Biomedical Engineering Reference
In-Depth Information
+15V
.1µf
Rf
(1) Short lead S everywhere
(2) Bypass caps close to component lead
=
(3) Rf 200 kΩ
7
100 k
2
1
5
#1
#2
-
Photo
Out
6
p
+
3
8
4
.1µf
-15V
1k
100 k
Scope
monitor
Lo-pass
filter
LMN
.1
+V
.1
+V
1k
To piezoelectric
phase modulator
#1
2
2
8
-
LM
258 II
8
-
LM 258
1k
1
1
P 263
power supply
1k
3
#2
3
+
+
4
.1
.1
4
1µf
1k
-V
-V
1k
Differential amp.
×1 gain
×100 gain
FIGURE 4.29
Interferometer electronics schematic.
voltage to the piezoelectric optical phase modulator in the reference arm of
the interferometer. The high-voltage dc amplifier has controls for inserting
a continuously variable dc bias if desired. No attempt was made to limit the
signal bandwidth in this design, which would improve the SNR if needed.
4.19 DesignExample2:Fiber-Optic-
BasedLaserWarningReceiver
Military platforms requiring laser warning receiver (LWR) systems include
fixed and rotary wing aircraft, ships, and tanks [56]. Timely detection of
enemy laser activity, and characterization in terms of the associated weapon
system, offers the potential for implementing self-protective action (e.g., eva-
sive maneuver and/or the deployment of a smokescreen) or counterfire.
The lasers against which laser warning may be required are comparatively
low in energy and are generally used in association with weapon systems in
much the same way as, for example, fire control radars. Thus, detection of
illumination by a laser indicates the probable imminent arrival of a muni-
tion. Recent developments in LWRs are intended to integrate closely with
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