- The Photon Science Insitute
Alan Turing Building-3.322
The University of Manchester
Manchester
M13 9PL - 0161 306 8923
- Engineering, Photonics, Instrumentation Engineering, Optical Fiber Communications, Nano Photonics And Nano Electronics, Sensors and Sensing, and 19 moreFiber Optics, Optical Engineering, Instrumentation and Measurement Science, Sensor, Laser Materials Processings - Photonic devices - Nonlinear optics, Optical Measurement Methods, Photonic Crystals, Fiber Optic Sensors, Instrumentation Design, Photonic devices - Nonlinear optics, Photonic Integrated Circuits, Nanostructured Material In Device Fabrication, Short Pulse Laser Propagation in Non-Linear Optical Media, Physiological Optics, Device Technology Physics, Device Physics, Nanotechnology, Instrumentation, and Chemistry(Fiber Optics, Optical Engineering, Instrumentation and Measurement Science, Sensor, Laser Materials Processings - Photonic devices - Nonlinear optics, Optical Measurement Methods, Photonic Crystals, Fiber Optic Sensors, Instrumentation Design, Photonic devices - Nonlinear optics, Photonic Integrated Circuits, Nanostructured Material In Device Fabrication, Short Pulse Laser Propagation in Non-Linear Optical Media, Physiological Optics, Device Technology Physics, Device Physics, Nanotechnology, Instrumentation, and Chemistry)edit
- Research interests: Photonic sensing for environmental, chemical and biological monitoring using polymer photonic mat... moreResearch interests: Photonic sensing for environmental, chemical and biological monitoring using polymer photonic materials and devices, and laser nanostructuring of polymer and metallic materials.
Low cost, rugged sensors have been developed for environmental, chemical and biological monitoring, for applications such as biofouling and scaling, algal growth. pH, particle concentration, turbidity, fluid flow, strain and water toxicity.
Current & Recent Projects
1. Laser microstructuring of polymers for optical devices
2. Biocompatable polymer coatings for biosensors
3. MATINOES: Novel Organic-Inorganic Materials in Opto-Electronic Systems for the Monitoring and Control of Bio-Processes
4. HYPER: Installation permitting guidance for hydrogen and fuel cells stationary applications
5. AQUA-STEW “Water Quality Surveillance Techniques for Early Warning by Interface Sensors”.
6. CLOOPT “On-line measurement for preventing fouling when closing industrial process water circuit”.
Teaching experience: Undergraduate and postgraduate courses in Applied Physics, Optical Science and Technology, Electronic Engineering and Chemical Engineering.
Currently Module Leader for MSc Module Optical Instruments (15 credits) and Second Year Systems Measurement (10 Credits).(Research interests: Photonic sensing for environmental, chemical and biological monitoring using polymer photonic materials and devices, and laser nanostructuring of polymer and metallic materials. <br /> <br />Low cost, rugged sensors have been developed for environmental, chemical and biological monitoring, for applications such as biofouling and scaling, algal growth. pH, particle concentration, turbidity, fluid flow, strain and water toxicity. <br /> <br />Current & Recent Projects <br /> <br />1. Laser microstructuring of polymers for optical devices <br />2. Biocompatable polymer coatings for biosensors <br />3. MATINOES: Novel Organic-Inorganic Materials in Opto-Electronic Systems for the Monitoring and Control of Bio-Processes <br />4. HYPER: Installation permitting guidance for hydrogen and fuel cells stationary applications <br />5. AQUA-STEW “Water Quality Surveillance Techniques for Early Warning by Interface Sensors”. <br />6. CLOOPT “On-line measurement for preventing fouling when closing industrial process water circuit”. <br /> <br />Teaching experience: Undergraduate and postgraduate courses in Applied Physics, Optical Science and Technology, Electronic Engineering and Chemical Engineering. <br />Currently Module Leader for MSc Module Optical Instruments (15 credits) and Second Year Systems Measurement (10 Credits).)edit
This paper discusses results obtained in highspeed laser micro processing of zirconium oxide ceramic and stainless steel. High-PRF (pulse repetition frequency) femtosecond laser systems were joined together with fast galvanometer scanner... more
This paper discusses results obtained in highspeed laser micro processing of zirconium oxide ceramic and stainless steel. High-PRF (pulse repetition frequency) femtosecond laser systems were joined together with fast galvanometer scanner systems. A high average laser power (31.7 W) and fast scan speeds (17.1 m/s) were applied in order to increase material removal. The influence of average laser power, laser energy and repetition rate on both the volume ablation rate and the machining quality was studied. The maximum volume ablation rate for zirconium oxide was 70.3 µm³ per pulse, obtained with pulses of 5.9 µJ energy and 1.02 MHz. It is demonstrated that material removal on zirconium oxide will be strongly affected by heat. Stainless steel was irradiated with a maximum laser power of 31.7 W and various repetition rates. The maximum material removal rate was found to be 6.8 mm³ / min, achieved with laser pulses of 0.85 J/cm² fluence. The feasibility of the highspeed laser technology ...
