The invention includes a method of separating isotopes from a mixture containing at least two isotopes in a solution. A second connection port coupled to a first connection port is disposed on the secondary circuit board at the corresponding side of the primary circuit board, and a third connection port coupled to an electronic device is disposed on the other side, and the number of the third connection ports corresponds to that of the electronic devices. The control unit and the sensor system are preferably disposed on differing sections of the gear housing. The reference beam and the data beam spatially scan the cells and are frequency swept during their respective spatial scans.