Help with IR Trip Sensor
I am designing a system to log people entering and exiting a building.
In the past I designed a musical staircase using an inappropriate sensor but this time around I MUST have accuracy and reliability.
I would like to use an IR transmitter and receiver mounted next to each other and then a reflective plate across from it. A similar set up is shown in this picture http://imgur.com/Y8kh3b2
where the combo Rx/Tx are highlighted in red and the reflector is highlighted in yellow.
What I'm looking for is an appropriate IR receiver that is designed for continuous signals because in the past I had one NOT designed for such and encountered issues.
For edification, this is being setup in a library and the end goal is to have occupancy data for use in a correlation study.
Thanks in advance for your input.
TL;DR: I need to identify appropriate IR receiver sensor to allow continuous IR receiving as well as a reflector plate that I can use.