A sensor assembly for detecting an object and a method of forming a sensor port in sheet metal are disclosed. The sensor assembly includes at least one electromagnetic source for emitting electromagnetic waves. The sensor assembly also includes at least one electromagnetic receiver for receiving the electromagnetic waves after reflecting from the object and corresponding with a detection of the object in proximity to the sensor assembly. In addition, the sensor assembly includes a filter cover disposed adjacent to and covering the at least one electromagnetic source and the at least one electromagnetic receiver configured to allow the electromagnetic waves to pass therethrough while reflecting visible light, thereby concealing the at least one electromagnetic source and the at least one electromagnetic receiver.