STP1015

    U.V. Laser Beam Diagnostics using a Computer Controlled Video Frame Store System

    Published: Jan 1988


      Format Pages Price  
    PDF Version (264K) 9 $25   ADD TO CART
    Complete Source PDF (14M) 9 $77   ADD TO CART


    Abstract

    In the past the spatial intensity profile of a laser beam has been measured using such techniques as scanning pinholes, detector arrays and photography.

    This new system converts the Excimer beam into visible light using a glass fluorescer with a very small penetration depth giving a good 2D image of the beam. The fluorescence has been found to be linear over a wide range of input energy and is imaged by a CCD camera linked to the computer controlled video frame store.

    The digitised information is then computer processed to yield such results as the intensity profile along an arbitary line, peak fluence, the difference between two images and various statistical values.

    This new technique has been applied to beams with widely varying diameters including analysis in the focal region and in the early detection of damage in materials.

    Keywords:

    Video frame store, computer controlled, 2D image, linearity, calibrated


    Author Information:

    Clark, SE
    University of Technology, Loughborough, Leics.

    Laidler, I
    University of Technology, Loughborough, Leics.

    Emmony, DC
    University of Technology, Loughborough, Leics.

    Omar, BA
    University of Technology, Loughborough, Leics.

    Shaw, MJ
    University of Technology, Loughborough, Leics.


    Paper ID: STP18721S

    Committee/Subcommittee: E13.03

    DOI: 10.1520/STP18721S


    CrossRef ASTM International is a member of CrossRef.