Browsing by Author "Tatam, Ralph"
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Item Open Access '2D Spatially-Resolved Depth-Section Microfluidic Flow Velocimetry Using Dual Beam OCT'(Cranfield University, 2020-04-27 15:33) Hallam, Jonathan; Tatam, Ralph; Rigas, Evangelos; Charrett, Tom'Data and associated figures and supplementary materials for '2D Spatially-Resolved Depth-Section Microfluidic Flow Velocimetry Using Dual Beam OCT' published in Micromachines special edition 4th Conference on Microfluidic Handling Systems 2-4th October 2019. Update: 27/04/2020. Added 'requirements.txt' listing exact python packages required and clarified 'readme.txt'.'Item Open Access A long-wave infra-red pulsed external-cavity QCL spectrometer using a hollow waveguide gas cell: Data(Cranfield University, 2024-04-25 08:45) Francis, Daniel; Hodgkinson, Jane; Tatam, RalphA spectrometer built using an external cavity pulsed quantum cascade laser is described. The spectrometer has a tuning range from 10 €“ 13 um (1,000 €“ 769 cm-1) and is designed to target volatile organic compounds (VOCs) which often exhibit water-free molecular absorption within the region. The spectrometer utilizes a hollow silica waveguide gas cell which has an internal volume of a few millilitres, a fast response time (~1 s), and is advantageous when only low sample volumes, similar to the cell volume, are available.Item Open Access All-electronic frequency stabilization of a DFB laser diode(Cranfield University, 2017-05-11 13:27) Asmari, Abdullah|Hodgkinson, Jane; Chehura, Edmon; Staines, Stephen; Tatam, RalphData to support the paper All-electronic frequency stabilization of a DFB laser diode A Asmari, J Hodgkinson, E Chehura, SE Staines and RP Tatam Optics Express 25 (10), 11679-11691, 2017. Doi: 10.1364/OE.25.011679Item Open Access An ammonia sensor based on Lossy Mode Resonances on a tapered optical fibre coated with porphyrin-incorporated titanium dioxide(Cranfield University, 2016-11-28 09:12) Tiwari, Divya; Mullaney, Kevin; James, Stephen; Tatam, RalphData presented in: An ammonia sensor based on Lossy Mode Resonances on a tapered optical fibre coated with porphyrin-incorporated titanium dioxide, Tiwari et al Sensors and Actuators B 2016 - http://dx.doi.org/10.1016/j.snb.2016.11.092 Figure3.xlsx - The transmission spectrum obtained in air and water from a typical 40 µm non-adiabatic (a), a 17 µm non-adiabatic (b), a 40 µm adiabatic (c) and a 17 µm adiabatic (d) tapered optical fibre. Figure 4.zip - transmission spectra of a non-adiabatic tapered optical fibre of waist diameter 17 microns with time and thus increasing thickness of the TMPyP-TiO2 coating. Figure 5_6_7.zip - transmission spectrum of an adiabatic tapered optical fibre of waist diameter 17 microns with time and thus increasing thickness of the TMPyP-TiO2 coating. Figure 8 and 9.zip transmission spectra when an adiabatic tapered optical fibre of diameter 17 microns was immersed in differing concentrations of ammoniaItem Open Access Application of fibre optic sensing systems to measure rotor blade structural dynamics - underlying data(Cranfield University, 2021-03-12 09:17) James, Stephen; Kissinger, Thomas; Tatam, Ralph; Barrington, James; Chehura, Edmon; Weber, Simone; Mullaney, Kevin; Zanotti Fragonara, Luca; Petrunin, Ivan; Staines, StephenRefer to the paper for full details. Fig9a.csv: Comparison of the Power Spectral Density (PSD) of data recorded by the direct optical fibre shape sensing system, an optical fibre Bragg grating strain sensor and a 1D accelerometer with finite element modeling predictions, measured on the top surface of an Airbus Helicopters H135 bearingless main rotor blade on the quarter chord line at approximately 40% rotor radius. Fig9b.csv: Comparison of the Power Spectral Density (PSD) of data recorded by the direct optical fibre shape sensing system, an optical fibre Bragg grating strain sensor and a 1D accelerometer with finite element modeling predictions, measured on the top surface of an Airbus Helicopters H135 bearingless main rotor blade on the quarter chord line at approximately 60% rotor radius. Fig10_FBG_top.csv: Power Spectral Density (PSD) of the 7th fibre Bragg grating strain (FBG) sensor (FBG7) in the three FBG arrays bonded to the top surface of the Airbus Helicopters H135 bearingless main rotor blade, located at approximately 60% rotor radius. Fig10_FBG_bottom.csv: Power Spectral Density (PSD) of the 7th fibre Bragg grating strain sensor (FBG7) in the three FBG arrays bonded to the bottom surface of the Airbus Helicopters H135 bearingless main rotor blade, located at approximately 60% rotor radius. Fig11.csv: Time series of raw data of 3F frequency input collected at approximately 60% rotor radius for the accelerometer, fibre Bragg grating strain sensor and direct optical fibre shape sensor (vertical direction). Fig12.csv: Comparison of Power Spectral Density (PSD) for the 3F mode measured at approximately 60% rotor radius by the accelerometer, fibre Bragg grating strain sensor and direct optical fibre shape sensor (vertical direction). Fig14.csv: Mode shapes measured using the direct optical fibre shape sensor