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Browsing University of Hertfordshire by Author "Ludlow, I.K."
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Application of Riccati-Bessel functions in light scattering
Ludlow, I.K. (University of Hertfordshire, 2008)Riccati-Bessel functions, written as combinations of amplitude and phase functions, have been used to re-express Mie theory. This leads to a simple physical explanation of the scattered phase angle as the sum of a phase ... -
Compact optical trapping microscope using a diode laser
Ulanowski, Z.; Ludlow, I.K. (2000)Single beam gradient force optical trapping (laser tweezers) is increasing in importance as a technique for microparticle and cell manipulation and for the measurement of piconewton forces in aqueous media. An optical trap ... -
High-speed scanning laser diffractometer
Kaye, Paul H.; Ludlow, I.K. (1979)A high-speed laser diffractometer is described which employs a novel scanned array or optical light guides to record the angular intensity variation of light scattered radially by a particle throughout an arc of 180 degrees ... -
An instrument for the classification of airborne particles on the basis of size, shape and count frequency
Kaye, Paul H.; Eyles, N.A.; Ludlow, I.K.; Clark, J.M. (1991) -
Respirable asbestos detection using light scattering and magnetic alignment
Ulanowski, Z.; Wang, Z.; Kaye, Paul H.; Ludlow, I.K. (1998)The detection of respirable asbestos fibres in the ambient environment has grown in importance as the health risks associated with this material have become more fully understood. However, there is no real-time method of ... -
Scalar field of non-paraxial Gaussian beams
Ulanowski, Z.; Ludlow, I.K. (2000)A family of closed form expressions for the scalar field of strongly focused Gaussian beams in oblate spheroidal coordinates is given. The solutions satisfy the wave equation and are free from singularities. The lowest ... -
Scanning diffractometer for the rapid analysis of microparticles and biological cells
Ludlow, I.K.; Kaye, Paul H. (1979-05-01)A laser diffractometer is described which employs a novel scanned array of optical light guides to record the angular intensity variation of light scattered radially by a particle throughout an arc of 180° in approximately ...