Photoelectric Switch minimum sensing distance

We are using the Banner QS18VN6D and we are noticing that we are having some issues sensing our note right up to the sensor. We are aiming the sensor through a hole of a polycarbonate plate. Are there any possible reasons for this issue or is it just a limitation of the sensor. We tested the sensor without any mechanisms just hooked up to a RoboRIO and we did not have any issues with a minimum distance.

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