Red/near-infrared reflectance sensor system for detecting plants

Kenneth Von Bargen, George E. Meyer, David Mortensen, Steven J. Merritt, David M. Woebbecke

Research output: Chapter in Book/Report/Conference proceedingConference contribution

9 Citations (Scopus)

Abstract

Growing plants, soil types, and surfaces and residues on a soil surface have distinct natural light reflectances. These reflectance characteristics have been determined using current spectroradiometry technology. Detection of plants is possible based upon the distinct reflectance characteristics of plants, soil, and residues. An optical plant reflectance sensor was developed which utilizes a pair of red and near infrared sensitive photodetectors to measure the radiancy from the plant and soil. Another pair of sensors measures radiancy from a highly radiant reference surface to accommodate varying intensities of the natural light. The ratio of the target and reference radiancies is the target reflectance. Optical filters were used to select the spectral bandwidth sensitivities for the red and NIR photodetectors. The reflectance values were digitized for incorporation into a normalized difference index in order to provide a stronger indication that a live plant is present within the field of view of the sensor. This sensor system was combined with a microcontroller for activating a solenoid controlled spray nozzle on a single unit prototype spot agricultural sprayer.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsJames A. DeShazer, George E. Meyer, Boris F. Fyodorov
PublisherPubl by Int Soc for Optical Engineering
Pages231-238
Number of pages8
Volume1836
ISBN (Print)0819410373
StatePublished - 1993
EventOptics in Agriculture and Forestry - Boston, MA, USA
Duration: Nov 16 1992Nov 17 1992

Other

OtherOptics in Agriculture and Forestry
CityBoston, MA, USA
Period11/16/9211/17/92

Fingerprint

radiancy
Infrared radiation
reflectance
sensors
soils
Sensors
Soils
Photodetectors
photometers
spray nozzles
Spray nozzles
Optical filters
Solenoids
optical filters
Microcontrollers
solenoids
field of view
sprayers
indication
prototypes

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering
  • Condensed Matter Physics

Cite this

Von Bargen, K., Meyer, G. E., Mortensen, D., Merritt, S. J., & Woebbecke, D. M. (1993). Red/near-infrared reflectance sensor system for detecting plants. In J. A. DeShazer, G. E. Meyer, & B. F. Fyodorov (Eds.), Proceedings of SPIE - The International Society for Optical Engineering (Vol. 1836, pp. 231-238). Publ by Int Soc for Optical Engineering.
Von Bargen, Kenneth ; Meyer, George E. ; Mortensen, David ; Merritt, Steven J. ; Woebbecke, David M. / Red/near-infrared reflectance sensor system for detecting plants. Proceedings of SPIE - The International Society for Optical Engineering. editor / James A. DeShazer ; George E. Meyer ; Boris F. Fyodorov. Vol. 1836 Publ by Int Soc for Optical Engineering, 1993. pp. 231-238
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Von Bargen, K, Meyer, GE, Mortensen, D, Merritt, SJ & Woebbecke, DM 1993, Red/near-infrared reflectance sensor system for detecting plants. in JA DeShazer, GE Meyer & BF Fyodorov (eds), Proceedings of SPIE - The International Society for Optical Engineering. vol. 1836, Publ by Int Soc for Optical Engineering, pp. 231-238, Optics in Agriculture and Forestry, Boston, MA, USA, 11/16/92.

Red/near-infrared reflectance sensor system for detecting plants. / Von Bargen, Kenneth; Meyer, George E.; Mortensen, David; Merritt, Steven J.; Woebbecke, David M.

Proceedings of SPIE - The International Society for Optical Engineering. ed. / James A. DeShazer; George E. Meyer; Boris F. Fyodorov. Vol. 1836 Publ by Int Soc for Optical Engineering, 1993. p. 231-238.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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Von Bargen K, Meyer GE, Mortensen D, Merritt SJ, Woebbecke DM. Red/near-infrared reflectance sensor system for detecting plants. In DeShazer JA, Meyer GE, Fyodorov BF, editors, Proceedings of SPIE - The International Society for Optical Engineering. Vol. 1836. Publ by Int Soc for Optical Engineering. 1993. p. 231-238