IP Library › Granted Patent US 8,901,479
Granted Patent B2
US 8,901,479 · App. 13/338,142 · Granted Dec 2, 2014

Sensor assembly for fluid detection and discrimination

Inventor: Douglas M. Johnson (Seattle, WA)
G01N21/552G01N2021/434
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Quick Facts
Patent No.
US 8,901,479
App. No.
13/338,142
Granted
Dec 2, 2014
Kind
B2
Abstract

A light transmitting optical fiber shines light at a side edge portion of a hemispherical lens. The light is transmitted along the periphery of the lens to a second side edge portion located opposite the first side edge portion. A light sensitive component detects light at the second edge portion which light resulted from the light transmitted at the first side edge portion. The intensity of light detected at the second side edge portion is indicative of the fluid to which the lens is exposed, and can be evaluated and signaled by a microprocessor.

Claims (44)

1. A sensor assembly for fluid detection and discrimination in an area of interest, said assembly comprising:

a lens component having an outer periphery with a substantially semi-circular cross-section including a central apex, and first and second side edge portions disposed at opposite sides of the apex and extending approximately parallel to each other, the lens component having an inner surface located opposite the outer periphery;

a holder in which the lens component is mounted for exposure of the lens outer periphery to an area of interest;

a light-transmitting component mounted in the holder remote from the area of interest and transmitting light toward the inner surface of the lens and at the first side edge portion of the lens;

a light sensitive component mounted in the holder remote from the area of interest to detect light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion; and

means for detecting the intensity of light received at the light sensitive component and for providing an indication signal of a characteristic of a fluid in the area of interest as a function of the detected intensity.

2. The sensor assembly defined in claim 1 , in which the detecting means provides a signal indicating the presence or absence of two or more of water, air, alcohol, and gasoline.

3. The sensor assembly defined in claim 1 , in which the detecting means provides a signal indicating the presence or absence of two or more of water, air, alcohol, and a fuel.

4. The sensor assembly defined in claim 1 , in which the lens outer periphery has a coating that affects the intensity of light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion.

5. The sensor assembly defined in claim 1 , in which the light transmitted by the light-transmitting component includes light at the interior of the lens periphery and light at the exterior of the lens periphery.

6. The sensor assembly defined in claim 4 , in which the coating is a composition that affects the amount of attenuation in light intensity from the light transmitting component to the light sensitive component.

7. The sensor assembly defined in claim 4 , in which the coating is a composition that reacts with a fluid of interest.

8. The sensor assembly defined in claim 4 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid of interest.

9. The sensor assembly defined in claim 4 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid selected from the group of ammonia compounds and hydrazine.

10. The sensor assembly defined in claim 4 , in which the coating is a composition selected from the group of xanthene dyes and triphenylmethane dyes.

11. The sensor assembly defined in claim 4 , in which the coating contains an ingredient incorporated in a liquid plastic carrier.

12. A sensor assembly for fluid detection and discrimination in an area of interest, said assembly comprising:

a lens component having an outer periphery with a substantially semi-circular cross-section including a central apex, and first and second side edge portions disposed at opposite sides of the apex and extending approximately parallel to each other, the lens component having an inner surface located opposite the outer periphery;

a holder in which the lens component is mounted for exposure of the lens outer periphery to an area of interest;

a light-transmitting component mounted in the holder remote from the area of interest and transmitting light toward the inner surface of the lens and at the first side edge portion of the lens;

a light sensitive component mounted in the holder remote from the area of interest to detect light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion, the light sensitive component being a light intensity detector; and

a microprocessor evaluating the intensity detected by the light detector and providing a signal indicating the presence or absence of a fluid of interest based on the detected intensity.

13. The sensor assembly defined in claim 12 , in which the microprocessor provides a signal indicating the presence or absence of two or more of water, air, alcohol and gasoline.

14. The sensor assembly defined in claim 12 , in which the microprocessor provides a signal indicating the presence or absence of two or more of water, air, alcohol and a fuel.

15. The sensor assembly defined in claim 12 , in which the light transmitted by the light-transmitting component includes light at the interior of the lens periphery and light at the exterior of the lens periphery.

16. The sensor assembly defined in Claim 12 , in which the lens outer periphery has a coating that affects the intensity of light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion.

17. The sensor assembly defined in claim 16 , in which the coating is a composition that affects the amount of attenuation in light intensity from the light transmitting component to the light sensitive component.

18. The sensor assembly defined in claim 16 , in which the coating is a composition that reacts with a fluid of interest.

19. The sensor assembly defined in claim 16 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid of interest.

20. The sensor assembly defined in claim 16 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid selected from the group of ammonia compounds and hydrazine.

21. The sensor assembly defined in claim 16 , in which the coating is a composition selected from the group of xanthene dyes and triphenylmethane dyes.

22. The sensor assembly defined in claim 16 , in which the coating contains an ingredient incorporated in a liquid plastic carrier.

23. A sensor assembly for fluid detection and discrimination in an area of interest, said assembly comprising:

a lens component having an outer periphery with a substantially semi-circular cross-section including a central apex, and first and second side edge portions disposed at opposite sides of the apex and extending approximately parallel to each other, the lens component having an inner surface located opposite the outer periphery;

a holder in which the lens component is mounted for exposure of the lens outer periphery to an area of interest;

a light-transmitting component mounted in the holder remote from the area of interest and transmitting light toward the inner surface of the lens and at the first side edge portion of the lens;

a light sensitive component mounted in the holder remote from the area of interest to detect light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion, the lens outer periphery having a coating that affects the intensity of light emitted at the inner surface of the lens adjacent to the second side edge portion as a result of light from the light-transmitting component at the first side edge portion.

24. The sensor assembly defined in claim 23 , in which the coating is a composition that affects the amount of attenuation in light intensity from the light transmitting component to the light sensitive component.

25. The sensor assembly defined in claim 23 , in which the coating is a composition that reacts with a fluid of interest.

26. The sensor assembly defined in claim 23 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid of interest.

27. The sensor assembly defined in claim 23 , in which the coating is a composition that exhibits fluorescence in the presence of a fluid selected from the group of ammonia compounds and hydrazine.

28. The sensor assembly defined in claim 23 , in which the coating is a composition selected from the group of xanthene dyes and triphenylmethane dyes.

29. The sensor assembly defined in claim 23 , in which the coating contains an ingredient incorporated in a liquid plastic carrier.

30. The sensor assembly defined in claim 23 , in which the light transmitted by the light-transmitting component includes light at the interior of the lens periphery and light at the exterior of the lens periphery.

Continuity (3)
Continuation In Part 11852233 · Sep 7, 2007
Provisional Application 60843515 · Sep 9, 2006
Related Publication 20120161034A1 · Jun 28, 2012