Abstract: An analysis system for quantitative blockage analysis of a grid in icing conditions includes an optical sensor, a processor unit and a display unit. The optical sensor is configured to continuously capture a series of pictures of a grid and to submit each picture to the processor unit. The processor unit is configured to determine a color scale value for each of a number of areas in a field of each picture, to count a number of areas in a particular field of a particular picture that show a color scale value greater than an absolute reference value, to calculate a time remaining until a critical icing condition is reached based on an icing behavior model of the grid, to calculate a warning signal based on the time remaining until the critical icing condition of the grid is reached, and to display the warning signal on the display unit.