CFST arch bridge void infrared detection and quantification method based on cold excitation

The invention discloses a CFST arch bridge void infrared detection and quantification method based on cold excitation, and belongs to the technical field of concrete filled steel tube bridge detection. Comprising the following steps: shooting infrared temperature images of a concrete filled steel tube test area before and after controllable cooling excitation; the method comprises the following steps: performing regularization processing on an image, calculating the real area of a single pixel after regularization, performing primary cutting and secondary cutting on the regularized image, and extracting a temperature matrix before and after cooling excitation through the cut infrared image to obtain a temperature difference matrix; and calculating the average value and the standard deviation of the temperature difference matrix, and calculating the void threshold through the average value and the standard deviation. And performing void judgment on the infrared image by using the void threshold and counting th