Patent ID: 7636153
Filing Date: 2009-12-22
Classification: G01N

Abstract:
1. A combined infrared (IR) gas sensor device for measuring the concentration of different target gases by using either tunable diode laser spectrometry (TDLS) or photo-acoustical (PA) detection comprising: at least one first tunable laser source generating a first modulated laser beam providing a first measuring path; at least one second tunable laser source generating a second modulated laser beam providing a second measuring path; first and second detection means associated to said first and second measuring path, respectively, wherein said first detection means is an optical sensor receiving said first laser beam, and said second detection means is an acoustical sensor; at least one measuring chamber for providing an absorption volume for a target gas to be detected, said measuring chamber comprises different openings for said first and second measuring path, and at least said second detection means; and electronic processing means for controlling said laser sources and providing resulting measuring signals.