| 摘要 |
PROBLEM TO BE SOLVED: To provide piping in which the intensity of light passing through steam can be reliably measured even with any piping diameter.SOLUTION: Piping according to an aspect into which steam flows comprises a light incident part which makes light emitted by a light emission part incident on the steam from an incident end face and a light exit part which makes light having penetrated through or reflected on the steam exit toward a light reception part from an exit end face. A light path length from the incident end face to the exit end face is adjusted so that the intensity of light attenuated by passing through the steam becomes the lowest light intensity or more which can be measured by the light reception part.SELECTED DRAWING: Figure 1 |
