S3931_15 Datasheet, PDF (1/4 Pages) Hamamatsu Corporation – 6 to 37 mm resistance length PSD for precision distance measurement

PSD
One-dimensional PSD
S3931, S3932, S3270
6 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.
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.
S3270 offers 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
l Superior position detection ability
l High reliability
l S3931, S3932: Easy to use 4-pin small ceramic package
l Long and narrow active area
S3270: 1 × 37 mm
Applications
l Displacement sensing
l Distance measurement
l Proximity switching
s General ratings / Absolute maximum ratings
Type No.
S3931
S3932
S3270 *²
Package
Ceramic
Window
material *¹
R
R
R (B)
Active area
size
(mm)
1×6
1 × 12
1 × 37
Absolute maximum ratings
Reverse voltage O peratin g tem perature Storage temperature
VR Max.
Topr
Tstg
(V)
(°C)
(°C)
20
-10 to +60
-20 to +80
-10 to +75
s Electrical and optical characteristics (Typ. Ta=25 °C, unless otherwise noted)
Type No.
Spectral Peak Photo
response sensitivity sensitivity
range wavelength S
λ
λp λ=λp
Interelectrode
resistance
Rie
Vb=0.1 V
Position
detection erro
E
VR=5 V
light spot φ200
r *³
µm
Saturation
photocurrent *⁴
VR=5 V
RL=1 kΩ
Dark
current
ID
VR=5 V
Temp.
coefficient
of
ID
TCID
Rise time
tr
VR=5 V
RL=1 kΩ
T e rm in a l
capacitance
Ct
VR=5 V
f=10 kHz
Position
resolution
*⁵
Min. Typ. Max. Typ. Max.
Typ. Max.
(nm) (nm) (A/W) (kΩ) (kΩ) (kΩ) (µm) (µm) (µA) (nA) (nA) (tim es/°C ) (µs) (pF) (µm)
S3931
S3932
320 to 1100 920
0.55 30
50
80
±30 ±120
±60 ±240
100
0.15 10
0.2 20
1.15
1.5
3.0
40
80
0.2
0.3
S3270
700 to 1100 960 0.55 10 15 20 ±100 ±400 300 0.5 20
1.0 100 2.8
*1: 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)
Photocurrent: 1 µA
Spot light size: φ 200 µm
Circuit system input noise: 1 µV (1 kHz)
Frequency range: 1 kHz
Interelectrode resistance: Typical value (refer to the specification table)
1