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Cleaning Art Objects By Laser
 

Cleaning Art Objects By Laser

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By Sandra Santos

By Sandra Santos

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    Cleaning Art Objects By Laser Cleaning Art Objects By Laser Presentation Transcript

    • CLEANING ART OBJECTS BY LASER Sandra Santos English Class OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • TOPICS Laser cleaningWhy laser? Some artwork aplications How do lasers work? OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • STANDARD SYSTEMS OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • STANDARD SYSTEMSSource: “ARTWORK CONSERVATION BY LASER” http://alpha1.infim.ro/cost/ OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • STANDARD SYSTEMS d) a) Fig. 1: Lynton Laser c) Nd:YAG - L1 a) articulated arm;b) b) worktable; c) exhausting e) system; d) laser control panel; e) command and safety labels. OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • HOW DO LASERS WORK? Reflecting surface Basic Process: selective vaporization of black crusts(Source : “Laser Cleaning in Conservation”, Martin Cooper) OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS Description: Around the drum-shaped pedestal surmounting the granite basement, four shacked prisoners in posestheanguish resignation are seated Monument to of Memory of the late on Lord Nelson – de 1813, Liverpool blocks positioned at the cardinal points: they represent Nelson’s fourstone and bronze,Cape St. Sculpture group in great victories at located in Exchange Flags Square, Vincent, the Nile, Copenhagen, and Trafalgar. Between the designed set Matthew drum are four Liverpool, prisoners by into the Cotes Wyatt and scalped by Sir Richard bronze bas-reliefs depicting various naval actions in which Nelson engaged. Encircling granite bellow Westmacott, composed by a the drum basement and a marble Westmorland. the cornice are swags of laurel, four longer ones above sculptural work in made shorter above the The the relieves and four in bronze. prisoners. The swags are slung 4,3 m. Height of bronze group: from behind lion’s heads located at the2,1 m corners of the pilasters Figures top each. framing the prisoners. Surmounting all is the Apotheosis group. OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS PrisonersCorrosion. Rust. Soiling. Concretions. OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS Prisoners Before the leg cleaning During the cleaning work OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS Prisoners Fluence SPOT Energy Distance Diameter Area Aplied (mm) (mm) (cm2) E/P (mJ) (J/cm2) 120 5,2 0,21 358-371 1,7 OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS Letters belonging to the inscription OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • ANALYSIS OF RESULTS TO THE MICROSCOPE Over cleaned surface Damaged surface Laser cleaning Before irradiation E/P = 125mJ Corroded surface Fi = 10 Hz salts accumulation F= 0,6 J/cm2 OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • EXPERIMENTAL CLEANING OF METALLIC MATERIALS Microphotograph of brass surface before the irradiation. Image with Magnification 16 x. Width of original image 21 cm. Laser cleaning Before irradiation E/P = 81 mJ Corroded surface Fi = 10 Hz salts accumulation F= 0,2 J/cm2 OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • ANALYSIS OF RESULTS TO THE MICROSCOPE Corrosion removal whithout causing damage on the surface - acceptable cleaning level E/P = 154 mJ, Fi = 10 Hz E/P = 125mJ, Fi = 10 Hz F= 0,4 J/cm2 F = 0,3J/cm2, wet surface OPTOELECTRÓNICA CML-DMC-DPC-DPC
    • FINAL RESULTSOPTOELECTRÓNICA CML-DMC-DPC-DPC
    • FINAL RESULTSOPTOELECTRÓNICA CML-DMC-DPC-DPC
    • OPTOELECTRÓNICA CML-DMC-DPC-DPC