Patent ID: 8285491
Filing Date: 2012-10-09
Classification: G01J,G01N

Abstract:
1. A device for measuring the fraction of a liquid in a wet gas flow, the device including: one or more light sources emitting at a first wavelength at which the liquid is highly absorbing and emitting at a second wavelength close to the first wavelength and at which the liquid is not highly absorbing; and one or more sensor for detecting the transmittance of the light at the first and second wavelengths through said gas flow, the device further including processing means for determining a liquid fraction of the liquid in the wet gas flow by correcting the transmittance measured at the first wavelength for the effects of scattering using the transmittance measured at the second wavelength; wherein the light sources emit in a pulsed fashion and the sensor or processing means includes a phase-lock device to lock the frequency of the detected signal to pulsing frequency of the emitted signal.