Multispectral video camera optical system

Subject of study. This study investigated a method for designing an optoelectronic system providing simultaneous capture of a single broadband and 15 narrowband spectral images. Aim of study. This study aimed to develop and test a multispectral video camera based on a lens optical system that forms images on a single radiation detector array in the ultraviolet, visible, and near-infrared ranges of the spectrum and has a sufficiently wide field of view and aperture. Method. The proposed solution is based on two configurations of optical systems that correspond to a front aperture stop inverse telephoto lens layout, independently optimized for the ultraviolet and visible/near-infrared channels. The described methodology of lens design makes it possible to provide minimal transverse dimensions, equality of spectral image scales, and the possibility of focusing each lens independently. Main results. The developed multispectral optoelectronic system allows synchronous registration of 16 images: 1 broadband and 15 spectral images in the range of 300–1000 nm with equal 50 nm spacing and 10 nm width of spectral channels. The article presents simulation results, data for aberration analysis, and test images obtained in all 16 channels and demonstrates their high quality. Approbation of the developed lens system was carried out as part of a prototype of a multispectral video camera. The images of a plant sample were registered, and the results of their processing were used to obtain the spectral dependence of the reflection coefficient corresponding to the typical reflection spectrum of plant leaves. Practical significance. The proposed multispectral optoelectronic system provides high quality images in each spectral channel and allows easy channel replacement and tuning to solve the problem of productive collection of spatial-spectral data in precision agriculture, eco-monitoring, medicine, and nondestructive testing.