Trillium Compact User Guide
16889R5
2014-03-04
27
Chapter 4
Input and Output Signals
4.1 UVW and XYZ Output Signals
The Trillium Compact can be configured to output either XYZ or UVW signals. The “natural”
output is UVW where the outputs represent the actual motion of the three sensor
component masses. The “conventional” seismometer output is XYZ where the outputs
represent horizontal and vertical motion.
To understand the difference between the UVW and XYZ outputs, see
. By design,
the Trillium Compact axes are identical and sense motion in orthogonal directions. The U
axis is aligned with the X axis when projected into the horizontal plane.
Figure 4-1
Trillium Compact axis orientation
This arrangement results in the following transformation equations:
(EQ 1)
(EQ 2)
Z
X
Y
U
V
W
u
v
w
1
6
-------
2
0
2
1
–
3
2
1
–
3
–
2
x
y
z
⋅
⋅
=
x
y
z
1
6
-------
2
1
–
1
–
0
3
3
–
2 2
2
u
v
w
⋅
⋅
=
