Automation of a laser absorption calorimeter

Area of Science:

• Materials Science
• Optical Physics
• Analytical Chemistry

Background:

• Laser calorimetry is a mature technique for measuring small absorption coefficients.
• The availability of high-power lasers at various wavelengths makes calorimetry a valuable extension of spectroscopy.
• Automating calorimetric measurements is desirable for increased efficiency and throughput.

Purpose of the Study:

• To describe an automated calorimeter developed at Honeywell.
• To enable efficient measurement of absorption coefficients in bulk samples and thin films.
• To facilitate the examination of numerous samples and the impact of processing on absorption.

Main Methods:

• Development of an automated laser calorimeter system.
• Implementation of computer control for experimental procedures.
• Capability for measurements on both bulk materials and thin films on substrates.

Main Results:

• The automated calorimeter allows for the examination of a large number of samples.
• The system can determine the effects of various processing steps on bulk absorption.
• Accurate measurements of small absorption coefficients are achievable.

Conclusions:

• Automated laser calorimetry enhances the efficiency and scope of absorption coefficient measurements.
• The developed system provides a powerful tool for materials characterization.
• This automation extends the utility of calorimetry as a spectroscopic technique.