Navigation:  Optical functions > Spectra

Spectrum objects can compute the following quantities:

 

(simulated value at 540 nm): This function returns the value of the simulated spectrum at 540 nm.

 

(measured value at 540 nm): This function returns the value of the measured spectrum at 540 nm.

 

(measured average 2000 3000 50): This function returns the average of the measured spectrum between the spectral positions 2000 and 3000 (nm, eV, 1/cm or whatever spectral unit the object has at the moment), computed using 50 points.

 

(simulated average 2000 3000 50): This function returns the average of the simulated spectrum between the spectral positions 2000 and 3000 (nm, eV, 1/cm or whatever spectral unit the object has at the moment), computed using 50 points.

 

(measured integral 2000 3000 50): This function returns the integral of the measured spectrum between the spectral positions 2000 and 3000 (nm, eV, 1/cm or whatever spectral unit the object has at the moment), computed using 50 points.

 

(simulated integral 2000 3000 50): This function returns the integral of the simulated spectrum between the spectral positions 2000 and 3000 (nm, eV, 1/cm or whatever spectral unit the object has at the moment), computed using 50 points.

 

(FFT thickness 5000 10000 2048 5 20 1.7): Computes and returns the FFT thickness using 2048 points between 5000 and 10000 1/cm (obtained by interpolation of the measured spectrum). The refractive index used in the method is 1.7, the thickness is searched between 5 and 20 microns.

 

(Thickness from fringes 1000 1600 0.05 20 3 2): Analyzes the maxima of interference patterns in the spectral range 1000 to 1600 (spectral unit taken from the spectrum). The function returns the layer thickness of layer 3 in the layer stack which is assigned to the spectrum. Pairs of interference maxima are taken into account only if their height is larger than 0.05 and if the peaks are separated by at least 20 (spectral unit taken from the spectrum). The function averages over 2 pairs of peaks. This function should be applied only in the case of a single layer causing the interference pattern.

 

(L* D65 2°): returns the color coordinate L*, computed for the illumation spectrum D65 and an observation angle of 2°. Possible values for the color coordinates are L*, a*, b*, X, Y, Z, x, y, z, l, a and b. Illumination spectra can be A, D65 and C, and observation angles of 2° and 10° may be used in the expression.