IR Transparent (dark) dome

hi,

i working on proximity project ir emitter/receiver pair inside of enclosed area ir leds pointing out of hole. looking ir transparent "dome" of kind can use cover hole. hoping dark fresnel lenses amazon seen here:

http://www.amazon.com/120degree-pyroelectric-motion-sensor-fresnel/dp/b00xp5cmi0/ref=sr_1_5?ie=utf8&qid=1444686547&sr=8-5&keywords=fresnel+lens+pir

would work, instead blocking ir light.

can suggest similar not block ir?

thanks,
jose

i think you're reading wrong.

why lens made ir block ir.
leo..

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