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| 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 5 m 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. 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 Electrical Characteristics Parameter Thermopile Number of thermojunctions Chip size Active area Condition Min. Typ. Max. Unit ----Interference layer Siliconsubstrate 25 C With 5-14m filter --- 44 1920*1725 500*500 ------m2 m2 Thickness of substrate Resistance of thermopile Sensitivity Detecctivity Time constant Noise voltage NEP Temperature range 600 60 40 4*107 ------- 625 70 55 7*107 30 34 0.8 --- 650 80 70 9*107 ------100 m KOhm V/W cm*Hz1/2/W Ms nV/Hz1/2 nW/Hz1/2 C Operation -20 Measured at 1 Hz chopper frequency, within spectral range 5-14 m, using a blackbody radiator of 500K temperature. Thermopile voltage vs. blackbody temperature Frequency response Field of view Pin assignment & description 1 3 thermopile output pin (+) thermopile output pin (-) Thermopile 2(R) 3(V-) 1(V+) 4(GND) BACKSIDE VIEW SIDE VIEW Order information : OTC-236-AB A : 1 2 : : standard filter (5-14 m) silicon filter with flat band transmission B : 1 2 : : window size = 2.57mm (diameter) window size = 3.80mm (diameter) Transmission of filter Transmission of optical filter is measured by FTIR from 2 m 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 5 m wavelength. The dimensions of header and cap are shown below. OTC-236-11 Unit: mm 8.15 5.4 2.57 2.00 4.6 0.43 Window Window IR IR Filter filter Chip Cap Header OTC-236-12 Unit: mm 8.17 2.00 3.8 WIindow Windo filter IR 0.43 4.6 Chip Cap Header Application circuit Circuit 1 : +5V C1 R1 Thermopile 1 3 C3 R5 C4 C5 + OP R6 Vout C6 R4 + R2 2 4 Reference Resistor R3 C2 Circuit 2 : Pre-Amplification Circuit Ambient Temperature Compensation Circuit +5V R10 + A2 Thermopile (+) R7 Adder C1 C3 R13 R11 2 4 + A3 R8 C2 R9 reference resistor Vout C4 +5V R1 + A1 R2 1+ 3Thermopile (-) R12 |
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