Abstract
A portable, near-infrared spectrophotometer was designed, fabricated, and performance tested. Significant features included a circular variable filter monochromator, a fiber optic coupling for sensing of remote samples, and a software algorithm which corrected the instrument readings to a zero baseline. The instrument had a sensing range of 1650 nm to 2650 nm, an optical bandwidth of under 55 nm, and could acquire a spectrum every 200 ms. The intended use of this device was for rapid estimation of soil organic matter as a control input for variable rate herbicide application.
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