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| Thermopile Infrared Sensor Features TP337 The thermopile sensor consists of a series of 116 thermoelements, forming a sensitive region size of 545m (diameter). 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. 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 Thermopile Infrared Sensor Electrical Characteristics TP337 Parameter Thermopile Number of thermojunctions Chip size Active region size Condition Min. Typ. Max. Unit ----Interference layer Siliconsubstrate 25 With 5-14m filter --- 116 1740*1740 Diameter 545 625 60 85 1.3*108 16 31 0.36 --- ------m2 m Thickness of substrate Resistance of thermopile Sensitivity Detecctivity Time constant Noise voltage NEP Temperature range Temperature reference resistor Resistance 600 50 70 1.0*108 --28 0.28 650 70 100 1.7*108 --33 0.48 100 --- m K V/W cm*Hz1/2/W ms nV/Hz1/2 nW/Hz1/2 Operation -20 25 29.1 3773 30.0 3811 30.9 3849 K K Temperature coefficient of resistance 25 Measured at 1 Hz chopper frequency, within spectral range 5-14m, using a blackbody radiator of 500K temperature. Note : Thermistor should be operated under 1mA. Thermopile Infrared Sensor Thermopile voltage vs. blackbody temperature TP337 Frequency response Thermopile Infrared Sensor Field of view 1) window size: 2.57mm (diameter) 337A TP337 2) window size: 3.80mm (diameter) 337E Thermopile Infrared Sensor Thermistor vs. temperature TP337 The resistance of the temperature reference resistor varies with temperature and the behaviour is illustrated in the following figure. At temperature 25, R(T)=R25e describes the resistance vs. temperature, where R25 is the resistance at ambient temperature 25 and T, T25 are the ambient temperatures in unit of kelvin degrees. - Thermopile Infrared Sensor Pin assignment & description 2 4 1 3 thermistor pin thermistor pin (GND) thermopile output pin (+) thermopile output pin (-) Thermistor Thermopile TP337 2(R) 3(V-) 1(V+) 4(GND) BACKSIDE VIEW SIDE VIEW Order information : TP337 : A B E F : : : : Standard filter (5-14m), window size=2.57mm (diameter). Silicon filter with flat band transmission, window size=2.57mm (diameter). Standard filter (5-14m), window size=3.80mm (diameter). Silicon filter with flat band transmission, window size=3.80mm (diameter). Thermopile Infrared Sensor Transmission of filter Transmission of optical filter is measured by FTIR from 2m TP337 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. Thermopile Infrared Sensor TP337 TP337A Unit: mm 2.00 4.6 Window IR Filter filter 0.43 Cap Header 8.15 5.4 2.57 Window TP337E Unit: mm 8.17 2.00 4.6 3.80 0.43 Chip Cap Header WIindow Window IR IR Filter filter Thermopile Infrared Sensor Application circuit TP337 Circuit 1 : +5V C1 R1 Thermopile 1 3 C3 R5 C4 C5 + OP R6 Vout C6 2 4 R2 R4 Reference Resistor R3 + - C2 Circuit 2 : Pre-Amplification Circuit Ambient Temperature Compensation Circuit +5V R10 + A2 Thermopile (+) R7 Adder C1 C3 Vout 2 4 R11 R13 + A3 R8 C2 R9 reference resistor C4 +5V R1 + A1 R2 1+ 3Thermopile (-) R12 |
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