IR detector at large distances

Hi guys,

Brainstorming in the shower as you do.

I have a question.

My idea is to have a IR strobe (similar to those that get used in the military, Phoenix Jr) at a distance of perhaps up to 100m, more commonly 20-30m.
I would like to detect this IR strobe light, either by actually seeing it (like an attachment to a rifle scope) or detect it using a phototransitor.

It wouldn’t have to measure the strength of the signal, just whether or not the direction that I am pointing there is the IR strobe?

Is this possible?