So there is no need for critical selection of wavelengths which leads to highly reproducible and robust results.
Previous system characterization and analysis studies looked into various fNIRS parameters such as type of light source, number and selection of wavelengths, distance between light source and detector.
To maximize the effect of a laser display and its color contents, it is desirable to generate laser beams with wide selection of wavelengths.
The main changes accomplished were the selection of wavelengths representative of the optically relevant constituents (ORCs) and calibration of values directly associated with the pigments and detritus plus colored dissolved organic material (CDM) absorption coefficients.
Conversely to lamps, lasers are typically near-monochromatic enabling the exact selection of wavelengths and the precise application of light.
The goal of the first step is the recovery of a temporal change of absorption Δ μ λ at wavelength λ for a selection of wavelengths.
The selection of wavelengths for the design of thin-film optical filters was based on simulations of wavelength reduction on an existing diffuse reflectance data set.
We set the Meta channel of the microscope (which allows for selection of specific wavelengths) to detect wavelengths between 474 and 494 nm to allow for the fact that we work in reflectance mode [38], which has the significant advantage of avoiding the use of fluorescent dyes in the samples.
In selection of excitation wavelength, we emphasize on the linearity and reproducibility of the calibration graph even if the other excitation wavelengths showed higher sensitivity relative to the selected one.
The selection of the wavelength range under investigation is achieved by placing a filter or a set of filters in front of the lens.
This review addresses the selection of the wavelength in relation to the optical constants of materials, the layer growth mechanisms and ways to reduce layer roughness and interlayer formation.
