# Thermal emission from a single glass fiber

## TL;DR

This study investigates the thermal emission spectra of individual industrial glass fibers, comparing experimental measurements with theoretical models to understand their emission properties for insulation applications.

## Contribution

It provides the first detailed comparison of measured thermal emission spectra of single glass fibers with Mie theory calculations, validating the theoretical approach.

## Key findings

- Excellent qualitative agreement between measured and theoretical spectra
- Thermal emission spectra depend on fiber diameter and material permittivity
- Infrared spatial modulation spectroscopy effectively characterizes fiber emission

## Abstract

In this article, we study the thermal light emission from individual fibers of an industrial glass material, which are elementary building blocks of glass wool boards used for thermal insulation. Thermal emission spectra of single fibers of various diameters partially suspended on air are measured in the far-field by means of infrared spatial modulation spectroscopy.These experimental spectra are compared with the theoretical absorption efficiency spectra of cylindrical shaped fibers calculated analytically in the framework of Mie theory taking as an input the measured permittivity of the industrial glass material. An excellent qualitative agreement is found between the measured thermal radiation spectra and the theoretical absorption efficiency spectra.