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  ENGINEERING METROLOGY TOOLBOX  
 Refractive Index of Air Calculator 
 Based on Ciddor Equation 

Refractive Index of Air Calculator is a web-based tool for calculating the index of refraction of air and wavelength of light in air as a function of various input parameters, using the Ciddor Equation or a modified version of the Edlén Equation.

Index of Refraction of Air
Jack A. Stone and Jay H. Zimmerman

Vacuum Wavelength and Ambient Conditions
Based on Ciddor Equation

InputAmount
Vacuum Wavelength:
Air Temperature:
Atmospheric Pressure:
Air Humidity:
Carbon Dioxide Content:
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Web Site Home: Engineering Metrology Toolbox
Technical Inquiries: Ted Doiron, Group Leader
Dimensional Metrology
Semiconductor and Dimensional Metrology Division
Physical Measurement Laboratory
NIST, 100 Bureau Drive, Stop 8211, Gaithersburg, MD 20899-8211

The National Institute of Standards and Technology (NIST) is an agency of the U.S. Department of Commerce.
NIST / PML / Semiconductor and Dimensional Metrology Division

NIST Program Questions: Public Inquires Unit
(301) 975-NIST (6478) TTY (301) 975-8295
NIST, 100 Bureau Drive, Stop 3460, Gaithersburg, MD 20899-3460

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Date Created: Thursday, December 07, 2000
Last Updated: Wednesday, November 24, 2004
Technical Web Site Questions: Jay Zimmerman
Feedback and Comments: Webmaster