Fig15.cvs: Comparison of normalised displacement mode shapes measured using a 1D accelerometer, the direct optical fibre shape sensor with the finite element model prediction Fig16.csv: Normalised angle measurements performed by the direct optical fibre shape sensor with the ouput from the FE model for Mode 5F Fig17.csv:Comparison of normalised strain mode shapes determined by the FBG strain sensors and the output from the FE model.Item Open Access Applied Optics: HSW gas cells for mid-IR spectroscopy (2016)(Cranfield University, 2016-08-22 13:32) Francis, Daniel; Hodgkinson, Jane; Tatam, RalphData associated with Applied Optics submission, 'Low volume, fast response-time hollow silica waveguide gas cells for mid-IR spectroscopy'Item Open Access Correction of periodic displacement non-linearities by two-wavelength interferometry - associated data(Cranfield University, 2021-08-23 10:26) Bridges, Angus; Yacoot, Andrew; Kissinger, Thomas; Humphreys, David; Tatam, RalphData associated with the publication "Correction of periodic displacement non-linearities by two-wavelength interferometry".Item Open Access Data for: The use of range-resolved interferometry for multi-parameter sensing in a wind tunnel(Cranfield University, 2023-12-12 14:59) Barrington, James; James, Stephen; Kissinger, Thomas; Staines, Stephen; Alcusa Saez, Erica; Lawson, Nicholas; Tatam, Ralph; Prince, SimonEach data set relates to the data displayed in Figure 2 of the conference paper. The 1st column in each file outlines the data type and unit.Item Open Access Data supporting "Optical Fibre Pressure Sensing Using a Frequency Modulated Laser-Based Signal Processing Technique"(Cranfield University, 2023-04-21 12:36) Barrington, James; James, Stephen; Kissinger, Thomas; Staines, Stephen; Prince, Simon; Alcusa Saez, Erica; Lawson, Nicholas; Tatam, RalphEach file contains the relevant data to the figure as stated in its name. Column headers within the file outline the variable and its associated unit. The authors, where possible, have tried to keep the data in its rawest, useable form in order to provide the greatest flexibility for future manipulation. All data files are formatted as csv for accessibility.Item Open Access Data supporting 'Fibre-Coupled, Multiplexed Methane Detection Using Range Resolved Interferometry'(Cranfield University, 2023-02-10 15:51) Bremner, James; Kissinger, Thomas; Hodgkinson, Jane; Tatam, RalphDataset for paper: Fig 2 & Fig3: Time of measurement, The OPD being interrogated, The amplitude of the signal produced by the RRI system, The applied window used, The raw interferrometric signal from the photdiode Note: The Time measurement only applies to the measurement of the interferometric signal. The RRI signal amplitude is instantaneous Fig 4: The extracted light intensity passing through each tube as a function of time over the period of one ramp. (arbitary units) Fig 5 Absorption Heights: The height of the normalised absorption curves in each test Fig 5 Recorded Gas Flows: The gas flow measurements in each test that were used to calculate the gas concentrations in each test Fig 6: Allan Deviation: The value for the Allan Deviation at each integration period Fig 7: Cross Talk Raw Data: The height of the normalised absorption curve measured for Tube 1 in each test. Fig 7: Cross Talk Protocol: The gas flow supplied to each tube during each test.Item Open Access Data supporting the publication 'Compact methane sensor using an integrating sphere and Interband Cascade Laser at 3313nm'(Cranfield University, 2023-04-28 16:45) Davis, Nicholas; Francis, Daniel; Hodgkinson, Jane; Tatam, RalphData associated with Sensors and Actuators B submission "Compact methane sensor using an integrating sphere and Interband Cascade Laser at 3313nm"Item Open Access Data supporting: 'Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: data for the measurement of shape'(Cranfield University, 2022-09-01 15:50) Kissinger, Thomas; James, Stephen; Weber, Simone; Mullaney, Kevin; Chehura, Edmon; Barrington, James; Staines, Stephen; Tatam, RalphFSI_Phase_Data_Shape_CORD.csv contains the raw phase data from the three Fibre Segment interferometry array installed on the Direct Optical Fibre Shape Sensing Rod described in the paper: "Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run - part 2: measurement of shape", Smart Materials and Structure, online 25 May 2022. Shape_Data_Vertical_CORD.csv contains the processed shape data in the vertical (flapping) direction, for the T&B2 ground run. Note that the position measurements are relative to the first FSI reflector on the rod, not to the centre of rotation of the blade. Shape_Data_Horizontal_CORD.csv contains the processed shape data n the horizontal (lagging) direction, for the T&B2 ground run. Note that the position measurements are relative to the first FSI reflector on the rod, not to the centre of rotation of the blade.Item Open Access Data supporting: 'Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run: data for the measurement of strain'(Cranfield University, 2022-09-01 15:49) James, Stephen; Kissinger, Thomas; Weber, Simone; Mullaney, Kevin; Chehura, Edmon; Barrington, James; Tatam, RalphFBG_Data_CORD.csv