IR trip wire/barrier

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i'm attempting use tssp4038 , tsal6200 create infrared trip wire.  trip wire needs 16" across.  i've tried pulse emitter @ 38khz using tone() can't seem working correctly.  circuit sort of works if use continuous power emitter, can 7inches, i'm sure have set correctly. 

i have 555 timer use well, i've never used 1 before , wanted test distance of trip wire first.  according data sheets should able 25 meters, think 1 , half feet should easy.

does ambient sunlight/ceiling light make big difference?  other tips?  have found pretty limited information online, resource helpful. thanks.

how driving emitter?  a schematic help.  you can have emitter inside tube shield ambient light make more directional.  same detector.


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