Laser biospeckle metrology in investigating plant-sound interactions

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

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


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.

Original languageEnglish
Title of host publicationOptical Interactions with Tissue and Cells XXXI
EditorsBennett L. Ibey, Norbert Linz
ISBN (Electronic)9781510632394
Publication statusPublished - 2020
EventOptical Interactions with Tissue and Cells XXXI 2020 - San Francisco, United States
Duration: 2020 Feb 12020 Feb 2

Publication series

NameProgress in Biomedical Optics and Imaging - Proceedings of SPIE
ISSN (Print)1605-7422


ConferenceOptical Interactions with Tissue and Cells XXXI 2020
Country/TerritoryUnited States
CitySan Francisco


  • Laser biospeckle
  • Non-contact technique
  • Plant activity
  • Sound vibration

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Atomic and Molecular Physics, and Optics
  • Radiology Nuclear Medicine and imaging


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