Advanced prism-grating-prism imaging spectrograph in online industrial applications

Tapio Vaarala, Mauri Aikio, Heimo Keränen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    27 Citations (Scopus)


    Imaging spectrographs have traditionally been utilized in aerial and remote sensing applications. A novel, compact and inexpensive imaging spectrograph developed by VTT Electronics is now available. It contains a multichannel fiber optic sensor head, a dispersive prism-grating-prism (PGP) component and digital CCD matrix camera capable of area integration. In rolled steel manufacturing, a protective oil film is applied on steel to resist corrosion while in transport and storage. The main problems in the oiling machine are film thickness control and jet failures. In this application, the spectrum of fluorescence of an oil film was measured simultaneously with parallel fibers. A relatively simple calibration and analysis procedure was used to calculate the oil film thickness. On-line color control for color reproduction is essential in both consumer and industrial products. The instrument was tested and analyzed for measuring differences in color by multivariate analysis of the spectra and by color space coordinate estimation. In general, a continuous spectrum is not absolute requirement. In these two examples, filter-based measurement would probably cost less thana PGP spectrograph solution. On the other hand, by measuring the spectrum and using an advanced signal processing algorithm one production version will cover all installations in both applications. In practice, only the fiber sensor mechanics need to be modified.
    Original languageEnglish
    Title of host publicationNew Image Processing Techniques and Applications
    Subtitle of host publicationAlgorithms, Methods, and Components II
    EditorsPhilippe Refregier, Rolf-Jürgen Ahlers
    Place of PublicationBellingham
    PublisherInternational Society for Optics and Photonics SPIE
    ISBN (Print)978-0-8194-2521-8
    Publication statusPublished - 1997
    MoE publication typeA4 Article in a conference publication
    EventNew Image Processing Techniques and Applications: Algorithms, Methods, and Components II - Munich, Ger
    Duration: 18 Jun 199719 Jun 1997

    Publication series

    SeriesProceedings of SPIE


    ConferenceNew Image Processing Techniques and Applications: Algorithms, Methods, and Components II
    CityMunich, Ger


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