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In Situ Surface Temperature Measurement in a Conveyor Belt Furnace via Inline Infrared Thermography

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Athermal glass for the infrared.

S Mitachi, P A Tick

|June 29, 2010

Summary

This study measured refractive indices for CLAP glass systems. Results show low temperature coefficients, suggesting suitability for athermal infrared applications.

Area of Science:

Materials Science
Optical Engineering
Solid State Physics

Background:

Optical materials are crucial for infrared (IR) technologies.
Understanding temperature-dependent optical properties is essential for device stability.
Chalcogenide-Lanthanide-Alkali-Phosphosilicate (CLAP) glasses are investigated for optical applications.

Purpose of the Study:

To measure the refractive indices of four CLAP glass systems.
To determine the temperature coefficients of optical path lengths.
To evaluate the potential of CLAP glasses for athermal applications in the IR region.

Main Methods:

Refractive index measurements were conducted at room and elevated temperatures.
The wavelength range for measurements was 0.4 to 5.5 micrometers.

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Optical path length temperature coefficients were calculated from the refractive index data.

Main Results:

Refractive indices were successfully measured across the specified wavelength range.
Temperature coefficients of optical path lengths were found to be less than 1 x 10(-6)/°C for wavelengths > 1 micrometer.
This indicates minimal change in optical path length with temperature variations.

Conclusions:

CLAP glass systems exhibit low temperature-dependent optical path length changes.
These properties make CLAP glasses promising candidates for athermal applications.
Specifically, their suitability for the infrared ray region is highlighted.