These fiber optical probes are based on the combined use of fiber optic sensors and GRIN lenses (Graded Refractive INdex Lenses). The CREC-GS sensor generates a focal region with high light energy density 5mm away from the probe tip. These optiprobes have been successfully employed in downflow gas-solid reactors and dense phase fluidized beds, to characterize solid flow patterns.
These fiber optical probes consist of various components: a) a GRIN lens, b) an emitter optical fiber, and c) a receiver optical fiber. The laser beam is focused on the emitter fiber end and helps to create with the GRIN lens, a focal region in front of the CREC-GS-Optiprobe. Solid particles or bubbles crossing the focal region are detected with minimum flow disturbance.
The CREC - GS - Optiprobes can measure axial particle cluster velocities, axial cluster slip velocities, cluster sizes and solid fractions in gas - solid catalytic reactors.
The CREC -GS - Optiprobes, can measure bubble flow in gas - solid fluidized beds.
The CREC - GS - Optiprobes create a highly illumated focal region where hydrodynamic parameters can be measured with minimum gas - solid flow disturbance.
The CREC - GS - Optiprobes obtained data support CPFD (Computational Particle Fluid Dynamic) numerical calculations.