Mesuring size and velocity distribution of precipitaiton
Parsivel
-
laser-based optical
disdrometer - measures precipitaiton liquid precipitaiton particles
from 0.2 - 5 mm and solid particles from 0.2 to 25 mm with fall
velocities ranging from 0.2 to 20 ms-1.
 |
Functional
Principle The theory behind Parsivel is a laser sensor that produces a horizontal strip if light. The emitter and the receiver are integrated into a single protective house. Particle size: If there are no particles in the laser beam, the maximum voltage is output at the receiver. Precipitaiton particles passing through the laser beam block off a prortion of the beam corresponding to their diameter, thus reducing the output voltage; this determines the particles size. Particle speed: To determine the particle speed, the duration of the signal is measured. A signal begins as soon as a precipitaiton particle enters the light strip and ends when ot has completely left the light strip. |
First
measurments from the roof of
the Duane Physics building at the campus of the University of Colorado
at Boulder:
The instruments will be part of the ROTATE 2008 experiment conducted in May 2008. To check out our current location click here.
| N(d): |
7
April 2008 |
9
April 2008 |
10
April 2008 |
| N(v): |
7
April 2008 |
9
April 2008 |
10
April 2008 |
The instruments will be part of the ROTATE 2008 experiment conducted in May 2008. To check out our current location click here.