Systems and methods for automated, rapid composting are disclosed. For each of a plurality of periodic targets target that each have a first structure formed from a first layer and a second structure formed from a second layer of the sample, a plurality of optical signals are measured at a plurality of incident angles, wherein there are predefined offsets between the first and second structures. A switching point is a time by which the measuring node node is expected to complete, at least in part, measurements of the one group and be ready to proceed with measurements of the next group. The fuel pump may be located substantially at the center of the inside bottom of the fuel tank. The pressure regulator regulates flow of fluid discharged from the coolant tank into the overflow tank. An arc-shaped first feed pattern is electromagnetically coupled to the first loop antenna 2 so as to supply electricity thereto and cause same to operate as a right-handed circularly polarized antenna.