Hayes, Stewart J.; Pearcey, Richard; White, Philip T.; Andreae, Peter R.; Lowenstine, Mark R.;

Optical radiation sensor device

An optical radiation sensor comprising a housing having an inlet which allows radiation to enter the housing, and further comprising the following elements serially disposed after the inlet in the path of the radiation: attenuating aperture means, filter means and sensor means. A fluid disinfection system incorporating the sensor is also described.

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What is claimed is:

1. An optical radiation sensor comprising:

a housing having an inlet which allows radiation to enter the housing;

attenuating aperture means disposed in said housing, for attenuating radiation passing through said inlet;

filter means capable of removing visible radiation from radiation passing through said aperture means;

sensor means capable of detecting and responding to ultraviolet radiation passing through said filter means; and

stray radiation reducing means comprising an uneven surface disposed along an interior surface of said housing and off a radiation path, for reducing the amount of stray radiation reaching said sensor means.

2. The sensor defined in claim 1, wherein said filter means and said sensor means are integral.

3. The sensor defined in claim 1, wherein said inlet comprises a quartz window.

4. The sensor defined in claim 1, wherein each of said inlet, said attenuating aperture means and said filter means are separated by spacers.

5. The sensor defined in claim 3, wherein said inlet further comprises a mounting port partially covering said quartz window.

6. The sensor defined in claim 1, wherein said filter means comprises an optical filter.

7. The sensor defined in claim 1, wherein said body is constructed of stainless steel.

8. The sensor according to claim 1, wherein said filter means comprises a colored glass filter.

9. The sensor according to claim 1, wherein said sensor means comprises a photodiode.

10. The sensor according to claim 1, wherein said housing is substantially free of moisture.

11. The sensor according to claim 1, wherein said stray radiation reducing means comprises a roughening of the interior of said housing.