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 S327001 with a transparent resin window is also available. Features Applications l Superior position detection ability l Displacement sensing l High reliability l Distance measurement l S3931, S3932: Easy to use 4-pin small ceramic package l Proximity switching l Long and narrow active area S3270: 1 × 37 mm ■ General ratings / Absolute maximum ratings Type No. S3931 S3932 S3270 *2 Package Window material *1 Ceramic 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 ■ Electrical and optical characteristics (Typ. Ta=25 °C, unless otherwise noted) P ositio n Tem p. Term inal Saturation Dark R ise tim e Interelectrode detection error * 3 coefficient capacitance Position 4 photocurrent * current tr resistance of E Ct resolution VR=5 V Rie VR=5 V ID Type No. ID *5 VR=5 V VR=5 V R L =1 kΩ VR=5 V R L =1 kΩ Vb=0.1 V light spot φ200 µm f=10 kH z TCID Typ. M ax. Min. Typ. Max. Typ. Max. (µA) (nA) (nA) (tim es/°C ) (µs) (pF) (nm) (nm) (A/W) (kΩ) (kΩ) (kΩ) (µm) (µm) (µm) S3931 ±30 ±120 0.15 10 1.5 40 0.2 320 to 1100 920 0.55 30 50 80 100 S3932 ±60 ±240 0.2 20 1.15 3.0 80 0.3 700 to 1100 960 S3270 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) S p ectral Peak Photo response sensitivity sensitivity range wavelength S λ λp λ=λp 1 One-dimensional PSD ■ Spectral response ■ Photo sensitivity temperature characteristics (Typ. Ta=25 ˚C) 0.8 TEMPERATURE COEFFICIENT (%/˚C) 0.6 S3931 S3932 0.4 0.2 S3270 QE=50 % 0 400 600 800 (Typ.) +2.0 QE=100 % PHOTO SENSITIVITY (A/W) S3931, S3932, S3270 +1.5 +1.0 S3270 0 -0.5 300 1000 S3931, S3932 +0.5 WAVELENGTH (nm) 400 500 600 700 800 900 1000 1100 WAVELENGTH (nm) KPSDB0070EC KPSDB0069EC ■ Dark current vs. reverse voltage ■ Terminal capacitance vs. reverse voltage (Typ. Ta=25 ˚C) S3270 DARK CURRENT 1 nA 100 pA S3932 S3931 10 pA 1 pA 0.1 1 10 100 REVERSE VOLTAGE (V) 1 nF S3270 S3932 100 pF S3931 10 pF 1 pF 0.1 1 10 100 REVERSE VOLTAGE (V) KPSDB0071EC 2 (Typ. Ta=25 ˚C, f=10 kHz) 10 nF TERMINAL CAPACITANCE 10 nA KPSDB0072EC One-dimensional PSD S3931, S3932, S3270 ■ Example of position detectability (Ta=25 °C, λ=900 nm, spot light size: φ0.2 mm) S3931 S3932 +150 POSITION DETECTION ERROR (mm) POSITION DETECTION ERROR (mm) +150 +100 +50 0 -50 -100 +100 +50 0 -50 -100 -150 -150 -3 -2 -1 0 +1 +2 POSITION ON PSD (mm) +3 KPSDB0011EB -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 POSITION ON PSD (mm) KPSDB0012EB POSITION DETECTION ERROR (µm) S3270 +100 -100 -20 -15 -10 -5 0 +5 +10 +15 +20 POSITION ON PSD KPSDC0068EA ■ Conversion formula of spot light position on the PSD If output signals (photocurrent) I1 and I2 are obtained from electrodes X1 and X2, then the light spot position (x) on the PSD can be found by the following formula. L X2 X1 x I2 - I1 2x = I1 + I2 L ACTIVE AREA KPSDC0010EA ■ Correction for position detection error Position detection characteristics obtained by the above formula can be corrected to reduce position detection errors. For example, the maximum position detection error (±120 µm) of S3931 can be significantly reduced to ±9 µm by using the least square method. 3 One-dimensional PSD S3931, S3932, S3270 ■ Dimensional outlines (unit: mm) S3932 9.2 ± 0.2 15.2 ± 0.2 4.8 ± 0.2 PHOTOSENSITIVE SURFACE ACTIVE AREA PHOTOSENSITIVE SURFACE 0.7 4.0 4.0 1.5 ± 0.2 (4 ×)0.25 5.08 ± 0.3 1.5 ± 0.2 0.7 (4 ×)0.25 X X 5.08 ± 0.3 ACTIVE AREA 4.8 ± 0.2 S3931 CATHODE (COMMON) ANODE (X2) CATHODE (COMMON) ANODE (X1) (4 ×) 0.4 5.08 ± 0.3 (4 ×) 0.4 10.16 ± 0.4 CATHODE (COMMON) ANODE (X2) CATHODE (COMMON) ANODE (X1) KPSDA0048EA KPSDA0049EA S3270 5.5 ± 0.25 ACTIVE AREA 55 ± 0.5 2.2 3.0 42.3 ± 0.4 1.0 5.0 ± 0.2 X (2 ×) R1.1 R2.0 0.45 ± 0.05 LEAD 40.3 ± 0.4 1.7 3.75 ± 0.25 1.4 PHOTOSENSITIVE SURFACE 1.0 8.5 ± 1.5 2.5 ± 0.2 4.0 ANODE (X1) CATHODE (COMMON) ANODE (X2) KPSDA0050EB Information described in this material is current as of April, 2011. Product specifications are subject to change without prior notice due to improvements or other reasons. Before assembly into final products, please contact us for the delivery specification sheet to check the latest information. Type numbers of products listed in the delivery specification sheets or supplied as samples may have a suffix "(X)" which means preliminary specifications or a suffix "(Z)" which means developmental specifications. The product warranty is valid for one year after delivery and is limited to product repair or replacement for defects discovered and reported to us within that one year period. However, even if within the warranty period we accept absolutely no liability for any loss caused by natural disasters or improper product use. Copying or reprinting the contents described in this material in whole or in part is prohibited without our prior permission. 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) 8152-375-0, Fax: (49) 8152-265-8 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 int. 6, 20020 Arese, (Milano), Italy, Telephone: (39) 02-935-81-733, Fax: (39) 02-935-81-741 4 Cat. No. KPSD1002E06 Apr. 2011 DN