參數(shù)資料
型號(hào)： S3979
廠商： Electronic Theatre Controls, Inc.
英文描述： POSITION SENSITIVE DETECTOR
中文描述： 位置靈敏探測(cè)器
文件頁(yè)數(shù)： 10/16頁(yè)
文件大小： 1289K
代理商： S3979
7
Figure 4-2 shows the photocurrent output example from
electrodes of a one-dimensional PSD with a resistance
length of 3 mm (S4583-04, etc.), measured when a light
beam is scanned over the active surface. The position de-
tection error estimated from the obtained data is also
shown in the lower graph.
The light beam position can be detected over the entire ac-
tive area of PSD. However, if part of the light beam strikes
outside the active area, a positional shift in the center-of-
gravity occurs between the entire light beam and the light
spot falling within the active area, making the position
measurement unreliable. It is therefore necessary to select
a PSD whose active area matches the incident spot light.
Figure 4-3 Center-of-gravity of incident spot light
ACTIVE
Figure 4-1 Cross section of PSD
KPSDB0005EA
Figure 4-2 Photocurrent output example of one-
dimensional PSD (S4583-04, etc.)
Position detection error example of one-
dimensional PSD (S4583-04, etc)
Specific area for position detection error
KPSDC0071EA
Position detection capability is the most important charac-
teristic of a PSD. The position of a spot light incident on the
PSD surface can be measured by making calculations
based on the photocurrent extracted from each electrode.
The position obtained here with the PSD is the center-of-
gravity of the spot light, and is independent of the spot light
size, shape and intensity.
However, the calculated position usually varies slightly in
each PSD from the actual position of the incident light. This
difference is referred to as the
“
position detection error
”
and
is explained below.
If a light beam strikes the electrical center of a PSD, the
signal currents extracted from the output electrodes are
equal. When this electrical center is viewed as the origin,
the position detection error is defined as the difference be-
tween the position at which the light is actually incident on
the PSD and the position calculated from the PSD outputs.
Characteristic and use
4. Position detection error
KPSDC0073EA
In Figure 4-1 above, if the actual position of incident light
is Xi and the position calculated by the photocurrents
(I
X1
and I
X2)
from electrodes X
1
and X
2
is Xm, then the
difference in distance between Xi and Xm is defined as
the position detection error as calculated below.
Position detection error E = Xi - Xm [μm] ........ (4-1)
Xi : Actual position of incident light (μm)
Xm: Calculated position of incident light (μm)
The position detection error is measured under the follow-
ing conditions.
·
Light source
:
λ
=890 nm
·
Spot light size
:
φ
200 μm
·
Total photocurrent: 10 μA
·
Reverse voltage
: Specified value (listed in data sheets)
Xm = I
I
X1
+
I
X2
X2
-
I
X1
L
X
2
........ (4-2)
POSITION ON PSD (mm)
+1.5
0
-1.5
0
0.5
1.0
R
I
X2
I
X1
+50
0
-50
-1.5
-1.0
-0.5
+0.5
+1.0
0
+1.5
POSITION ON PSD (mm)
P
OUTPUT
1
OUTPUT
2
CENTER-OF-GRAVITY
CENTER-OF-GRAVITY
SPOT
LIGHT
COMMON ELECTRODE
RESISTANCE LENGTH L
X
SPOT
LIGHT
Xm
Xi
X
1
X
2
CALCULATED POSITION
Xm
ACTUAL POSITION
Xi
ELECTRICAL
CENTER B
N LAYER
I LAYER
P-TYPE
RESISTIVE LAYER
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