<s>
The	O
three-axis	B-Algorithm
acceleration	I-Algorithm
switch	I-Algorithm
is	O
a	O
micromachined	O
microelectromechanical	B-Architecture
systems	I-Architecture
(	O
MEMS	B-Architecture
)	O
sensor	O
that	O
detects	O
whether	O
an	O
acceleration	O
event	O
has	O
exceeded	O
a	O
predefined	O
threshold	O
.	O
</s>
<s>
It	O
was	O
developed	O
by	O
the	O
Army	O
Research	O
Laboratory	O
for	O
the	O
purposes	O
of	O
traumatic	O
brain	O
injury	O
(	O
TBI	O
)	O
research	O
and	O
was	O
first	O
introduced	O
in	O
2012	O
at	O
the	O
25th	O
International	O
Conference	O
on	O
Micro	B-Architecture
Electro	I-Architecture
Mechanical	I-Architecture
Systems	I-Architecture
(	O
MEMS	B-Architecture
)	O
.	O
</s>
<s>
The	O
three-axis	B-Algorithm
acceleration	I-Algorithm
switch	I-Algorithm
was	O
designed	O
to	O
obtain	O
acceleration	O
data	O
more	O
effectively	O
than	O
a	O
conventional	O
accelerometer	O
in	O
order	O
to	O
more	O
accurately	O
characterize	O
the	O
forces	O
and	O
shocks	O
responsible	O
for	O
TBI	O
.	O
</s>
<s>
While	O
miniature	O
accelerometers	O
require	O
a	O
constant	O
power	O
draw	O
,	O
the	O
three-axis	B-Algorithm
acceleration	I-Algorithm
switch	I-Algorithm
only	O
draws	O
current	O
when	O
it	O
senses	O
an	O
acceleration	O
event	O
,	O
using	O
up	O
less	O
energy	O
and	O
allowing	O
the	O
use	O
of	O
smaller	O
batteries	O
.	O
</s>
<s>
The	O
three-axis	B-Algorithm
acceleration	I-Algorithm
switch	I-Algorithm
has	O
shown	O
to	O
exhibit	O
an	O
expected	O
battery	O
lifetime	O
that	O
is	O
about	O
100	O
times	O
better	O
than	O
that	O
of	O
a	O
digital	O
accelerometer	O
.	O
</s>
<s>
One	O
potential	O
application	O
of	O
the	O
three-axis	B-Algorithm
acceleration	I-Algorithm
switch	I-Algorithm
is	O
in	O
studying	O
the	O
head	O
impacts	O
of	O
players	O
in	O
high-risk	O
contact	O
sports	O
.	O
</s>
