Synthetic Wavelength
Calculate the two-color synthetic wavelength for interferometric unwrapping.
Description
A two-color synthetic wavelength describes the larger period formed by wavelength beating.
A two-color synthetic wavelength describes the larger period formed by wavelength beating. It depends strongly on the separation of the two wavelengths.1
Calculate the two-color synthetic wavelength for interferometric unwrapping.
When to use Synthetic Wavelength
Use this tool to calculate the two-color synthetic wavelength for interferometric unwrapping.
Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
How to use Synthetic Wavelength and understand its results
- Prepare the optical measurements, geometry, fitted coefficients or caller-selected thresholds requested. Confirm wavelength, radius/diameter, pulse-width, angle and unit conventions before running the calculation.
- Enter firstWavelengthMeters, secondWavelengthMeters using the field table and calculation rules, then run the tool.
- Read syntheticWavelengthMeters. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| firstWavelengthMeters | First wavelength (m) | number; minimum: 0 | Required |
| secondWavelengthMeters | Second wavelength (m) | number; minimum: 0 | Required |
Enter nonnegative unequal wavelengths in meters. Return the synthetic wavelength; a zero wavelength is accepted and yields zero.
syntheticλ=λ1λ2/|λ1−λ2| Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| syntheticWavelengthMeters | Synthetic wavelength (m) | number; minimum: 0 |
{
"input": {
"firstWavelengthMeters": 0.000001,
"secondWavelengthMeters": 0.00000101
},
"output": {
"syntheticWavelengthMeters": 0.00010099999999999882
}
}Limitations and assumptions
No phase unwrapping or measurement uncertainty is evaluated. Physical optical wavelengths should be positive.
Numeric inputs must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Missing required fields, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use Swept-Frequency Distance: Convert swept-frequency phase slope to delay and one-way distance. For a complementary task, use Comb-Ranging Ambiguity: Calculate one-way frequency-comb ranging ambiguity distance.
References
-
Synthetic Wavelength — tool.io
Similar or alternative tools
- Swept-Frequency Distance
Convert swept-frequency phase slope to delay and one-way distance.
- Comb-Ranging Ambiguity
Calculate one-way frequency-comb ranging ambiguity distance.