Hybrid spatial-temporal Mueller matrix imaging spectropolarimeter for high throughput plant phenotyping.

Area of Science:

• Plant science
• Spectropolarimetry
• Agricultural technology

Background:

• Plant spectral properties correlate with phenotypic traits.
• Understanding metabolic, environmental, and genotypic differences in plants is crucial.
• Polarimetric components offer a potential avenue for plant analysis.

Purpose of the Study:

• To develop and validate a portable Mueller matrix imaging spectropolarimeter for field use.
• To investigate correlations between plant polarimetric components and plant characteristics.
• To establish baseline polarimetric data for Zea mays hybrids.

Main Methods:

• Designed a portable Mueller matrix imaging spectropolarimeter combining temporal and spatial modulation.
• Optimized the system for minimized measurement time and maximized signal-to-noise ratio.
• Calibrated the instrument and validated its performance across the 405-730 nm spectral range.

Main Results:

• The spectropolarimeter achieved average absolute errors of (5.3±2.2)×10⁻³ and (7.1±3.1)×10⁻³ in validation tests.
• Preliminary field data established baselines for barren and non-barren Zea mays hybrids.
• Subtle variations in retardance and diattenuation were detected across leaf and canopy positions.

Conclusions:

• The portable spectropolarimeter is effective for field measurements of plant polarimetric properties.
• Polarimetric imaging can detect subtle plant variations not yet visible in spectral transmission.
• This technology has potential for non-invasive assessment of plant health and genotypic differences.