OTC-239

OTC-239 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 TO18 metal housing, with 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. The thermopile sensors are featured with an additional thermistor on the same package. The standard version of thermistor is housing conneccted 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, 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 / 7 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 1920 x 725 500 x 500 ------µm2 µm2 Thickness of substrate Resistance of thermopile Sensitivity Detecctivity Time Constant Noise voltage NEP Temperature range Temperature reference resistor Resistance (1) Resistance (2) Βvalue (1) Βvalue (2) 600 60 45 4*107 ------- 625 70 55 7*107 30 34 0.8 --- 650 80 65 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 0oC/25 °C 0oC/25 °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. ▓ Thermopile voltage vs. blackbody temperature ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, 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 / 7 ▓ Frequency response ▓ Field of view ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, 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 / 7 ▓ 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 °C, R(T)=R25e β  T T25  1 1   − describes the resistance vs. temperature, ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, 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 / 7 where R25 is the resistance at ambient temperature 25 °C and T, T25 are the ambient temperatures in unit of kelvin degrees. 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 ▓ Order information : OTC-239-A A : 1 2 : : standard filter (5-14 µm) silicon filter with flat band transmission ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, 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 / 7 ▓ Transmission of filter Transmission of optical filter is measured by FTIR from 2 µm ▓ Package The sensor is hermetically sealed into a TO-18 metal housing, with 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. 4.7000 3.0000 WINDOW IR FILTER 0.43 Unit: mm 2.0 CHIP CAP 3.6 HEADER ROITHNER LASERTECHNIK Address Tel. No. Fax No. E-Mail http : : : : : Schoenbrunner Str. 7, 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 / 7 ▓ Application circuit 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, 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 / 7