Biomedical Engineering Reference
In-Depth Information
Accelerometer
Test
specimen
Shaker
Power
amplifier
3582A
A B
PRN
FIGURE 18.4
:
Test setup. The possible results in the evaluation would be (a) normal transfer
function response or (b) transfer function is contaminated by vibration from loose hardware during
testing of specimen
was 0
83), so the coherence function is an alternative method of measuring
the signal-to-noise ratio or an input-output system.
Lessard [3] used the coherence function to determine the cause-and-effect rela-
tionship between the output of the vestibular system and pseudorandom angular velocity
input. The subject was subjected to pseudorandom angular velocity the saccade of the
horizontal eye movement was converted to a signal. A full analysis of the output fre-
quencies was performed. The coherence function analysis was performed as the last step
in the analysis. This project was done with the objective of determining the nature and
causes of space sickness.
.
83
/
(1
−
0
.
18.5 PROBLEMS THAT LIMIT THE APPLICATION
OF COHERENCE
There are numerous problems that limit the application. The major problems will be
listed without discussion. Among these problems are
1.
inaccurate source measurements,
2.
source measurement interference,
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