A nozzle system for a fluidized bed including a pipe for insertion through an air distributor plate in the fluidized bed and extending up through a refractory material on the air distributor plate. In the present invention, a magnetic body is pre-anchored at a specific position inside a luminal organ. A pair of joint side plates is coupled to the first and second tab with one or more conductors extending through the flange plate in between the joint side plates. An array of photo-detectors converts the spectral components into electronic signals corresponding to the plurality of modulation frequencies.