Wiring base for photoelectric scanning unit

A wiring base for use with an optical sensor receiving light along an axis of sensitivity with respect to a structure, the wiring base comprising:

• a conductive housing having walls surrounding a volume, at least one wall having a hole sized to admit a cable having a shield and conductive wires;
• a plurality of first wire terminals adapted to electrically connect to the wires, the first wire terminals mechanically affixed to the conductive housing within the volume but electrically insulated from the conductive housing;
• at least one second wire terminal adapted to electrically connect to the shield and mechanically affixed to the conductive housing within the volume and electrically connected to the conductive housing;
• an alignment guide affixed to the conductive housing and adapted to receive a housing of the optical sensor along an insertion axis and to hold the optical sensor in a predetermined orientation with respect to the conductive housing whereby the orientation of the optical sensor when affixed to the conductive housing is uniquely determined by the orientation of the conductive housing;
• an electrical connector having conductors electrically communicating with the first wire terminals, the connector mechanically attached to the conductive housing to receive a mating connector of the optical sensor along the insertion axis when the optical sensor is affixed to the conductive housing;
• mounting means for mounting the conductive housing in a predetermined orientation with respect to the structure;
• and
• whereby the conductive housing forms at least a part of a Faraday cage around the first and second wire terminals when the housing of the optical sensor is in position on the conductive housing.