METHOD AND SYSTEM FOR GAS DETECTION

摘要

A gas sensor is used for determining a concentration of a predetermined gas in a measurement volume (104). The gas sensor comprises a light source (100) and a detector (114) arranged to receive light that has passed through the measurement volume. During a first measurement period, the detector (114) is used to make a first measurement of an amount of light received in at least one wavelength band which is absorbed by the gas. The first measurement is compared to a predetermined threshold value. If the threshold is crossed,during a second measurement period the detector (114) is used to make a second measurement of an amount of light received in at least one wavelength band which is absorbed by the gas. The concentration of said gas in said measurement volume (104) is calculated using the first and/or second measurement.