Abstract

We present a novel design for an optoelectronics- based real-time plant discrimination sensor, which enables a high signal-to-noise ratio, and hence a low false positive rate, to be attained. The sensor employs graded thin film coatings and a high-speed photodetector array in conjunction with a solar spectral filter and 3-wavelength sequentially driven laser module to generate multiple uniformly distributed laser spots of uniform optical power distribution. Plant discrimination is achieved through the measurements of the slope of the spectral response at discrete wavelengths as well as the Normalised Difference Vegetation Index (NDVI). The maximisation of the optical signal to noise ratio achieved by employing a custom designed optical band-pass filter minimises the daylight background noise saturating the photodetectors, thus enabling plant identification to be carried out with a background light intensity as high as 10,000 lux without implementing any shade construction.

© 2013 IEEE

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References

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  1. R. B. Brown, S. D. Noble, "Site-specific weed management: Sensing requirements โ€“ What do we need to see," Weed Sci. 53, 252-258 (2005).
  2. J. Sinden, R. Jones, R. Hester, D. Odom, C. Kalisch, R. James, O. Cacho, The Economic Impact of Weeds in Australia CRC for Australian Weed Management (2004) Technical Series # 8.
  3. S. G. Raymond, P. J. Hilton, R. P. Gabric, "Intelligent crop spraying: A prototype development," Proc. 1st Int. Conf. Sensing Technol. (2005) pp. 488-493.
  4. K. Sahba, S. Askraba, K. E. Alameh, "Non-contact laser spectroscopy for plant discrimination in terrestrial crop spraying," Opt. Exp. 14, 12485-12493 (2006).
  5. A. Paap, S. Askraba, K. Alameh, J. Rowe, "Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination," Opt. Exp. 16, 1051-1055 (2009).
  6. R. Zwiggelaar, "A review of spectral properties of plants and their potential use for crop/weed discrimination in row row-crops," Crop Protection 17, 189-206 (1998).
  7. P. S. Thenkabail, E. A. Enclona, M. S. Ashton, B. Van der Meer, "Accuracy assessments of hyperspectral waveband performance for vegetation analysis applications," Remote. Sens. Environ. 91, 354-376 (2004).
  8. J. D. Mauseth, Botany: An Introduction to Plant Biology (Jones and Bartlett Publishers, 2003).
  9. E. Hecht, Optics (Addison-Wesley, 1987).

2009 (1)

A. Paap, S. Askraba, K. Alameh, J. Rowe, "Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination," Opt. Exp. 16, 1051-1055 (2009).

2006 (1)

K. Sahba, S. Askraba, K. E. Alameh, "Non-contact laser spectroscopy for plant discrimination in terrestrial crop spraying," Opt. Exp. 14, 12485-12493 (2006).

2005 (1)

R. B. Brown, S. D. Noble, "Site-specific weed management: Sensing requirements โ€“ What do we need to see," Weed Sci. 53, 252-258 (2005).

2004 (1)

P. S. Thenkabail, E. A. Enclona, M. S. Ashton, B. Van der Meer, "Accuracy assessments of hyperspectral waveband performance for vegetation analysis applications," Remote. Sens. Environ. 91, 354-376 (2004).

1998 (1)

R. Zwiggelaar, "A review of spectral properties of plants and their potential use for crop/weed discrimination in row row-crops," Crop Protection 17, 189-206 (1998).

Crop Protection (1)

R. Zwiggelaar, "A review of spectral properties of plants and their potential use for crop/weed discrimination in row row-crops," Crop Protection 17, 189-206 (1998).

Opt. Exp. (1)

K. Sahba, S. Askraba, K. E. Alameh, "Non-contact laser spectroscopy for plant discrimination in terrestrial crop spraying," Opt. Exp. 14, 12485-12493 (2006).

Opt. Exp. (1)

A. Paap, S. Askraba, K. Alameh, J. Rowe, "Photonic-based spectral reflectance sensor for ground-based plant detection and weed discrimination," Opt. Exp. 16, 1051-1055 (2009).

Remote. Sens. Environ. (1)

P. S. Thenkabail, E. A. Enclona, M. S. Ashton, B. Van der Meer, "Accuracy assessments of hyperspectral waveband performance for vegetation analysis applications," Remote. Sens. Environ. 91, 354-376 (2004).

Weed Sci. (1)

R. B. Brown, S. D. Noble, "Site-specific weed management: Sensing requirements โ€“ What do we need to see," Weed Sci. 53, 252-258 (2005).

Other (4)

J. Sinden, R. Jones, R. Hester, D. Odom, C. Kalisch, R. James, O. Cacho, The Economic Impact of Weeds in Australia CRC for Australian Weed Management (2004) Technical Series # 8.

S. G. Raymond, P. J. Hilton, R. P. Gabric, "Intelligent crop spraying: A prototype development," Proc. 1st Int. Conf. Sensing Technol. (2005) pp. 488-493.

J. D. Mauseth, Botany: An Introduction to Plant Biology (Jones and Bartlett Publishers, 2003).

E. Hecht, Optics (Addison-Wesley, 1987).

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