1. Articles from Helen D. Ford

    1-6 of 6
    1. Metre-per-second microfluidic flow velocimetry with dual beam optical coherence tomography

      Metre-per-second microfluidic flow velocimetry with dual beam optical coherence tomography

      A novel dual beam Optical Coherence Tomography (OCT) instrument has been developed for high velocity flow measurement, principally in microfluidics applications. The scanned dual beam approach creates a pair of image-frames separated by a small spatiotemporal offset. Metre-per-second flow measurement is achieved by rapid re-imaging by the second beam allowing for particle tracking between each image-frame of the pair. Flow at 1.06 m/s using a single optical access port has been measured, more than two orders of magnitude larger than previously reported OCT systems, at centimetre depth and with millimetre scale depth of field within a microfluidic chip ...

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    2. Application of optical coherence tomography to non-destructively characterise rind breakdown disorder of ‘Nules Clementine’ mandarins

      Application of optical coherence tomography to non-destructively characterise rind breakdown disorder of ‘Nules Clementine’ mandarins

      The feasibility of optical coherence tomography (OCT) for imaging histological changes associated with the development of a progressive rind breakdown (RBD) disorder of ‘Nules Clementine’ mandarin ( Citrus reticulate Blanco.) was investigated. The investigation utilised fruit with different levels of the disorder, carefully selected from a batch of fruit stored for eight weeks at 8 ± 0.5 °C. Images of healthy and RBD-affected intact mandarin fruit were acquired using a Thorlabs OCT system based on a broadband 930 nm source. OCT provided high resolution 2D images of fruit rind to a depth of about 1.1 mm. Immediate and non-destructive acquisition ...

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    3. Feature Of The Week 2/10/13: Cranfield University Researchers Investigate Using OCT For Adhesive Cure Monitoring

      Feature Of The Week 2/10/13: Cranfield University Researchers Investigate Using OCT For Adhesive Cure Monitoring

      Monitoring the progress of cure in an adhesive enables changes in behaviour to be studied under differing conditions of temperature, humidity or illumination, and allows the importance of other factors, such as variability between production batches, volume of adhesive or altered composition due to aging, to be assessed. Detailed knowledge of the cure process minimises the time that must be allowed before further processing. For exothermic reactions, it is possible to track progress via measurement of the temperature at one or more positions within the cure region. More generally, acoustic sensors, which detect the material modulus, and dielectric measurement methods ...

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    4. Numerical modelling of imaging fibre bundles and their application in optical coherence tomography

      Numerical modelling of imaging fibre bundles and their application in optical coherence tomography

      Imaging fibre bundles are widely used in image transmission systems in the visible spectral range1. Their image transmission capabilities and flexibility make them interesting for OCT endoscopy2. However, cross-talk occurring between individual fibres and multimode transmission cause deterioration of the images obtained with OCT systems. In this study, a model of light propagation in a fibre bundle is developed using the Finite Difference - Time Domain (FDTD) method in order to quantify these effects. The simulated bundle output power density distribution is compared to experimental images.

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    5. Characterization of optical fiber imaging bundles for swept-source optical coherence tomography

      Characterization of optical fiber imaging bundles for swept-source optical coherence tomography

      Fiber imaging bundles have been investigated for use in endoscopic optical coherence tomography (OCT) systems, to obviate the requirement for scanning components within the endoscope probe section. Images have been acquired using several optical configurations, two of which are common path in design. Configurations have been selected as having potential for miniaturization and inclusion in endoscopic-type systems, since the advantages of employing imaging bundles are most clearly seen in this type of system. The various types of bundle available are described, and the properties of the leached bundles used here are discussed in detail, with reference to their effect upon ...

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    6. Coherent fibre bundles in full-field swept-source OCT

      Endoscopic OCT probes deliver light to the measurement region via a single optical fibre mounted in a probe head. The output beam is focused onto the sample, providing a single point measurement. The beam is translated, using mechanical scanning at the probe tip, to address a line or area of sampling points and produce an image. We are investigating a swept-source OCT system incorporating coherent fibre bundles, to allow many measurement points to be addressed, within an area of the sample, without the need for mechanical motion within the endoscope probe. Scanning components are still present at the input of ...

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    1-6 of 6
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    1. (6 articles) Cranfield University
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    Characterization of optical fiber imaging bundles for swept-source optical coherence tomography Numerical modelling of imaging fibre bundles and their application in optical coherence tomography Feature Of The Week 2/10/13: Cranfield University Researchers Investigate Using OCT For Adhesive Cure Monitoring Application of optical coherence tomography to non-destructively characterise rind breakdown disorder of ‘Nules Clementine’ mandarins Metre-per-second microfluidic flow velocimetry with dual beam optical coherence tomography A PhD position is available in OPIRA laboratory at the Biomedical Engineering Department of the University of Illinois in Chicago A PhD position is available in OPIRA laboratory at the Biomedical Engineering Department of the University of Illinois in Chicago Artifact Rates for 2D Retinal Nerve Fiber Layer Thickness Versus 3D Neuroretinal Rim Thickness Using Spectral-Domain Optical Coherence Tomography Development of Deep Learning Models to Predict Best-Corrected Visual Acuity from Optical Coherence Tomography Machine learning helps improve diagnostic ability of subclinical keratoconus using Scheimpflug and OCT imaging modalities Applications and Future Directions for Optical Coherence Tomography in Dermatology Anterior Segment Inflammation in Pediatric Uveitis Is Associated with Reduced Retinal Vascular Density as Quantified by Optical Coherence Tomography Angiography