| 摘要 |
PROBLEM TO BE SOLVED: To directly and high accurately measure the flow velocity of gas with a simple construction using a molecule marker. SOLUTION: The current meter is composed of a molecule marker substance 2 moving with the flow of the gas, a light source 3 for optical excitation arranged on the upstream of the flow, and a photodetector 4 arranged on the downstream in the passage 1 of the gas. The molecule marker substance moving with the flow of the gas in the passage 1 is irradiated with the light source 3 for the optical excitation to induce the molecule marker to emit light. The moving time of the marker from the light source side to the photodetector 4 side, that is, the flow velocity of the gas is measured by detecting the emission of the molecule marker by the photodetector 4 on the down stream with the emission of light from the marker as a trigger.
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