| 摘要 |
A flow meter includes a heating means ( 11 ) for heating a partial region of the outer wall surface of a pipe forming a flow path or for heating a particular region in the pipe; and temperature detecting means for measuring the temperatures of regions for radiating the temperature influence from the heated region to the outside as heat energy (infrared rays), the regions being on the upstream side and the downstream side of the pipe with respect to the heated region. The temperature detecting means consist of an upstream-side non-contact temperature detecting means ( 12 ) and a downstream-side non-contact temperature detecting means ( 13 ) arranged near the outer wall surface of the pipe in a state of being not in contact with the outer wall surface, and the non-contact temperature detecting means can measure the temperatures of the upstream-side heat energy radiating region and downstream-side heat energy radiating region in a state of being not in contact with the outer wall surface of the pipe. The flow rate of a fluid to be measured flowing in the flow path is measured from the temperature difference between the temperatures of the upstream-side heat energy radiating region and downstream-side heat energy radiating region measured by the non-contact temperature detecting means or from the output caused by the temperature difference.
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