Chlorophyll plays an important role in the detection of higher plants and all other plants that can carry out photosynthesis. When using SPAD chlorophyll meter to measure the chlorophyll content of crops

the difference of leaf thickness will affect the measurement results. In order to accurately measure the chlorophyll content of plants

the leaf thickness measurement module should be added to compensate while using the SPAD chlorophyll meter. For this reason

thickness parameter is introduced to rebuild the mathematical model for chlorophyll content

and thickness compensation chlorophyll meter is developed. The results show that the thickness calibration model can more accurately reflect the chlorophyll content.