Presently, only indirect methods exist to monitor protein contamination of polymeric contact lens surfaces. This study, based on a fiber optic sensor, proposes a new quantitative and dynamic measurement technique to address this problem.... more
Presently, only indirect methods exist to monitor protein contamination of polymeric contact lens surfaces. This study, based on a fiber optic sensor, proposes a new quantitative and dynamic measurement technique to address this problem. Comparative contamination studies on three representative proteins: γ globulin, bovine serum albumin (BSA) and ovalbumin (molecular weight 240,000, 60,000 and 45,000), using a new tensiographic method, have been developed for a polymethylmethacrylate (PMMA) substrate.
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ABSTRACT We demonstrate the performance of a Guided-Path Tomography (GPT) sensor element, based on photonic technology, as part of a sensor head for tomography imaging of physical parameters on non-planar and possibly flexible surfaces.... more
ABSTRACT We demonstrate the performance of a Guided-Path Tomography (GPT) sensor element, based on photonic technology, as part of a sensor head for tomography imaging of physical parameters on non-planar and possibly flexible surfaces. Novel in our approach is to image by measuring the waveguiding loss along a set of plastic optical fiber (POF) sensor elements, strategically arranged on the imaged surface, to allow tomography measurements and image reconstruction. To image small changes in the local surface curvature, the POF elements are sensitized by cutting transversal grooves along the fiber. The losses induced by bending the POF element are systematically studied for varying groove depth and for varying number of grooves, allowing the definition of calibration procedures as well as the operation envelope of the POF sensor and ultimately-the tomography imager. The mechanical integrity of the grooved POF sensor elements is demonstrated in experiments of controlled repetitive bending, representative of realistic conditions.
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Research Interests: Chemistry, Doping, Annealing, Refractive Index, Absorption, and 2 morePolarization and Apertures(Polarization and Apertures)
(Polarization and Apertures)
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In many outdoor locations solar radiation provides the greatest power densities from energy harvesting for wireless sensor networks in comparison to other practical alternative such as wind, vibrations or temperature gradients. Since... more
In many outdoor locations solar radiation provides the greatest power densities from energy harvesting for wireless sensor networks in comparison to other practical alternative such as wind, vibrations or temperature gradients. Since solar power is highly variable with location and time, it is necessary to optimise the sensor nodes for individual locations. Presented here, is an assessment of the solar power availability in Manchester, UK (53°28′N, 2°14′W). Wireless sensor nodes are typically low power devices with intended perpetual operation and thus the temporal distribution of available power is important together with the total amount of energy drawn over a given time period. Here we examine direct and diffuse solar radiation data over a period of three years and present methods for the deployment of solar cells for sensor nodes to optimise sensing and communication scenarios. As local weather conditions are highly variable and stochastic in the medium term, we base the future ...
The use of Fibre Bragg Grating sensors to study the setting expansion of dental materials like resin based composites and gypsum is reported. Temperature and strain evolution during the hardening phase of the material are obtained.©... more
The use of Fibre Bragg Grating sensors to study the setting expansion of dental materials like resin based composites and gypsum is reported. Temperature and strain evolution during the hardening phase of the material are obtained.© (2005) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
ABSTRACT A femtosecond laser writes 3D nanoscale photonic structures in a single step, overcoming material, dimensional, refractive-index, and wavelength constraints.
Spatial mapping of photo-chemical and optical density changes in polymethyl methacrylate formed by direct femtosecond laser writing of photonic structures at 180fs, 387nm and 44fs, 800 nm at 1kHz repetition rate is demonstrated. Results... more
Spatial mapping of photo-chemical and optical density changes in polymethyl methacrylate formed by direct femtosecond laser writing of photonic structures at 180fs, 387nm and 44fs, 800 nm at 1kHz repetition rate is demonstrated. Results show variations in the monomer content and intensity of background scattering light in the substructure.
A compact, ruggedized fiber optic IR reflectance probe for remote, in-situ screening of underground waste sites has been developed. Using cabled chalcogenide optical fibers and a FTIR system, remote spectroscopy has been performed over... more
A compact, ruggedized fiber optic IR reflectance probe for remote, in-situ screening of underground waste sites has been developed. Using cabled chalcogenide optical fibers and a FTIR system, remote spectroscopy has been performed over distances of 20 meters. This paper discusses the design and performance of this system.© (1995) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
ABSTRACT We report on the concept, sensing principles, hardware and software implementation, as well as the performance of a demonstrator smart carpet, suitable for integration into the everyday environment. The deformation-induced... more
ABSTRACT We report on the concept, sensing principles, hardware and software implementation, as well as the performance of a demonstrator smart carpet, suitable for integration into the everyday environment. The deformation-induced transmission losses through strategically placed optical fiber sensing elements are measured and images of the footprints of objects in the imaged scene are reconstructed by an original method suitable for the limited datasets acquired. We discuss the potential for a very compact system, easy to integrate with the living environment and the outside world.
