patented, systems make Everest Interscience’s infrared thermometers unique
for taking accurate temperature measurements outdoors. These include the
following: a SKY-SPY™ System (U. S. Patent No. 4,420,465),
VARIO-ZOOOM™ Field-Variable-Focus System (U. S. Patent No.
7,355,178), and TTL/SLR Intra-Optical Light Sighting System
(U. S. Patent No. 4,494,881). These features combined provide for the most
accurate possible infrared thermometers for measurements of outdoor
You may have noticed that some of your outdoor infrared thermometer
measurements have been inconsistent and non-repeatable under apparently
identical conditions. There is a reason for these errors. When an infrared
thermometer is calibrated indoors, it will be off by 1-2°C when used
outdoors. This is because the cold sky reflects off of the target’s
surface and into the thermometer. This reflection combines with the
target’s radiation signal causing an error. This error is dynamic and
unpredictable and can vary from 0.5°C to 2.0°C in a matter of minutes,
making reproducible readings impossible.
System “...provides a novel means for sensing the level of infrared
radiation received by the vegetation from a skyward direction,” according to
U. S. Patent No. 4,420,265. With this invention, a second wide-angle
optical system and detector are utilized wherein the reflection off of the
surfaces received from a skyward direction may be taken into account to
measure the “true” surface temperature of the target and not the “apparent”
temperature, thereby reducing inaccuracies caused by sky radiation.
Field-Variable-Focus Infrared Thermometry System
This new Field-Variable-Focus Infrared Thermometry System provides the first
infrared thermometry system capable of both varying the focus and field view
of the infrared thermometer to identify the exact target area where a surface
temperature measurement is being taken.
For the life of the
infrared industry, it has been necessary to be sure to match the infrared
thermometer to the application. If a person wanted to measure a very minute
target, it was necessary to purchase a close-focus instrument. For targets
at a greater distance, an infinity focus infrared thermometer was needed.
With the invention of the VARIO-ZOOOM™, the
Field-Variable-Focus Infrared Thermometry System, this is no longer
One infrared thermometer
can be used for both applications referred to above. The focus can be
easily changed simply by gently pushing the optics of the instrument in or
pulling it out. After finding the optimum focus, the operator can lock it
into place on the infrared sensors. The instrument will remain focused at
that distance until it is refocused. There is no lock on the handheld
units, but two rubber gaskets stop the optics from moving after the unit is
When focusing in the
laboratory, the next feature, the TTL/SLR Intra-Optical Light
Sighting System, assists in adjusting the variable field of view.
Light Sighting System
The Through-The-Lens/Single Lens Reflex Intra-Optical Light Sighting System
provides a means for the end user of an infrared thermometer to ascertain
exactly where a temperature measurement is being taken. With this system,
a light shares the same path as the infrared optics and illuminates the
exact target being measured. The source of this light is a safe Light
This invention arose
from a long-time need in the field of infrared thermometry. Other
conventional infrared thermometers have been unable to precisely align the
infrared sensor on the target and identify the exact target area being
measured. And, it is well known in the infrared industry that infrared
surface temperature measurement reading errors can result from improper
alignment of the infrared thermometer with the target.
When the optical system
of the infrared thermometer is not pointing directly at the target, the
detector collects energy coming from the target and the background,
thereby providing an erroneous reading. What’s more, since the infrared
beam is not visible to the human eye, the alignment of the IRT with the
target cannot be visually controlled with conventional infrared sensors.
With this system, the
exact location and dimensions of the target area under test are precisely
identified. This is true not only under static conditions, but also under
variable imaging conditions which may result when re-focusing the
Field-Variable-Focus infrared sensor.
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www.EverestInterscience.com to learn more about
the instrumentation offered by Everest Interscience.