| 摘要 |
The present invention addresses the problem of suppressing the heat loss that occurs when the dryness of wet steam is measured using light and measuring dryness with high accuracy. The present invention is provided with a light introduction unit (11) for causing light to pass through a light entry opening (A1) provided in piping (30) through which wet steam (SA) under measurement flows; a light reception unit (12) for receiving, from a light exit opening (A2) provided in the piping (30), light that has passed through or been reflected by the wet steam (SA) and outputting a detection signal (Sd); a dryness determining unit (13) for referring to the detection signal (Sd) and determining the dryness of the wet steam (SA); and heat loss compensation devices (20, 21, 22) for compensating for the heat loss of the light entry opening (A1), the light exit opening (A2), or both. |
