Combined transmittance and angle selective scattering...

Details Combined transmittance and angle selective scattering... Combined transmittance and angle selective scattering...

2011-08-16

2011-08-16

Pham, Hoa Q (Department: 2886)

Optics: measuring and testing

For size of particles

By particle light scattering

C356S338000, C356S343000

Reexamination Certificate

active

07999936

ABSTRACT:
The refractive index, extinction coefficient, size and density of fluid suspended particles are simultaneously determined by combined transmittance and scattering measurements. The scattering measurements are preferably angle selective to obtain additional information about the scattered light. A charge-coupled device is employed for its high sensitivity to low light intensity in measurement of scattered light in combination with a photodiode array employed for its high signal to noise ratio, which is beneficial in transmittance measurement. The scattered light may be measured in an angle selective fashion by use of a motorized aperture that is concentrically positioned with respect to the impinging beam axis and moveable along the impinging beam axis. An ellipsoidal mirror collects the scattered light that passes through the motorized aperture and focuses the scattered light towards the charge-coupled device.

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Ferri et al, “Method version of the Chahine algorithm to invert spectral extinction data for particle sizing” Applied Optics, 34, p. 5829, 1995.

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