Proposal of leaf chlorophyll content and its a/ b ratio measurement method using a filter-free multiple wavelength sensor

Abstract

In this study, we proposed a miniaturized system that can detect chlorophyll content and its a/b ratio simultaneously to measure the health condition of plants. In order to solve the problems of general measurement systems such as large-scale equipment and fracture measurement, a filter-free multiple wavelength sensor was used to evaluate the current ratio due to wavelength changes. Current characteristics demonstrated that the sensor due to the chlorophyll a/b ratio and changes in their concentrations are proportional to the spectral characteristics. As a result of measuring the extracted chlorophyll of plants and leaves, the centroid wavelength value of the transmission spectrum showed linear data from the current ratio of the sensor. The proposed method enabled simultaneous measurement of the chlorophyll content and its a/b ratio of plants with a non-destructive and compact device and is expected to be applied to the agricultural field.