Sensing device and methods related thereto

1. A device for measuring a state of charge of a fluid enclosure of an electronic device that is powered by at least one fuel cell, the device comprising:

a sensing device that responds to a change in distance between the fluid enclosure and a substrate, wherein the sensing device is disposed on the substrate and includes a photosensor;

wherein the fluid enclosure stores a fuel for the at least one fuel cell;

wherein the change in distance is a function of at least one dimension of the fluid enclosure, wherein the change in distance indicates a proximity of the fluid enclosure to the substrate, and is caused by a transport of the fuel from the fluid enclosure and an amount of fuel within the fluid enclosure indicates the state of charge of the fluid enclosure.

2. The device of claim 1 , wherein the distance encompasses a length of a cavity adjacent to the fluid enclosure.

3. The device of claim 2 , wherein the fluid enclosure is disposed in at least part of the cavity.

4. The device of claim 1 , wherein the sensing device detects an observable property of the fluid enclosure in proportion to the distance.

5. The device of claim 1 , wherein the photosensor detects an amount of light in proportion to a change in dimension of the fluid enclosure.

6. The device of claim 1 , wherein the photosensor comprises an emitter and a receptor.

7. The device of claim 6 , wherein the emitter and the receptor are positioned such that a light transmission from the emitter reflects from a target region of the fluid enclosure to the receptor.

8. The device of claim 1 , wherein the photosensor comprises an infrared light emission diode and an infrared phototransistor.

9. The device of claim 1 , wherein the fluid enclosure includes a solid component.

10. The device of claim 9 , wherein the solid component comprises a fluid storage material enclosed within an outer enclosure wall.

11. A fluidic system of an electronic device, comprising:

a fluid enclosure in fluid communication with one or more electrochemical cells, wherein the fluid enclosure stores a fuel for the one or more electrochemical cells and is located within a cavity defined by the electronic device, and the one or more electrochemical cells are located within the electronic device; and

a sensing device that responds to a change in at least one dimension of the fluid enclosure;

wherein the sensing device is at least partially enclosed within the electronic device and includes a photosensor that detects an amount of light in proportion to a distance between at least a portion of the fluid enclosure and the sensing device, wherein the change in distance indicates a proximity of the fluid enclosure to the sensing device.

12. The fluidic system of claim 11 , wherein the one or more electrochemical cells comprise fuel cells.

13. The fluidic system of claim 11 , wherein the one or more electrochemical cells comprise electrolytic cells.

14. The fluidic system of claim 11 , further comprising a modifying element at least partially enclosed within the electronic device.

15. The fluidic system of claim 14 , wherein the modifying element modifies a property detected by the sensing device.

16. The fluidic system of claim 11 , further comprising a light diffusing region, a surface-treated region, or a combination thereof in contact with a surface of the fluid enclosure.

17. The fluidic system of claim 14 , further comprising an adhesive layer adapted to couple the modifying element to the fluid enclosure.

18. The fluidic system of claim 11 , further comprising an infrared photosensor that determines a temperature of the fluid enclosure.

19. The fluidic system of claim 11 , further comprising an encryption component in contact with the fluid enclosure.

20. The fluidic system of claim 19 , wherein the encryption component includes information for system operability.

21. The fluidic system of claim 11 , wherein the sensing device is attached to a printed circuit board.

22. The fluidic system of claim 11 , further comprising at least one temperature sensor that communicates a temperature of one or more of the fluid enclosure and electronic device.

23. The fluidic system of claim 11 , further comprising a controller that determines a mass of fluid within the fluid enclosure in response to a signal.

24. The fluidic system of claim 23 , wherein the controller is adapted to adjust the mass of fluid in response to a signal.

25. The fluidic system of claim 23 , wherein the signal comprises a temperature reading.

26. The fluidic system of claim 11 , wherein the fluid enclosure comprises a flexible fluid enclosure.

27. The fluidic system of claim 11 , wherein the fluid enclosure comprises a fluid enclosure with a flexible portion.

28. The fluidic system of claim 11 , wherein the electronic device comprises a cellular phone, satellite phone, PDA, laptop computer, computer accessory, ultra mobile computer, display, personal audio or video player, medical device, television, transmitter, receiver, lighting device, flashlight or electronic toy.

29. The fluidic system of claim 11 , wherein the fluid enclosure includes a fluid.

30. The fluidic system of claim 29 , wherein the fluid comprises a gas.

31. The fluidic system of claim 29 , wherein the fluid comprises hydrogen.

32. The fluidic system of claim 11 , wherein the fluid enclosure includes a solid component.

33. The fluidic system of claim 32 , wherein the solid component comprises a fluid storage material and is capable of occluding and desorbing hydrogen.

34. The fluidic system of claim 32 , wherein the solid component comprises a composite hydrogen storage material.

35. The fluidic system of claim 32 , wherein the solid component comprises a metal hydride.

36. The fluidic system of claim 32 , wherein the solid component comprises clathrates, silicas, aluminas, zeolites, graphite, activated carbons, nano-structured carbons, micro-ceramics, nano-ceramics, boron nitride nanotubes, palladium-containing materials or combinations thereof.

37. The fluidic system of claim 32 , wherein the solid component comprises a flexible fluid enclosure.

38. The fluidic system of claim 32 , wherein the solid component comprises a portion of a flexible fluid enclosure.

39. The fluidic system of claim 11 , further comprising one or more valves between the one or more electrochemical cells and the fluid enclosure.

40. The fluidic system of claim 11 , further comprising an interface for replenishing the fluid enclosure.

41. A method for monitoring a state of a fluid enclosure in an electronic device, comprising:

providing an electronic device and a fluid enclosure, wherein the electronic device defines a cavity and the fluid enclosure is disposed at least partially within the cavity, and wherein the fluid enclosure is in fluid communication with at least one fuel cell located within the electronic device and the fluid enclosure contains a fuel for the at least one fuel cell;

determining an observable property of the fluid enclosure, wherein the observable property is a distance between the fluid enclosure and a wall of the cavity and wherein the determination is made by measuring an amount of light detected by a photosensor and wherein the observable property is a function of the mass of a fluid contained within the fluid enclosure, wherein the change in distance indicates a proximity of the fluid enclosure to the photosensor.

42. The method of claim 41 , further comprising determining the mass of the fluid contained within the fluid enclosure based on the observable property.

43. The method of claim 41 , further comprising determining a state of charge of the fluid enclosure based on the observable property.

44. The method of claim 43 , wherein determining comprises determining that the fluid enclosure is substantially full when the mass of the fluid contained within the fluid enclosure is above a predetermined threshold.

45. The method of claim 41 , further comprising determining a temperature of the fluid enclosure based on the observable property.

46. The method of claim 41 , further comprising authenticating the fluid enclosure in response to a permission-based observable property of the fluid enclosure.

47. The method of claim 41 , further comprising rejecting the fluid enclosure in response to a permission-based observable property of the fluid enclosure.

48. The method of claim 41 , further comprising preventing use of the fluid enclosure.

49. The method of claim 41 , further comprising providing a signal in response to a change in a state of charge.