OTC-236 Thermopile Infrared Sensor Features The thermopile sensor consists of a series of 44 thermoelements, forming a sensitive area of 0.5*0.5 mm2. The sensor is hermetically sealed into a TO-5 metal housing, with an optical filter. This standard filter allows measurements to be made in the spectral range above 5m wavelength. The thermosensor exhibits an almost white noise, comparable to an ohmic resistance. It has a constant signal versus frequency up to its frequency limit, and is directly proportional to incident radiation. The thermopile sensors are featured with an additional temperature reference resistor on the same chip. The standard version of temperature reference resistor is housing connected to ground. Applications * Ear thermometers; clinic thermometers * Infrared thermometers * Consumer applications: hair dryer, micro-wave oven, air conditioner, refrigerator * Continuous temperature control of manufacturing * Security system * Radiation monitor switch system * Absorbing measurement for gas analysis * Thermoelectric converter * Heat flux flowmeter OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 1/9 OTC-236 Thermopile Infrared Sensor Electrical Characteristics Parameter Condition Min. Typ. Max. Unit Number of thermojunctions --- 44 --- Chip size --- 1920*1725 --- m2 --- 500*500 --- m2 Thermopile Active area Interference layer Thickness of substrate Siliconsubstrate 600 625 650 m Resistance of thermopile 25 60 70 80 K Sensitivity With 5-14m filter 40 55 70 V/W 4*107 7*107 9*107 cm*Hz1/2/W Time constant --- 30 --- ms Noise voltage --- 34 --- nV/Hz1/2 NEP --- 0.8 --- nW/Hz1/2 -20 --- 100 Detecctivity Temperature range Operation --- Temperature reference resistor 25 920 1000 1080 Temperature coefficient of resistance 25 3470 3700 3920 ppm/K Resistance Measured at 1 Hz chopper frequency, within spectral range 5-14m, using a blackbody radiator of 500K temperature. Note : Thermistor should be operated under 200A. OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 2/9 OTC-236 Thermopile Infrared Sensor Thermopile voltage vs. blackbody temperature Frequency response OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 3/9 OTC-236 Thermopile Infrared Sensor Field of view 1) window size: 2.57mm (diameter) 2) window size: 3.80mm (diameter) OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 4/9 OTC-236 Thermopile Infrared Sensor Thermistor vs. temperature The resistance of the temperature reference resistor varies with temperature and the behaviour is illustrated in the following figure. At temperature 25, the relation R = Ro[(1+(T-To)+(T-To)2)] is almost linear, where the typical value of is 3.6*10-6 << 1 and(temperature co-efficient of resistance) is 3.7*10-3 defined as : = OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 5/9 OTC-236 Thermopile Infrared Sensor Pin assignment & description 2 thermistor pin 4 thermistor pin (GND) 1 thermopile output pin (+) 3 thermopile output pin (-) Thermopile Thermistor 2(R) 1(V+) 3(V-) 4(GND) SIDE VIEW BACKSIDE VIEW Order information : OTC-236-AB A B : : 1 : standard filter (5-14m) 2 : silicon filter with flat band transmission 3 : band pass filter 1 : window size = 2.57mm (diameter) 2 : window size = 3.80mm (diameter) OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 6/9 OTC-236 Thermopile Infrared Sensor Transmission of filter Transmission of optical filter is measured by FTIR from 2m Package The sensor is hermetically sealed into a TO-5 metal housing, with an optical filter. This standard filter allows measurements to be made in the spectral range above 5m wavelength. The dimensions of header and cap are shown below. OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 7/9 OTC-236 Thermopile Infrared Sensor OTC-236-11 Unit: mm 8.15 Chip Cap 2.00 5.0 4.6 2.57 Header 4.3 Window Window IR Filter filter OTC-236-12 Unit: mm 8.17 Chip 2.0 Cap 4.6 3.80 Header 0.43 WIindow Window IR IR Filter filter OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 8/9 OTC-236 Thermopile Infrared Sensor Application circuit Circuit 1 : +5V C1 R1 Thermopile R4 + R2 C3 R5 3 2 4 Vout + OP R6 1 C6 C4 C5 Reference Resistor R3 C2 Circuit 2 : Ambient Temperature Compensation Circuit Pre-Amplification Circuit +5V R10 + A2 Thermopile (+) - +5V Adder C1 C3 + A1 - Thermopile (-) R13 R11 1 + 3 - R1 C4 Vout R7 2 4 + A3 - R8 C2 reference resistor R9 R12 R2 OPTO TECH CORPORATION Tel: 886-3-5777481 Fax: 886-3-5783696 http://www.opto.com.tw OPTO TECH Microelectronics Dept. 2000.01 9/9