參數(shù)資料
型號： S8361
廠商： Electronic Theatre Controls, Inc.
英文描述： POSITION SENSITIVE DETECTOR
中文描述： 位置靈敏探測器
文件頁數(shù)： 9/16頁
文件大小： 1289K
代理商： S8361
6
l
Position conversion formula (See Figure 3-2.)
The tetra-lateral type has four electrodes on the upper
surface, formed along each of the four edges. Photocur-
rent is divided into 4 parts through the same resistive
layer and extracted as position signals from the four
electrodes. Compared to the duo-lateral type, interaction
between the electrodes tends to occur near the corners
of the active area, making position distortion larger. But
the tetra-lateral type features an easy-to-apply reverse
bias voltage, small dark current and high-speed re-
sponse. The light input position for the tetra-lateral type
shown in Figure 3-4 is given by conversion formulas (3-
3) and (3-4), which are the same as for the duo-lateral
type.
3-2 Tetra-lateral type PSD
Figure 3-1 Structure chart, equivalent circuit (duo-lateral type PSD)
Figure 3-2 Active area chart (duo-lateral type PSD)
KPSDC0007EA
KPSDC0011EA
This is a variant of the tetra-lateral type PSD with an im-
proved active area and reduced interaction between elec-
trodes. In addition to the advantages of small dark current,
high-speed response and easy application of reverse bias
that the tetra-lateral type offers, the circumference distor-
tion has been greatly reduced. The light input position of
the pin-cushion type shown in Figure 3-6 is calculated from
conversion formulas (3-5) and (3-6), which are different
from those for the duo-lateral and tetra-lateral types.
l
Position conversion formula (See Figure 3-4.)
l
Position conversion formula (See Figure 3-6.)
3-3 Pin-cushion type (improved tetra-lateral type) PSD
Figure 3-3 Structure chart, equivalent circuit (tetra-lateral type PSD)
KPSDC0008EA
Figure 3-4 Active area chart (tetra-lateral type PSD)
KPSDC0011EA
= ........ (3-1)
L
X
I
X2
-
I
X1
I
X1
+
I
X2
= ........ (3-2)
L
Y
I
Y2
-
I
Y1
I
Y1
+
I
Y2
Figure 3-5 Structure chart, equivalent circuit (pin-cushion type PSD)
Figure 3-6 Active area chart (pin-cushion type PSD)
KPSDC0012EA
KPSDC0009EA
= ........ (3-3)
L
X
I
X2
-
I
X1
I
X1
+
I
X2
= ........ (3-4)
L
Y
I
Y2
-
I
Y1
I
Y1
+
I
Y2
= ........ (3-5)
L
X
L
Y
(I
X2
+
I
Y1
)
-
(I
X1
+
I
Y2
)
I
X1
+
I
X2
+
I
Y1
+
I
Y2
(I
X2
+
I
Y2
)
-
(I
X1
+
I
Y1
)
I
X1
+
I
X2
+
I
Y1
+
I
Y2
= ........ (3-6)
Characteristic and use
L
X
Y
2
X
2
X
1
L
Y
Y
1
x
y
ACTIVE AREA
L
X
Y
2
X
2
X
1
L
Y
Y
1
x
y
ACTIVE AREA
L
X
Y
2
X
2
X
1
L
Y
Y
1
x
y
ACTIVE AREA *
* Active area is specified at the inscribed square.
ANODE (
X
1
)
ANODE (
X
2
)
CATHODE (
Y
2
)
CATHODE (
Y
1
)
Rp
P
D Cj Rsh
P
D
Cj
Rsh
Rp
Rp
: CURRENT GENERATOR
: IDEAL DIODE
: JUNCTION CAPACITANCE
: SHUNT RESISTANCE
: POSITIONING RESISTANCE
ANODE (X
1
)
ANODE (Y
2
)
ANODE (X
2
)
ANODE (Y
1
)
CATHODE
P
D
Cj
Rsh
P
D
Cj
Rsh
Rp
Rp
: CURRENT GENERATOR
: IDEAL DIODE
: JUNCTION CAPACITANCE
: SHUNT RESISTANCE
: POSITIONING RESISTANCE
Rp
P
DCj
Rsh
P
D
Cj
Rsh
Rp
ANODE (
X
2
)
ANODE (
Y
1
)
ANODE (
X
1
)
ANODE (
Y
2
)
CATHODE
: CURRENT GENERATOR
: IDEAL DIODE
: JUNCTION CAPACITANCE
: SHUNT RESISTANCE
: POSITIONING RESISTANCE
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