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\subsubsection{Breakbeam Sensors}  Break-beam sensors also referred to as opposed mode photoelectric sensors have a very simple method of operation. The premise (as depicted in [INSERT FIGURE]) \ref{fig:breakbeam})  is that an emitter is placed across from a receiver. The emitter directs a beam of light towards the receiver, and an object is detected when this beam is broken. Break-beam sensors are very reliable when it comes to detecting opaque objects, perform well in the presence of other light sources and have a long sensing range \cite{BannerEngineering}. These sensors are often used for applications where counting is required, though could be used to detect the presence of the tray and the candlelights it contains.