Methods and apparatus for maintaining effective operation of apparatus for candling avian eggs

• US 20070024843A1
• Filed: 07/17/2006
• Published: 02/01/2007
• Est. Priority Date: 07/27/2005
• Status: Active Grant

• Current Assignee: Zoetis Services LLC (Zoetis Incorporated)
• Original Assignee: Embrex Incorporated (Zoetis Incorporated)
• Inventors: Bryan, Thomas, Hebrank, John
• Granted Patent: US 7,573,566 B2
• Time in Patent Office: Days
• US Class Current: 356/53
• CPC Class Codes: G01N 33/08 Eggs, e.g. by candling

Abstract

Egg candling methods and apparatus are provided wherein the optical path between a light source and light detector is monitored for obscuring debris and/or malfunctions. A method of candling eggs includes illuminating an egg with light from a light source; receiving light passing through the egg at a light detector; generating an output signal that corresponds to light received at the light detector for the egg; and analyzing the output signal to determine whether the optical path between the light source and light detector has been altered. In response to determining that a respective optical path has been altered, the light source and/or light detector is cleaned and/or inspected for malfunctions. Cleaning the light source and/or light detector may include wiping a surface of the light source and/or light detector and/or spraying a surface of the light source and/or light detector with a fluid.

Claims

1. A method of candling eggs, comprising:

a) illuminating an egg with light from a light source;

b) receiving light passing through the egg at a light detector;

c) generating an output signal that corresponds to light received at the light detector for the egg; and

d) analyzing the output signal to determine whether the optical path between the light source and light detector has been altered.

2. The method of claim 1, further comprising cleaning the light source and/or light detector in response to determining that a respective optical path has been altered.

3. The method of claim 1, further comprising inspecting the light source and/or light detector in response to determining that a respective optical path has been altered.

4. The method of claim 2, wherein cleaning the light source and/or light detector comprises removing optical path altering materials from the light source and/or light detector.

5. The method of claim 2, wherein cleaning the light source and/or light detector comprises wiping a surface of the light source and/or light detector.

6. The method of claim 2, wherein cleaning the light source and/or light detector comprises spraying a surface of the light source and/or light detector with a cleaning fluid.

7. The method of claim 1, wherein analyzing the output signal comprises detecting a light level that is below an expected light level.

8. A method of candling eggs with a candling apparatus, wherein the candling apparatus comprises a plurality of pairs of light sources and light detectors in spaced apart relationship such that a carrier of eggs may pass therebetween, wherein each light source/light detector pair is operatively associated with a processor, wherein each light source/light detector pair defines a respective optical channel, the method comprising:

a) illuminating eggs in a carrier with light from the light sources, wherein the eggs are arranged in rows and columns within the carrier, and wherein each egg in a row is positioned between a respective light source/light detector pair;

b) receiving light passing through each egg at a corresponding light detector;

c) generating an output signal that corresponds to light received at a light detector for each respective egg; and

d) analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered.

9. The method of claim 8, wherein analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered comprises detecting whether an average opacity value of clear eggs candled via an optical channel has dropped below an average opacity value of clear eggs candled via the other optical channels.

10. The method of claim 8, wherein analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered comprises detecting a drop in frequency of occurrence of clear eggs.

11. The method of claim 8, wherein analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered comprises detecting an increase in average light level of live eggs in an optical channel relative to historical values for that channel.

12. The method of claim 8, wherein analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered comprises detecting an increase in average light level of live eggs in an optical channel relative to historical values for other optical channels.

13. The method of claim 8, wherein analyzing the output signals of each optical channel to determine whether the optical path between any of the light source/light detector pairs has been altered comprises detecting a reduction in light levels received at a light detector in an optical channel relative to historical light levels for the optical channel.

14. The method of claim 8, further comprising cleaning the light source and/or light detector in response to determining that a respective optical path has been altered.

15. The method of claim 8, further comprising inspecting the light source and/or light detector in response to determining that a respective optical path has been altered.

16. The method of claim 14, wherein cleaning the light source and/or light detector comprises removing optical path altering materials from the light source and/or light detector.

