| 摘要 |
A handheld airflow measurement device is provided that employs pitot- static principles instead of an anemometer. A pitot- static device has the advantage that it needs no moving parts and has little or no inertia. In a first aspect, therefore, a pitot-static device comprises a first plurality of hollow spokes and a second plurality of hollow spokes, the spokes of the first plurality being connected so as to allow fluid communication between their hollow interiors and each having at least one aperture facing in a first axial direction that is transverse to the radial direction, the spokes of the second plurality being connected so as to allow fluid communication between their hollow interiors and each having at least one aperture facing in a second axial direction that is opposed to the first axial direction. Such a device can be made symmetrical, meaning that it can be assembled from two identical half-mouldings. The second plurality of spokes can each have an aperture at the end thereof - additional to or as a replacement for the reverse-directed apertures. The device can comprise a handle for manual support, to allow it to be carried and located as required. The device can have a central hub from which the pluralities of spokes extend radicaly. The device can further comprise a ring around the central hub, the spokes extending from the hub to an inner face of the ring. |
