초록 ▼

A method for determining corrected gas flow values from measured physical gas flow values is provided. A laser-based sensor system is deployed in a duct through which the gas moves. The sensor system includes two or more pairs of photoemitters/photodetectors that emit and detect light beams. Spectra

A method for determining corrected gas flow values from measured physical gas flow values is provided. A laser-based sensor system is deployed in a duct through which the gas moves. The sensor system includes two or more pairs of photoemitters/photodetectors that emit and detect light beams. Spectral changes in the light beams associated with the laser sensor system caused by the properties of the gas passing through the duct 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 are analyzed and manipulated in a programmed processing unit. The processing unit 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, including a duct of an aircraft engine.

대표청구항 ▼

1. A method of generating a corrected gas flow value from a physical gas flow value for a gas moving through a duct, the method comprising the steps of:applying a laser-based sensor to an interior of the duct; measuring the physical gas flow value WPhysical of the gas with the laser-based sensor; me

1. A method of generating a corrected gas flow value from a physical gas flow value for a gas moving through a duct, the method comprising the steps of:applying a laser-based sensor to an interior of the duct; measuring the physical gas flow value WPhysical of the gas with the laser-based sensor; measuring with said laser-based sensor a static temperature T, a gas density ", and a velocity v of the gas in said interior of said duct; obtaining a standard day-value temperature T0 and a standard day-value pressure P0; and calculating the corrected gas flow value WCorr from the measured physical gas flow value, the static temperature T, the gas density ", the velocity v of the gas in said interior of said duct, the standard day-value temperature T0, and the standard day-value pressure P0.