Optical device for detection of an agent

Patent metadata

Field	Value
Publication number	US-8928883-B1
Application number	US-94848510-A
Country	US
Kind code	B1
Filing date	Nov 17, 2010
Priority date	Jul 7, 2009
Publication date	Jan 6, 2015
Grant date	Jan 6, 2015

Abstract

In certain embodiments, a system for detecting an agent includes a resonator device configured to receive an agent. The resonator device is also configured to transmit light received from a light source, the transmitted light having an altered peak wavelength due to the presence of the received agent. The system further includes a filter device configured to filter the transmitted light having the altered peak wavelength such that the transmitted light having the altered peak wavelength does not reach one or more detectors of a detector array configured to receive transmitted light not filtered by the filter device. The system further includes a processing system operable to determine that the one or more detectors of the detector array are not generating a signal, the absence of the signal being generated by the one or more detectors of the detector array indicating the presence of the agent.

First claim

What is claimed is:

1. An agent detection system, comprising:
a resonator device configured to:
receive an agent;
transmit light received from a light source, the transmitted light having an altered peak wavelength due to the presence of the received agent, the altered peak wavelength being different than a known peak wavelength of light transmitted by the resonator device in the absence of the received agent;

a filter device configured to filter the transmitted light having the altered peak wavelength such that the transmitted light having the altered peak wavelength does not reach one or more detectors of a detector array configured to receive transmitted light not filtered by the filter device, the filter device configured to receive the transmitted light from the resonator device and filter the transmitted light having a peak wavelength outside a first range of peak wavelengths, the known peak wavelength being within the first range and the altered peak wavelength being outside the first range; and
a processing system operable to determine that the one or more detectors of the detector array are not generating a signal, the absence of the signal being generated by the one or more detectors of the detector array indicating the presence of the agent.

2. The system of claim 1 , wherein the detector array comprises a focal plane array (FPA).

3. The system of claim 1 , wherein:
the filter device is operable to receive an amount of signal in response to the determination that the one or more detectors of the detector array are not generating a signal, the received amount of signal causing the filter device to filter the transmitted light having a peak wavelength outside a second range of peak wavelengths, the altered peak wavelength being within the second range of peak wavelengths; and
the system further comprises the detector array comprising the one or more detectors, the one or more detectors operable to:
receive the transmitted light having the altered peak wavelength; and
generate a signal corresponding to the received transmitted light having the altered peak wavelength.

4. The system of claim 3 , wherein the processing system is further operable to:
access the amount of signal applied to the filter device;
determine, based on the amount of signal applied to the filter device, a wavelength shift corresponding to the difference between the known peak wavelength and the altered peak wavelength;
compare the determined wavelength shift with a number of wavelength shifts corresponding to a number of known agents; and
identify the agent based on the comparison.

5. The system of claim 3 , wherein:
the light transmitted by the resonator device has an altered intensity due to the presence of the received agent, the altered intensity being less than a known intensity of light transmitted by the resonator device in the absence of the received agent;
the one or more detectors of the detector array are further operable to generate an altered signal corresponding to light having the altered intensity;
the processing system is further operable to:
access the amount of signal applied to the filter device;
determine, based on the amount of signal applied to the filter device, a wavelength shift corresponding to the difference between the known peak wavelength and the altered peak wavelength;
access the altered signal generated by the detector array;
determine an amount of light absorbed by the agent by comparing the altered signal with a known signal corresponding to the known intensity;
compare the determined wavelength shift with wavelength shifts corresponding to a number of known agents and compare the determined amount of light absorbed with absorption characteristics of a number of known agents; and
identify the threat agent based on the comparisons.

6. The system of claim 4 , wherein the processing system comprises a read-out integrated circuit (ROIC) coupled to the detector array.

7. The system of claim 1 , wherein the resonator device comprises chalcogenide glass.

8. The system of claim 1 , wherein the resonator device comprises an optical cavity.

9. The system of claim 1 , wherein the light source comprises an on-chip quantum dot light-emitting diode (LED).

10. The system of claim 1 , wherein the light source comprises an on-chip laser.

11. A method for detecting an agent, comprising:
receiving, at a resonator device, an agent;
transmitting, from the resonator device, light received from a light source, the transmitted light having an altered peak wavelength due to the presence of the received agent, the altered peak wavelength being different than a known peak wavelength of light transmitted by the resonator device in the absence of the received agent;
filtering the transmitted light having the altered peak wavelength at a filter device such that the transmitted light having the altered peak wavelength does not reach one or more detectors of a detector array configured to receive transmitted light not filtered by the filter device, the filter device configured to receive the transmitted light from the resonator device and filter the transmitted light having a peak wavelength outside a first range of peak wavelengths, the known peak wavelength being within the first range and the altered peak wavelength being outside the first range; and
determining, using a processing system, that the one or more detectors of the detector array are not generating a signal, the absence of the signal being generated by the one or more detectors of the detector array indicating the presence of the agent.

12. The method of claim 11 , wherein the detector array comprises a focal plane array (FPA).

13. The method of claim 11 , further comprising:
receiving, at the filter device, an amount of signal in response to the determination that the one or more detectors of the detector array are not generating a signal, the received amount of signal causing the filter device to filter the transmitted light having a peak wavelength outside a second range of peak wavelengths, the altered peak wavelength being within the second range of peak wavelengths;
receiving, at the detector array, the transmitted light having the altered peak wavelength; and
generating, using the one or more detectors of the detector array, a signal corresponding to the received transmitted light having the altered peak wavelength.

14. The method of claim 13 , further comprising:
accessing, using a processing system, the amount of signal applied to the filter device;
determining, based on the amount of signal applied to the filter device, a wavelength shift corresponding to the difference between the known peak wavelength and the altered peak wavelength;
comparing the determined wavelength shift with a number of wavelength shifts corresponding to a number of known agents; and
identifying the agent based on the comparison.

15. The method of claim 13 , wherein:
the light transmitted by the resonator device has an altered intensity due to the presence of the received agent, the altered intensity being less than a known intensity of light transmitted by the resonator device in the absence of the received agent;
the method further comprising:
generating, using one or more detectors of the detector array, an altered signal corresponding to the transmitted light having the altered intensity;
accessing, using a processing system, the amount of signal applied to the filter device;
determining, based on the amount of signal applied to the filter device, a wavelength shift corresponding to the difference between the known peak wavelength

Assignees

• Jaworski Frank B
• Wehner Justin Gordon Adams
• Kennedy Adam M
• Williams Darin S
• Agarwal Anuradha Murthy
• Hu Juejun
• Raytheon Co

Inventors

• Jaworski Frank B
• Wehner Justin Gordon Adams
• Kennedy Adam M
• Williams Darin S
• Agarwal Anuradha Murthy
• Hu Juejun

Classifications

• G01N2021/7776

  Index · CPC title

• G01N21/7746 Primary

  the waveguide coupled to a cavity resonator · CPC title