High altitude ice particle detection method and system
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G01J-003/44
G01S-017/95
출원번호
US-0033202
(2013-09-20)
등록번호
US-9116243
(2015-08-25)
발명자
/ 주소
Brown, Robert G.
출원인 / 주소
Rockwell Collins, Inc.
대리인 / 주소
Gerdzhikov, Angel N.
인용정보
피인용 횟수 :
5인용 특허 :
2
초록▼
An optical system for detection of atmospheric ice particles is described. The optical system includes a laser light source configured to emit laser light, a photodetector, a first lens element and detection electronics. The first lens element is arranged to image light from the laser light source o
An optical system for detection of atmospheric ice particles is described. The optical system includes a laser light source configured to emit laser light, a photodetector, a first lens element and detection electronics. The first lens element is arranged to image light from the laser light source onto a measurement volume, and to direct scattered light received from the measurement volume to the photodetector. The detection electronics is connected to the photodetector, and is configured to receive a light detection signal from the photodetector and to indicate whether or not the atmospheric ice particles exist in the measurement volume based on the light detection signal.
대표청구항▼
1. An optical system for detection of atmospheric ice particles, comprising: a laser light source configured to emit laser light;a photodetector;a first lens element arranged to image light from the laser light source onto a measurement volume, and to direct scattered light received from the measure
1. An optical system for detection of atmospheric ice particles, comprising: a laser light source configured to emit laser light;a photodetector;a first lens element arranged to image light from the laser light source onto a measurement volume, and to direct scattered light received from the measurement volume to the photodetector; anddetection electronics, connected to the photodetector, and configured to receive a light detection signal from the photodetector and to indicate whether or not the atmospheric ice particles exist in the measurement volume based on the light detection signal,wherein the detection electronics is configured to detect the existence of ice particles based on the ratio of two Raman shifted wavelengths, and based on a depolarization coefficient of two orthogonal polarization components of backscattered light which is unshifted in wavelength. 2. The optical system of claim 1, wherein the first lens element is less than about 10 cm in diameter. 3. The optical system of claim 1, wherein the laser light source comprises a pulsed laser configured to be repetitively pulsed at a pulse repetition frequency. 4. The optical system of claim 3, wherein the pulsed laser is configured to be operated in q-switched or mode-locked mode. 5. The optical system of claim 3, wherein the pulsed laser is a YAG-based laser, or a CO2 laser. 6. The optical system of claim 1, wherein first lens element comprises a single lens system. 7. The optical system of claim 6, wherein the first lens element comprises an annular, core-drilled lens. 8. The optical system of claim 1, wherein the laser light source is configured to emit laser light which is plane polarized or circularly polarized. 9. The optical system of claim 1, further comprising a spatial filter arranged to pass the scattered light directed by the first lens element and to reduce background noise light. 10. The optical system of claim 1, wherein the photodetector comprises a first photodetector and a second photodetector, and further comprising a polarizing beamsplitter arranged to split the scattered light directed by the first lens element into the two orthogonal polarization components, and to direct the two orthogonal polarization components to the first photodetector and the second photodetector, respectively. 11. The optical system of claim 1, wherein the photodetector comprises an avalanche photodiode. 12. The optical system of claim 11, wherein the avalanche photodiode is used in Geiger mode. 13. The optical system of claim 1, wherein the detection electronics is configured to pulse the photodetector on/off in synchronism with laser pulses from the laser light source being off/on, such that the photodetector is turned off when the laser pulses are inside the optical system or in close vicinity to the optical system. 14. The optical system of claim 1, wherein the detection electronics is configured to scan the laser light angularly through space and to time gate the photodetector on and off, and to construct a three-dimensional plot including range and spatial location of the ice particles based on the scan and time gating. 15. A system comprising a land-based, air-borne or sea-born vehicle, where the optical system of claim 1 is mounted on the vehicle. 16. The system of claim 15, wherein the detection electronics is configured to operate the laser beam power of the laser light to be eye safe to passengers in another vehicle who are at risk of accidentally being irradiated by the laser light, at a range of approximately 9 km. 17. An optical system for detection of atmospheric ice particles, comprising: a laser light source configured to emit laser light;a photodetector;a first lens element arranged to image light from the laser light source onto a measurement volume, and to direct scattered light received from the measurement volume to the photodetector;detection electronics, connected to the photodetector, and configured to receive a light detection signal from the photodetector and to indicate whether or not the atmospheric ice particles exist in the measurement volume based on the light detection signal; anda laser frequency shifting element arranged in a laser beam path of the laser light, wherein the detection electronics is configured to measure the relative frequency shift of the scattered laser light, and to determine the velocities of particles in the measurement volume based on the relative frequency shift, wherein the detection electronics is configured to detect and quantify Clear Air Turbulence (CAT) based on the measured relative frequency shift of the scattered laser light. 18. A method for detection of atmospheric ice particles, comprising: imaging laser light onto a measurement volume;directing scattered light received from the measurement volume to a photodetector; andindicating whether or not the atmospheric ice particles exist in the measurement volume based on a light detection signal from the photodetector, which is based on the ratio of two Raman shifted wavelengths, and based on a depolarization coefficient of two orthogonal polarization components of backscattered light which is unshifted in wavelength.
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이 특허에 인용된 특허 (2)
Pope, John; Buttry, Daniel; Toews, Arthur R., Detection of aircraft icing.
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