Thermal images of small agricultural seeds obtained by photoacoustic and photopyroelectric microscopies

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Abstract

Photoacoustic (PA) and photopyroelectric microscopies were used to obtain photothermal images of small agricultural seeds. In the photoacoustic microscopy (PAM) technique, a tightly closed PA cell was used with an electret microphone as the sensor. In photopyroelectric microscopy (PPEM), the seeds were placed in contact with a pyroelectric (PE) sensor. From the experimental data, it was possible to obtain thermal images of the scanned samples from the amplitude and phase signals. In the present research, thermal images of small agricultural seeds were obtained by both techniques and compared. The experimental results show that the photothermal images obtained by PAM have better resolution than those obtained by PPEM. PAM images using the amplitude signal appear to be more sensitive to detect seed structures as was observed in the seed thermal images obtained in this study.

Original languageEnglish
Pages (from-to)972-978
Number of pages7
JournalInternational Journal of Thermophysics
Volume34
Issue number5
DOIs
StatePublished - May 2013

Keywords

  • Agricultural
  • Photoacoustic microscopy
  • Photopyroelectric microscopy
  • Thermal image

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