Howtosignalprocessing
How do you calculate Strehl ratio?
The Strehl ratio is a measure of the quality of optical image formation. The Strehl ratio equals the exponential of -4\[Pi] squared times the root mean square deviation of the wavefront squared divided by the wavelength squared.
What is a good Strehl ratio?
When designing an optical system, the Strehl ratio is used to estimate the required correction of wavefront aberrations. The acceptable level of wavefront aberrations is different for every application but a value of 0.80 Strehl is conventionally used to define an optical system as “Diffraction limited” or ideal.
What is PV and RMS?
Peak-to-Valley (PV) and Root-Mean-Square (RMS) are two common parameters used to measure the difference between an ideal optic surface to the actual optic surface. Historically the PV is used more often than RMS but RMS is a much better method for measuring the feat of an optic.
