Abstract: A radio wave sensor installation method has the following steps. A sighting device is mounted onto a radio wave sensor. The direction of the radio wave sensor is adjusted using the sighting device. The direction of the radio wave sensor is fixed. The sighting device is removed from the radio wave sensor. The sighting device includes a first transparent member and a second transparent member different from the first transparent member. In the step of adjusting the direction of the radio wave sensor using the sighting device, the direction of the radio wave sensor is adjusted using a first sighting mark indicated on the first transparent member and a second sighting mark indicated on the second transparent member.

Abstract: A method of inspecting short circuit of an electrolyte membrane by a short circuit inspection apparatus includes an obtaining step of performing a process of obtaining the energization state of a limited range including divided portions that are adjacent to each other in a range which is smaller than the entire range of the plurality of divided portions, for each of a plurality of limited ranges provided at different positions, and a determination step of determining whether or not a short circuit portion is present in the electrolyte membrane based on the energization state of the plurality of limited ranges.

Abstract: A method of inspecting short circuit of an electrolyte membrane by a short circuit inspection apparatus includes an obtaining step of performing a process of obtaining the energization state of a limited range including divided portions that are adjacent to each other in a range which is smaller than the entire range of the plurality of divided portions, for each of a plurality of limited ranges provided at different positions, and a determination step of determining whether or not a short circuit portion is present in the electrolyte membrane based on the energization state of the plurality of limited ranges.

Abstract: A membrane thickness evaluation apparatus includes a first voltage application electrode and a second voltage application electrode. A membrane electrode assembly is interposed between the first voltage application electrode and a second voltage application electrode. Alternating current voltage is applied to the membrane electrode assembly to measure the impedance of an electrolyte membrane, and electrostatic capacitance is calculated from the impedance. The electrostatic capacitance is compared with the correlation with the membrane thickness to determine the membrane thickness of the electrolyte membrane.

Abstract: A membrane thickness evaluation apparatus includes a first voltage application electrode and a second voltage application electrode. A membrane electrode assembly is interposed between the first voltage application electrode and a second voltage application electrode. Alternating current voltage is applied to the membrane electrode assembly to measure the impedance of an electrolyte membrane, and electrostatic capacitance is calculated from the impedance. The electrostatic capacitance is compared with the correlation with the membrane thickness to determine the membrane thickness of the electrolyte membrane.