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THERMAL IMAGING PRODUCTS
ThermoScreen
Introduction
How
It Works
Communicable
Diseases
Applications
Features
Technology
Comparison
ThermoScreen
Technology
 Skin
Temperature Offset
Fever
Threshold
ThermoScreen
Operation
ThermoScreen
Software
Screening
Site Example
System
Components
Competitive
Advantages
Fever
Screening Standards
System Specifications
Micro
EL
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 sales@optotherm.com
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 ThermoScreen Infrared Fever
Screening System
Skin Temperature Offset
Studies have
shown that there is a correlation between internal body temperature and the
temperature measured at specific areas on the face using a thermal imager.
The maximum temperature measured between the eyes provides the best
correlation with internal body temperature for the following reasons:
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The ophthalmic artery is
located in this area and provides increased blood flow, and heat transfer,
to the skin surface.
-
The lachrymal duct provides a
thermally conductive path to deeper, warmer, tissue.
-
The skin is thin in this area,
decreasing the skin’s insulating affect.
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The inside corners of the eyes
are inset and are less affected by the ambient environment.
Due to the
skin’s insulating affect and the difference between internal body and
ambient air temperature, the temperature measured between the eyes is
slightly lower than internal body temperature. The temperature difference
is called the Skin Temperature Offset (see figure below) and its value
depends primarily on the ambient air temperature to which subjects have been
exposed. Higher ambient temperatures will result in higher skin
temperatures that are closer to internal body temperature. Likewise, lower
ambient temperatures will result in lower skin temperatures. When screening
subjects in automated mode, ThermoScreen uses the results from previously
screened individuals to automatically calculate and update the Skin
Temperature Offset.
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