I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite this the IR signal is able to be detected through the foil. Even when I surround the sensor with aluminium foil it is sensing an IR signal. The aluminium foil has decreased the sensing distance but not as much as is necessary. I'm wondering why this is not working as well as expected and what materials might work better as blinders for the sensor.

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    \$\begingroup\$ Wouldn't a material which absorbs IR work better instead of one that is highly reflective? \$\endgroup\$ – Arsenal Mar 29 '18 at 16:25
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    \$\begingroup\$ Yes! I Agree with @Arsenal. I think your IR signal is getting reflected from the Aluminium foil and somehow getting re-reflected off some other material and reaching it to your detector. So, it is best to use some opaque and non-reflective material for the blinder (i.e black plastic material or cardboard would work just fine). \$\endgroup\$ – dr3patel Mar 29 '18 at 16:25
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    \$\begingroup\$ @dr3patel note that black plastic might still be too reflective (most of the plastics come out of a polished form), so it might be needed to roughen up the surface to get better absorption. \$\endgroup\$ – Arsenal Mar 29 '18 at 16:38
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    \$\begingroup\$ Post a photo of your problem layout. \$\endgroup\$ – Transistor Mar 29 '18 at 16:48
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    \$\begingroup\$ you are not thinking clearly .... you are using a mirror to prevent reflections \$\endgroup\$ – jsotola Mar 29 '18 at 17:16

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