IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0484870
(2014-09-12)
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등록번호 |
US-9709499
(2017-07-18)
|
발명자
/ 주소 |
- Crafton, Jimmy W.
- Forlines, Robert A.
- Goss, Larry P.
- Palluconi, Stephen J.
- Webb, Jessica R.
- Rogoshchenkov, Nikolay
- McMillan, Grant R.
|
출원인 / 주소 |
- Innovative Scientific Solutions, Inc.
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
10 |
초록
▼
An oxygen number density or concentration sensor including a sampling luminescent oxygen probe located in a fluid environment, and a gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling
An oxygen number density or concentration sensor including a sampling luminescent oxygen probe located in a fluid environment, and a gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling and reference luminescent oxygen probes are formed by an ideal PSP. A predetermined fixed oxygen number density or concentration is provided within a medium contained in the gas impermeable enclosure. A detector receives signals corresponding to luminescent emissions of the sampling and reference probes. A processor determines a number density or concentration of oxygen in the fluid environment from a signal generated at the sampling probe with reference to an oxygen number density or concentration dependent signal generated at the reference probe.
대표청구항
▼
1. An oxygen number density or concentration sensor in a fluid environment, the sensor including: a sampling luminescent oxygen probe located in the fluid environment;at least one gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the g
1. An oxygen number density or concentration sensor in a fluid environment, the sensor including: a sampling luminescent oxygen probe located in the fluid environment;at least one gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP);a predetermined fixed oxygen number density within a medium contained in the gas impermeable enclosure, the oxygen number density within the gas impermeable enclosure is greater than 0% and less than or equal to a predetermined limit;an illumination source providing light energy to the sampling probe and the reference probe;a detector receiving signals corresponding to luminescent emissions of the sampling and reference probes; anda processor determining a number density of oxygen in the fluid environment from a signal generated at the sampling probe with reference to an oxygen number density dependent signal generated at the reference probe, wherein the processor mixes the signals from the sampling and reference probes to identify the number density of oxygen in the fluid environment based on a luminescent lifetime comparison or phase lag between the signals from the sampling and reference probes. 2. The system of claim 1, wherein the illumination source includes an LED provided to each of the sampling probe and the reference probe, and the detector includes a first detector receiving a luminescent emission of the sampling probe, and a second detector receiving a luminescent emission of the reference probe. 3. An oxygen number density or concentration sensor in a fluid environment, the sensor including: a sampling luminescent oxygen probe located in the fluid environment;a gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP);a predetermined fixed oxygen number density within a medium contained in the gas impermeable enclosure, the oxygen number density within the gas impermeable enclosure is greater than 0% and less than or equal to a predetermined limit;an illumination source providing light energy to the sampling probe and the reference probe;a detector receiving signals corresponding to luminescent emissions of the sampling and reference probes;a processor determining a number density of oxygen in the fluid environment from a signal generated at the sampling probe with reference to an oxygen number density dependent signal generated at the reference probe; andwherein the illumination source includes a red LED and a blue LED, and the red and blue LEDs provide light energy to both the sampling and the reference probes and wherein the blue LED is used to create a fluorescent emission from the sampling and reference probes corresponding to an oxygen quenching at each of the probes, and the red LED provides a reflected light signal from the sampling and reference probes that is transmitted to the detector through a long-pass filter to eliminate a system phase lag not associated with fluorescence from the sampling and reference probes. 4. The sensor of claim 3, including a sampling channel from the sampling probe to the detector and a reference channel from the reference probe to the detector, each of the sampling channel and the reference channel including a shutter for selectively controlling passage of signals from the sampling and reference probes to the detector. 5. An oxygen number density or concentration sensor in a fluid environment, the sensor including: a sampling luminescent oxygen probe located in the fluid environment;a gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP);a predetermined fixed oxygen number density within a medium contained in the gas impermeable enclosure, the oxygen number density within the gas impermeable enclosure is greater than 0% and less than or equal to a predetermined limit;an illumination source providing light energy to the sampling probe and the reference probe;a detector receiving signals corresponding to luminescent emissions of the sampling and reference probes;a processor determining a number density of oxygen in the fluid environment from a signal generated at the sampling probe with reference to an oxygen number density dependent signal generated at the reference probe; andwherein the reference probe comprises a variable volume cell that varies a pressure within the gas impermeable enclosure to equilibrate to a pressure in the fluid environment. 