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2 Unknown thermal camera assemblys

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angelortega:
Does any one have an idea what they are, they look to me like some kind of cooled camera-optical-lens ,there is a larger germanium lens that look like it maybe a double concave lens for an input window and a smaller germanium output window, witch looks to be where the camera mounts to. In has 12 contact pins  in two by two sets,it also has what looks like a small screw in cooling connector ,with a larger outer sleeve for insulation of the coollant line.

Fraser:
They look like the scanning mirror assemblies from a modular thermal camera as used in military applications.

Fraser

angelortega:
Thanks fraser, I have two so I will open up the one with the low-res numbers on it to see what's inside,the other I will keep as is to see if I can get it working after seeing what each pin controls     thank you

Fraser:
If it is is scanning assembly, it will likely have been used with something like a cooled Sprite detector or a fully cooled (77K) detector. Some scanning assemblies use two mirrors whilst others use a single mirror combined with a linear detector array. I have shown such camera designs on this forum. Look for AGEMA 450, AGEMA 470 and AGEMA 510 in this area of the forum. The lenses will be coated for the band of the detector and that is often MWIR so the lenses may, or may not be useable with a LWIR microbolometer.

If you have an interest in scanning type thermal imaging systems I will see what I can dig up on them for you. They came before FPA’s when it was easier to produce a single detector pixel or a linear array of them, as found in the AGEMA 510.

Building a complete thermal camera based upon a scanning assembly is quite the task so do consider the complexity and cost of such before embarking on that adventure.

Fraser

Fraser:
Regarding electrical connectivity to a scanning assembly…. You will normally find power feeds to the galvanometers or motors, mirror position sensors, miniature black body references and possibly temperature sensors as Germanium changes its transmission figures with changes in temperature. The scanning assembly interior can be either at atmospheric pressure or a partial vacuum.

Fraser

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