Transducer for measuring environmental parameters

• US 7,787,128 B2
• Filed: 01/24/2008
• Issued: 08/31/2010
• Est. Priority Date: 01/24/2007
• Status: Active Grant

• Current Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Original Assignee: Halliburton Energy Services Incorporated (Halliburton Company)
• Inventors: Lopushansky, Richard
• Primary Examiner(s): Lyons; Michael A
• Application Number:
  US12/011,057
• Publication Number:
  US 20080186506A1
• Time in Patent Office: 950 Days
• Field of Search: 356/35.5, 356/454, 356/480, 356/519, 359/578, 385/12
• US Class Current: 356/480
• CPC Class Codes: G01D 5/268 using optical fibres G01D5/28 - G01D5/38 take precedence
• CPC Class Codes: G01D 5/35312 using a Fabry Perot

Abstract

Apparatus, methods, and other embodiments associated with measuring environmental parameters are described herein. In one embodiment, a transducer comprises a tube, an elongated member, a first reflective surface, a second reflective surface, and an optical fiber. The tube has a first end and a second end, and the elongated member also has a first end and a second end, with the first end of the elongated member secured to the tube. The second reflective surface is secured to the second end of said elongated member, and the first reflective surface is spaced apart from the second reflective surface and secured to the second end of the tube. The optical fiber is positioned to direct light towards the first and second reflective surfaces and to collect the reflected light from these two surfaces.

Claims

1. A transducer for measuring environmental parameters, the transducer comprising:

a tube having a first end and a second end;

an elongated member having a first end and a second end, wherein said first end of said elongated member is secured to said tube;

a first reflective surface and a second reflective surface, where said second reflective surface is positioned proximate to said second end of said elongated member and said first reflective surface is spaced apart from said second reflective surface; and

an optical fiber positioned to direct light towards said first and second reflective surfaces.

2. The transducer of claim 1, further comprising a cap secured to said first end of said tube.

3. The transducer of claim 1, wherein said first end of said elongated member is secured to said first end of said tube.

4. The transducer of claim 1, wherein said first and second reflective surfaces form a Fabry-Perot interferometer sensor.

5. The transducer of claim 4, further comprising a computerized system coupled to said optical fiber to measure light signals reflected into said optical fiber from said first and second reflective surfaces.

6. The transducer of claim 5, wherein said transducer determines a value for pressure applied to said transducer.

7. The transducer of claim 5, wherein said tube is comprised of a material with a first coefficient of thermal expansion, and said elongated member is comprised of a second coefficient of thermal expansion that is different from said first coefficient of thermal expansion.

8. The transducer of claim 7, wherein said transducer determines a value for temperature of said transducer.

9. The transducer of claim 1, further comprising a hydrogen-absorbing member.

10. The transducer of claim 1, further comprising a ball and socket assembly to secure and position said optical fiber.

11. The transducer of claim 1, further comprising an annular glass ring secured to said second end of said tube.

12. The transducer of claim 11, further comprising a tapered member secured to said annular ring, said annual ring comprised of glass or metal.

13. The transducer of claim 12, wherein the tapered member includes a second reflective surface.

14. The transducer of claim 1, further comprising a ball lens attached to said optical fiber.

15. The transducer of claim 1, further comprising a temperature sensor.

16. The transducer of claim 1, further comprising an external pressure isolation step.

17. A method for determining an environmental parameter comprising:

providing a transducer comprising a tube, an elongated member, a first reflective surface and a second reflective surface, where said second reflective surface is coupled to said elongated member and said first reflective surface is spaced apart from said second reflective surface, and an optical fiber positioned to direct light towards said first and second reflective surfaces;

gathering light reflected by said first and second reflective surfaces;

analyzing light reflected by said first and second reflective surfaces; and

determining distance between said first and second reflective surfaces.

18. The method of claim 17, further comprising:

calculating a pressure associated with said distance between said first and second reflective surfaces; and

determining pressure applied to said transducer from determined distance between said first and second reflective surfaces.

19. The method of claim 18, further comprising:

providing a temperature sensor with said transducer;

measuring temperature of transducer; and

adjusting determined pressure from measured temperature of transducer.

20. The method of claim 17, further comprising:

calculating a temperature associated with said distance between said first and second reflective surfaces; and

determine temperature of said transducer from determined distance between said first and second reflective surfaces.