Active multiple-color imaging polarimetry
First Claim
Patent Images
1. A system for remotely imaging a sample, using optical radiation reflected/scattered from the sample, comprising:
- a first source configured to emit first optical radiation with a first polarization and that varies at a first frequency;
a second source configured to emit second optical radiation with a second polarization and that varies at a second frequency;
a focal planar array (FPA) configured to detect the first and second optical radiation after interaction with the sample and generate a single detection signal;
a first lock-in amplifier configured to process the single detection signal based on the first frequency to produce a first output signal; and
a second lock-in amplifier configured to process the single detection signal based on the second frequency to produce a second output signal,wherein the FPA detects the first and second optical radiation free-of image mis-registration.
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Abstract
Remotely sensing a target may include generating a first beam of optical radiation that is modulated at a first frequency and polarized at a first polarization. A second beam of optical radiation that is modulated at a second frequency and polarized at a second polarization may also be generated. The first and second beams of optical radiation may be transmitted to the target. Radiation at the first polarization and radiation at the second polarization may be detected from the target using a phase sensitive technique and the first and second frequencies.
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Citations
20 Claims
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1. A system for remotely imaging a sample, using optical radiation reflected/scattered from the sample, comprising:
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a first source configured to emit first optical radiation with a first polarization and that varies at a first frequency; a second source configured to emit second optical radiation with a second polarization and that varies at a second frequency; a focal planar array (FPA) configured to detect the first and second optical radiation after interaction with the sample and generate a single detection signal; a first lock-in amplifier configured to process the single detection signal based on the first frequency to produce a first output signal; and a second lock-in amplifier configured to process the single detection signal based on the second frequency to produce a second output signal, wherein the FPA detects the first and second optical radiation free-of image mis-registration. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of remotely imaging a sample, using optical radiation reflected/scattered from the sample, comprising:
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transmitting a first beam of optical radiation toward the sample, the first beam having a first polarization and an amplitude varying at a first frequency; transmitting a second beam of optical radiation toward the sample, the second beam having a second polarization different from the first polarization and an amplitude varying at a second frequency different from the first frequency; detecting, using a FPA, the first and second beams of optical radiation after interaction with the sample to produce a detection signal, wherein the first and second beams of optical radiation are detected by the FPA free-of image mis-registration; determining a first portion of the detection signal that is present at the first frequency; determining a second portion of the detection signal that is present at the second frequency; and obtaining polarization information about the sample based on the first portion of the detection signal and the second portion of the detection signal. - View Dependent Claims (8, 9, 10, 11)
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12. A system for remotely imaging a sample, using optical radiation reflected/scattered from the sample, comprising:
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a plurality of sources configured to emit optical radiation, each one of the plurality of sources being configured to emit radiation at a different frequency and a different polarization from other ones of the plurality of sources; a single FPA configured to detect the optical radiation from the plurality of sources after interaction with the sample and generate a detection signal wherein the plurality of sources are detected by the FPA free-of image mis-registration; and a plurality of lock-in amplifiers corresponding to the plurality of sources and respectively configured to generate components of the detection signal that are present at the different frequencies, wherein the components of the detection signal correspond to radiation from the sample at the different polarizations. - View Dependent Claims (13, 14, 15, 16)
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17. A method of remotely imaging a target using optical radiation reflected/scattered from the target, comprising:
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generating a first beam of optical radiation that is modulated at a first frequency and polarized at a first polarization; generating a second beam of optical radiation that is modulated at a second frequency and polarized at a second polarization; transmitting the first and second beams of optical radiation to the target; and detecting, free-of image mis-registration on an FPA, radiation at the first polarization and radiation at the second polarization from the target using a phase sensitive technique and the first and second frequencies. - View Dependent Claims (18, 19, 20)
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Specification