Browsing Research publications by Author "Martin, Bill"

Now showing items 1-20 of 22

    • BASIS: Bayfordbury single-object integral field spectrograph 

      Richards, S.; Martin, Bill; Campbell, D.; Jones, H.R.A.; Bland-Hawthorn, J.; Lawrence, J.; Brinks, E.; Bryant, J.J.; Fogarty, L.; Gallaway, M.; Goodwin, M.; Leon-Saval, S.; Sarzi, M.; Smith, Daniel (SPIE, 2012-09)
      We present an inexpensive (<US$500) and easily replicable integral field unit for use on small aperture telescopes. Based on a commercial small spectrograph (SBIG Self-Guiding Spectrograph) and a 37 optical fibre bundle ...

    • The Effect of Retro-reflectivity and Reflectance of UK Number Plates on ANPR Performance 

      Gurney, Robert; Rhead, Mike; Martin, Bill; Ramalingam, Soodamani; Cohen, Neil (2013-12-16)
      The UK police service is one of the biggest users of ANPR technology in the world and over a number of years Police Forces have reported variances in ANPR performance based upon the retro-reflectivity properties of UK ...

    • Electronic Number Plate Generation for Performance Evaluation 

      Ramalingam, Soodamani; Martin, Bill; Rhead,, Michael; Gurney, Robert (Institute of Electrical and Electronics Engineers (IEEE), 2022-09-26)
      The authors have been involved in real world analysis of Automatic Number Plate Recognition (ANPR) data and systems particularly for law enforcement applications. As a result of such work with Law Enforcement Agencies, ...

    • EXOhSPEC collimator mechanical design 

      Kawinkija, Adipthep; Buisset, Christophe; Jones, Hugh; Martin, Bill; Errmann, Ronny (SPIE, 2019-09-09)
      The Exoplanet High-Resolution Spectrograph (EXOhSPEC) is a high-resolution spectrograph for the characterisation of exoplanets with the Thai National Telescope. The folded version of this instrument comprises one triplet ...

    • EXOhSPEC folded design optimization and performance estimation 

      Lhospice, Esther; Buisset, Christophe; Jones, Hugh; Martin, Bill; Errmann, Ronny (SPIE, 2019-09-09)
      The EXOplanet high resolution SPECtrograph (EXOhSPEC) instrument is an echelle spectrograph dedicated to the detection of exoplanets by using the radial velocity method using 2m class telescopes. This spectrograph is ...

    • HiFLEx – a highly flexible package to reduce cross-dispersed Echelle spectra 

      Errmann, Ronny; Cook, Neil; Jones, Hugh; Anglada Escude, Guillem; Sithajan, Sirinrat; Semenko, Eugene; Mkrtichian, David; Martin, Bill; Tanvir, Tabassum; Feng, F.; Collett, James (2020-06)
      We describe a flexible data reduction package for high resolution cross-dispersed echelle data. This open-source package is developed in Python and includes optional GUIs for most of the steps. It does not require any ...

    • High Average Power Phase-Coded Laser System for the CTF3 Photoinjector. 

      Kurdi, G.; Musgrave, I. O.; Divall, M.; Springate, E.; Hirst, G.; Ross, I.; Martin, Bill (IEEE COMPUTER SOC, 2007)
      In this paper we present the results of a diode-pumped high average power high repetition rate laser system delivering 50 Hz macropulses of 1.5GHz 1047nm pulses with a mean power of 9 kW per macropulse. (C) Optical Society ...

    • High-sensitivity Stokes spectropolarimetry on cyanobacteria 

      Martin, Bill; Hesse, E.; Hough, J.H.; Gledhill, T.M. (2016-02-01)
      We investigate the spectral signatures arising from the optical properties of chlorophyll in linear and circularly polarised scattered light from cyanobacteria. We include Stokes scattering coefficient measurements on two ...

    • Highly replicable, low-cost, portable, general-purpose, high-resolution spectrometer with applications in stellar studies and exoplanet science 

      Baker, Clark; Anglada-Escude, Guillem; Jones, Hugh; Martin, Bill (SPIE, 2019-09-09)
      High-resolution spectrometers have proven to be an important tool for astronomical observations and continue to have an ever expanding set of applications, such as high resolution IFS (Integral Field Spectroscopy). With ...

