Optics: measuring and testing – By dispersed light spectroscopy – With raman type light scattering
Patent
1997-03-28
1999-10-26
Evans, F. L.
Optics: measuring and testing
By dispersed light spectroscopy
With raman type light scattering
356318, 356342, G01N 2149, G01N 2164, G01N 2165
Patent
active
059737794
ABSTRACT:
A fiber-optic imaging probe is disclosed for use in dynamic light scattering applications. The probe includes two monomode optical fibers and two GRIN lenses to form a pair of identical fiber-lens combinations. Each fiber is positioned off the optical axis of its associated lens. Further, the optical fibers are placed at an image plane of the lenses. The fiber-lens combinations are parallel to and mirror images of each other. The first fiber-lens combination projects a tightly focused spot of light into a scattering volume containing suspended or dispersed microscopic particles, or biological or live tissues. The second fiber-lens combination collects the light which is scattered from the particles in the scattering volume and conveys it to a photo detector and autocorrelator for analysis. The probe minimizes the scattering volume by advantageously using imaging principles of lenses. Further, the probe optimizes sensitivity and spatial coherence. The probe provides rapid determination of particle diffusivities and their respective size distributions in the scattering volume. The probe can be combined with a video and/or microscopic imaging system for visual monitoring of the scattering volume in real time. The probe may be used in a wide variety of optical diagnostic applications. Further, the probe is easy to manufacture and use.
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Ansari Rafat R.
Suh Kwang I.
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