Abstract: A leaked gas detection device and a leaked gas detection method according to the present invention obtain a leakage position of a gas leaked into a space on the basis of an image of a target area, obtain a reliability degree that is an index representing the degree of reliability with respect to the obtained leakage position on the basis of data of a meteorological element, and display the obtained leakage position on a display unit in a range including the leakage position. At this time, the leaked gas detection device and the leaked gas detection method according to the present invention change a size of the range according to the obtained reliability degree.

Abstract: In a leaked gas detection device and a leaked gas detection method according to the present invention, a gas cloud image area of a gas cloud formed with a leaked gas is extracted on the basis of an infrared image of a target area, a gas temperature of the gas cloud is acquired, a concentration-thickness product of the gas cloud is obtained, and a reliability degree that is an index representing the degree of reliability with respect to the obtained concentration-thickness product of the gas cloud is obtained on the basis of a background temperature in the gas cloud image area and the gas temperature of the gas cloud.

Abstract: In a leaked gas detection device and a leaked gas detection method according to the present invention, a gas cloud image area of a gas cloud formed with a leaked gas is extracted on the basis of an infrared image of a target area, a gas temperature of the gas cloud is acquired, a concentration-thickness product of the gas cloud is obtained, and a reliability degree that is an index representing the degree of reliability with respect to the obtained concentration-thickness product of the gas cloud is obtained on the basis of a background temperature in the gas cloud image area and the gas temperature of the gas cloud.

Abstract: A leaked gas detection device and a leaked gas detection method according to the present invention obtain a leakage position of a gas leaked into a space on the basis of an image of a target area, obtain a reliability degree that is an index representing the degree of reliability with respect to the obtained leakage position on the basis of data of a meteorological element, and display the obtained leakage position on a display unit in a range including the leakage position. At this time, the leaked gas detection device and the leaked gas detection method according to the present invention change a size of the range according to the obtained reliability degree.

Abstract: A pulley belt installer has a pulley holder (6) for holding one pulley (2) of a pair of pulleys, a held pulley width expander (5) for expanding the groove width of the pulley held by the pulley holder, a pulley belt holder (8) for holding a pulley belt in the condition in which part of the pulley belt (PB) is located in the groove of the pulley held by the pulley holder, and a pulley rotator (16) for rotating the other pulley (1) at least 90 degrees in the condition in which another part of the held pulley belt is located in the groove of the other pulley, so that the center axes of both pulleys about a rotation axis intersecting with the center axis of the other pulley are parallel, thereby assembly the pulley belt without causing overlap between the surfaces of the two V-grooves of the pair of pulleys.