17. The method of claim 14, wherein cleaning the light source and/or light detector comprises wiping a surface of the light source and/or light detector.

18. The method of claim 14, wherein cleaning the light source and/or light detector comprises spraying a surface of the light source and/or light detector with a cleaning fluid.

19. An apparatus for candling eggs, comprising:

a light source configured to illuminate an egg with light from one or more selected portions of the spectrum;

a light detector that receives light passing through an egg and that generates an output signal that corresponds to light received at the light detector for the egg; and

a processor in communication with the photodetector that analyzes the output signal to determine whether an optical path between the light source and light detector has been altered.

20. The apparatus of claim 19, further comprising a wiper operatively controlled by the processor and that is configured to wipe a surface of the light source and/or light detector.

21. The apparatus of claim 19, further comprising a cleaning fluid application system operatively controlled by the processor and that is configured to spray a surface of the light source and/or light detector with a cleaning fluid.

22. The apparatus of claim 19, further comprising a sheet of transparent material positioned adjacent to the light source that prevents debris from altering the optical path between the light source and light detector.

23. The apparatus of claim 19, further comprising a sheet of transparent material positioned adjacent to the light detector that prevents debris from altering the optical path between the light source and light detector.

24. The apparatus of claim 22, wherein the transparent material moves relative to the light source and is configured to carry away debris in contact therewith.

25. The apparatus of claim 23, wherein the transparent material moves relative to the light detector and is configured to carry away debris in contact therewith.

26. The apparatus of claim 21, wherein the processor is configured to detect whether an average opacity value of clear eggs candled via an optical channel has dropped below an average opacity value of clear eggs candled via the other optical channels.

27. The apparatus of claim 21, wherein the processor is configured to detect a drop in frequency of occurrence of clear eggs.

28. The apparatus of claim 21, wherein the processor is configured to detect an increase in average light level of live eggs.

29. The apparatus of claim 21, wherein the processor is configured to detect a reduction in light levels relative to historical light levels.

30. An apparatus for candling eggs, comprising:

a plurality of pairs of light sources and light detectors in spaced apart relationship such that eggs may pass therebetween, wherein each light source is configured to illuminate an egg with light from one or more selected portions of the spectrum, wherein each light detector is configured to receive light passing through an egg and to generate an output signal that corresponds to light received at the light detector for the egg, and wherein each light source/light detector pair defines a respective optical channel; and

a processor in communication with each optical channel that analyzes the output signals of each optical channel to determine whether an optical path between a light source and respective light detector has been altered.

31. The apparatus of claim 30, wherein the processor is configured to detect whether an average opacity value of clear eggs candled via an optical channel has dropped below an average opacity value of clear eggs candled via the other optical channels.

32. The apparatus of claim 30, wherein the processor is configured to detect a drop in frequency of occurrence of clear eggs.

33. The apparatus of claim 30, wherein the processor is configured to detect an increase in average light level of live eggs in an optical channel relative to historical values for that channel.

34. The apparatus of claim 30, wherein the processor is configured to detect an increase in average light level of live eggs in an optical channel relative to historical values for other optical channels.

35. The apparatus of claim 30, wherein the processor is configured to detect a reduction in light levels received at a light detector in an optical channel relative to historical light levels for the optical channel.

36. The apparatus of claim 30, further comprising a wiper operatively controlled by the processor and that is configured to wipe a surface of the light source and/or light detector.

37. The apparatus of claim 30, further comprising a cleaning fluid application system operatively controlled by the processor and that is configured to spray a surface of the light source and/or light detector with a cleaning fluid.

38. The apparatus of claim 30, further comprising a sheet of transparent material positioned adjacent to the light source that prevents debris from altering the optical path between the light source and light detector.

39. The apparatus of claim 30, further comprising a sheet of transparent material positioned adjacent to the light detector that prevents debris from altering the optical path between the light source and light detector.

40. The apparatus of claim 38, wherein the transparent material moves relative to the light source and is configured to carry away debris in contact therewith.

41. The apparatus of claim 39, wherein the transparent material moves relative to the light detector and is configured to carry away debris in contact therewith.