-8949/2013/T157/014022 . .

TY  - CONF
AU  - Petrovic, Marija
AU  - Petrović, Jovana S.
AU  - Simic, Goran
AU  - Ilic, Igor
AU  - Daničić, Aleksandar
AU  - Vukcevic, Miodrag
AU  - Bojović, Boško
AU  - Hadžievski, Ljupčo
AU  - Allsop, Thomas P.
AU  - Webb, David J.
PY  - 2013
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/7036
AB  - Respiratory-volume monitoring is an indispensable part of mechanical ventilation. Here we present a new method of the respiratory-volume measurement based on a single fibre-optical long-period sensor of bending and the correlation between torso curvature and lung volume. Unlike the commonly used air-flow based measurement methods the proposed sensor is drift-free and immune to air-leaks. In the paper, we explain the working principle of sensors, a two-step calibration-test measurement procedure and present results that establish a linear correlation between the change in the local thorax curvature and the change of the lung volume. We also discuss the advantages and limitations of these sensors with respect to the current standards.
T1  - A New Method for Respiratory-Volume Monitoring Based on Long-Period Fibre Gratings
SP  - 2660
EP  - 2663
UR  - https://hdl.handle.net/21.15107/rcub_vinar_7036
ER  - 

@conference{
author = "Petrovic, Marija and Petrović, Jovana S. and Simic, Goran and Ilic, Igor and Daničić, Aleksandar and Vukcevic, Miodrag and Bojović, Boško and Hadžievski, Ljupčo and Allsop, Thomas P. and Webb, David J.",
year = "2013",
abstract = "Respiratory-volume monitoring is an indispensable part of mechanical ventilation. Here we present a new method of the respiratory-volume measurement based on a single fibre-optical long-period sensor of bending and the correlation between torso curvature and lung volume. Unlike the commonly used air-flow based measurement methods the proposed sensor is drift-free and immune to air-leaks. In the paper, we explain the working principle of sensors, a two-step calibration-test measurement procedure and present results that establish a linear correlation between the change in the local thorax curvature and the change of the lung volume. We also discuss the advantages and limitations of these sensors with respect to the current standards.",
title = "A New Method for Respiratory-Volume Monitoring Based on Long-Period Fibre Gratings",
pages = "2660-2663",
url = "https://hdl.handle.net/21.15107/rcub_vinar_7036"
}

Petrovic, M., Petrović, J. S., Simic, G., Ilic, I., Daničić, A., Vukcevic, M., Bojović, B., Hadžievski, L., Allsop, T. P.,& Webb, D. J.. (2013). A New Method for Respiratory-Volume Monitoring Based on Long-Period Fibre Gratings. , 2660-2663.
https://hdl.handle.net/21.15107/rcub_vinar_7036

Petrovic M, Petrović JS, Simic G, Ilic I, Daničić A, Vukcevic M, Bojović B, Hadžievski L, Allsop TP, Webb DJ. A New Method for Respiratory-Volume Monitoring Based on Long-Period Fibre Gratings. 2013;:2660-2663.
https://hdl.handle.net/21.15107/rcub_vinar_7036 .

Petrovic, Marija, Petrović, Jovana S., Simic, Goran, Ilic, Igor, Daničić, Aleksandar, Vukcevic, Miodrag, Bojović, Boško, Hadžievski, Ljupčo, Allsop, Thomas P., Webb, David J., "A New Method for Respiratory-Volume Monitoring Based on Long-Period Fibre Gratings" (2013):2660-2663,
https://hdl.handle.net/21.15107/rcub_vinar_7036 .

