On-line Sorting Technologies for CCA Treated Wood Sarasota Team Meeting June 5, 2001

Objective To design and implement an automated system to effectively sort CCA-treated wood from other wood types at C&D facilities

Project Tasks Task 1: Construct Shelter Task 2: Construct Conveyor Task 3: Lab Test and Develop Detector Task 4: Install and Field Test Conveyor & Detector Task 5: Operate Sorting System and Document Performance

SHELTER

Control Room

CONVEYOR

DETECTOR

Experimentation Pallet Study 100 pallets tested and 0 were CCA-treated Wood Sort 2 construction piles and 2 demolition piles were sorted

Wood Sort

Questions?

Laser-Induced Breakdown Spectroscopy (LIBS)

LIBS spectrum of CCA-treated wood

LIBS detector: Tasks and status Acquire laser and spectrometer components Interface spectrometer to the computer for data acquisition with external triggering Optical configuration design and design of detector package Construct prototype detector system Synchronize spectrometer data acquisition with firing of laser

LIBS detector: Tasks and status (con’t) Interface output trigger signal with PC for firing strobe light upon CCA detection Design and build detector mount Field test instrument ( ) Laser repair (estimate completion today) Construct timing delay circuit Final installation and testing

Optical configuration: Lens design Sample analysis regime Laser beam Beam expander

Optical configuration: Lens design Analysis Region

Spectrometer-computer interface Plasma emission Fiber optic Laptop computer Spectrometer Ext. trigger from laser Data acquisition and analysis Strobe trigger

Instrument synchronization Time0Pre-trigger Laser pulse (10 ns) Plasma emission (25 us) Chromium emission (10 us) Detector Delay

Strobe Fire strobe lights when CCA is detected Requires firing rate of 2 Hz and TTL trigger logic NOVA Electronics is building a custom strobe unit with four output channels

Initial field test on Threshold