Diffraction losses associated with tungsten lamps in in absolute radiometry

Area of Science:

• Optical Physics
• Metrology

Background:

• Absolute radiometers are crucial for accurate light measurements.
• Diffraction effects can introduce errors in radiometer readings.
• Understanding these losses is key to improving measurement precision.

Purpose of the Study:

• To calculate diffraction losses in absolute radiometers.
• To assess the accuracy of Blevin's treatment for typical configurations.
• To evaluate losses across a range of color temperatures and filters.

Main Methods:

• Calculated diffraction losses using Blevin's treatment.
• Modeled a point source and single diffracting aperture.
• Applied calculations to absolute radiometer configurations.

Main Results:

• Blevin's treatment provides sufficient accuracy for typical absolute radiometers.
• Quantified diffraction losses for tungsten lamps with specific filters.
• Results obtained for color temperatures from 1600-3200 K.

Conclusions:

• Blevin's method is validated for absolute radiometer diffraction loss calculations.
• The study provides essential data for precise optical radiation measurements.
• Findings are applicable to radiometers using tungsten lamps and glass filters.