TY  - JOUR
AU  - Allsop, Thomas P.
AU  - Kalli, Kyriacos
AU  - Zhou, Kaiming
AU  - Smith, Graham N.
AU  - Komodromos, Michael
AU  - Petrović, Jovana S.
AU  - Webb, David J.
AU  - Bennion, Ian
PY  - 2011
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/4469
AB  - The spectral properties of long-period gratings (LPGs) fabricated in photonic crystal fibers using femtosecond laser pulses by the point-by-point technique, without oil-immersion of the fiber, are investigated in detail. Postfabrication spectral monitoring at room temperature showed significant long-term instability of the gratings and stable spectra only after 600 h. The stabilized spectral properties of the gratings improved with increasing annealing temperature. The observed changes in resonant wavelength, optical strength, and grating birefringence were correlated to the laser inscription energy and were further used to study the mechanism of femtosecond inscription. Furthermore, the femtosecond-laser inscribed LPGs were compared to electric-arc fabricated LPGs. Comparison of experimental results with theoretical models of LPGs and laser propagation during inscription indicate that the major processes responsible for the index change are permanent compaction and thermally induced strain, the latter can be significantly changed through annealing. (C) 2011 Optical Society of America
T2  - Journal of the Optical Society of America. B: Optical Physics
T1  - Spectral characteristics and thermal evolution of long-period gratings in photonic crystal fibers fabricated with a near-IR radiation femtosecond laser using point-by-point inscription
VL  - 28
IS  - 9
SP  - 2105
EP  - 2114
DO  - 10.1364/JOSAB.28.002105
ER  - 

@article{
author = "Allsop, Thomas P. and Kalli, Kyriacos and Zhou, Kaiming and Smith, Graham N. and Komodromos, Michael and Petrović, Jovana S. and Webb, David J. and Bennion, Ian",
year = "2011",
abstract = "The spectral properties of long-period gratings (LPGs) fabricated in photonic crystal fibers using femtosecond laser pulses by the point-by-point technique, without oil-immersion of the fiber, are investigated in detail. Postfabrication spectral monitoring at room temperature showed significant long-term instability of the gratings and stable spectra only after 600 h. The stabilized spectral properties of the gratings improved with increasing annealing temperature. The observed changes in resonant wavelength, optical strength, and grating birefringence were correlated to the laser inscription energy and were further used to study the mechanism of femtosecond inscription. Furthermore, the femtosecond-laser inscribed LPGs were compared to electric-arc fabricated LPGs. Comparison of experimental results with theoretical models of LPGs and laser propagation during inscription indicate that the major processes responsible for the index change are permanent compaction and thermally induced strain, the latter can be significantly changed through annealing. (C) 2011 Optical Society of America",
journal = "Journal of the Optical Society of America. B: Optical Physics",
title = "Spectral characteristics and thermal evolution of long-period gratings in photonic crystal fibers fabricated with a near-IR radiation femtosecond laser using point-by-point inscription",
volume = "28",
number = "9",
pages = "2105-2114",
doi = "10.1364/JOSAB.28.002105"
}

Allsop, T. P., Kalli, K., Zhou, K., Smith, G. N., Komodromos, M., Petrović, J. S., Webb, D. J.,& Bennion, I.. (2011). Spectral characteristics and thermal evolution of long-period gratings in photonic crystal fibers fabricated with a near-IR radiation femtosecond laser using point-by-point inscription. in Journal of the Optical Society of America. B: Optical Physics, 28(9), 2105-2114.
https://doi.org/10.1364/JOSAB.28.002105

Allsop TP, Kalli K, Zhou K, Smith GN, Komodromos M, Petrović JS, Webb DJ, Bennion I. Spectral characteristics and thermal evolution of long-period gratings in photonic crystal fibers fabricated with a near-IR radiation femtosecond laser using point-by-point inscription. in Journal of the Optical Society of America. B: Optical Physics. 2011;28(9):2105-2114.
doi:10.1364/JOSAB.28.002105 .

Allsop, Thomas P., Kalli, Kyriacos, Zhou, Kaiming, Smith, Graham N., Komodromos, Michael, Petrović, Jovana S., Webb, David J., Bennion, Ian, "Spectral characteristics and thermal evolution of long-period gratings in photonic crystal fibers fabricated with a near-IR radiation femtosecond laser using point-by-point inscription" in Journal of the Optical Society of America. B: Optical Physics, 28, no. 9 (2011):2105-2114,
https://doi.org/10.1364/JOSAB.28.002105 . .