contains the raw wavelength data from the 10 FBGs (G1-G10) recorded during the ground run detailed within the paper "Fibre-optic measurement of strain and shape on a helicopter rotor blade during a ground run - part 1: measurement of strain", James et al. Smart Materials and Structures, available online, May 2022. The unit of the "Time" column is seconds, while the units of columns G1-G10 are nanometers. FSI_Data_CORD.csv contains the raw phase data obtained from the interferometers formed between the reflectors (R1-R10,) and the cleaved end of the optical fibre, recorded during the ground run detailed within the paper The unit of the "Time" column is seconds, while the units of columns R1-R10 are radians.Item Open Access Data: Automated interlayer wall height compensation for wire based directed energy deposition additive manufacturing(Cranfield University, 2024-05-08 16:28) Qin, Jian; Vives, Javier; Rajan, Parthiban; Lasisi, Shakirudeen; Wang, Chong; Charrett, Tom; Ding, Jialuo; Williams, Stewart; Hallam, Jonathan; Tatam, RalphExperimental dataset to support the publication. The data includes all the test and measurement records for the experiment.Item Open Access Data: Low-coherence and broadband confocal refractometry: Reducing the measurement time(Cranfield University, 2023-08-31 15:39) Francis, Daniel; Hallam, Jonathan; Tatam, RalphData from the paper 'Low-coherence and broadband confocal refractometry: Reducing the measurement time'Item Open Access Fabrication of Optical Fibre Tapers(Cranfield University, 2017-05-19 08:47) Mullaney, K; James, Stephen; Tatam, RalphData concerning the fabrication of tapered optical fibres. Presented in Proc. SPIE 10323, 10323D. channelled_spectrum_development.zip - Evolution of channeled spectrum during tapering of SMF 28 optical fiber, using a CO2 laser as the heat source. OFS_2017_TAPER_FIGURE2.xlsx - The spectral response of a Vosskuhler NIR-300P NIR camera and the Planckian black body radiation curves (dashed lines) for a range of temperatures near the melting point of silica optical fibres. OFS_2017_TAPER_FIGURE4.xlsx - The strain measured bya fibre Bragg gratings and laser power used during the fabrication of a taper.Item Open Access High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm(Cranfield University, 2021-01-21 17:44) James, Stephen; Aime, Laura; Kissinger, Thomas; Chehura, Edmon; Tatam, RalphData underlying the work presented in the paper "High sensitivity pressure measurement using optical fibre sensors mounted on a composite diaphragm", published in Optics Express, 2020. Each zip file contains the data and a text file describing the contents. Full details are provided in the paperItem Open Access I2MTC 2024 Glasgow - Towards High Resolution Absolute Angle Sensing using Dual-Wavelength Laser Speckle(Cranfield University, 2024-02-27 13:05) Gibson, Sam; Charrett, Tom; Tatam, RalphData supporting the conference paper 'Towards High Resolution Absolute Angle Sensing using Dual-Wavelength Laser Speckle', presented at the International Instrumentation and Measurement Technology Conference (I2MTC) in Glasgow, in May 2024.Item Open Access Identification and quality assessment of beverages using a long period grating fibre-optic sensor modified with a mesoporous thin film(Elsevier, 2014-07-23) Korposh, Sergiy; Selyanchyn, Roman; James, Stephen; Tatam, Ralph; Lee, Seung-WooIn this study, an optical fibre long period grating (LPG) sensor functionalised with a mesoporous thin film was employed for the identification and quality assessment of beverages. The principle of the discrimination of beverages using an LPG sensor is based on the measurement of the change in refractive index of a sensitive film, induced by the binding of the chemical compounds present in the beverage. The sensitive film deposited onto the LPG consisted of poly(allylamine hydrochloride) (PAH) and silica nanospheres (SiO2 NPs) with diameters ranging from 40 nm to 50 nm. PAH imparts selectivity, while the SiO2 NPs endow the film with high porosity and enhanced sensitivity. In this study, five different types of beverages, red and white wines, brandy, nihonshyu (sake, a Japanese rice wine), and shochu (a Japanese distilled beverage), prepared via distillation and fermentation, were used to assess the capability of the sensor to identify the origin of the beverages. In addition, a selection of red wines was used to evaluate the use of the sensor in the assessment of the quality of beverages. The results obtained were benchmarked against those obtained using gas chromatography–mass spectrometry for the determination of volatile compounds contributing to the flavours of a set of red wines. Principal component analysis (PCA) was employed for data analysis. This approach enabled both quality assessment of beverages and identification of the methods and materials used for their preparation.Item Open Access IEEE sensors 2016 poster(Cranfield University, 2016-10-21 15:18) Barrington, James; James, Stephen; Tatam, Ralph; Partridge, MatthewConference poster for IEEE sensors 2016 conference. Data can be found using the referenced URL.