Phase-controlled Fourier-transform Infrared Spectroscopy with Cantilever-enhanced Photoacoustic Detection

Cantilever-enhanced photoacoustic spectroscopy (CEPAS) is an extremely sensitive spectroscopic technique and capable of broadband measurements [1]. For example, it has been combined with Fourier-transform infrared spectroscopy (FTIR), where the power of each frequency component in the optical spectr...

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Bibliographic Details
Published in2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) p. 1
Main Authors Larnimaa, Santeri, Roiz, Mikhail, Vainio, Markku
Format Conference Proceeding
LanguageEnglish
Published IEEE 26.06.2023
Subjects
Acoustic measurements
Acoustics
Frequency modulation
Sensitivity
Spectroscopy
Time-frequency analysis
Ultraviolet sources
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Summary:Cantilever-enhanced photoacoustic spectroscopy (CEPAS) is an extremely sensitive spectroscopic technique and capable of broadband measurements [1]. For example, it has been combined with Fourier-transform infrared spectroscopy (FTIR), where the power of each frequency component in the optical spectrum is modulated at a unique radio or acoustic frequency [2]. The power modulations are transformed into pressure waves by absorption inside the sample cell and detected by the sensitive silicon-cantilever microphone of the CEPAS detector. Due to the sensitivity of CEPAS, the detection bandwidth is limited to low acoustic frequencies (< 1\ \text{kHz}) leading to the necessity of slow interferometer scans and long measurement times.
ISSN:2833-1052
DOI:10.1109/CLEO/Europe-EQEC57999.2023.10232537