Design of a multispectral plenoptic camera and its application for pyrometry

Area of Science:

• Optical Engineering
• Spectroscopy
• Metrology

Background:

• Multispectral imaging offers advantages over traditional single-band methods.
• Plenoptic cameras provide unique capabilities for capturing light field information.
• Accurate temperature measurement is crucial in various scientific and industrial applications.

Purpose of the Study:

• To develop a robust multispectral imaging system for quantitative emission measurements.
• To enable non-contact temperature determination using pyrometry.
• To create a system independent of in situ calibration.

Main Methods:

• Modification of a plenoptic camera with a color filter array at the aperture plane.
• A priori characterization of all optical elements, including filters and camera sensor.
• Simultaneous acquisition of spectral emission data across seven discrete bands.

Main Results:

• The developed system quantitatively images emission in seven spectral bands.
• Pyrometry measurements using the system achieved a mean temperature difference of 0.65°C from 600°C to 1000°C.
• Accurate temperature determination was demonstrated by fitting spectral emission to Planck's law.

Conclusions:

• The modified plenoptic camera system provides accurate, simultaneous multispectral imaging.
• The a priori characterization approach eliminates the need for in situ calibration.
• This system offers a reliable method for quantitative pyrometry and temperature measurement.