| 摘要 |
The present invention addresses the problem of measuring appropriate dryness even when a pipe is inclined. A dryness measurement device is characterized by being provided with: a light incidence unit (11) which causes light to be incident along a light path (L) preset in a pipe (20) through which wet steam to be measured flows; a light reception unit (12) which detects the intensity of light transmitted through or reflected by the wet steam; and a dryness specification unit (100) which specifies the dryness of the detected wet steam on the basis of the detected light intensity, and characterized in that the light path (L) is set so as to pass a liquid-phase portion (w) flowing along the inner wall of the pipe (20) of the wet steam, the dryness specification unit (100) calculates the dryness of the wet steam on the basis of the detected light intensity (I), the areas (Sa/Sw) of a gas-phase portion and the liquid-phase portion of the wet steam which correspond to the light intensity (I), a speed difference (&Dgr;v) between the gas-phase portion and the liquid-phase portion of the wet steam, and a density difference (&Dgr;&rgr;) between the gas-phase portion and the liquid-phase portion of the wet steam. |
