Digital Signal Processing Reference
In-Depth Information
Fig. 2.
Reading mouse position to obtain the pixel coordinates of the sphere
t
t
Define
y
,
y
as pixel coordinates corresponding to different time
and
in
2
l
Flash scene, the falling distance
in object coordinate can be expressed as
l pyy
=
(
−
)
(6)
2
1
Therefore, the viscosity coefficient
η
of the castor oil can be determined by
(
ρρ
−
′
)
gd t
2
(
−
t
)
η
=
2
1
(7)
d
18
py y
(
−+
)(1
2.1
)
2
1
D
4
Experimental Procedure
The experimental devices include a vessel filled with castor oil, a web camera and a
personal computer. The vessel is
6.72
cm
in diameter and
high. The sphere
50
cm
used in the experiment have two sizes,
and
in diameter. Room
1.59
mm
2.00
mm
temperature is .The density of sphere and castor oil are
and respectively.
The web camera is ET380 with the resolution of which is produced by
lenovo. During the experiment, it should be placed in the plane that is parallel or close
to the vessel filled with the castor oil, the distance is about 1 meter from the vessel
meanwhile, the focal length is adjusted so that the falling ball can be clearly seen. The
diagrammatic layout is presented in Figure 3.
17.5
c
ρ =×
7.90
10
3
Kg m
/
3
ρ′ =
0.966
×
10
3
Kg m
/
3
800
×
600
