 |
| Titel |
A video precipitation sensor for imaging and velocimetry of hydrometeors |
| VerfasserIn |
X. C. Liu, T. C. Gao, L. Liu |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1867-1381
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 7 ; Nr. 7, no. 7 (2014-07-09), S.2037-2046 |
| Datensatznummer |
250115842
|
| Publikation (Nr.) |
 copernicus.org/amt-7-2037-2014.pdf |
|
|
|
|
|
| Zusammenfassung |
| A new method to determine the shape and fall velocity of hydrometeors by
using a single CCD camera is proposed in this paper, and a prototype of a
video precipitation sensor (VPS) is developed. The instrument consists of an
optical unit (collimated light source with multi-mode fibre cluster), an
imaging unit (planar array CCD sensor), an acquisition and control unit, and
a data processing unit. The cylindrical space between the optical unit and
imaging unit is sampling volume (300 mm × 40 mm × 30 mm).
As the precipitation particles fall through the sampling volume, the CCD
camera exposes twice in a single frame, which allows the double exposure
of particles images to be obtained. The size and shape can be obtained by
the images of particles; the fall velocity can be calculated by particle
displacement in the double-exposure image and interval time; the drop size
distribution and velocity distribution, precipitation intensity, and
accumulated precipitation amount can be calculated by time integration. The
innovation of VPS is that the shape, size, and velocity of precipitation
particles can be measured by only one planar array CCD sensor, which can
address the disadvantages of a linear scan CCD disdrometer and an impact
disdrometer. Field measurements of rainfall demonstrate the VPS's capability
to measure micro-physical properties of single particles and integral
parameters of precipitation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|