OPTICAL AND ELECTRICAL PROPERTIES FOR DETERMINING HARVEST TIME OF BEAN AND PEA PODS

Document Type : Original Article

Authors

1 Prof. Dr., Agric. Eng. Dep., Fac. of Ageic., Cairo Univ., Egypt.

2 Prof. Dr., Nat. Inst. of Laser Enhanced Sc., Cairo Univ., Egypt.

3 Assoc. Prof., Nat. Inst. of Laser Enhanced Sc., Cairo Univ., Egypt.

4 Res., Agric. Eng. Res. Inst, Agric. Res Center, Dokki, Egypt.

Abstract

The main objectives of this research are to use  visible laser to determine
the optimal harvest time of green beans (Phaseolus vulgaris L. var Paulista) and Sweet peas (Pisum Sativum L. var Sugar Lays) with its optical and electrical properties at different ages. Obtained results are summarized as follows: 1) The values of light reflection intensity increased by using He-Ne laser (632.8 nm) for ages of green bean and green peas, meanwhile these values decreased by using He-Ne laser (543.5nm); 2) The values of electrical signals were increased by using He-Ne laser (632.8 nm) and decreased by using He-Ne laser (543.5 nm) for ages of green pean and pea pods.; and 3) There were relationships between intensity of light and electrical  reflections by using two He-Ne laser  as a function of the green beans and pea pods age. The He-Ne laser with wavelength 632.8 nm was suitable high reflection from green bean and sweet pea pods at ages (maturity stages) about 22 and 18 days, respectively (optimal harvest time) from the appearance of the flower pods.

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References

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Misr Journal of Agricultural Engineering
Volume 29, Issue 1
January 2012
Pages 321-340

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