Gas flow rate estimation device, gas flow rate estimation method, non-transitory computer-readable storage medium storing gas flow rate estimation program, leakage gasdetection device, leakage gas detection method, and detection data processing device

A gas flow rate estimation method comprising:

• acquiring map information around a camera capturing an infrared image of a gas cloud from position information of the camera;
• calculating a distance from the camera to the gas cloud based on the map information;
• calculating, by using time-series images of the gas cloud captured by the camera, a gas velocity of the gas cloud and a gas passage time for which gas passes through a gas region extracted from the time-series images;
• calculating a gas concentration thickness product of the gas region by using image data of the gas region included in the infrared image and a gas amount of the gas region by using the gas concentration thickness product and a distance to the gas cloud;
• and
• calculating a flow rate estimation value of gas by using the gas passage time and the gas amount.

A non-transitory computer-readable storage medium storing a program causing a computer to perform:

• acquiring map information around a camera capturing an infrared image of a gas cloud from position information of the camera;
• calculating a distance from the camera to the gas cloud based on the map information;
• calculating, by using time-series images of the gas cloud captured by the camera, a gas velocity of the gas cloud and a gas passage time for which gas passes through a gas region extracted from the time-series images;
• calculating a gas concentration thickness product of the gas region by using image data of the gas region included in the time-series images and a gas amount of the gas region by using the gas concentration thickness product and a distance to the gas cloud;
• and
• calculating a flow rate estimation value of gas by using the gas passage time and the gas amount.