Biomedical Engineering Reference
In-Depth Information
Frequency
plane
lens
(Fourier
transform)
Bragg
cell
Beam expander
(anamorphic)
Laser
Zero order
stop
Frequency 1
Frequency 2
Electronic
input
Detector
array
or film
FIGURE 3.3
Basic AO spectrum analyzer.
2,000
Aperture: 1-50 mm
Acoustic loss: 7 dB
Transducer loss: 10 dB
Diffraction
efficiency: 1%/Watt
for 1 mm transducer
GaP
1,000
TeO 2 (L)
500
LiNbO 3 (L)
PbMoO 4
BGO(L)
SF-8
Ω-Quartz
200
N = 10,000
BGO(S)
100
50
TeO 2 (S)
1 cm
N = 100
4 cm
20
N = 1,000
N = 10
10 0.1
1.0
0.2
0.5
2
5
10
20
50
100
Delay time -Aperture τ (µ s)
10
5
7
1.0
0.5
0.2
0.1
0.05
0.02
0.01
(a)
Resolution µ (MHz)
FIGURE 3.4
(a) Bandwidth-resolution contours.
 
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