Interferometric optical chemical sensor

Details Interferometric optical chemical sensor Interferometric optical chemical sensor

1995-12-14

1999-06-29

Ullah, Akm E.

Optical waveguides

Optical waveguide sensor

25022723, 356432, G02B 600

Patent

active

059179660

ABSTRACT:
An optical sensor (100) that measures gas concentration (121) includes a light input port (103), and a light output port (111). A reference waveguide (105) and a measurement waveguide (113) are both coupled between the light input port (103) and the light output port (111). The measurement waveguide (113) preferably includes a hydrocarbon-catalytic material (114). When light (101) is injected into the light input port (103), the light traverses to the light output port (111) via both waveguides (105,113). Preferably, the hydrocarbon-catalytic material (114) in the measurement waveguide (113) will react with certain hydrocarbons present in an engine's exhaust gas stream (121) and heat will be generated in the measurement waveguide (113). This heat generation will change a refractive index and optical path length of the measurement waveguide (113) compared to the reference waveguide (105). A detector (117) detects light present at the light output port (111) which will have an intensity dependent on a difference between the refractive index and optical path length of the measurement waveguide (113) and the reference waveguide (105).

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