SMTIR%209901/9902

1
SMTIR 9901/9902
SMARTEC INFRARED SENSORS
2
SMTIR9901/02
Smart temperature sensor
for contactless
temperature measurement
3
SMTIR9901/02
infrared radiation
not visible all objects above 0 K radiate
4
SMTIR9901/02
infrared radiation
warm body radiates more
than a
colder body
M f(T)
T Absolute temperature(K) M Radiated
power(W/m2)
5
SMTIR9901/02
how the sensor works
body
black receiver plate (sensor)
radiation
due to absorption of radiation
Tsensor ? Tbody
6
SMTIR9901/02
how the sensor works
cold junction hot junction
U out
radiation
can be measured with a thermocouple based on
Seebeck effect
Uout f(Tsensor , T body) f (? )
7
SMTIR9901/02
how the sensor works
for higher output voltage 100 thermocouples in
series
radiation
U out
black body has no spectral bandwith (therefor
black)
setup is not reliable due to open construction
8
SMTIR9901/02
how the sensor works
radiation
U out
filter is protection against dust, etc.
filter makes the sensor selective
sensor is filled with gas(N2)
9
SMTIR9901/02
the phenomena of radiation
50
45
T2000k
40
35
Blackbody curves
30
T1600 k
25
T1400k
20
15
10
5
0
1
2
3
4
5
6
Wavelength (?M) )
curves according to Planck functions
the maximum shifts in the right direction for
lower temperatures.
10
SMTIR9901/02
the phenomena of radiation
50
45
T2000k
40
Blackbody curves
35
30
T1600 k
25
T1400k
20
15
10
5
0
1
2
3
4
5
6
Wavelength (?M)
filter of 9901/02 in the area of human
temperatures
filter curve for 9901/02
other filters on request
11
SMTIR9901/02
the phenomena of radiation
T400 K
T350 K
T300K
Filter curve
Radiation
Wave length
? below curve is absorbed by the black sensor
receiving plate
change of filter will change optimal temperature
sensitivity
12
SMTIR9901/02
object
Uout depends on
Uout F(Tobj, Tsens)
filter characteristic
Uout ? F(Tobj-Tsensor)
object temperature
Uout0 if Tobj Tsensor
sensor temperature
angle of view
13
SMTIR9901/02
U out
calculation example of averaging
Tsurface 300 K Tspot 400 K
10 of surface 400 K
90 of surface 300 K
measured on sensor 0.9300 0.1400 310 K
14
SMTIR9901/02
where used?
some applications
contactless thermometers
person detectors
measuring instruments like CO2 analysis
15
SMTIR9901/02
16
SMTIR9901/02
setup for measuring radiation temperatures
T
T
?c
sensor temperature
black body source
blackbody temperature is controllable
sensor temperature has to be considered
17
SMTIR9901/02
setup for measuring radiation temperatures
measure output on various sensor temperatures
do the same for different body temperatures
make an array of output-voltages found
T sensor (ºC)
Uout in mV
T black body (ºC)
18
SMTIR9901/02
setup for measuring radiation temperatures
Tobject can be found by
sensortemperature
sensor outputvoltage
and
some calculations in microcontroller - two
dimensional interpolation
19
Thank you for your attention
tel [phone] SmartecNL_at_compuserve.com