EyeTech Laboratory


The EyeTech uses a unique time-size mapping technology called Laser Obscuration Time to directly measure particles size.
A He-Ne laser beam passes through a rotating wedge prism and is focused down to a small spot. The result is a circular movement of a focused laser beam. The laser beam scans the individual particles in the measurement zone. As the particles within the sample volume are individually bisected by the laser spot, interaction signals are generated. These signals are then detected by a photodiode.
 

 
Since the beam rotates at a constant speed, the duration of interaction (obscuration) provides a direct measurement of the individual particlesize. The interaction signals are collected by a dedicated data acquisition card and analyzed in 600 discrete size intervals.
Sophisticated pulse analysis algorithms are employed to reject out-of-focus and off-center interactions.
The strength of the Laser Obscuration Time principle is that it relates solely and directly to particle size, rather than to secondary properties from which size may be inferred. This eliminates inconsistencies due to sample refractive index, viscosity variations, Brownian Motion and thermal convection.
Routine calibration is not required, and to a large degree, results are not dependent on the optical properties of the particulates or the medium. Problems of coincidence and orifice clogging are avoided by using interaction pulse analysis to provide an optically defined measurement zone, rather than a mechanically defined orifice.
Simultaneously offering high resolution and wide dynamic range, the Laser Obscuration Time analysis generates the most accurate one-dimensional sizing of particles.

Categorie

EyeTech MicroScopy

EyeTech MicroScopy 

EyeTech Laser Probe

EyeTech Laser Probe

EyeTech Laser Probe 

Ankersmid Lab          info@ankersmid-lab.nl,  (31)-0548-59 59 79