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
CN110832350AActive Publication Date: 2020-02-21HRL LAB
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
HRL LAB
Publication Date
2020-02-21

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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.
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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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