Systems for detecting a chemical species and use thereof

Patent metadata

Field	Value
Publication number	US-9448134-B2
Application number	US-201514727524-A
Country	US
Kind code	B2
Filing date	Jun 1, 2015
Priority date	Jun 23, 2014
Publication date	Sep 20, 2016
Grant date	Sep 20, 2016

Abstract

Systems and methods for detecting chemical species including a lens, a beam splitter, first and second bandpass filters, and first and second electromagnetic radiation detectors. The first bandpass filter has a first transmittance window having a first width transmitting greater than 50% of the filtered first electromagnetic radiation beam within a first electromagnetic radiation wavelength range. The second bandpass filter includes a second transmittance window having a second width within a second electromagnetic radiation wavelength range. The second transmittance window has an upper limit wavelength value that is greater than an upper limit wavelength value of the first transmittance window. The second bandpass filter is configured to transmit a lesser percentage of the second electromagnetic radiation beam passing through the second transmittance window than the first bandpass filter transmits of the first electromagnetic radiation beam passing through the first transmittance window.

First claim

What is claimed is:

1. A system for detecting at least one chemical species, comprising:
a lens;
a first beam splitter configured to receive a beam of electromagnetic radiation from the lens and separate the beam into a first electromagnetic radiation beam and a second electromagnetic radiation beam;
a first bandpass filter configured to receive the first electromagnetic radiation beam and transmit a filtered first electromagnetic radiation beam, the first bandpass filter is configured to transmit at least 50% of the first electromagnetic radiation beam passing through a first transmittance window, the first transmittance window having a first width including a first electromagnetic radiation wavelength range corresponding to at least a portion of a wavelength range of absorption or emission by the at least one chemical species to be detected;
a first electromagnetic radiation detector configured to receive at least a portion of the filtered first electromagnetic radiation beam from the first bandpass filter;
a second bandpass filter configured to receive the second electromagnetic radiation beam and transmit a filtered second electromagnetic radiation beam, the second bandpass filter including a second transmittance window having a second width within a second electromagnetic radiation wavelength range, the second transmittance window having an upper limit wavelength value that is greater than an upper limit wavelength value of the first transmittance window, the second bandpass filter configured to transmit a lesser percentage of the second electromagnetic radiation beam passing through the second transmittance window than the first bandpass filter transmits of the first electromagnetic radiation beam passing through the first transmittance window; and
a second electromagnetic radiation detector configured to receive at least a portion of the filtered second electromagnetic radiation beam from the second bandpass filter.

2. The system of claim 1 further comprising an analysis system including code within a processor, a non-transitory, computer-readable medium, or a combination thereof, the code configured to direct the processor to:
identify at least one image from the first electromagnetic radiation detector and at least one image from the second electromagnetic radiation detector;
compare the at least one image from the first electromagnetic radiation detector with the at least one image from the second electromagnetic radiation detector; and
determine if a difference between the images represents the detection of a chemical species.

3. The system of claim 1 , wherein the second bandpass filter transmits at most 45% of the filtered second electromagnetic radiation beam within the second transmittance window.

4. The system of claim 1 , wherein the second bandpass filter transmits at most 25% of the filtered second electromagnetic radiation beam within the second transmittance window.

5. The system of claim 3 , wherein the first bandpass filter transmits at least 90% of the filtered first electromagnetic radiation beam within the first transmittance window.

6. The system of claim 1 , wherein the second transmittance window width is greater than the first transmittance window width.

7. The system of claim 1 , wherein the lower limit wavelength value of the second transmittance window is greater than the upper limit wavelength value of the first transmittance window.

8. The system of claim 7 , wherein the lower limit wavelength value of the second transmittance window is at least 100 nm greater than the upper limit wavelength value of the first transmittance window.

9. The system of claim 1 , wherein the first transmittance window width is in the range of from 50 nm to 250 nm.

10. The system of claim 1 , wherein the second transmittance window width is in the range of from 275 nm to 500 nm.

11. The system of claim 1 , wherein a lower limit wavelength value of the first transmittance window is at least 3 microns and the upper limit wavelength value of the first transmittance window is at most 3.5 microns.

12. The system of claim 11 , wherein a lower limit wavelength value of the second transmittance window is at least 3.7 microns and the upper limit wavelength value of the second transmittance window is at most 4.5 microns.

13. The system of claim 1 , wherein the first electromagnetic radiation detector and the second electromagnetic radiation detector are configured to receive or generate a master clock signal to synchronize a frame rate and/or integration time between the first electromagnetic radiation detector and the second electromagnetic radiation detector.

14. A method of detecting at least one chemical species comprising:
splitting a beam of electromagnetic radiation into at least a first electromagnetic radiation beam and a second electromagnetic radiation beam;
passing at least a portion of the first electromagnetic radiation beam through a first bandpass filter, wherein the first bandpass filter is configured to receive the first electromagnetic radiation beam and transmit a filtered first electromagnetic radiation beam, the first bandpass filter transmits at least 50% of the first electromagnetic radiation beam passing through a first transmittance window, the first transmittance window having a first width including a first electromagnetic radiation wavelength range corresponding to at least a portion of a wavelength range of absorption or emission by the at least one chemical species to be detected;
passing at least a portion of the second electromagnetic radiation beam through a second bandpass filter, wherein the second bandpass filter is configured to receive the second electromagnetic radiation beam and transmit a filtered second electromagnetic radiation beam, and wherein the second bandpass filter includes a second transmittance window having a second width within a second electromagnetic radiation wavelength range, the second transmittance window having an upper limit wavelength value that is greater than an upper limit wavelength value of the first transmittance window, and wherein the second bandpass filter transmits a lesser percentage of the second electromagnetic radiation beam passing through the second transmittance window than the first bandpass filter transmits of the first electromagnetic radiation beam passing through the first transmittance window;
receiving at least a portion of the filtered first electromagnetic radiation beam with a first electromagnetic radiation detector;
receiving at least a portion of the filtered second electromagnetic radiation beam with a second electromagnetic radiation detector;
generating at least one image of the filtered first electromagnetic radiation beam detected by the first electromagnetic radiation detector and at least one image of the filtered second electromagnetic radiation beam detected by the second electromagnetic radiation detector; and
determining the presence of the at least one chemical species based, at least in part, on the images.

15. The method of claim 14 further comprising generating a resultant image from the at least one image from the first electromagnetic radiation detector and the at least one image from the second electromagnetic radiation detector.

16. The method of claim 14 , wherein a first plurality of images from the first electromagnetic radiation detector and a second plurality of images from the second electromagnetic radiation detector are generated; and the presence of at least one chemical species is determined based, at least in part, on the first plurality of images and the second plur

Assignees

• Morris Jonathan M
• Zeng Yousheng
• Exxonmobil Upstream Res Co

Inventors

• Morris Jonathan M
• Zeng Yousheng

Classifications

• G01N2021/3177

  Use of spatially separated filters in simultaneous way · CPC title

• G02B27/10

  Beam splitting or combining systems (polarising systems G02B27/28; mixing and splitting light signals using optical waveguides G02B6/28; {beam shaping, e.g. changing the cross-sectional area, by dividing or superposing multiple light beams G02B27/0905}) · CPC title

• G02B5/208

  for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation · CPC title

• G01M3/22

  for pipes, cables or tubes; for pipe joints or seals; for valves; {for welds; for containers, e.g. radiators} · CPC title

• G01N2201/068

  Optics, miscellaneous · CPC title