<s>
A	O
photoelectric	B-Algorithm
sensor	I-Algorithm
is	O
a	O
device	O
used	O
to	O
determine	O
the	O
distance	O
,	O
absence	O
,	O
or	O
presence	O
of	O
an	O
object	O
by	O
using	O
a	O
light	O
transmitter	O
,	O
often	O
infrared	O
,	O
and	O
a	O
photoelectric	O
receiver	O
.	O
</s>
<s>
A	O
self-contained	O
photoelectric	B-Algorithm
sensor	I-Algorithm
contains	O
the	O
optics	B-Algorithm
,	O
along	O
with	O
the	O
electronics	O
.	O
</s>
<s>
The	O
sensor	O
performs	O
its	O
own	O
modulation	B-Application
,	O
demodulation	O
,	O
amplification	O
,	O
and	O
output	O
switching	O
.	O
</s>
<s>
Because	O
of	O
technological	O
progress	O
,	O
self-contained	O
photoelectric	B-Algorithm
sensors	I-Algorithm
have	O
become	O
increasingly	O
smaller	O
.	O
</s>
<s>
Remote	O
photoelectric	B-Algorithm
sensors	I-Algorithm
used	O
for	O
remote	B-Application
sensing	I-Application
contain	O
only	O
the	O
optical	O
components	O
of	O
a	O
sensor	O
.	O
</s>
<s>
When	O
space	O
is	O
restricted	O
or	O
the	O
environment	O
too	O
hostile	O
even	O
for	O
remote	B-Application
sensors	I-Application
,	O
fibre	B-Architecture
optics	I-Architecture
may	O
be	O
used	O
.	O
</s>
<s>
Fibre	B-Architecture
optics	I-Architecture
are	O
passive	O
mechanical	O
sensing	O
components	O
.	O
</s>
<s>
The	O
detecting	O
range	O
of	O
a	O
photoelectric	B-Algorithm
sensor	I-Algorithm
is	O
its	O
"	O
field	O
of	O
view	O
"	O
,	O
or	O
the	O
maximum	O
distance	O
from	O
which	O
the	O
sensor	O
can	O
retrieve	O
information	O
,	O
minus	O
the	O
minimum	O
distance	O
.	O
</s>
