DIRECT SENSING LIDAR SYSTEM

The direct detection LIDAR system addresses the limitations of current systems by using a radiation source with multiple spectral components and an interferometer with identical transfer functions, achieving higher peak power and improved accuracy for wind speed measurements.

FR3150871B1Active Publication Date: 2025-06-20OFFICE NAT DETUDES & DE RECH AEROSPATIALES
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Patent Information

Application Number
FR2023007264
Authority / Receiving Office
FR · FR
Patent Type
Patents
Current Assignee / Owner
Filing Date
2023-07-07
Publication Date
2025-06-20
Estimated Expiration
2043-07-07

AI Technical Summary

Technical Problem

Current direct detection LIDAR systems are bulky, heavy, sensitive to optical alignment losses, and have limitations in achieving high peak radiation power due to stimulated Brillouin scattering, making them unsuitable for wind speed measurement applications.

Method used

A direct detection LIDAR system with a radiation source assembly that produces laser radiation with multiple spectral components separated by an inter-peak spectral interval, an interferometer with identical transfer function values for all spectral components, and optical detectors to measure radiation intensity, allowing for increased signal-to-noise ratio and higher peak power.

Benefits of technology

The system achieves higher peak radiation power and improved accuracy in measuring wind speed, while being more compact, lightweight, and less sensitive to optical alignment losses compared to existing systems.

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Abstract

A direct detection LIDAR system (100) comprises a modulator (12) for imparting a comb spectrum to laser radiation that is emitted toward a target volume (T). The comb spectrum makes it possible to use fiber optic and / or integrated optical circuit technology to realize a radiation source assembly (1) of the LIDAR system, while overcoming a radiation power limit value that is due to Brillouin-stimulated scattering. A value of an inter-peak spectral interval of the emitted laser radiation is electrically selected with respect to an optical path length deviation that is effective in an interferometer (3) of the LIDAR system. In this way, all peak-shaped spectral components of a collected radiation (RC) contribute to measurement signals that are used to obtain a velocity value of a content of the target volume.Abstract Figure: Figure 1
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