photobiologyFilters (version 0.6.0)

water_n: Refractive index of water

Description

The refractive index, usually abbreviated as \(n\) varies with temperature and wavelength.

Usage

water_n(temperature = 20, w.length = 540, type = "freshwater")

Arguments

temperature

numeric Water temperature in degrees Celcius (C)

w.length

numeric Wavelength in nanometres (nm)

type

character One of "freshwater" or "seawater".

Details

Function `n.water()` implements the function proposed by Parrish for approximation of \(n\) for freshwater and seawater. The function is valid for wavelengths from 400 nm to 700 nm, and for temperatures from 0 C to 30 C. The function is vectorized.

References

Chris Parrish (2020) Index of Refraction of Seawater and Freshwater as a Function of Wavelength and Temperature. https://research.engr.oregonstate.edu/parrish/index-refraction-seawater-and-freshwater-function-wavelength-and-temperature

See Also

For other materials see refractive_index.mspct and to compute reflectance from \(n\) see Rfr_from_n.

Examples

water_n(w.length = (40:70)*10)
water_n(temperature = seq(0, 30, by = 5))