Fluorescence lifetime characteristic value extraction method and system based on Mie scattering and fluorescence emission dual-channel signals

The dual-channel mie scattering and fluorescence emission signal method allows for the extraction of fluorescence lifetime features in laser radar systems, overcoming the limitations of existing techniques and enhancing system stability and robustness.

CN119715477AActive Publication Date: 2025-03-28BEIJING INST OF TECH
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Patent Information

Application Number
CN202411832956.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-12
Publication Date
2025-03-28
Estimated Expiration
2044-12-12

AI Technical Summary

Technical Problem

Current time-resolved fluorescence lifetime measurement techniques using picosecond-level narrow pulse lasers are limited by the requirement for a pulse width much shorter than the fluorescence lifetime, which is not met in laser radar applications, preventing the measurement of fluorescence lifetime characteristics.

Method used

A method and system utilizing dual-channel signals from laser radar systems, including mie scattering and fluorescence emission signals, to extract fluorescence lifetime features, employing a simulation model and iterative refinement to determine the fluorescence lifetime, allowing for measurement with nanosecond-level pulse widths and enhancing robustness to environmental and system changes.

Benefits of technology

Enables the measurement of fluorescence lifetime in laser radar applications with nanosecond-level pulse widths, improving the stability and robustness of the system to atmospheric and parameter changes.

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Abstract

The invention discloses a fluorescence lifetime characteristic value extraction method and system based on a Mie scattering and fluorescence emission dual-channel signal, and relates to the field of atmospheric pollutant detection, and the method comprises the steps: obtaining a dual-channel signal; the dual-channel signal comprises an original mie scattering signal and an original fluorescence emission signal; constructing a simulation model; setting fluorescence lifetime; taking the original mie scattering signal and the set fluorescence lifetime as the input of a simulation model to obtain a predicted fluorescence emission signal; and determining the deviation between the original fluorescence emission signal and the predicted fluorescence emission signal, returning to the step of setting the fluorescence lifetime, and taking the fluorescence lifetime corresponding to the minimum deviation as a fluorescence lifetime characteristic value extraction result when the set number of iterations is reached. The limitation that nanosecond-level long-pulse-width pulse laser cannot measure the fluorescence lifetime characteristic value can be broken through, and meanwhile, the robustness of a laser radar system to meteorological conditions and system parameter changes is greatly improved.
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