How to use the michelson interferometer fringe count calculator
Count the interference fringes that pass when one mirror of an interferometer moves a given distance. Enter mirror displacement, wavelength in the fields above; the fringes counted is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “Michelson interferometer fringes”, “fringe shift”, “mirror displacement fringes”, “calculate michelson interferometer fringe count”, “find fringes counted”.
Formula
Variables
- d — Mirror displacement (µm)
- lam — Wavelength (nm)
Worked example
With mirror displacement = 10 µm, wavelength = 633 nm, the calculator gives fringes counted ≈ 31.59558 fringes.
Frequently asked questions
What is the michelson interferometer fringe count calculator used for?
Count the interference fringes that pass when one mirror of an interferometer moves a given distance. It helps with questions such as “Michelson interferometer fringes”, “fringe shift”, “mirror displacement fringes”.
What is the formula for the michelson interferometer fringe count calculation?
Fringes counted (fringes) = 2 × d × 1e-6 / (lam × 1e-9). Here d is mirror displacement (µm), lam is wavelength (nm).
What inputs do I need for the michelson interferometer fringe count calculator?
You need mirror displacement in µm, wavelength in nm. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the michelson interferometer fringe count calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the michelson interferometer fringe count result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.