TP297A

TP297A THERMOPILE INFRARED SENSOR ▓ Features The thermopile sensor consists of a series of 44 thermoelements, forming a sensitive area of 0.5 x 0.5 mm2. The sensor is hermetically sealed into a TO-5 metal housing, with optical filter. This filter allows measurements to be made in the spectral range above 8 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. The thermopile sensors are featured with an additional thermistor on the same package. The standard version of thermistor 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 ▓ Electrical Characteristics ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 1 / 8 Parameter Thermopile Number of thermojunctions Chip size Active area Condition Min. Typ. Max. Unit ----Interference layer Siliconsubstrate 25 °C With 5-14 µm filter --- 44 1920x1725 500x500 ------µm2 µm2 Thickness of substrate Resistance of thermopile Chip Sensitivity Detecctivity Time Constant Noise voltage NEP Temperature range Temperature reference resistor Resistance (1) Resistance (2) β value (1) β value (2) 600 60 40 4*107 ------- 625 70 55 7*107 30 34 0.8 --- 650 60 70 9*107 ------100 --- µm KOhm V/W cm*Hz1/2/W ms nV/Hz1/2 nW/Hz1/2 °C Operation -20 25 °C 25 °C 0°C/50 °C 0°C/50 °C 29.1 97 3773 3950 30.0 100 3811 3970 30.9 103 3849 3990 KOhm KOhm K K Measured at 1 Hz chopper frequency, within spectral range 5-14 µm, using a blackbody radiator of 500 K temperature. Note : Thermistor should be operated under 1 mA. ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 2 / 8 ▓ Thermopile voltage vs. blackbody temperature ▓ Frequency response ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 3 / 8 ▓ Field of view ▓ Thermistor vs. temperature At temperature 25 °C, R(T)=R25e describes the resistance vs. temperature, where R25 is the resistance at ambient temperature 25 °C and T, T25 are the ambient temperatures in unit of kelvin degrees. β  T T25  1 1  −  The resistance of the temperature reference resistor varies with temperature and the behaviour is illustrated in the following figure. ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 4 / 8 ▓ Pin assignment & description 2 4 1 3 thermistor pin thermistor pin (GND) thermopile output pin (+) thermopile output pin (-) Thermistor Thermopile 2(R) 3(V-) 1(V+) 4(GND) BACKSIDE VIEW SIDE VIEW ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 5 / 8 ▓ Transmission of filter Cut on wavelength : 8.0±0.5 (µm) Cut off wavelength : 14.0±0.5 (µm) Minimum average Transmission : >70% (with 9~13 µm) ▓ Package The sensor is hermetically sealed into a TO-5 metal housing, with optical filter. This filter allows measurements to be made in the spectral range above 8 µm wavelength. The dimensions of header and cap are shown below. ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 6 / 8 TP297A Unit: mm £r8.15 £r5.4 £r2.57 2.00 4.6 0.43 WINDOW WINDOW Window IR IR IR FILTER filter FILTER CHIP CAP HEADER ▓ Application circuit ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 7 / 8 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 ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, A-1040 Vienna, Austria +43 1 586 52 43-0 +43 1 586 52 43-44 office@roithner-laser.com www.roithner-laser.com page : 8 / 8