| 摘要 |
A method for determining corrected gas flow values from measured physical gas flow values is provided. A laser-based sensor system (30) is deployed in a duct (26) through which the gas moves. The sensor system (30) includes two or more pairs of photoemitters/photodetectors (42,44,50,52) that emit and detect light beams. Spectral changes in the light beams associated with the laser sensor system (30) caused by the properties of the gas passing through the duct (26) are referenced to known gas physical properties, including density. That information as well as the velocity of the gas and the temperature in the duct (26) are analyzed and manipulated in a programmed processing unit (38). The processing unit (38) is programmed to calculate a corrected gas flow value from the information obtained directly and indirectly from the detected light beams. The system and the method for obtaining the corrected flow value are suitable for use in the determination of corrected airflow through a duct (26), including a duct (26) of an aircraft engine (10).
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