Diffractive optical fluid shear stress sensor

Details Diffractive optical fluid shear stress sensor Diffractive optical fluid shear stress sensor

2001-12-18

2004-04-06

Porta, David (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C356S028000, C356S441000, C073S861000

Reexamination Certificate

active

06717172

ABSTRACT:

BACKGROUND
A shear stress sensor may determine the shear stress of a fluid, e.g., in the area of an obstacle. Various shear stress sensors are known. These may be large and difficult-to-align devices.
SUMMARY
The present application teaches an integrated shear stress sensor which detects light scattering off particles flowing through a two-slit interference pattern. An embodiment uses diffractive optics in order to determine the shear stress.


REFERENCES:
patent: 3216318 (1965-11-01), Gaffard
patent: 3548655 (1970-12-01), Rudd
patent: 5327218 (1994-07-01), Igaki
patent: 5680211 (1997-10-01), Kaneda et al.
patent: 5701172 (1997-12-01), Azzazy
patent: 5835217 (1998-11-01), Medecki
patent: 6249351 (2001-06-01), de Groot

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