6. An oxygen number density or concentration sensor in a fluid environment, the sensor including: a sampling luminescent oxygen probe located in the fluid environment;at least one gas impermeable enclosure located in the fluid environment and a reference luminescent oxygen probe located within the gas impermeable enclosure, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP);a predetermined fixed oxygen number density within a medium contained in the gas impermeable enclosure, the oxygen number density within the gas impermeable enclosure is greater than 0% and less than or equal to a predetermined limit;an illumination source providing light energy to the sampling probe and the reference probe;a detector receiving signals corresponding to luminescent emissions of the sampling and reference probes; anda processor determining a number density of oxygen in the fluid environment from a signal generated at the sampling probe with reference to an oxygen number density dependent signal generated at the reference probe;wherein said at least one gas impermeable enclosure including at least two separate gas impermeable enclosures and at least two reference luminescent oxygen probes enclosed in respective ones of said separate gas impermeable enclosures, each of the gas impermeable enclosures containing oxygen at respective different number densities or concentrations and used as a reference for the signal generated at the sampling probe. 7. The system of claim 6, wherein a first of the reference probes is at a first number density or concentration for triggering a system to change the oxygen level in the fluid environment, and a second of the reference probe is at a second number density or concentration for triggering the system to discontinue changing the oxygen level in the fluid environment. 8. A method of sensing an oxygen level in a fluid environment, the method comprising: obtaining a sampling signal from a sampling luminescent oxygen probe located in the fluid environment;obtaining a reference signal from a reference luminescent oxygen probe located within a gas impermeable enclosure positioned in the fluid environment, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP);providing a light source modulated at a predetermined frequency to the sampling and reference probes;receiving the sampling and reference signals at a detector; andprocessing the sampling and reference signals to determine an oxygen level in the fluid environment based on the sampling signal with reference to the reference signal independent of varying temperature in the fluid environment;including equilibrating both the temperature and pressure of a medium contained in the gas impermeable enclosure to the temperature and pressure of the fluid environment to provide a determination of the concentration of oxygen in the fluid environment. 9. The method of claim 8, wherein the gas impermeable enclosure contains a predetermined fixed oxygen number density or concentration within a medium, the oxygen number density or concentration within the gas impermeable enclosure is greater than 0% and less than or equal to a predetermined limit. 10. The method of claim 8, wherein providing a light source includes providing light energy to the sampling probe and reference probe simultaneously from a single LED or Laser light source. 11. The method of claim 10, wherein the light source is a pulsed Laser and the sampling and reference signals are converted to a probe lifetime using multi-gate integration or direct fitting of a decay curve corresponding to fluorescent decay of the probe. 12. The method of claim 8, wherein processing the sampling and reference signals includes mixing the sampling signal with the reference signal to identify a phase lag or lifetime difference between the sampling and reference signals, and using the phase lag or lifetime difference to determine the oxygen level in the fluid environment. 13. The method of claim 8, further including: providing a long-pass filter in front of the detector;for each of the sampling and reference probes, reflecting light from a red LED off the PSP forming the sampling and reference probes, and transmitting the reflect light to the detector to produce a system phase lag signal for the sampling and reference probes;for each of the sampling and reference probes, illuminating the sampling and reference probes with a blue LED or UV light to excite the sampling and reference probes to emit phase shifted fluorescent sampling and reference signals in the red light spectrum transmitted to the detector; anddetermining a corrected sampling and reference signal for each of the sampling and reference probes by subtracting the fluorescent phase shifted signal of the sampling and reference probes from the respective system phase lag signal. 14. The method of claim 13, wherein signals from the sample and reference probes are transmitted to the detector along respective sampling and reference channels, each of channels including a shutter, and the shutters are alternately opened and closed to selectively permit passage of signals through one of the sampling and reference channels while preventing passage of signals along the other of the sampling and reference channels. 15. The method of claim 13, including subtracting the corrected reference signal from the corrected sampling signal to determine the oxygen level in the fluid environment. 16. A method of sensing an oxygen level in a fluid environment, the method comprising: obtaining a sampling signal from a sampling luminescent oxygen probe located in the fluid environment;obtaining a reference signal from a reference luminescent oxygen probe located within a gas impermeable enclosure positioned in the fluid environment;providing a predetermined fixed oxygen number density or concentration of oxygen within a medium contained in the gas impermeable enclosure;equilibrating both a temperature and a pressure of the medium within the gas impermeable enclosure to the temperature and pressure of the fluid environment;receiving the sampling and reference signals at a detector; andprocessing the sampling and reference signals to determine an oxygen level in the fluid environment based on the sampling signal with reference to the reference signal independent of varying temperature in the fluid environment. 17. The method of claim 16, wherein the sampling and reference luminescent oxygen probes are formed by an ideal pressure sensitive paint (PSP). 18. The method of claim 16, wherein the determination of the oxygen level includes determining a concentration of oxygen within the fluid environment.
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