• Admin
    UC Research Repository
    View Item 
       
    • UC Home
    • Library
    • UC Research Repository
    • College of Science
    • Science: Theses and Dissertations
    • View Item
       
    • UC Home
    • Library
    • UC Research Repository
    • College of Science
    • Science: Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of the RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    Statistics

    View Usage Statistics

    Evaluation of an interference filter photometer for the measurement of atmospheric ozone and aerosol scattering

    Thumbnail
    View/Open
    wood_thesis.pdf (6.371Mb)
    Author
    Wood, Stephen Wyatt
    Date
    1989
    Permanent Link
    http://hdl.handle.net/10092/8239
    Thesis Discipline
    Physics
    Degree Grantor
    University of Canterbury
    Degree Level
    Doctoral
    Degree Name
    Doctor of Philosophy

    A multi-wavelength, narrow-band, interference filter spectrophotometer has been designed by the New Zealand Meteorological Service. Its intended function is to provide measurements of atmospheric transmission at ultraviolet, visible, and infrared wavelengths, and from these measurements be able to characterise the aerosol scattering optical depth as a function of wavelength and determine the total amount of ozone in a vertical column of the atmosphere. The design was prompted by the similarity of conventional sun photometers to the photometers built at the University of Canterbury, New Zealand, solely for the measurement of total ozone. The instrument has been built to this design by the Physics Department, University of Canterbury, and has been tested and evaluated by the author. The photometer has eleven filters with bandpasses in the range from 310 nm to 940 nm. The bandwidths are 5 nm in the ultraviolet and 10 nm elsewhere. The three shortest wavelength filters lie in the Huggins absorption band of ozone and are to provide an estimate of the quantity of atmospheric ozone. The remaining filters are principally at wavelengths intended for the measurement of aerosol optical depth. The filter at 940 nm is for the determination of the quantity of water vapour in the atmosphere. Two detectors are used to cover the range of wavelengths. The photometer tracks the sun by means of a heliostat. A description of the photometer and the measurements made with it in New Zealand and the Antarctic are presented. These show that this is a design that comes close to meeting its objective. Despite the set back of one of the important ultraviolet filters changing in transmission characteristic, the instrument can still provide approximate values for ozone. The systematic errors in these values are discussed. The values it gives for aerosol optical depth show the varying wavelength dependence of aerosol scattering. The specific problems that limit both the accuracy of the measurements and the range over which they can be made are identified and possible solutions are suggested.

    Collections
    • Science: Theses and Dissertations [3603]
    Rights
    https://canterbury.libguides.com/rights/theses

    UC Research Repository
    University Library
    University of Canterbury
    Private Bag 4800
    Christchurch 8140

    Phone
    364 2987 ext 8718

    Email
    ucresearchrepository@canterbury.ac.nz

    Follow us
    FacebookTwitterYoutube

    © University of Canterbury Library
    Send Feedback | Contact Us