Chris Toomey and Damon Diehl

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Four Considerations When Using RMS and Peak-to-Valley Specifications

By Chris Toomey and Damon Diehl | Mar 13, 2019 10:37:44 AM

A frequent question posed to optical suppliers and manufacturers is: “What is the difference between Root Mean Square (RMS) and Peak-to-Valley (P-V)?” RMS and P-V are both methods for describing how well the shape of an object matches its designed curvature, called “surface figure" and "surface roughness," respectively.  An understanding of RMS and P-V is critical in order to prevent over- or under-specifying the parts of an optical system.

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