smartec b.v. infrared sensor type: SMTIR9901/9902 version : 3.1 date : jan 2003 1 ---------------------------------------------------------------------------------------------------------------------------------------- 1 introduction the smartec infrared sensor SMTIR9901 and smtir9902 are sophisticated full silicon infrared sensors. the sensors can be used in measuring the radiation temperature without any contact. for the different radiation temperature ranges various filters are available. the sensor type smtir9902 contains a temperature sensor for measuring the temperature of the sensor itself. the temperature range of the sensor - element is between - 40 to 100 oc. the sensor is available in a standard to - 05 encapsula tion and with a 5.5. m m high pass filter. 2 typical applications contactless measurement of surface temperatures or infrared radiation temperature measurement on moving objects. continuous temperature control of manufacturing. thermal alarmsystems clim ate control medical instruments home appliances. easy and accurate measuring of the sensors temperature by means of a built - in temperature sensor(only for type smtir9902). the main characteristics of the infrared sensor are: high accuracy high sensitivit y (110 v/w) low resistance (50 k w ) and therefore very good signal - to - noise - ratio good response time (40 ms) low cost thin film technology 3 pin - out and housing (to 5) sensor surface all sizes in mm. bottom view 8.15 3.9 4.4 1.8 5.1 8 1 2 3 4 smtir9902 1 = det - 2 = det + 3 = ni1000 4 = ni1000 s mtir9901 1 = det - 2 = det + 3 = n.c. 4 = gnd .com .com .com 4 .com u datasheet
smartec b.v. infrared sensor type: SMTIR9901/9902 version : 3.1 date : jan 2003 2 ---------------------------------------------------------------------------------------------------------------------------------------- 4 product descr iption. thermopiles are based on the seebeck effect, which can be considered ever since a long time as standard for conventional thermocouples.the application of thin film technology allows the production of miniaturized and low cost sensor elements. a series connection of thermojunctions deposited on a silicon substrate forms the thermopile. the hot junctions are thermally isolated from the cold junctions on the substrate by etching an extremely thin membrane. a black absorbing layer on the hot junction s transform the incoming radiation into heat. a voltage proportional to the radiation is generated by the thermoelectric effect. the used thermopiles are processed on 400 m m silicon substrates using bisb and nicr for the thermojunctions. for different r adiation spectra various filters are available to find the optimal solution. 5 specifications parameters typical units number of thermojunctions 100 active area 0.50 mm2 die size 2.2 * 2.2 mm2 resistance of thermopile 50 15 k w sen sitivity 110 20 v/w 1) temp coeff of sensitivity - 0.52 0.08 %/k specific detectivity 2.1 * 10e8 cm.hz?/w 1) noise equivalent power 0.35 nw 1) noise voltage 37 nv/hz? time constant 40 10 ms (63 %) temperature range (senso r) - 20 - 100 oc storage temperature - 40 - 100 oc filter (high pass) 5.5 m 1) at 500 k,dc reference thermistor (smtir9902 only) resistance 1.000 0.004 k w ( @ 0oc) .com .com .com .com 4 .com u datasheet
smartec b.v. infrared sensor type: SMTIR9901/9902 version : 3.1 date : jan 2003 3 ---------------------------------------------------------------------------------------------------------------------------------------- filter (characteristic) 6 understanding the spec ifications sensitive area . the sensitive area is a square of .5 mm2. by using the distance between the sensor element and the glass filter and its diameter the field of view can be determined. the field of view can be changed by using special lenses. in case lenses are used the emissivity and the spectrum has to be considered. filter. the sensors are standardwise equipped with a high pass filter. from the theory it is well known that each body has a radiation at a certain temperature. this radiation tem perature has a frequency related to that temperature. for general use the filter used is a high pass filter with a cut - off wavelength of 5.5 m. sensor resistance . it must be clear that this type of thermopile has a reasonable output resistance. this res istance has to be considered when designing the input amplifier to prevent off - setts, etc. time constant . the time constant is the time needed to reach an output voltage of 66 % of the final level. this time constant only depends on the physical construc tion. 0 10 20 30 40 50 60 70 80 90 100 4 5 6 7 8 9 10 11 12 13 14 15 wavelength(micrometer) % .com .com .com .com 4 .com u datasheet
smartec b.v. infrared sensor type: SMTIR9901/9902 version : 3.1 date : jan 2003 4 ---------------------------------------------------------------------------------------------------------------------------------------- temperature reference resistor(smtir9902). it is well known that for application on a infrared sensor the temperature of the sensor must be considered in the calculation of the radiation temperature. the used resistor is a standard ni resistor with a value of 1000 w @ 0 c. the relation between the resistance value and the temperature is given below: r(t)=r0*(1+a*t+b*t 2 +c*t 4 +d*t 6 ) tolerance class b r0= resistance @ 0c = 1000 w t = temperature in c a = 5.485 * 10 - 3 b = 6.650 * 10 - 6 c = 2.805 * 10 - 11 d = - 2.000 * 10 - 17 7 ordering information SMTIR9901 infraredsensor without temperature sensor smtir9902 infraredsensor with temperature sensor for more information and or samples: smartec bv delpratsingel 26 4811 ap breda the neth erlands tel: * 31 76 520 5353 fax: * 31 76 520 5354 email: smartecnl@cs.com url: www.smartec.nl .com .com .com 4 .com u datasheet
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