PSD (Position Sensitive Detector) is an optoelectronic position sensor utilizing photodiode surface resistance. Unlike discrete element detectors
such as CCD, PSD provides continuous position data and features high position resolution and high-speed response.
Features
l
High position resolution
l
Wide spectral response range
l
High-speed response
l
Simultaneous measurements of position and intensity
l
Position is measured independent of light-spot size
l
High reliability
Applications
l
Optical position and angle sensing
l
Remote optical control systems
l
Automatic range finder systems
l
Displacement and vibration monitors
l
Laser beam alignment
l
Medical equipment
PSD
Two-dimensional PSD
Non-discrete position sensor utilizing photodiode surface resistance
S1880, S2044
■ General ratings / Absolute maximum ratings
Parameter Symbol S1880 S2044 Unit
Package - Ceramic Metal -
Active area size -12 × 12 4.7 × 4.7 mm
Reverse voltage VR Max. 20 V
Operating temperature Topr -10 to +60 °C
Storage temperature Tstg -20 to +80 °C
■ Electrical and optical characteristics (Typ. Ta=25 °C, unless otherwise noted)
S1880 S2044
Parameter Symbol Condition Min. Typ. Max. Min. Typ. Max. Unit
Spectral response range λ-320 to
1060 --
320 to
1060 -nm
Peak sensitivity wavelength λp-920 - - 920 -nm
Photo sensitivity S λ=λp-0.6--0.6-A/W
Interelectrode resistance *1Rie Vb=1 V 510 15 510 15 kΩ
ZONE A - ±80 ±150 - ±40 ±100
Position
detection error *2ZONE B E- ±150 ±250 - ±70 ±150 µm
Saturation current Ist VR=5 V
RL=1 kΩ-0.5 - - 0.5 -mA
Dark current IDVR=5 V - 1.0 500 - 0.5 5 nA
Temp. coefficient of IDTCID -1.15 - - 1.15 -times/°C
Rise time tr VR=5 V
RL=1 kΩ-1.5- -0.3- µs
Terminal capacitance Ct VR=5 V
f=10 kHz -300 - - 45 -pF
Position resolution *3--1.5--0.6-µm
*1: Measured between two output terminals opposite to each other, and the other terminals are open-circuited on measurement.
*2: The radius of Zones A and B depend on the product type. They are determined as follws:
Type No. ZONE A (mm) ZONE B (mm)
S1880 2.5 5
S2044 0.9 4 × 4 (quadrate)
KPSDC0063EA
ACTIVE AREA
ZONE B
ZONE A
1
Two-dimensional PSD
S1880, S2044
*3: Position resolution
This is the minimum detectable light spot displacement. The detection limit is indicated by distance on the photosensitive surface
.
The numerical value of the resolution of a position sensor using a PSD is proporional to both the length of the PSD and the noise
of the measuring system (resolution deteriorates) and inversely proportional to the photocurrent (incident evergy) of the PSD
(resolution improves).
· Light source: LED (900 nm) · Photocurrent: 1 µA
· Spot Light size: φ200 µm
· Circuit system input noise: 1 µV (1 kHz)
· Frequency range: 1 kHz
· Interelectrode resistance: Typical value (Refer to specification table.)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
200 400 600 800 12001000
PHOTO SENSITIVITY (A/W)
WAVELENGTH (nm)
QE=100 %
QE=50 %
■ Spectral response
KPSDB0013EB
■
Photo sensitivity temperature characteristic
KPSDB0015EB
■ Terminal capacitance vs. reverse voltage
KPSDB0074EB
+2.0
+1.5
+1.0
+0.5
0
-0.5300 400 500 600 700 800 900 1000 1100
WAVELENGTH (nm)
TEMPERATURE COEFFICIENT (%/˚C)
0.1 110
REVERSE VOLTAGE (V)
TERMINAL CAPACITANCE
1 pF 100
10 nF
1 nF
100 pF
10 pF
(Typ. Ta=25 °C, f=10 kHz)
S1880
S2044
2
Two-dimensional PSD
S1880, S2044
Rf
U
1
C
1
R
b
R
b
V
R
Rf
U
2
U
3
Rf
U
4
Rf
R
1
R
2
R
3
R
4
R
5
R
6
R
7
R
8
U
5
R
9
U
6
R
10
U
7
R
11
U
8
R
12
R
17
R
18
R
15
R
16
R
14
R
13
R
19
U
9
R
21
U
10
R
22
U
11
R
23
P
1
P
2
∆ X
Σ 1
∆ Y
DC RESTORATION
Σ 1
∆ X
Σ 1
∆ Y
U
12
X
0
Y
0
U
13
R
20
C
2
C
3
R
b
C
4
R
b
+
-
+
-
+
-
+
-
+
-
+
-+
-
+
-
+
-
+
-
+
-
R
1
- R
24
: same value
Rf: depends on input level
U
1
- U
4
: low drift head amplifier, TL071, etc.
U
12
, U
13
: analog divider, AD538 (Analog Devices), etc.
