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Floral infrared emissivity estimates using simple tools.

Michael J M Harrap1, Sean A Rands2

  • 1University of Bristol, Life Sciences Building, Tyndall Ave, Bristol, BS8 1TQ, UK. m.j.m.harrap@gmail.com.

Plant Methods
|February 26, 2021
PubMed
Summary
This summary is machine-generated.

Floral emissivity, crucial for accurate thermal imaging, is high, near 1. This study provides simple methods to estimate floral emissivity, validating previous assumptions for plant research.

Keywords:
AngiospermsEmissivityFloral temperatureInfrared thermographyThermal imaging

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Area of Science:

  • Plant Biology
  • Thermal Imaging
  • Biophysics

Background:

  • Accurate floral temperature measurement is vital for plant biology research.
  • Thermography (thermal imaging) is increasingly used for floral temperature assessment.
  • Floral emissivity data is lacking, leading to reliance on vegetative tissue estimates.

Purpose of the Study:

  • To estimate floral emissivity using accessible methods.
  • To determine the accuracy of using vegetative emissivity estimates for flowers.
  • To provide a guide for researchers conducting floral thermography.

Main Methods:

  • Developed two protocols for floral emissivity estimation: thermocouple and water bath.
  • Measured thermal infrared radiation from flowers of known temperatures.
  • Validated protocols using known temperatures from thermocouples or water baths.

Main Results:

  • Floral emissivity is high, close to 1, particularly across petals.
  • The water bath protocol yielded more consistent and realistic estimates than the thermocouple method.
  • Observed minor variations in emissivity across species and flower locations, often due to protocol artifacts.

Conclusions:

  • Floral emissivity is consistently high across most flowers and species, especially on petals.
  • A recommended emissivity value near 0.98 is suitable for accurate floral thermography.
  • Previous use of vegetative emissivity estimates for floral studies is validated by these findings.