Ocean Optics LIBS2500plus - Manual (Page 16)

1: Introduction
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LIBS Sample Chamber
The LIBS-SC Sample Chamber is a key component of the Ocean Optics LIBS system and is designed to
perform various functions safely and in clear view. The chamber houses a manually controlled x-y stage.
The chamber is made of an eye-protective polymer that provides a clear view of a sample. The laser focus
lens and spectrometer probe mounting hardware is easily adjustable to accommodate samples varying in
height. The sample chamber also includes an exhaust system to evacuate any particulates created by the
ablation process and an inert gas induction port for ablation area purge. The chamber door is magnetically
latched and interacts with the safety-interlock that prevents the laser from firing when the door is open. A
12 Volt DC power supply is included for chamber lighting and exhaust fan power.
LIBS Imaging Module
The LIBS-IM-USB Imaging Module directly attaches to the LIBS-SC Sample Chamber, which enables
users to magnify a sample image and to establish a laser ablation target on the sample. The camera is also
useful for adjusting the laser focus above or below the sample surface. The LIBS-IM-USB is in the same
focal plane as the sample surface; when the image is in focus, the laser is focused to the surface of the
sample, enabling precise, rapid, and convenient laser focus. The USB-enabled color camera captures pre-
and post-ablation images of the sample and provides up to 1280 x 1024 pixel resolution.
OOILIBSplus Software
The Windows-based OOILIBSplus Analysis Software operates the LIBS2500plus spectrometer system,
fires the laser and identifies the element being analyzed. There are five main features in the software:
 Element Identification: The Element Identification feature compares the sample spectrum
against a spectral library to find possible matches. The software will provide a rating of any
matches found based on the number of identical lines. Currently, OOILIBSplus comes with a
library of "persistent lines of spark spectra." We are investigating other spectral library packages.
 Reference Correlation -- by Full Pixel: The Reference Correlation feature allows for real-time
matching of a complete spectrum with spectra in a user-generated library. You can compare the
full spectrum produced by your sample to those in the library and the software instantly provides
the match with the closest composition, the correlation coefficient and a list of all other close
matches. The reference full-pixel library is limited to a specific LIBS2500plus spectrometer
channel.
 Reference Correlation -- by Spectral Line: This version of the Reference Correlation feature is
wavelength-based, not pixel-based. You can set various parameters to identify the presence of a
specific line or lines for wavelength matching. The spectral library can be shared among many
spectrometers, even those with different ranges.
 Line Tracking Over Multiple Samples: This feature allows you to track the height from one to
thousands of chosen lines over many spectra and perform statistical analysis for identifying and
tracking various elements in samples.
 Time Dependent Analysis: This feature performs analysis of the time decay of the plasma. The
spectrometer takes a set of data while delaying the point in which the spectrometer looks at the
plasma after the laser fires. You can then plot progressive decay or differential decay.