COMPONENT
IR100 & IR120
Infra-red Remote Temperature Sensors
Overview
The IR100 & IR120 sensors offer a non-contact means
of measuring the surface temperature of an object by
sensing the infra-red radiation given off. They can be
used in the measurement of leaf, canopy and average
surface temperature.
Simple to install, the IR100 & IR120 do not influence
the target temperature and are an effective means of
getting a spatial average temperature. The sensors
work with Campbell Scientific’s CR800, CR1000 or
CR3000 or any logger able to offer reverse excitation.
A built in amplifier offers good noise immunity. The
IR100 has an ultra-narrow field of view (4-5° half-
angle) with a reduced output signal (5 mV per °C).
The IR120 has a wider field of view (20° half-angle)
with a larger output signal (20 mV per °C).
Both variants of these sensors limit sensitivity to the
long wave, infra-red spectrum as required for infra-
red thermometry. The IR120 has an additional filter
to block radiation below 7 µm so is better suited to
applications where solar radiation may be reflected
into the sensor.
The sensors contain a thermopile detector which
detects the presence of thermal radiation. The
thermopile detector consists of a number of
thermocouples connected in series, one set being
exposed to the source of radiation, whilst the
other is shielded from it. A highly polished metal
cone concentrates the radiation onto the exposed
junctions, which are coated with lamp-black to
enhance the efficiency with which the radiation is
absorbed. The thermopile detector outputs a voltage
proportional to the thermal energy balance between
itself and the surface it is detecting.
A separate calibrated thermistor, embedded in
the sensor body directly behind the thermopile
measures the reference body temperature. Both
results are combined and processed in the logger to
output the measured surface temperature.
For outside use, the sensors can be mounted within
a simple solar shield to reduce errors caused by rapid
temperature changes.
The manual contains full details of the post
processing analysis including worked examples of
emmissivity compensation.
www.campbellsci.eu/ir100_ir120
More info:
+44(0) 1509 828 888
Contactless
temperature sensor
Effective means of getting a spatial
average temperature
Campbell Park, Shepshed, LE12 9GX UK | +(0)1509 828888 | sales@campbellsci.co.uk | wwwcampbellsci.eu
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Benefits and Features
Contactless sensor
Excellent spatial averaging
Narrow field of view (4 or 20
°
half-angle)
Good noise immunity
Typical Applications
Ideal for measuring spatial average temperature (e.g.: leaf/
canopy temperature)
Ideal for non contact temperature measurement (e.g.: road
surfaces)
