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Although water is nearly transparent in the range of visible light, it becomes absorbing over the near-infrared region. Water is a critical component since its concentration is high in human tissue. The absorption spectrum of water in the range from 250 to 1000 nm is shown in Figure 2.
The type of detector used depends primarily on the range of wavelengths to be measured. Silicon-based CCDs are suitable for the shorter end of the NIR range, but are not sufficiently sensitive over most of the range (over 1000 nm). InGaAs and PbS devices are more suitable and have higher quantum efficiency for wavelengths above 1100 nm. It is ...
Free-electron laser: A broad wavelength range (0.1 nm - several mm); a single FEL may be tunable over a wavelength range Relativistic electron beam: Atmospheric research, material science, medical applications. CO₂ gas dynamic laser: Several lines around 10.5 μm; other frequencies may be possible with different gas mixtures
Different fNIRS techniques can also use the way in which light propagates to estimate blood volume and oxygenation. The technique is safe, non-invasive, and can be used with other imaging modalities. fNIRS is a non-invasive imaging method involving the quantification of chromophore concentration resolved from the measurement of near infrared ...
The commonly used wavelengths targeting hair loss disorder are red and infrared. [34] In-vivo studies show that the red-light LEDT at the wavelength of 655 nm contributes to dramatic improvements in the hair counts of androgenetic alopecia patients. [35] A more recent study indicates a similar therapeutic effect of yellow-light LEDT on ...
Each substance of interest absorbs photons at a specific wavelength, as a result only certain substances will innately produce a PA signal at a given wavelength. For example, hemoglobin and melanin are two common biological substances that produce strong PA signals in response to laser pulses around the 680 nm wavelength range. [3]
It can be used in determining the blood alcohol content of a suspected drunk driver. IR spectroscopy has been used in identification of pigments in paintings [2] and other art objects [3] such as illuminated manuscripts. [4] Infrared spectroscopy is also useful in measuring the degree of polymerization in polymer manufacture. Changes in the ...
Intravenous or intravascular laser blood irradiation (ILBI) involves the in-vivo illumination of the blood by feeding low level laser light generated by a 1–3 mW helium–neon laser at a wavelength of 632.8 nanometers (nm) into a vascular channel, usually a vein in the forearm, under the assumption that any therapeutic effect will be ...
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