At first, measuring optical path is improved, and some equipments such as aspherical mirror, high precision CCD camera are employed to eliminate the subjective error; with the analysis of the optical path, the mathematical model of triaxial parallelism is built, and the error factors are analyzed and calculated.
DHM can provide diffraction-limited lateral resolution comparable to common optical microscopy, and is capable of measuring optical path or thickness with sub-wavelength accuracy [ 25, 31].
Due to this SLIM provides the ability to measure optical path length with unparalleled sensitivities of 0.28 nm spatially and 0.029 nm temporally [ 16].
As UHR-AO-OCT measures optical path length (not physical length), we assumed a refractive index of the OS of n os = 1.43 in all subjects [ 36].
Since continuous wave systems cannot measure optical path length (Hoshi 2003), and no specific value for the optical path length was adopted according to the previous literature (e.g., Duncan et al. 1996), the scale unit was molar-concentration multiplied by the unknown path length (mmol × cm).
Following the approach of Kanick et al. [ 21, 22], we measured optical phantoms to construct an empirical model of the non-contact reflectance photon path length dependence on the absorption coefficient and reduced scattering coefficient of the optically sampled medium.
By integration of the calculated velocity v z(t) over the time course of the laser irradiation the total local displacement Δ z(t) of the tissue, measured in optical path lengths, was calculated.
To minimize bleaching of the dye molecules and photodynamic damages to slices, a heat-absorption filter was placed on the slices, and the light path to the slice was opened only long enough to measure optical responses (1 2 s).
However, measuring optical signals usually requires expensive, complex instruments.
Further the optical intensity at the output port of a MZI has been measured while the optical path length difference was tuned by creating a temperature difference between the two arms of the MZI.