    • A history of high-power laser research and development in the United Kingdom 

      Danson, Colin N.; White, Malcolm; Barr, John R. M.; Bett, Thomas; Blyth, Peter; Bowley, David; Brenner, Ceri; Collins, Robert J.; Croxford, Neal; Dangor, A. E. Bucker; Devereux, Laurence; Dyer, Peter E.; Dymoke-Bradshaw, Anthony; Edwards, Christopher B.; Ewart, Paul; Ferguson, Allister I.; Girkin, John M.; Hall, Denis R.; Hanna, David C.; Harris, Wayne; Hillier, David I.; Hooker, Christopher J.; Hooker, Simon M.; Hopps, Nicholas; Hull, Janet; Hunt, David; Jaroszynski, Dino A.; Kempenaars, Mark; Kessler, Helmut; Knight, Sir Peter L.; Knight, Steve; Knowles, Adrian; Lewis, Ciaran L. S.; Lipton, Ken S.; Littlechild, Abby; Littlechild, John; Maggs, Peter; Malcolm OBE, Graeme P. A.; Mangles, Stuart P. D.; Martin, Bill (2021-04-27)
      The first demonstration of laser action in ruby was made in 1960 by T. H. Maiman of Hughes Research Laboratories, USA. Many laboratories worldwide began the search for lasers using different materials, operating at different ...

    • Implications of the Method of Construction of UK Number Plates for Infrared Reflectance and Camera Settings on ANPR System 

      Rhead,, Michael; Ramalingam, Soodamani; Gurney, Rob; Martin, Bill; Jones, Andrew (Institute of Electrical and Electronics Engineers (IEEE), 2019-10-01)
      This paper considers the implications of two aspects of number plates firstly the varied manufacturing process in the physical construction of vehicle number plates that might affect the reflectance characteristics and ...

    • Incoherent light in tapered graded-index fibre: a study of transmission and modal noise   

      Choochalerm, Piyamas; Martin, Bill; Jones, Hugh; Usher, Sarah; Wright, Thomas; Yerolatsitis, Stephanos (2023-01-30)
      We investigated the impact of taper length on light transmission through tapered graded-index fibres. We tested commercial fibres from Thorlabs and a custom graded-index fibre using both coherent and incoherent light ...

    • Large aperture harmonic conversion experiments at Lawrence Livermore National Laboratory 

      Linford, G.J.; Johnson, B.C.; Hildum, J.S.; Synder, K.; Boyd, R.; Smith, W.L.; Hunt, J.T.; Speck, D.R.; Swain, J.E.; Martin, Bill (1981-12)

    • Large aperture harmonic conversion experiments at LLNL - comments 

      Linford, G.J.; Johnson, B.C.; Hildum, J.S.; Martin, Bill; Snyder, K.; Boyd, R.D.; Smith, W.L.; Vercimak, C.L.; Eimerl, D.; Hunt, J.T.; Seka, W.; Craxton, R.S.; Jacobs, S.D.; Lund, L.D.; McCrory, R.L.; Soures, J.M. (1983-07)

    • Leaf Scattering Polarimetry and Chlorophyll Fluorescence 

      Martin, Bill (2020-02-01)
      A number of spectropolarimetry measurements on leaves using white light and narrow band illumination have been reported in recent years because of interest in signatures for remote sensing of exoplanet life. Chlorophyll ...

    • A Method to Achieve High Dynamic Range in a CMOS Image Sensor Using Interleaved Row Readout 

      Wocial, Thomas; Stefanov, Konstantin; Martin, Bill; Barnes, John; Jones, Hugh (2022-11-15)
      We present a readout scheme for CMOS image sensors that can be used to achieve arbitrarily high dynamic range (HDR) in principle. The linear full well capacity (LFWC) in high signal regions was extended 50 times from 20 ...

    • Monitoring dust particle orientation with measurements of sunlight dichroic extinction 

      Daskalopoulou, V.; Raptis, I.P; Tsekeri, Alexandra; Amiridis, Vassilis; Kazadzis, S.; Ulanowski, Zbigniew; Metallinos , S.; Tassis, K.; Martin, Bill (2021-09-29)
      Alignment of irregularly shaped dust aerosols leading to linear dichroism has been reported in atmospheric layers. The present study intents to quantify the excess linear polarization of direct solar radiation propagating ...

    • Nonlinear effects on pulsed laser propagation in the atmosphere 

      Martin, Bill; Winfield, R.J. (1988-02)
      Nonlinear effects on the propagation of a high power pulsed laser beam through the earth’s atmosphere are modeled. Stimulated Raman scattering in relatively modest power laser beams is estimated to be very significant when ...

    • Optical-system for Argus 355-nm 90-mm aperture target illumination experiments 

      Johnson, B.C.; Hildum, J.S.; Linford, G.; Hermes, G.; Boyd, R.; Martin, Bill (1981-12)

    • A small actively-controlled high-resolution spectrograph based on off-the-shelf components 

      Jones, Hugh; Martin, Bill; Anglada, Guillem; Errmann, Ronny; London, Queen Mary University; Choochalerm, Piyamas; Boonsri, Chantira (2021-02-01)
      We present the design and testing of a prototype in-plane echelle spectrograph based on an actively controlled fiber-fed double-pass design. This system aims to be small and efficient with the minimum number of optical ...