| 摘要 |
<p>A method of and apparatus for determining the presence of a chemical species in condensed matter (104) that scatters and absorbs electromagnetic energy. The method includes the steps of exciting a volume of the matter (104) with electromagnetic energy of a predetermined wavelength to cause the volume (104) to generate acoustic energy, detecting the acoustic energy, generating a signal representation of the amplitude of the acoustic energy, and analyzing the amplitude to determine the presence of the chemical species. The apparatus includes an electromagnetic irradiating device (111, 116, 117), a device for scanning the wavelength of the electromagnetic energy (114), an acoustic energy detecting transducer (108) and acoustic amplitude analyzer (111, 113, 114).</p> |