DC RESTORATION
S/H A
S/H B
P
2
P
1
∆ X, ∆ Y, Σ 1
P
1
P
2
0 V
*R
1
= R
2
= R
3
= R
4
R
1
R
2
R
4
R
3
■ Example of AC-operating circuit
+
V
R
Rf
U
1
Rf
Rf
Rf
U
2
U
3
U
4
R
9
R
2
R
3
R
4
R
1
R
5
R
6
R
7
R
8
U
8
U
7
U
6
U
5
R
10
R
11
R
12
R
13
R
14
R
15
R
16
R
17
R
18
R
23
R
22
R
21
R
20
U
11
U
10
U
9
R
19
Σ1
∆X
∆Y
∆X
Σ1
∆YY
0
X
0
U
14
U
13
Σ1
+
R
24
R
25
U
12
+
+
+
+
+
+
+
+
+
+
-
-
-
--
-
-
-
-
-
-
-
R
1
- R
25
: same value
Rf: depends on input level
U
1
- U
4
: low drift head amplifier, TL071, etc.
U
13
, U
14
: analog divider, AD538 (Analog Devices), etc.
■ Example of DC-operating circuit
KPSDC0026EB
3
■ Example of position detectability (Ta=25 °C, λ=900 nm, spot light size: φ200 µm)
S2044
KPSDC0019EA
LINE INTERVAL: 0.5 mm
S1880
KPSDC0020EA
LINE INTERVAL: 1 mm
KPSDC0029EB
HAMAMATSU PHOTONICS K.K., Solid State Division
1126-1 Ichino-cho, Higashi-ku Hamamatsu City, 435-8558 Japan, Telephone: (81) 53-434-3311, Fax: (81) 53-434-5184, www.hamamatsu.com
U.S.A.: Hamamatsu Corporation: 360 Foothill Road, P.O.Box 6910, Bridgewater, N.J. 08807-0910, U.S.A., Telephone: (1) 908-231-0960, Fax: (1) 908-231-1218
Germany: Hamamatsu Photonics Deutschland GmbH: Arzbergerstr. 10, D-82211 Herrsching am Ammersee, Germany, Telephone: (49) 08152-3750, Fax: (49) 08152-2658
France: Hamamatsu Photonics France S.A.R.L.: 19, Rue du Saule Trapu, Parc du Moulin de Massy, 91882 Massy Cedex, France, Telephone: 33-(1) 69 53 71 00, Fax: 33-(1) 69 53 71 10
United Kingdom: Hamamatsu Photonics UK Limited: 2 Howard Court, 10 Tewin Road, Welwyn Garden City, Hertfordshire AL7 1BW, United Kingdom, Telephone: (44) 1707-294888, Fax: (44) 1707-325777
North Europe: Hamamatsu Photonics Norden AB: Smidesvägen 12, SE-171 41 Solna, Sweden, Telephone: (46) 8-509-031-00, Fax: (46) 8-509-031-01
Italy: Hamamatsu Photonics Italia S.R.L.: Strada della Moia, 1/E, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741
Information furnished by HAMAMATSU is believed to be reliable. However, no responsibility is assumed for possible inaccuracies or omissions.
Specifications are subject to change without notice. No patent rights are granted to any of the circuits described herein. ©2007 Hamamatsu Photonics K.K.
Cat. No. KPSD1015E06
Oct. 2007 DN
Two-dimensional PSD
S1880, S2044
4
■ Dimensional outlines (unit: mm)
S2044
KPSDA0012EC
S1880
KPSDA0013EB
15.6 ± 0.25
5.7
5.7
14.0 ± 0.2
5.08
1.2 MAX.
2.54
5.08
5.08
5.08
4.2
5.1 ± 0.3
1.8
0.5 MAX.
ACTIVE AREA 4.7 × 4.7
0.75 LEAD
ANODE (X2)
ANODE (Y2)
CATHODE (CASE)
ANODE (X1)
ANODE (Y1)
X
Y
PHOTOSENSITIVE
SURFACE
(3 ×) R 0.2
9.0
ACTIVE AREA 12 × 12
0.7 t GLASS 28.0 ± 0.3
1.25
5.0 ± 0.2
9.0
0.75 LEAD
14
14
10.0
9.0
9.0
ANODE (Y2)
ANODE (X1)
ANODE (Y1)
ANODE (X2)
CATHODE (COMMON)
X
Y
PHOTOSENSITIVE
SURFACE
=
(IX2 + IY1) - (IX1 + IY2)
IX1 + IX2 + IY1 + IY2 2x
LX
=
(IX2 + IY2) - (IX1 + IY1)
IX1 + IX2 + IY1 + IY2 2y
LY
S1880: L
X
=14 mm
L
Y
=14 mm
S2044: L
X
=5.7 mm
L
Y
=5.7 mm
L
X
Y
2
X
2
X
1
L
Y
Y
1
x
y
ACTIVE AREA *
* Active area is specified at the inscribed square.
KPSDC0012EA
■ Active area chart
■ Position conversion formula