IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0940228
(2010-11-05)
|
등록번호 |
US-8269191
(2012-09-18)
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발명자
/ 주소 |
- Rosen, David Lawrence
- Meyers, Ronald Everett
|
출원인 / 주소 |
- The United States of America as represented by the Secretary of the Army
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대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
5 |
초록
▼
An apparatus for determining the depolarization efficiency of a environment includes a transmitter, a receiver, and signal processing circuitry. A reference object is located within the environment at a reference distance. The transmitter includes a radiation source providing incident radiation that
An apparatus for determining the depolarization efficiency of a environment includes a transmitter, a receiver, and signal processing circuitry. A reference object is located within the environment at a reference distance. The transmitter includes a radiation source providing incident radiation that has an initial polarization as it enters the environment. The receiver receives returned radiation from the reference, which may be diffuse reflection or photoluminescence. The signal processing circuitry calculates the depolarization efficiency of the environment from the initial polarization, luminescence or final polarization, and the reference distance. A method of determining depolarization efficiency includes directing incident radiation having initial polarization through an environment onto a reference, detecting returned radiation from the reference, and calculating the depolarization efficiency using the initial polarization and the luminescence or final polarization.
대표청구항
▼
1. An apparatus for determining a depolarization efficiency of an environment comprising: a transmitter having a radiation source illuminating the reference object with incident radiation, the reference object being located in the environment a reference distance from the transmitter, the incident r
1. An apparatus for determining a depolarization efficiency of an environment comprising: a transmitter having a radiation source illuminating the reference object with incident radiation, the reference object being located in the environment a reference distance from the transmitter, the incident radiation having an initial polarization as the incident radiation enters the environment; the incident radiation causing the reference object to emit photoluminescence; the emission of the photoluminescence being dependent upon the change in polarization induced by the environment over the reference distance;a receiver, having a detector, receiving returned radiation from the reference object, the return radiation comprising photoluminescent radiation, the detector providing detector data correlated with at least one property of the photoluminescent radiation;signal processing circuitry, receiving the detector data from the detector, the signal processing circuitry being operational to determine the effect of the environment on the polarization of the electromagnetic radiation as measured by the change in degree of polarization per unit length over the reference distance based upon the initial polarization and the photoluminescent radiation. 2. The apparatus of claim 1 wherein the intensity of the photoluminescent radiation is dependent upon the polarization of the incident radiation, such that if the polarization of the incident radiation is changed by the environment, the intensity of the luminescent radiation changes to thereby indicate the depolarization caused by the environment. 3. The apparatus of claim 1 wherein the property of the photoluminescent radiation detected by the detector comprises intensity at one or more specified wavelengths. 4. The apparatus of claim 1 wherein the property of the photoluminescent radiation detected by the detector is polarization and wherein the intensity of the photoluminescent radiation is dependent upon the polarization of the incident radiation, such that if the polarization of the incident radiation is changed by the environment, the intensity of the photoluminescent radiation changes to thereby indicate the depolarization caused by the environment. 5. The apparatus of claim 1, wherein the radiation source is a laser and the reference object comprises a curved surface. 6. The apparatus of claim 1, wherein the detector is a camera for detecting spatial information for detecting changes in the intensity of polarization over the surface of the reference object. 7. The apparatus of claim 1, wherein the transmitter further comprises a polarization modulator to provide the initial polarization with a time dependence. 8. The apparatus of claim 4, wherein the signal processing circuitry is in electronic communication with the polarization modulator and with the detector. 9. The apparatus of claim 1, wherein the receiver comprises a filter which selectively transmits the photoluminescence at at least one predetermined wavelength. 10. The apparatus of claim 1, further comprising a distance measurement device operable to determine the reference distance. 11. The apparatus of claim 9, wherein the distance measurement device is a photometric device comprising one of a camera or laser pulse timing. 12. The apparatus of claim 1, wherein the receiver further comprises a lens and a narrow-band wavelength filter. 13. The apparatus of claim 1, wherein the reference object is a man-made object having a curved surface. 14. The apparatus of claim 1, wherein the reference object is a landscape feature. 15. The apparatus of claim 1, wherein: the transmitter further comprises a polarizer,the receiver further comprises an analyzer,the polarizer and analyzer have orthogonal orientations, and the returned radiation comprises diffuse reflectance occurring due to the properties of the surface of the reference object. 16. A method of determining the effect of an environment on the polarization of electromagnetic radiation as measured by the change in degree of polarization over a predetermined distance, the method comprising: providing incident radiation, the incident radiation having an initial polarization as the incident radiation enters the environment;directing the incident radiation onto a reference object; the incident radiation causing the reference object to emit photoluminescence; the emission of the photoluminescence being polarization dependent;analyzing-the photoluminescence emitted from the reference object;determining the change in degree of polarization induced by the environment over the predetermined distance based upon the initial polarization and the photoluminescence. 17. The method of claim 16, wherein the initial polarization has a time-dependent modulation. 18. The method of claim 16, wherein the provided incident radiation is laser radiation.
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