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The focal plane was designed for 30 frames per second operation with a 56 to 1 oversampling rate. This provides an equivalent well capacity of 1.2E8 electrons and a quantization error of 14 bits. On focal plane power dissipation is less than 100 milliwatts total or 28 nanowatts per A/D converter. This camera design included 25MM f2.3 optics with a 3 to 5 micron filter on the cold shield. Measured NETD is under 10 milliKelvin.
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This picture was taken one hour after sunset looking north east from
the front of our facility. The building across the parking lot is still warm
as is the portion of the parking lot that was exposed to sunlight. The automobile
has been in the shade of our building all day. Dynamic range is set at 50
milliKelvin to provide adequate contrast without too much saturation such
that much of the image would be lost. Depending on the quality of your graphical
display some interesting artifacts may be visible. There are one inch thick
wood fascia boards above the windows of the building on which vertical stripes
are just perceptible. These are the support timbers behind the fascia that
can not be seen with visible light or with IR cameras with less dynamic range.
Also visible is a thermal shadow from an automobile that was parked in front
of the building earlier. |
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This is a composite picture showing the contrast of an outdoors view
in early morning and an office with normal interior lighting. The truck has
been parked for several hours and has had time to cool. Behind the truck,
the glow from warm tires, and their tracks, can be seen from an automobile
that just arrived. |