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US 2017/0284936 A1Published application
Light projection assembly for opacity monitors
AssigneeTeledyne Instruments, Inc.
InventorsEdward A. Smiercik, JR., Edward L. McCall
Life of this patent
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Abstract
The light projection assemblies and opacity monitors described in this specification have an integrating sphere with an input aperture, an output aperture, and a spherical-shaped internal chamber. An LED source is located external to the chamber at the input aperture. A light baffle is located within the chamber at the output aperture. A condenser lens is located external to the chamber at the output aperture.
Claims20
A light projection assembly comprising:
- an integrating sphere comprising an input aperture, an output aperture, and a spherical-shaped internal chamber;
- an LED source located external to the chamber at the input aperture;
- a light baffle located within the chamber at the output aperture;
- and
- a condenser lens located external to the chamber at the output aperture.
2 more elements
An opacity monitor comprising:
- a retroreflector assembly;
- and
- a transceiver assembly configured to project a light beam to the retroreflector assembly, wherein the retroreflector assembly is configured to reflect the projected light beam back to the transceiver assembly when the transceiver assembly and the retroreflector assembly are optically aligned along a central axis, the transceiver assembly comprising:
- a sensor configured to detect the intensity of the projected and reflected light beam;
- and
- a light projection assembly configured to produce the light beam, the light projection assembly comprising:
- an integrating sphere comprising an input aperture, an output aperture, and a spherical-shaped internal chamber;
- an LED source located external to the chamber at the input aperture;
- a light baffle located within the chamber at the output aperture;
- and
- a condenser lens located external to the chamber at the output aperture;
- wherein opacity values measured by the opacity monitor vary by no greater than ±0.5% opacity when the transceiver assembly or the retroreflector assembly is angularly misaligned by up to ±0.25 degrees from the central axis at a distance of 3 meters between the transceiver assembly and the retroreflector assembly.
9 more elements
Dependencies are inferred from the claim text.