Document Type and Number:
Japanese Patent JPWO2021085525
Kind Code:
A1
Abstract:
A measurement device includes a light emitter, a light receiver, an extractor, and a processor. The light emitter illuminates an illumination target having an internal space through which a fluid flows. The light receiver receives coherent light including light scattered by the illumination target and outputs a signal corresponding to intensity of the coherent light. The extractor extracts a direct-current component from the signal output from the light receiver at a temporal change in strength of the signal. The processor calculates a calculation value for a flow state of the fluid by performing a process on the signal output from the light receiver. The process includes correction using a value of signal strength of the direct-current component and calculation of a frequency spectrum for the signal at the temporal change in the signal strength.
Application Number:
JP2021553680A
Publication Date:
May 06, 2021
Filing Date:
October 29, 2020
Export Citation:
Domestic Patent References:
| JP2008278993A | 2008-11-20 | |||
| JP2019076538A | 2019-05-23 | |||
| JP2017187359A | 2017-10-12 |
Foreign References:
| WO2019146762A1 | 2019-08-01 | |||
| WO2013153664A1 | 2013-10-17 |