OTC-236

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 µm 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 5-14µm filter --- 44 1920*1725 500*500 ------µm2 µm2 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 µm 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 µm, 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 µm) 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 µm ▓ 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 µm wavelength. The dimensions of header and cap are shown below. OTC-236-11 Unit: mm ψ8.15 ψ5.4 ψ2.57 2.00 4.6 0.43 Window Window IR IR Filter filter Chip Cap Header OTC-236-12 Unit: mm 8.17 2.00 ψ3.8 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