Multi-color pulse-amplitude modulated handheld fluorescence imager

Abstract

A portable device operable to identify photosynthetic activity and contents of compounds in a plant part. The portable device includes a light source including light-emitting diodes operable to irradiate the plant part with light. The portable device further includes a control module operable to have the light-emitting diodes emit the light as pulse signals. Additionally, the portable device includes a focus-adjustable lens and a filter optically coupled to the light source, where the adjustable lens and the filter are co-operable to consolidate light reflected from the plant part which may be irradiated by light from the light-emitting diodes. Furthermore, the portable device includes a detector optically positioned to receive from the focus-adjustable lens and the filter the light reflected from the plant part, where the light reflected from the plant part corresponds to the photosynthetic activity and contents of compounds in the plant part.