CHAPTER 3
THROUGH-THE-LENS (TTL) INTRA-OPTICAL LIGHT
SIGHTING (Patent No. 4,494,881)
3.1 TTL SIGHTING
With the Everest Through-The-Lens (TTL) Intra-Optical Light Sighting System (Patent No. 4,494,881), an illuminated image of the infrared detector is projected directly through the infrared optics of the infrared temperature sensor, illuminating the exact area where a temperature measurement is being taken. Because this light shares the internal optical path, it can never be knocked out of alignment. It will always illuminate the area where the infrared/visible
optics are focused.
3.2 FOCUSING WITH THE VARIO-ZOOOM
In order to focus on a smaller or larger area, the front of the Vario-Zooom(Patent Pending) infrared thermometer need only be pushed in or out until the target is completely illuminated. Simply point the instrument at a target in subdued ambient light and push the front optics in or pull it out in order to focus the infrared
thermometer to display the field-of-view (FOV) of the instrument.
A picture of the Front Optics of the AGR-THERM II Infrared Thermometer with the antenna extended for Dry Bulb Ambient Air Temperatures is shown below:
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