WATER AMOUNT MEASUREMENT DEVICE AND WATER AMOUNT MONITORING SYSTEM

摘要

A water amount measurement device for measuring the level of a liquid flowing through a pipe line is provided with: a light-emitting element that irradiates a liquid surface of the liquid with light; a light-receiving element that receives the light reflected by the liquid surface and the light reflected by a liquid bottom at a bottom surface in the pipe line; a storage unit in which a distance V₀ from the light-emitting element to the liquid bottom in the pipe line is stored in advance; and a computation processing unit. A distance indicated by an average value of an upper envelope of distance data determined on the basis of an output signal from the light-receiving element is denoted by V₁, and a distance indicated by an average value of a lower envelope is denoted by V₂. The processing unit computes a level D₁ using V₁-V₀ if, during the level measurement, the result of comparison of the distance data and the distance V₀ indicates that the output signal from the light-receiving element includes a first signal component corresponding to a distance exceeding the distance V₀ and due to reflection by the liquid bottom in the pipe line. The processing unit computes a level D₂ using V₀-V₂ if the result of comparison indicates that the output signal includes a second signal component corresponding to a distance less than the distance V₀ and due to reflection by the liquid surface.