Systems and methods for optically determining an acoustic signature of an object
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01N-021/21
G02B-027/28
G01N-021/17
G02B-023/04
출원번호
US-0921501
(2018-03-14)
등록번호
US-10228323
(2019-03-12)
발명자
/ 주소
Hart, Michael
Watson, Zachary
출원인 / 주소
Hart, Michael
대리인 / 주소
Hayes Soloway P.C.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A photo-acoustic polarimetric remote sensing apparatus includes a telescope that directs visible light photons from an object. A polarizing beam splitter is in optical alignment with the telescope. The polarizing beam splitter has first and second pathways corresponding to first and second polarizat
A photo-acoustic polarimetric remote sensing apparatus includes a telescope that directs visible light photons from an object. A polarizing beam splitter is in optical alignment with the telescope. The polarizing beam splitter has first and second pathways corresponding to first and second polarization states, respectively. The first and second pathways are substantially perpendicular. A first photodetector is in optical alignment with the first pathway, and a second photodetector is in optical alignment with the second pathway. At least one processor is in communication with the first and second photodetectors. The at least one processor generates a signal corresponding to a degree of linear polarization of the photons over time, and the signal is indicative of an acoustic signature of the object.
대표청구항▼
1. A photo-acoustic polarimetric remote sensing apparatus, comprising: a telescope directing visible light photons from an object;a polarizing beam splitter in optical alignment with the telescope, the polarizing beam splitter having first and second pathways corresponding to first and second polari
1. A photo-acoustic polarimetric remote sensing apparatus, comprising: a telescope directing visible light photons from an object;a polarizing beam splitter in optical alignment with the telescope, the polarizing beam splitter having first and second pathways corresponding to first and second polarization states, respectively, wherein the first and second pathways are substantially perpendicular;a first photodetector in optical alignment with the first pathway;a second photodetector in optical alignment with the second pathway;at least one processor in communication with the first and second photodetectors, wherein the at least one processor generates a signal corresponding to a degree of linear polarization of the photons over time, wherein the signal is indicative of an acoustic signature of the object. 2. A photo-acoustic polarimetric remote sensing apparatus, comprising: collection optics directing photons;a polarizing beam splitter having first and second pathways, wherein photons within the first and second pathways have first and second polarization states, respectively;a first optical detector located in the first pathway;a second optical detector located in the second pathway, andat least one processor in communication with the first and second optical detectors, wherein the at least one processor: receives first and second signals from the first and second optical detectors, respectively;calculates, for a segment of the first and second signals, a difference of the first and second signals, a sum of the first and second signals, and a ratio of the difference to the sum; andgenerates, for a plurality of segments, a signal corresponding to a sequential output of the ratio for each segment, wherein the signal is indicative of an acoustic signature of an object being sensed. 3. The apparatus of claim 2, wherein the collection optics are one of: a Cassegrain, a Gregorian, a modified Dahl-Kirkham, a Keplerian, and a Ritchey-Chretien telescope. 4. The apparatus of claim 2, further comprising a light source to illuminate the object being sensed. 5. The apparatus of claim 2, further comprising a sound transducer in communication with the at least one processor, wherein the at least one processor communicates the signal indicative of an acoustic signature of the object to the sound transducer, and wherein the sound transducer generates an audible output. 6. The apparatus of claim 2, wherein the first and second detectors transmit the first and second signals at a rate of at least 10 Hz. 7. The apparatus of claim 2, wherein the generated signal comprises a power spectra measurement for the ratios over a series of time segments. 8. The apparatus of claim 2, wherein the generated signal comprises a spectrogram of detected acoustic frequencies over time. 9. A photo-acoustic, polarimetric method of remotely sensing an object, comprising the steps of: collecting photons from the object;directing the photons down first and second pathways, wherein photons within the first pathway have a first polarization state and photons within the second pathway have a second polarization state;detecting photons in the first and second pathways using at least one optical detector, wherein the photons in the first polarization state produce a first signal and the photons in the second polarization state produce a second signal;receiving, with at least one processor in communication with the at least one optical detector, a first signal and a second signal corresponding to the photons in the first pathway and second pathway, respectively;determining, with the at least one processor and for a segment of the first and second signals, a difference of the first and second signals, a sum of the first and second signals, and a ratio of the difference to the sum; andgenerating, for a plurality of segments, a signal corresponding to a sequential output of the ratio for each segment, wherein the signal is indicative of an acoustic signature of the object. 10. The method of claim 9, wherein the step of collecting photons from the object is performed using one of: a Cassegrain, a Gregorian, a modified Dahl-Kirkham, a Keplerian, and a Ritchey-Chretien telescope. 11. The method of claim 9, further comprising the step of providing a light source to illuminate the object being sensed. 12. The method of claim 9, further comprising the step of sending the signal indicative of an acoustic signature of the object to a sound transducer in communication with the at least one processor, wherein the sound transducer generates an audible output. 13. The method of claim 9, wherein the photons are directed down the first and second pathways by a polarizing beam splitter. 14. The method of claim 9, wherein the photons are directed down the first and second pathways by a polarizing prism. 15. The method of claim 9, wherein generating a signal corresponding to the sequential output of the ratio comprises determining a power spectra measurement for the ratios over a series of time segments and determining a spectrogram of detected acoustic frequencies over time. 16. A photo-acoustic polarimetric remote sensing apparatus, comprising: collection optics directing photons;a polarizing prism angularly separating the photons into a first polarization state and a second polarization state;an optical detector, wherein a first portion of the optical detector receives the photons in the first polarization state, and wherein a second portion of the optical detector receives the photons in the second polarization state; andat least one processor in communication with the optical detector, wherein the at least one processor: receives a signal from the optical detector, wherein a first portion of the signal corresponds to the photons in the first polarization state, and a second portion of the signal corresponds to the photons in the second polarization state;calculates, for a segment of the first and second signals, a difference of the first and second portions of the signals, a sum of the first and second portions of the signals, and a ratio of the difference to the sum; andgenerates, for a plurality of segments, a signal corresponding to a sequential output of the ratio for each segment, wherein the signal is indicative of an acoustic signature of an object being sensed. 17. The apparatus of claim 16, wherein the collection optics are one of: a Cassegrain, a Gregorian, a modified Dahl-Kirkham, a Keplerian, and a Ritchey-Chretien telescope. 18. The apparatus of claim 16, wherein the polarizing prism is a Wollaston prism. 19. The apparatus of claim 16, further comprising a flip mirror and an acquisition detector in communication with the at least one processor, the flip mirror located to direct the photons to the acquisition detector. 20. The apparatus of claim 16, wherein the generated signal comprises a power spectra measurement for the ratios over a series of time segments.
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