LIF (Laser Induced Fluorescence)

LIF (Laser Induced Fluorescence)

Laser-Induced Fluorescence (LIF) Probe System

LIF is an innovative in-situ characterization technology for rapid, cost-effective 3D delineation of DNAPL (Dense Non-Aqueous Phase Liquid) contamination in the subsurface.

Technical Principle:

The latest LIF system integrates time-resolved LIF with front-window dye injection, enabling non-fluorescent DNAPL to fluoresce in situ.

Workflow:

The probe injects a water-based transport fluid containing proprietary hydrophobic dye through a small injection port below the LIF window. As the probe advances underground, the dye contacts soil and binds to DNAPL. Standard LIF tools detect the dye-tagged DNAPL via fluorescence intensity and lifetime signatures:

• High fluorescence + long lifetime: DNAPL presence.

• Low fluorescence + short lifetime: No DNAPL.

Technical Advantages:

• Rapid Source Zone Delineation: Enables targeted remediation planning.

• In-Situ Fluorescence Activation: Converts non-fluorescent NAPL into detectable DNAPL.

• High Contrast Visualization: Black background with light blue/white elements ensures clarity.