Detection of organic chemical material using laser induced fluorescence.

Laser-induced fluorescence of organic matter

Sludge applications have been used to maintain fertility of agricultural soils without damaging the natural ecosystem. The aim of this study was evaluating the influence of sewage-sludge addition on the quality of organic matter (OM) of a Brazilian Oxisol by Laser Induced Fluorescence (LIF). LIF was used to analyze OM of whole soil and different soil fractions separated by chemical and physical...

Laser-induced Fluorescence Microscopy of Coal Macerals and Dispersed Organic Material

Fluorescence microscopy has been a use fu l a n a l y t i c a l t o o l f o r cha rac t e r i z ing o r g a n i c m a t e r i a l i n v a r i o u s c o a l s and r o c k s (1-9). T e i c h m u l l e r and Wolf (3 ,7 ) discovered new f l u o r e s c i n g c o a l macerals , which a l s o were found by Spackman (6 ) i n U.S. coa l s . Ottenjahn e t a l . (9) r e l a t e d t h e f luo rescence p r...

Investigations of Laser - Induced Fluorescence in Organic Tissue

Dual Emission Laser-Induced Fluorescence (DELIF) in Chemical Mechanical Planarization

In this paper, we present a review of the measurements that Dual Emission Laser Induced Fluorescence (DELIF) has allowed us to make over the last 8 years. We have been able to measure many features of the slurry film between the wafer and the pad during polishing while simultaneously measuring the frictional drag. In particular, we measured slurry mean residence time, slurry temperature, and th...

Mixing Measurements Using Laser Induced Fluorescence

In this article, we present a novel method of quantitatively measuring mixing using laser induced fluorescence. This method is independent of flow and light sheet characteristics. The premise of this work is that molecular level mixing can be quantified through a scalar pH field in an aqueous solution. A two dimensional pH field can be determined in the solution by imaging the laser induced flu...