| 摘要 |
<p>An apparatus and method to determine the concentration of an absorptive constituent in a scattering medium. A light source (10) is coupled to a scattering medium (20) and is detected by a detector (16) after migrating through the medium. A reference signal (18) is mixed with the detected signal resulting in a phase shifted detected signal (22) from which the concentration is determined (26).</p> |