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... 104-113. N. Bom, H. Hoff, CT Lancee, "Early and recent intraluminal ultra-sound devices," Int. J. of Card. Imag. 4, 79-88 (1989). ... The Page 2. 266 1 CLEO/EUROPE'94 1 WEDNESDAY AFTERNOON calibration curves are... more
... 104-113. N. Bom, H. Hoff, CT Lancee, "Early and recent intraluminal ultra-sound devices," Int. J. of Card. Imag. 4, 79-88 (1989). ... The Page 2. 266 1 CLEO/EUROPE'94 1 WEDNESDAY AFTERNOON calibration curves are independent of tis-sue bed site and skin pigmentation. ...
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... A large diameter plastic multimode declad sensing fibre was exposed to recirculated 1 ... time damage detection in a thermoplastic-based composite material using multi-mode optical fibre sensor. ... fiber sensor for biofilm... more
... A large diameter plastic multimode declad sensing fibre was exposed to recirculated 1 ... time damage detection in a thermoplastic-based composite material using multi-mode optical fibre sensor. ... fiber sensor for biofilm measurement using intensity modulation and image analysis. ...
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We present the design, development and performance characteristics of an optical fibre drag-force flow sensor to measure the speed and direction of fluid flow. Multidirectional fluid flow measurement is made possible by vectorial addition... more
We present the design, development and performance characteristics of an optical fibre drag-force flow sensor to measure the speed and direction of fluid flow. Multidirectional fluid flow measurement is made possible by vectorial addition of the orthogonal flow components. The flow sensor comprises a fibre optic strain gauge developed by the authors, a cantilever-deflecting element made of rubber, and a drag element. The fibre optic strain gauge was designed and developed by inserting grooves into a multimode plastic optical fibre. As the fibre bends, the variation in the angle of the grooves causes an intensity modulation of the light transmitted through the fibre. The flow sensor has a repeatability of 0.3%, negligible hysteresis, and measures the wind velocity up to 30 m s-1 with a magnitude resolution of 1.4 m s-1 and a direction resolution of 5.9. The flow sensor would be ideally suited for industrial and environmental applications.
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ABSTRACT The concept of distributed pH measurement was demonstrated at a sensitized region 4 m from the distal end of a 20 m length of plastic optical fibre. The cladding was removed from the fibre over 150 mm and the bare core was... more
ABSTRACT The concept of distributed pH measurement was demonstrated at a sensitized region 4 m from the distal end of a 20 m length of plastic optical fibre. The cladding was removed from the fibre over 150 mm and the bare core was exposed to an aqueous solution of methyl red at three values of pH, between 2.89 and 9.70. The optical fibre was interrogated at 648 nm using a Luciol photon counting optical time domain reflectometer, showing the sensing region was attenuated as a function of pH. Least-squares analysis of the traces yielded the linear equation Y = -1.35 pH + 11.4 with a correlation coefficient of -0.96 indicating a high degree of correlation, permitting pH measurement to an estimated ±1.0 pH at the sensing region. Chemical sensing measurements by photon counting OTDR using a standard PCS fibre in aqueous (0.0010 M) and ethanolic (0.000 65 M) solutions of methyl red at 657 nm are also presented. The ingress of methyl red in ethanol was detectable after 2 h and showed reversibility to the pre-doped condition in under 7 min. A case for a silicone resin clad PMMA core hybrid optical fibre as a chemical or pH sensor is presented. This paper was presented at the 13th International Conference on Sensors and Their Applications, held in Chatham, Kent, on 6-7 September 2005.
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ABSTRACT We introduce theoretically and demonstrate experimentally the performance of a Guided-Path Tomography sensor head and a complete system for imaging of physical parameters on non-planar and possibly flexible surfaces. Novel in our... more
ABSTRACT We introduce theoretically and demonstrate experimentally the performance of a Guided-Path Tomography sensor head and a complete system for imaging of physical parameters on non-planar and possibly flexible surfaces. Novel in our approach is to employ waveguiding sensor elements, strategically arranged on the imaged surface, to allow tomography measurements and the inverse problem solution. In the reported particular implementation we image deformation over ~1sq.m., which is achieved by sensitizing the sensor elements to bending. The problem of severely limited number of measurements is addressed by an original method for sinogram recovery, followed by the application of well established methods for solving the hard-field tomography inverse problem. We show that the sensor is capable of distinguishing objects of different mass and shape of footprint. It also calculates the coordinates of the centre of mass of the imaged objects, which facilitates integration with control systems.