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What's this thing on the microbolometer?

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Logan:
Hi guys.
I found a metal thing on my Scott's sensor package, it's like metal stick.
Please look at the 3 pictures, they were taken by Fraser, but we have a similar model. I marked that thing with an arrow.
That thing seems only exist on some microbolometers, not all models.
Does anyone know what's that for?
Thanks.

Fraser:
From memory it is the getter firing pin that is used to improve the quality of the vacuum during production.

Fraser

Fraser:
A thread you may find interesting……

https://www.eevblog.com/forum/thermal-imaging/the-ulis-02-05-01-microbolometer-an-insight-into-teh-technology-by-fraser/

Fraser

Fraser:
The manufacturer of getters for sensitive applications such as microbolometer arrays states the use of porous getters and films that operate at room temperature. I believe these are what you find in modern microbolometers…

https://www.saesgetters.com/products-functions/applications/sensors-and-mems

I cannot see an evaporative getter being used inside a microbolometer and the exact nature of a microbolometer getter that requires an activation pin is not known to me. It is likely detailed in microbolometer research documents though.

Fraser

Fraser:
Detail of a machine used for sensor assembly, including microbolometers. It states the getter is either heat or electrical activation.

https://bseteq.com/mems-packaging/

I assume in a microbolomter the getter material may be heated using a voltage and associated current applied to the getter pin but unlike a thermionic valve, it is a more refined process that activates the getters vacuum contaminant adsorbing properties without splattering material all over the interior of the module !

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