Study on the applicability of LIBS to sorting

Ryo Togawa, Taka Aki Hatano, Shuji Owada

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    Abstract

    LIBS (Laser Induce Breakdown Spectroscopy) could be considered one of the best sensing methods to apply to metal sorting process because this method can detect most of the elements with high accuracy. However, the method still has many problems to be solved for the application. In this paper, we investigated the effects of basic parameters, such as laser pulse energy, focal position, plasma detection delay time, etc. on the LIBS performance. From the above investigation it has been found that spectra intensity and P/B (Peak/Background) ratio was increased with increasing laser pulse energy and that the intensity and P/B ratio were rapidly decreased when laser focal position is off the sample surface by over approx. 2 mm. We also found out that the spectra intensity was gradually decreased with increasing plasma detection delay time but P/B ratio showed the maximum at around 8 μs and that the delay time to obtain the maximum P/B ratio was increased with increasing laser pulse energy.

    Original languageEnglish
    Title of host publicationEARTH 2015 - Proceedings of the 13th International Symposium on East Asian Resources Recycling Technology
    PublisherInternational Symposium on East Asian Resources Recycling Technology
    Pages730-736
    Number of pages7
    Publication statusPublished - 2015
    Event13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015 - Pattaya, Thailand
    Duration: 2015 Nov 12015 Nov 4

    Other

    Other13th International Symposium on East Asian Resources Recycling Technology, EARTH 2015
    CountryThailand
    CityPattaya
    Period15/11/115/11/4

    Keywords

    • Detection delay time
    • Focal position
    • Laser energy
    • LIBS
    • Sensor based sorting

    ASJC Scopus subject areas

    • Environmental Science(all)

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