Cavity-based absorption spectroscopy techniques

Orr, Brian J.; He, Yabai

doi:10.1533/9780857098733.2.167

Laser Spectroscopy for Sensing 2014

DOI: 10.1533/9780857098733.2.167

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Cavity-based absorption spectroscopy techniques

Brian J. Orr

Yabai He

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Cited by 2 publications

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A comprehensive guide to intracavity absorption spectroscopy

Fjodorow

2024

Appl. Phys. B

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The enormous sensitivity of intracavity absorption spectroscopy (ICAS), as well as its unique ability to tolerate high broadband losses caused by, e.g., optical windows and light scattering, is being exploited by only a few research groups worldwide. The reason seems to be the lack of comprehensive literature, such that the field remains difficult to access for non-experts, in particular for engineers and chemists, who might derive the most benefits from applying ICAS. In particular, the missing connection to this target audience appears to be two-fold: (i) the seeming complexity of the theory, and (ii) the necessity to setup homemade laser systems. However, once some basic understanding and knowledge is obtained, both aspects appear to be of similar complexity as with other spectroscopic techniques. Therefore, the current work is aiming at (i) providing a comprehensive review of the theoretical basics of ICAS, and (ii) describing the most important practical aspects that need to be considered for a successful realization of ICAS measurements. To ensure maximum clarity, illustrative practical examples of recent work are used throughout the paper.

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A comprehensive guide to intracavity absorption spectroscopy

Fjodorow

2024

Appl. Phys. B

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Development of an in situ analysis system for methane dissolved in seawater based on cavity ringdown spectroscopy

Yan

et al. 2020

Review of Scientific Instruments

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This paper reports the development of a compact in situ real-time concentration analysis system for methane dissolved in seawater by using a continuous-wave cavity ringdown spectroscopy (CRDS) technique. The miniaturized design of the system, including optical resonance cavity and control and data acquisition-analysis electronics, has a cylindrical dimension of 550 mm in length and 100 mm in diameter. Ringdown signal generation, data acquisition and storage, current driver, and temperature controller of the diode laser are all integrated in the miniaturized system circuits, with an electrical power consumption of less than 12 W. Fitting algorithms of the ringdown signal and spectral line are implemented in a digital signal processor, which is the main control chip of the system circuit. The detection sensitivity for methane concentration can reach 0.4 ppbv with an approximate averaging time of 240 s (or 4 min). Comparing the system’s measurement of ambient air against a high-quality commercial CRDS instrument has demonstrated a good agreement in results. In addition, as a “proof of concept” for measuring dissolved methane, the developed instrument was tested in an actual underwater environment. The results showed the potential of this miniaturized portable instrument for in situ gas sensing applications.

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Cavity-based absorption spectroscopy techniques

Cited by 2 publications

References 271 publications

A comprehensive guide to intracavity absorption spectroscopy

A comprehensive guide to intracavity absorption spectroscopy

Development of an in situ analysis system for methane dissolved in seawater based on cavity ringdown spectroscopy

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