| 摘要 |
<p>A dust monitoring device comprising a stand (12), two open-topped buckets (16.1 and 16.2), and a cover member (18). The buckets are supported in a cradle on the stand at a predetermined height, and are placed upwind-downwind in relation to each other. The cover member includes a cover body (52) which is mounted to the stand above the buckets so as to be freely rotatable relative to the buckets. The cover body includes an aperture (60) and an upright fin (56), which is acted upon by a prevailing wind, causing the cover body to assume an orientation wherein the upwind bucket is uncovered while the downwind bucket is covered. Thus precipitation of airborne dust from two opposing prevailing wind directions can be collected in the buckets and measured.</p> |
