| 摘要 |
<p>In order that a flow tube (3) of a Coriolis flowmeter (1) may be oscillated in the tertiary mode using one driver (4), the driver (4) is arranged at the antinode (H2) in the center of tertiary mode oscillation, and oscillation sensors (5, 5) are arranged at two antinodes (H1, H3) other than the antinode (H2) in the center of tertiary mode oscillation. Furthermore, the displacement polarity of the driver (4) is opposite to those of the oscillation sensors (5, 5), so that the oscillation phases of the flow tube (3) are in a relation of mutually opposite phases. Furthermore, in the positive feedback loop of the exciting circuit section (9) for exciting tertiary mode oscillation of the flow tube (3) and the oscillation sensors (5, 5), the exciting circuit section (9) is structured so that the relation between the displacement polarities where the oscillation phases of the flow tube (3) are opposite to one another is changed to the relation where the oscillation phases of the flow tube (3) are in phase.</p> |
