Biomedical Engineering Reference
In-Depth Information
TABLE 16.1
Summarized Properties of BR-PVA Imaging Arrays
Characteristic and Notes
Gray-Scale Array
Color-Sensitive Array
Structure
BR-PVA film on gold
Concentration (mg/ml)
8.32
n.a.
Active area (mm
2
)
25
18-22
Thickness (
m)
144
101-107
Peak-to-peak photovoltage
6.10 V
84-186 mV
J, with electronics)
Response full width at 50% (ms)
(40
18
23
J, with electronics)
Response sensitivity to BR concentration
(40
Linear
n.a.
Response sensitivity to illuminated area
Linear
n.a.
Response sensitivity to radiant energy
Linear
Linear
Response resolution (bins)
53
36
J, with electronics)
Wavelength of peak response (nm)
(2-40
580
10
500-580
Spectral width of response peak (nm)
129
10
129-158
(50% responsivity)
Maximum pulsing frequency (Hz)
50
n.a.
(90% of the maximum response)
Notes
: n.a. = not available.
1
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
0.5
1
1
0.8
0.6
0.4
0.2
W
(
i
,2)
FIGURE 16.16
(See color insert following page 330)
Visualization of the color space for BR responses by using a 5
5 rectan-
gular SOM.
neuron gives the maximum response among all neurons. The response curves express the
strength of a neuron's response to stimuli at different wavelengths. The regions of maximum
response are indicated by filled areas under the curves. We may observe that the neurons
responding maximally to adjacent wavelength regions are also neighbors in the map.
