CRACK REAGENT
    6.
    发明专利

    公开(公告)号:JPH07243991A

    公开(公告)日:1995-09-19

    申请号:JP1734495

    申请日:1995-02-03

    Applicant: BASF AG

    Abstract: PURPOSE: To detect cracks in a metal with excellent sensitivity by using a compound to be selected from among a group of phthalocyanine or the like containing metals or containing no metals having the wavelength of maximum absorption and maximum fluorescence in the specific range as a crack reagent. CONSTITUTION: A compound to be selected among the group of phthalocyanine, naphthalocyanine, aluminum compound of aromatic amine, methine dye, or azulene-squaric acid dye containing metals or containing no metals having the maximum absorption and the maximum fluorescence in the wavelength range of 620-1200nm is used as a crack reagent. The reagent solution is applied to a test specimen such as an aluminum block which is degreased and polished, the block is irradiated with semiconductor laser beams having maximum emission wavelength in the spectrum range λmax -100 to λmax +20nm of the maximum absorption wavelength of the marker substance, and the excited fluorescence is detected by a semiconductor detector, Because the fluorescence can easily be detected even in the sunshine, no expensive lamp is necessary, and a darkened visual test box can be dispensed with.

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