Absorption spectroscopy apparatus

The direct absorption spectroscopy apparatus with a modulated laser drive current and polarization-insensitive optics addresses environmental challenges for accurate and fast gas concentration measurements, offering robust and compact long-distance monitoring.

WO2025247925A1 Publication Date: 2025-12-04DANMARKS TEKNISKE UNIV
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Patent Information

Application Number
PCT/EP2025/064683
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2024-05-29
Filing Date
2025-05-27
Publication Date
2025-12-04

AI Technical Summary

Technical Problem

Existing absorption spectroscopy systems face challenges in achieving fast and accurate gas concentration measurements in harsh outdoor environments due to sensitivity to noise, mechanical vibrations, and complexity, while also requiring compact and easy-to-install designs for long-distance gas monitoring.

Method used

A direct absorption spectroscopy apparatus using a wavelength-tunable laser source driven by a modulated, pulsed electrical current with non-rectangular pulse shapes to quickly toggle between wavelengths, combined with a polarization-insensitive optical system and reference photodetectors for stable measurements.

Benefits of technology

The apparatus provides accurate, fast, and robust gas concentration measurements despite environmental changes, with high sensitivity and reduced noise, enabling compact and flexible long-distance gas monitoring.

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Abstract

The present invention relates in one aspect to an absorption spectroscopy apparatus for measuring one or more gases in an atmosphere, wherein the apparatus comprises a wavelength-tunable laser source, a control circuit configured to provide an electrical drive current to the wavelength-tunable laser source; wherein the control circuit is configured to create the electrical drive current as a modulated drive current, wherein the modulated drive current alternates between at least a first and a second drive current, the first drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a first wavelength and the second drive current configured to cause the wavelength-tunable laser source to emit laser radiation at a second wavelength, different from the first wavelength, and wherein the modulated drive current defines a sequence of pulses, each pulse having a non-rectangular pulse shape.
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