V. OPERATING PRINCIPLE
All objects, solid, liquid or gas, emit energy by radiation.
The intensity of this energy depends on the temperature
of the object.The EM-Th1 infrared thermometer is
therefore able to measure the temperature of a person
by the energy the person emits. This measurement can
be taken thanks to an external temperature probe on the
device which permanently analyses and registers the
ambient temperature. Therefore, as soon as the
operator holds the thermometer near the body and
activates the radiation sensor, the measurement is
taken instantly by detection of the infrared heat generat-
ed by the arterial blood flow. Body heat can therefore be
measured without any interference from the heat of the
surrounding environment.
THE DIFFERENT METHODS OF TEMPERATURE
MEASUREMENT
Core temperature
Core temperature is the most precise measurement and
involves measuring the temperature in the pulmonary
artery by means of a catheter equipped with a thermal
probe which can read the temperature in situ. The same
method is employed for probes measuring the oesopha-
geal temperature. However, such invasive temperature
measurement methods require specific equipment and
expertise.
Rectal thermometry
Rectal temperature adjusts slowly in comparison to the
evolution of the body’s internal temperature. It has been
demonstrated that rectal temperature remains raised
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