Software-Controlled High-Resolution Laser Photoacoustic Spectrometer: Techniques and Programs for Measuring and Processing Weak Absorption Spectra of Atmospheric Gases
A software-controlled photoacoustic spectrometer designed on the basis of a TEC-520 diode laser (output power 30 mW, coarse tuning range 6060–6600 cm−1, bandwidth ∼5 × 10–5 cm−1, fine tuning range is 0–2.5 cm−1), WS-UIR laser wavelength meter (relative error Δλ/λ ∼ 10–8), and resonance photoacoustic detector with a threshold sensitivity of ∼3 × 10–10 W cm−1 Hz−1/2 is described, as well as techniques and software developed for measurements and spectra processing. The water vapor spectra are analyzed.
Keywords:absorption spectrum diode laser photoacoustic detector mirror modulator
We are grateful to Yu.N. Ponomarev and I.V. Ptashnik for assistance in the purchase of equipment and support in the research, A.E. Protasevich for his help in programming the line profile model, and A.N. Kuryak for assistance in the design and manufacture of DPAD.
This work was partly supported by Russian Science Foundation (project no. 16-17-10096 (purchase of the diode laser, piezoelectric amplifier, and vacuum sensor and experiments) and Programs II.10.3 and II.10.3.6 (purchase of the wavelength meter, manufacture of amplifiers and power sources, and experiments).
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