Gas concentration measuring device, gas concentration measuring method, and program

A gas concentration measuring device that measures a distribution of a gas concentration in a space as a monitoring target, the gas concentration measuring device comprising:

• an inspection image acquisitor that acquires infrared image time-series data in which infrared images captured by an infrared camera at a plurality of times and capturing the space constituted by a plurality of pixels are arranged in time series;
• a pixel specifier that specifies a target pixel for gas concentration measurement and a reference pixel with a gas concentration lower than a gas concentration of the target pixel in the infrared image;
• and
• a concentration-feature-quantity calculator that calculates a feature quantity related to a gas concentration of the target pixel based on target pixel temperature information including a temperature change of target pixel time-series infrared data in which infrared data of the target pixel is arranged in time series and reference pixel temperature information including a temperature change of reference pixel time-series infrared data in which infrared data of the reference pixel is arranged in time series in time-series data of the infrared image.

A gas concentration measuring method of measuring a distribution of a gas concentration in a space as a monitoring target, the gas concentration measuring method comprising:

• acquiring infrared image time-series data in which infrared images captured by an infrared camera at a plurality of times and capturing the space constituted by a plurality of pixels are arranged in time series;
• specifying a target pixel for gas concentration measurement and a reference pixel with a gas concentration lower than a gas concentration of the target pixel in the infrared image;
• estimating without-gas background temperature time-series infrared data in the target pixel based on target pixel time-series infrared data in which infrared data of the target pixel is arranged in time series and reference pixel time-series infrared data in which infrared data of the reference pixel is arranged in time series in time-series data of the infrared image;
• and
• calculating time-series data of a feature quantity related to a gas concentration of the target pixel based on target pixel time-series infrared data and without-gas background temperature time-series infrared data of the target pixel.

A non-transitory recording medium storing a computer readable program that causes a computer to perform gas concentration measuring processing of measuring a distribution of a gas concentration in a space as a monitoring target, wherein

• the gas concentration measuring processing includes
• acquiring infrared image time-series data in which infrared images captured by an infrared camera at a plurality of times and capturing the space constituted by a plurality of pixels are arranged in time series,
• specifying a target pixel for gas concentration measurement and a reference pixel with a gas concentration lower than a gas concentration of the target pixel in the infrared image,
• estimating without-gas background temperature time-series infrared data in the target pixel based on target pixel time-series infrared data in which infrared data of the target pixel is arranged in time series and reference pixel time-series infrared data in which infrared data of the reference pixel is arranged in time series in time-series data of the infrared image, and
• calculating time-series data of a feature quantity related to a gas concentration of the target pixel based on target pixel time-series infrared data and without-gas background temperature time-series infrared data of the target pixel.