The invention relates to automated methods for creating offers for items to a customer. The PSGC separates a received optical signal into two orthogonal polarizations and directs the two polarizations to separate waveguides on an integrated circuit. The receiving groove is configured for receiving a circular workpiece of which a diameter is to be measured. A power supply is disposed outside the sealed container and supplies power inductively to the power receiver sub-assembly through the sealed container such that the sealed container is not structurally breached.