| 摘要 |
PURPOSE:To improve a detecting sensitivity, by a method wherein a vibrating plate, which is displaced due to a change in pressure produced at opposite side of a K arm an's vortex street generating substance, consisting of a magnetic substance, and one end is magnetically adsorbed and supported. CONSTITUTION:An approximately triangular room 10 is formed at a center of a housing comprising a non-magnetic substance, pressure introducing holes 8a and 8b are formed in wall surfaces 11a and 11b, and are connected to parts in the proximity of the opposite sides of the K arm an's vortex street generating substance through holes 9a and 9b. A vibrating plate 12, made of a magnetic substance such as iron, nickel, is inserted into the room 10 so that it is positioned in a play at the periphery, one end 13 is adsorbed and held by a permanent magnetic 15 through a bearing 14, and the vibrating plate 12 is rockably positioned with the one end 13 acting as a fulcrum. The end of the room 10 positioned facing and opposite to the bearing 14 keeps airtightness through the air of a shield 22, and a hole is formed in a plate 23 to feed the light through optical fibers 17 and 18 to measure the vibration of the vibrating of the vibrating plate 12. This reduces the spring constant of the vibrating plate and improves a detecting sensitivity. |
