| 摘要 |
PROBLEM TO BE SOLVED: To provide a duct inside airflow meter and a measurement method capable of accurately measuring an airflow inside a duct even when elongation of a sensor member occurs.SOLUTION: A duct inside airflow meter comprises: a linear or planar sensor member 20 disposed across the inside of a duct 1; a take-up motor 22 that adds a tension to the sensor member 20; an encoder 30 that detects a rotation position of the take-up motor 22; and a calculation section 32 that detects the tension added to the sensor member 20. In a windless state, a predetermined tension is added to the sensor member 20 by the take-up motor 22, and the rotation position of the take-up motor at this time is detected by the encoder 30. The rotation position is set as a reference position, and in an air blowing state, the take-up motor 22 is controlled so that the rotation position of the take-up motor detected by the encoder 30 is held at the reference position. The tension added to the sensor member 20 at this time is detected, and on the basis of the detected tension, an airflow inside of the duct 1 is measured. |
