Photovoltaic materials and methods of photovoltaic cell fabrication provide a photovoltaic cell in the form of a fiber. Each different molecular probe is selected to interact with a different corresponding target, and the indicator response is detectable after removing the indicator from the condition. The elastic pad comprises at least one protrusion structure, and the at least one protrusion structure is capable of inserting into a waterproof groove on the housing corresponding to the protrusion structure. Control logic may be configured to dynamically place the active termination circuit into the foregoing differential mode termination configuration during a differential transmission mode. When the radiation detector receives a 10 to 300 mR dose of the radiation, the numbers X and L, the entrance efficiency T, the fill factor F and the photoelectric conversion efficiency of each photoelectric converter, and the maximum storable charge amount Q of the capacitor satisfy a relationship XLTFQ. The at least one mounting member is connected with the first installation rail and the second installation rail to enclose the at least one opening.