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The near-infrared (NIR) window (also known as optical window or therapeutic window) defines the range of wavelengths from 650 to 1350 nanometre (nm) where light has its maximum depth of penetration in tissue. [1] Within the NIR window, scattering is the most dominant light-tissue interaction, and therefore the propagating light becomes diffused ...
Certain heating pads have been marketed to provide "far infrared" therapy, which is claimed to offer deeper penetration. [citation needed] However, the infrared radiation emitted by an object is determined by its temperature. [citation needed] Therefore, all heating pads emit the same type of infrared radiation if they are at the same ...
Near-infrared spectroscopy is used in astronomy for studying the atmospheres of cool stars where molecules can form. The vibrational and rotational signatures of molecules such as titanium oxide, cyanide, and carbon monoxide can be seen in this wavelength range and can give a clue towards the star's spectral type .
Definition of sociotherapy as a social science and profession is also based on regional dicta. For example, the public health insurance system of Germany offered a uniquely German definition in order to subsidize treatment by sociotherapeutic professionals. It said that sociotherapy "designates non-medical, social, and work-related components ...
The decadic absorbance of a scattering sample is defined as −log 10 (R+T) or −log 10 (1−A). For a non scattering sample, R = 0, and the expression becomes −log 10 T or log( 1 / T ), which is more familiar. In a non-scattering sample, the absorbance has the property that the numerical value is proportional to sample thickness.
The sample is measured in transmission mode, with the light passing through the sample to a detector mounted in the spectrometer transmission port. To eliminate the effect of anisotropy, the sample is usually mounted in a wheel and can be manually rotated to allow measurements to be made at several angular positions. The spectra of all ...
Hyperspectral imaging is also used in zoology; it is used to investigate the spatial distribution of coloration and its extension into the near-infrared and SWIR range of the spectrum. [29] Some animals for example, such as some tropical frogs and certain leaf-sitting insects are highly reflective in the near-infrared. [29] [30]
If the sample is too absorbent, then it can be diluted with a nonabsorbent material such as potassium bromide, potassium chloride, etc. The particle size should be smaller than the wavelength of the incident light in order to minimize Mie scattering, so this would infer that it should be less than 5 μm for mid-infrared spectroscopy. The ...