Prof. Hiroki Gonome Profile

Prof. Hiroki Gonome

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Proceedings Article | 20 February 2020 Paper

Laser biospeckle metrology in investigating plant-sound interactions

Minoru Hirai, Daiki Endo, Hiroki Gonome, Takahiro Kono, Jun Yamada, Uma Maheswari Rajagopalan

Proceedings Volume 11238, 1123813 (2020) https://doi.org/10.1117/12.2543663

KEYWORDS: Laser metrology, Metrology, Light scattering, Laser applications, Biological research, Light, Tissues, Humidity, Carbon dioxide, Laser scattering

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In recent years, it has been found that sound also has effect on plant growth and its yield with certain sound directing the seedling of corn toward the sound source and its ability in distinguishing stuttering of larvae from other sounds. However, methods investigating the effects of sound either take a long time or destructive. Here, we have used laser biospeckle, a non-destructive and non-contact technique to investigate the activities of an arugula plant (2-4 weeks old) under sounds of different frequencies of 0 Hz or control, 100 Hz, 1 kHz, 10 kHz. Laser biospeckle has been proved to be valid for investigating the aging of fruits, believed to be due to the movement of water, organelles etc.. Biospeckle activities were recorded for 20 sec at 15 fps following exposure to sounds for 1min. The correlation parameter (r) of biospeckle activity was used to characterize the activity of the plant with r being 1 for highly active and 0 for reduced plant activity. Sound level of 100 dB was the same for all frequencies. There was a clear difference in r between the control and other frequencies and r was lower than that of control indicating a reduction in the activity. Moreover, r for 100 Hz was found to be closer to control while at higher frequencies, r was much lower indicating a dependence of the activity on the frequency.

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