颜料中非破坏和在线分析检测方案(激光拉曼光谱)

智能文字提取功能测试中

The non destructive and in-situ analysis of pigments Investigations in co-operation with the Police Department Berlin， Dr. Geyer-Lippmann Introduction In our daily life pigments are important forcolouring of household utensils，e.g. varnishes，plastics， textiles， writings or art paints. Thenatural scientific identification of pigments hassome problems， because of their insolubility incommon solvents. Especially when one dealswithh6examinations of very smallsampleamounts or wishes to perform non-destructiveanalysis， e.g. inn forensic laboratoriesonanalysis of art paintings. Raman spectroscopyturns out to be a ideally suited technique tosolve these analytical problems. Questions ofproductidentification， dateanalysis ordetection of falsifications can now be solvedusing Raman spectroscopy. This analyticalmethod is a powerful instrument for all thesequestions. Cut through a painting showing different layersand separated pigments Special fields in pigment analysis A major important forensic question is thestudy of varnish fragments of cars after hit-and-run offences. This kind of analysis is done by comparison ofthe varnish that is found at the accident placeand defined varnishes of car manufactories. Another area is the association of plastics ortextiles to commercial products. Analysing the pigments is often helpful in addition to materialidentification. In the field of art analysis pigments often giveinformationaboutittheage， productionprocesses， restorations or falsifications of arts.Combinedwithhistoricalinformationthissupports the valuation of arts. Use of Raman Spectroscopy Modern dispersive Raman spectrometers coupled to a microscope give in combination with differentlaser excitations various possibilities for identification of organic and inorganic pigments. To get goodspectra from red， yellow and white pigments， 633 nm and 785 nm laser wavelengths are the bestchoice whereas for green and blue pigments， a green excitation (514，5 nm or 532 nm) is oftenrecommended (see picture below). To avoid fluorescence， it is basically necessary to have more thanonelaser. The use of a microscope allows to get information with a high spatial resolution. This is realised thanksto the true confocal entrance optics of the LabRAM and LabRAM Infinity， the latest being a fullyautomated Raman system. In the following section are examples of typical pigments showing great differences in the spectra. Textiles ： brown E-RN Levafix brilliant green GB Remazol Pigments ： Procion PrintingCu-Phtalocyanine (blue) c之 Raman Shift (cm-1) Roller pen paste： blue paste， Papermate blue paste， DDR-product Car varnishes： iNissan ultrared Lada skyblue HORIBAJOBIFNYVONrance ：in Yvon S.A.S.， 231 rue de Lille， 59650 Villeneuve d 'Ascq. Tel：+33(0)3 20 59 18 00， HORIBA Job Fax：+33 (0)3 20 59 18 08. Email ： raman@jobinyvon.fr www.jobinyvon.frUSA： HORIBA Jobin Yvon Inc.， 3880 Park Avenue， Edison， NJ 08820-3012. Tel：+1-732-494-8660，Fax：+1-732-549-2571. Email ： raman@jobinyvon.com www.jobinyvon.comJapan ： HORIBA Ltd.， JY Optical Sales Dept.， 1-7-8 Higashi-kanda， Chiyoda-ku， Tokyo 101-0031.Tel： +81 (0)3 3861 8231， Fax： +81 (0)3 3861 8259. Email： raman@horiba.comGermany： +49 (0)6251 8475-0 Italy： +39 0257603050UK： +44 (0)208204 8142China： +86 (0) 10 6849 2216 4/4(All HORIBA Jobin Yvon companies were formerly known as Jobin Yvon) ORIBAExplore the future Wavenumber (cm-)/HORIBAExplore the future The use of a microscope allows to get information with a high spatial resolution. This is realised thanks to the true confocal entrance optics of the LabRAM and LabRAM Infinity, the latest being a fully automated Raman system.