公开(公告)号：US09857345B2

公开(公告)日：2018-01-02

申请号：US14554902

申请日：2014-11-26

Applicant: VALMET POWER OY

Inventor： Juha Toivonen ,  Antti Aalto ,  Matti Sarén ,  Juha Roppo

IPC: G01N25/00 ,  G01K11/00 ,  G01N33/00 ,  G01L11/02 ,  G01S17/88 ,  G01N21/51 ,  F28F27/00 ,  G01N21/39 ,  G01N21/49 ,  F23N5/02 ,  F23N5/08 ,  G01N21/17

CPC classification number: G01N33/0036 ,  F23N5/022 ,  F23N5/082 ,  F23N2025/04 ,  F23N2025/08 ,  F28F27/00 ,  G01K11/00 ,  G01L11/02 ,  G01N21/39 ,  G01N21/49 ,  G01N21/51 ,  G01N2021/1734 ,  G01N2201/06113 ,  G01N2201/0697 ,  G01S17/88

Abstract: A method for measuring, from a thermal device, temperature, molecular number density, and/or pressure of a gaseous compound as function of distance, the gaseous compound absorbing at least some light. The method comprises generating, for a first wavelength band and a second wavelength band, a pulse sequence comprising a light pulse or light pulses, guiding the pulse sequence into the thermal device, and measuring, as function of time, the intensity of the scattered light at the first wavelength band and at the second wavelength band. The method further comprises determining information indicative of the differential absorption between the two wavelengths bands using measured intensities and determining the temperature, the molecular number density, and/or the pressure of the gaseous compound using the information indicative of the differential absorption between the two wavelengths bands. A thermal system arranged to carry out the method.