Understanding coherence in radiometry and how it shapes measurements
This chapter introduces the core idea of partial coherence through the cross-spectral density function and shows how it helps describe radiation fields. It explains how this quantity relates to common radiometric measurements and how spectral radiance can be derived from it. Practical examples illustrate the effects of coherence on diffraction and imaging, including a detailed look at measuring the slit-scattering function of a monochromator and how near-axis illumination minimizes distortions.
In the book, you will also find:
- How cross-spectral density propagates along a beam and how this affects observable patterns.
- Connections between theoretical concepts and classical radiometric quantities like spectral radiance.
- Different models for coherence, including the Schell model and the quasihomogeneous model, with guidance on when each applies.
Ideal for readers of Self-Study Manual on Optical Radiation Measurements and for those seeking practical tools to handle coherence in radiometry and instrument design.