Fabry-Perot based temperature sensing

Patent metadata

Field	Value
Publication number	US-10386245-B2
Application number	US-201615532000-A
Country	US
Kind code	B2
Filing date	Apr 14, 2016
Priority date	Apr 14, 2016
Publication date	Aug 20, 2019
Grant date	Aug 20, 2019

Abstract

Fabry-Perot based optical computing devices and temperature sensors are disclosed for a number of applications including, for example, in-situ downhole fluid analysis and temperature detection.

First claim

What is claimed is:

1. A Fabry-Perot based temperature sensor, comprising:
a Fabry-Perot cavity, comprising:
a first reflective plate having one or more micro-electromechanical system (“MEMS”) building blocks; and
a second reflective plate having a temperature sensitive layer positioned thereon,
wherein the temperature sensitive layer is positioned to optically interact with electromagnetic radiation to produce a first reflected light,
wherein the second reflective plate is positioned to optically interact with the electromagnetic radiation to produce a second reflected light; and

a detector positioned to measure the first and second reflected lights and generated a first and second signal utilized to determine temperature.

2. A Fabry-Perot based temperature sensor as defined in claim 1 , wherein the first and second reflective plates are positioned in a step-like fashion relative to one another, such that portions of the first reflective plate are separated from the second reflective plate by different distances.

3. A Fabry-Perot based temperature sensor as defined in claim 1 , further comprising a bandpass filter positioned to optically interact with the first and second reflected lights to thereby generate spectrally filtered first and second reflected lights.

4. A Fabry-Perot based temperature sensor as defined in claim 1 , further comprising a signal processor communicably coupled to the detector to determine the temperature.

5. A Fabry-Perot based temperature sensor as defined in claim 4 , wherein the temperature is determined based upon a phase difference between the first and second signals.

6. A Fabry-Perot based temperature sensor as defined in claim 1 , further comprising a voltage source connected to the MEMS building blocks to thereby alter the distance between the first and second reflective plates.

7. A Fabry-Perot based temperature sensor as defined in claim 1 , further comprising:
an Integrated Computational Element (“ICE”) array positioned to optically interact with the electromagnetic radiation to produce optically-interacted light which mimics a regression vector of the sample characteristic of interest;
a bandpass filter positioned to optically interact with the optically-interacted light to produce filtered optically-interacted light; and
a detector positioned to measure the optically-interacted light and produce a third signal utilized to determine the sample characteristic of interest.

8. A Fabry-Perot based temperature sensor as defined in claim 1 , wherein the temperature sensor comprises part of a downhole reservoir interrogation system.

9. A Fabry-Perot based temperature sensing method, comprising:
optically interacting electromagnetic radiation with a sample to produce sample-interacted light;
optically interacting the sample-interacted light with a Fabry-Perot cavity to produce optically-interacted light, the Fabry-Perot cavity having a first reflective plate and a second reflective plate having a temperature sensitive layer positioned thereon, wherein micro-electromechanical system (“MEMS”) building blocks are used to alter a distance between the first and second reflective plate of the Fabry-Perot cavity to thereby produce second optically-interacted light that mimics a regression vector of a sample characteristic of interest, the second optically-interacted light being utilized to determine the sample characteristic of interest;
detecting the optically-interacted light and thereby generating a signal; and
utilizing the signal to determine temperature.

10. A Fabry-Perot based temperature sensing method as defined in claim 9 , wherein
optically interacting the sample-interacted light with the Fabry-Perot cavity comprises:
optically interacting the sample-interacted light with the temperature sensitive layer to produce a first reflected light; and
optically interacting the sample-interacted light with the second reflective plate to produce a second reflected light,
wherein the first and second reflected lights are utilized to determine the temperature.

11. A Fabry-Perot based temperature sensing method as defined in claim 10 , wherein optically interacting the sample-interacted light with the Fabry-Perot cavity comprises optically-interacting the sample-interacted light with a stepped profile of the first reflective plate to produce second optically-interacted light that mimics a regression vector of a sample characteristic of interest, the second optically-interacted light being utilized to determine the sample characteristic of interest.

12. A Fabry-Perot based temperature sensing method as defined in claim 9 , further comprising:
optically interacting the sample-interacted light with an Integrated Computational Element (“ICE”) array to produce second optically-interacted light that mimics a regression vector of a sample characteristic of interest;
detecting the second optically-interacted light and generating a second signal which corresponds to the sample characteristic of interest; and
determining the sample characteristic of interest using the second signal.

13. A Fabry-Perot based temperature sensing method as defined in claim 12 , wherein optically interacting the sample-interacted light with the ICE array comprises optically interacting the second optically-interacted light with a bandpass filter array to produce filtered second optically-interacted light, the filtered second optically-interacted light being detected.

14. A Fabry-Perot based temperature sensing method as defined in claim 10 , wherein the temperature is determined based upon a phase difference between the first and second reflective lights.

15. A Fabry-Perot based temperature sensing method as defined in claim 9 , wherein the temperature is determined using a signal processor.

16. A Fabry-Perot based temperature sensing method as defined in claim 9 , wherein the temperature sensing method is performed using a temperature sensor deployed as part of a downhole reservoir interrogation system.

17. A Fabry-Perot based temperature sensor, comprising:
a Fabry-Perot cavity, comprising:
a first reflective plate; and
a second reflective plate having a temperature sensitive layer positioned thereon,
wherein the temperature sensitive layer is positioned to optically interact with electromagnetic radiation to produce a first reflected light,
wherein the second reflective plate is positioned to optically interact with the electromagnetic radiation to produce a second reflected light;

a detector positioned to measure the first and second reflected lights and generated a first and second signal utilized to determine temperature;
an Integrated Computational Element (“ICE”) array positioned to optically interact with the electromagnetic radiation to produce optically-interacted light which mimics a regression vector of the sample characteristic of interest;
a bandpass filter positioned to optically interact with the optically-interacted light to produce filtered optically-interacted light; and
a detector positioned to measure the optically-interacted light and produce a third signal utilized to determine the sample characteristic of interest.

18. A Fabry-Perot based temperature sensor as defined in claim 17 , wherein the temperature sensor comprises part of a downhole reservoir interrogation system.

19. A Fabry-Perot based temperature sensor, comprising:
a Fabry-Perot cavity, comprising:
a first reflective plate; and
a second reflective plate having a temperature sensitive layer positioned thereon,
wherein th

Assignees

• Halliburton Energy Services Inc

Inventors

• Nayak Aditya B
• Price James M
• Perkins David L

Classifications

• E21B47/07

  Temperature · CPC title

• G01K5/48

  the material being a solid · CPC title

• G01K11/00 Primary

  Measuring temperature based upon physical or chemical changes not covered by groups G01K3/00, G01K5/00, G01K7/00 or G01K9/00 · CPC title

• G01K13/00

  Thermometers specially adapted for specific purposes · CPC title

• E21B47/065

  Fixed Constructions · mapped topic