| 摘要 |
<p>A material such as a finger (104) to be analyzed is irradiated with electromagnetic radiation emanating from an optical fiber (116) so that the material (104) absorbs the electromagnetic radiation. An acoustic wave generated in the material (104) as a result of the interaction of electromagnetic radiation with the material (104) is sensed by a transducer (108) and converted to an acoustic signal, the acoustic signal providing information useful to determine the composition of the material. The magnitude of the acoustic signal is diorectly related to the amount of energy absorbed in the material (104). The magnitude of the acoustic signal is recorded as a function of wavelength to provide a direct measure of the amount of absorption in the material (104) as a function of wavelength. A variety of univariate and multivariate analysis techniques are used to deduce the individual concentrations of components in the material (104).</p> |
