K.I. Suh

Particle-size and velocity measurements in flowing conditions using dynamic light scattering

The noninvasive optical technique of dynamic light scattering (DLS) is routinely used to characterize dilute and transparent submicrometer particle dispersions in laboratory environments. A variety of industrial and biological applications would, however, greatly benefit from on-line monitoring of dispersions under flowing conditions. We present a model experiment to study flowing dispersions of polystyrene latex particles of varying sizes under varying flow conditions by using a newly developed fiber-optic DLS probe. A modified correlation function proposed in an earlier study is applied to the analysis of extracting the size and velocity of laminar flowing particulate dispersions. The complementary technique of laser Doppler velocimetry is also used to measure the speed of moving particles to confirm the DLS findings.

A Dual Wavelength Fiber-Guided Dynamic Light Scattering Instrument in a Compact Carry-On

The design, construction, assembly, and testing of a compact and portable fiber optic-based dynamic light scattering instrument are reported. The noninvasive instrument integrates latest solid state and fiber optic technologies to study the ocular fluids and tissues from the cornea to the retina in the eyes of live animals in field applications.

Instrumentation and calibration protocol for a continuous wave NIRS oximeter

We describe a continuous wave near infrared oximeter and its calibration protocol. The system performs quantitative assessments exploiting precise absorption measurements close to the absorption peak of the water: 975nm. We report the procedures and the systematic in vitro tests adopted to characterize and calibrate the entire system. A final stability analysis is reported to validate the instrumentation