Release Time:2019-03-09  Hits:

Indexed by: Journal Article

Date of Publication: 2011-05-01

Journal: APPLIED PHYSICS B-LASERS AND OPTICS

Included Journals: EI、SCIE、Scopus

Volume: 103

Issue: 2

Page Number: 263-269

ISSN: 0946-2171

Abstract: A new detection method for ammonia in high concentration of CO(2) and H(2)O is reported, which uses a wavelength modulated photoacoustic spectrometer based on a near-infrared tunable erbium-doped fiber laser in combination with an optical fiber amplifier. The multi-wavelength (1522.44 nm, 1522.94 nm and 1545.05 nm) photoacoustic signal measurement is established to detect multi-spectrum signal in samples. The problem of ammonia detection in high concentration of CO(2) and H(2)O is resolved at atmospheric pressure. The minimum detection limit of 16 ppb (signal-to-noise ratio = 1) in simulated breath samples (5.3% CO(2) and 6.2% H(2)O (100% relative humidity at 37A degrees C)) is achieved.