PSD One-dimensional PSD S3979, S3931, S3932, 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 x 3 mm active area sealed in a TO-5 package. S3931 and S3932 have an active area of 1 x 6 mm and 1 x 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 x 37 mm General ratings / Absolute maximum ratings Type No. S3979 S3931 S3932 S3270 *2 Package TO-5 Ceramic Window material *1 K R R R (B) Active area size (mm) 1x3 1x6 1 x 12 1 x 37 Absolute maximum ratings Reverse voltage Operating temperature Storage temperature Topr Tstg VR Max. (V) (C) (C) 20 -10 to +60 -20 to +80 -10 to +75 Electrical and optical characteristics (Typ. Ta=25 C, unless otherwise noted) Position Temp. Terminal Interelectrode Rise time Saturation Dark detection error *3 coefficient capacitance Position 4 resistance tr photocurrent * current E Ct of resolution Rie ID VR=5 V VR=5 V Type No. VR=5 V *5 VR=5 V ID Vb=0.1 V RL=1 k VR=5 V RL=1 k TCID light spot 200 m f=10 kHz Min. Typ. Max. Typ. Max. Typ. Max. (nm) (nm) (A/W) (k) (k) (k) (m) (m) (A) (nA) (nA) (times/C) (s) (pF) (m) S3979 100 140 180 15 60 40 0.1 5 2.5 20 0.1 0.55 320 to 1100 920 S3931 30 120 0.15 10 1.5 40 0.2 1.15 30 50 80 100 S3932 60 240 0.2 20 3.0 80 0.3 S3270 0.55 10 15 20 100 400 300 0.5 20 1.0 100 2.8 700 to 1100 960 *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) Photocurrent: 1 A Spot light size: 200 m Circuit system input noise: 1 V (1 kHz) Frequency range: 1 kHz Interelectrode resistance: Typical value (refer to the specification table) Photo Peak Spectral response sensitivity sensitivity range wavelength S =p p 1 One-dimensional PSD Spectral response Photo sensitivity temperature characteristics (Typ. Ta=25 C) 0.8 TEMPERATURE COEFFICIENT (%/C) 0.6 S3979 S3931 S3932 0.4 0.2 S3270 QE=50 % 0 400 600 800 (Typ.) +2.0 QE=100 % PHOTO SENSITIVITY (A/W) S3979, S3931, S3932, S3270 +1.5 +1.0 S3270 0 -0.5 300 1000 S3979, S3931, S3932 +0.5 WAVELENGTH (nm) 400 500 600 700 800 900 1000 1100 WAVELENGTH (nm) KPSDB0070EB KPSDB0069EB Dark current vs. reverse voltage Terminal capacitance vs. reverse voltage (Typ. Ta=25 C) S3270 DARK CURRENT 1 nA 100 pA S3932 S3931 S3979 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 S3979 1 10 100 REVERSE VOLTAGE (V) KPSDB0071EB 2 (Typ. Ta=25 C, f=10 kHz) 10 nF TERMINAL CAPACITANCE 10 nA KPSDB0072EB One-dimensional PSD S3979, S3931, S3932, S3270 Example of position detectability (Ta=25 C, =900 nm, spot light size: 0.2 mm) S3979 S3931 +150 POSITION DETECTION ERROR (mm) POSITION DETECTION ERROR (mm) +150 +100 +50 0 -50 -100 +100 +50 0 -50 -100 -150 -150 -1.5 -1.0 -0.5 0 +0.5 +1.0 POSITION ON PSD (mm) -3 +1.5 -2 -1 +1 +2 POSITION ON PSD (mm) KPSDB0010EB S3932 +3 KPSDB0011EB POSITION DETECTION ERROR (m) S3270 +150 POSITION DETECTION ERROR (mm) 0 +100 +100 -100 -20 -15 -10 -5 0 +5 +10 +15 +20 POSITION ON PSD KPSDC0068EA +50 0 -50 -100 -150 -6 -5 -4 -3 -2 -1 0 +1 +2 +3 +4 +5 +6 POSITION ON PSD (mm) KPSDB0012EB 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 m) of S3931 can be significantly reduced to 9 m by using the least square method. 3 One-dimensional PSD S3979, S3931, S3932, S3270 Dimensional outlines (unit: mm) S3979 S3931 ACTIVE AREA X ACTIVE AREA 4.8 0.2 9.2 0.2 PHOTOSENSITIVE SURFACE 9.2 0.2 4.0 (4 x)0.25 CATHODE (COMMON) ANODE (X2) CATHODE (COMMON) ANODE (X1) (4 x) 0.4 5.08 0.3 0.45 LEAD 5.08 0.3 1.5 0.2 0.7 13.7 PHOTOSENSITIVE SURFACE 4.1 0.2 X 8.1 0.1 2.7 WINDOW 5.9 0.1 5.08 0.2 KPSDA0048EA ANODE (X2) ANODE (X1) CATHODE (COMMON) CONNECTED TO CASE KPSDA0007EC S3932 55 0.5 2.2 42.3 0.4 1.0 (2 x) R1.1 4.0 CATHODE (COMMON) ANODE (X2) CATHODE (COMMON) ANODE (X1) (2 x) R2.2 PHOTOSENSITIVE SURFACE 3.75 0.25 1.4 8.5 1.5 2.5 0.2 (4 x)0.25 5.08 0.3 X 4.0 1.5 0.2 0.7 10.16 0.4 3.0 5.0 0.2 X (4 x) 0.4 ACTIVE AREA 5.5 0.25 PHOTOSENSITIVE SURFACE 1.0 ACTIVE AREA 4.8 0.2 15.2 0.2 S3270 0.45 0.05 LEAD 40.3 0.4 1.7 KPSDA0049EA ANODE (X1) CATHODE (COMMON) ANODE (X2) KPSDA0050EA 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. (c)2007 Hamamatsu Photonics K.K. 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: Smidesvagen 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 4 Cat. No. KPSD1002E04 Nov. 2007 DN