P S D
One-dimensional PSD
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,
,
,
S3979 S3931 S3932 S1352 S3270
3 to 37 mm resistance length PSD for precision distance measurement
Hamamatsu provides various types of one-dimensional PSD (Position Sensitive Detector) designed for precision distance measurement such as
displacement meters. S3979 has a 1 × 3 mm active area sealed in a TO-5 package. S3931 and S3932 have an active area of 1 × 6 mm and 1 ×
12 mm respectively, and are mounted on a compact ceramic package with a transparent resin window. Variant types (S3931-01, S3932-01) with
a visible-cut resin window are also available. S1352 and S3270 offer an active area longer than 30 mm, allowing position detection at a long
distance.
S3270 has a visible-cut resin window, and S3270-01 with a transparent resin window is also available.
Features
Applications
Superior position detection ability
High reliability
S3931, S3932: Easy to use 4-pin small ceramic package
Long and narrow active area
S1352: 2.5 × 34 mm
Displacement sensing
Distance measurement
Proximity switching
S3270: 1 × 37 mm
ꢀ General ratings / Absolute maximum ratings
Absolute maximum ratings
Active area
Window
Operating temperature
Reverse voltage
Storage temperature
Type No.
Package
TO-5
size
material *1
V
Max.
Topr
(°C)
Tstg
(°C)
R
(mm)
1 × 3
1 × 6
1 × 12
2.5 × 34
1 × 37
(V)
K
R
S3979
S3931
-10 to +60
-10 to +75
S3932
R
K
R (B)
20
-20 to +80
Ceramic
S1352 *2
S3270 *2
ꢀ Electrical and optical characteristics (Typ. Ta=25 °C, unless otherwise noted)
Position
Temp.
coefficient
of
Terminal
capacitance Position
Spectral
response sensitivity sensitivity
range
λ
Peak
Photo
Saturation
Rise time
Interelectrode
resistance
Rie
Dark
current
detection error *3
4
photocurrent
*
tr
resolution
E
Ct
wavelength
λp
R
R
V =5 V
R =1 k
L
Ω
S
λ=λp
V =5 V
D
I
5
R
V =5 V
D
R
*
I
V =5 V
Type No.
R
L
=1 k
Ω
R
Vb=0.1 V
V =5 V
f=10 kHz
light spot 200
m
µ
φ
CID
T
Typ. Max.
(nA) (nA) (times/° C)
Min. Typ. Max.
(kΩ) (kΩ) (kΩ)
100 140 180
Typ. Max.
(µm) (µm)
(nm)
(nm) (A/W)
(µA)
40
(µs)
2.5
1.5
3.0
0.7
1.0
(pF)
20
40
80
150
100
(µm)
0.1
0.2
0.3
2.1
2.8
S3979
15
30
60
0.1
5
S3931
S3932
S1352
S3270
0.55
920
120
240
500
400
0.15 10
0.2 20 1.15
320 to 1100
30
10
50
80
100
60
0.6
20
15
30
20
125
100
250
300
2
150
700 to 1100
960
0.55 10
0.5 20
*1: K: borosilicate glass, R: clear resin coating, R (B): visible-cut resin coating.
*2: Works with microscopic spot light detection.
*3: A range of 75 % of that from the center of the photosensitive surface to the edge.
*4: The upper limit of linearity of photocurrent in response to the quantity of light is defined as the point where the linearity
deviates by 10 %.
*5: Position resolution
This is the minimum detectable light spot displacement. The detection limit is indicated by the distance on the photosensitive
surface. The numerical value of the resolution of a position sensor using a PSD is proportional to both the length of the PSD
and the noise of the measuring system (resolution deteriorates) and inversely proportional to the photocurrent (incident
energy) of the PSD (resolution improves).
Light source: LED (900 nm)
Spot light size: φ 200 µm
Frequency range: 1 kHz
Photocurrent: 1 µA
Circuit system input noise: 1 µV (1 kHz)
Interelectrode resistance: Typical value (refer to the specification table)
1