Risultati scientifici

Two-tone frequency modulation spectroscopy for ambient-air trace gas detection using a portable difference-frequency source around 3 mu m

Anno: 2006

Autori: Maddaloni P., Malara P., Gagliardi G., De Natale P.

Affiliazione autori: CNR – Istituto Nazionale di Ottica Applicata and European Laboratory for Non-Linear Spectroscopy, Comprensorio “A. Olivetti”, Via Campi Flegrei 34, 80078 Pozzuoli (NA), Italy

Abstract: We report a portable, widely tunable, mW-power mid-infrared spectrometer based on difference-frequency generation in a periodically poled lithium-niobate crystal, realized in a compact and robust design. The analytical performance for real-time monitoring of natural-abundance trace gases in ambient air is evaluated, pointing out the possibility of field applications. In a direct-absorption scheme, a minimum detectable concentration of 3 ppb Hz(-1/2) is demonstrated around 3.3 mu m for methane at atmospheric pressure. The sensitivity is further improved by using a two-tone frequency modulation spectroscopy technique that provides an enhancement of a factor of 100 in the signal-to-noise ratio, thus yielding a minimum absorption coefficient of 5.3×10(-9) cm(-1) Hz(-1/2).

Giornale/Rivista: APPLIED PHYSICS B-LASERS AND OPTICS

Volume: 85 (2-3)      Da Pagina: 219  A: 222

Parole chiavi: Absorption; Air; Atmospheric pressure; Crystals; Gases; Lithium niobate; Methane; Signal to noise ratio; Spectroscopic analysis; Trace analysis, Absorption coefficient; Frequency modulation spectroscopy technique; Real-time monitoring; Trace gases, Infrared spectrometers
DOI: 10.1007/s00340-006-2299-6

Citazioni: 24
dati da “WEB OF SCIENCE” (of Thomson Reuters) aggiornati al: 2022-01-23
Riferimenti tratti da Isi Web of Knowledge: (solo abbonati)
Link per visualizzare la scheda su IsiWeb: Clicca qui
Link per visualizzare la citazioni su IsiWeb: Clicca qui

gdpr-image
This site uses cookies. If you decide to continue browsing we consider that you accept their use. For more information about cookies and how to delete them please read our Info Policy on cookies use.
Read more