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A Novel Microsensor for Measuring Angular Distribution of Radiative Intensity.

Thomas E Murphy¹, Stuart Pilorz², Leslie Prufert-Bebout¹

¹NASA Ames Research Center, Moffett Field, CA.

Photochemistry and Photobiology

|March 13, 2015

Summary

This summary is machine-generated.

Researchers developed a novel differential acceptance angle (DAA) probe to measure light field directionality in challenging environments. This new light probe offers a significant advantage for studying light transfer physics in microbial communities.

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An Intra-Tissue Radiometry Microprobe for Measuring Radiance In Situ in Living Tissue

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Area of Science:

Optics
Microbiology
Radiative Transfer Physics

Background:

Measuring light field directionality is crucial for understanding light transfer in complex environments like microbial mats.
Existing methods often require probe removal and reorientation, disrupting delicate ecosystems and introducing errors.
Steep light gradients in environments such as microbial mats pose significant challenges for accurate light measurements.

Purpose of the Study:

To design, construct, and characterize a novel light probe for measuring angular radiance distribution.
To develop a method that resolves light field directionality without probe manipulation in situ.
To provide a tool for advancing the understanding of light transfer in dense microbial communities.

Main Methods:

The differential acceptance angle (DAA) probe utilizes an inner irradiance sensor within a movable, light-absorbing sheath.
Radiative intensity is calculated by comparing sensor irradiance at varying acceptance angles.
The probe's performance was validated against a conventional radiance probe.

Main Results:

The DAA probe successfully measured angular radiance distribution in sample light fields.
Measurements showed good agreement with a conventional radiance probe, validating the DAA probe's accuracy.
The probe effectively resolved light directionality even in environments with steep light gradients.

Conclusions:

The novel DAA probe offers a non-disruptive method for measuring light field directionality in situ.
This technology will enhance the study of light transfer physics within microbial communities.
The DAA probe facilitates the validation of numerical radiative transfer models for complex environments.