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A cw lidar wind velocity sensor for operation on a stratospheric vehicle

A wind speed sensor and lidar technology, which can be used in fluid speed measurement, instruments, and re-radiation to solve problems such as high power consumption

Active Publication Date: 2020-02-21
HRL LAB
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this system is heavy and power-hungry, and its scatter returns have a wide bandwidth, which limits the sensitivity of the method

Method used

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  • A cw lidar wind velocity sensor for operation on a stratospheric vehicle
  • A cw lidar wind velocity sensor for operation on a stratospheric vehicle
  • A cw lidar wind velocity sensor for operation on a stratospheric vehicle

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Embodiment Construction

[0056] In the following description, numerous specific details are set forth in order to clearly describe various specific embodiments disclosed herein. However, it will be understood by those skilled in the art that the presently claimed invention may be practiced without all of the specific details discussed below. In other instances, well-known features have not been described in order not to obscure the invention.

[0057] Embodiments of the present presentation relate to a LIDAR sensor system designed to detect wind speed in close proximity to the sensor, up to about 5 km from the sensor. The sensor system is lightweight and capable of operating within a limited power budget, and can be carried by, for example, a balloon or other stratospheric vehicle. Wind speed sensing in the stratosphere is performed by measuring the Doppler shift of the optical probe beam as it scatters back to the sensor. In the stratosphere, the Doppler shift is controlled by Rayleigh scattering, ...

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Abstract

A continuous wave (CW) heterodyne light detection and ranging (LIDAR) air velocity sensor system that comprises a first light emitting structure arranged to send a signal light in a first direction inspace; a second light emitting structure arranged to produce a local oscillator light having a wavelength different from the wavelength of the signal light by a predetermined wavelength; a receiver arranged to receive light from said first direction in space; and a first optical mixer for mixing the received light with said local oscillator light.

Description

[0001] 【Related application】 [0002] This application claims priority to US Provisional Application No. 62 / 517804, filed June 9, 2017, which is hereby incorporated by reference. 【Technical field】 [0003] This introduction deals with Lidar (LIDAR) systems, specifically a continuous wave (CW) LIDAR set up to detect wind speed. 【Background technique】 [0004] Two methods have been previously used for stratospheric wind velocity determination: coherent pulse Doppler (Doppler) LIDAR and incoherent pulse Doppler LIDAR. However, a fundamental disadvantage of coherent pulsed Doppler LIDAR is the required pulsed laser, especially for stratospheric wind velocity sensing, since the required laser pulse length has an opposite criterion. On the one hand, short pulses (such as <1 ns) are optimal for high power, efficiency and repeatability. On the other hand, to have sufficient frequency resolution for wind velocity measurements, long pulses (such as >100 ns) are required. Any ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01S17/95G01S7/491G01S17/58G01S7/481
CPCG01P5/26G01S7/4917G01S17/95G01S17/58Y02A90/10G01S7/483G01P13/02
Inventor 詹姆斯·H·谢夫纳理查德·M·克尔默雷蒙德·萨基西安安德鲁·C·基夫帕梅拉·R·派特森艾瑞克·S·丹尼尔布瑞恩·N·利姆科特凯吉尔莫·A·海雷拉凯万·R·萨耶奥列格·M·叶菲莫夫
Owner HRL LAB
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