| 摘要 |
<p>A method for producing measurements of specific key characteristic parameters of small particles suspended within a scattering medium includes the step of directing a beam of light into the scattering medium, then detecting the Doppler-shifted components of light scattered by the movement of the suspended particles and unscattered light from the source and generating a first signal representative of the power spectral density of the Doppler-shifted components and unscattered light. The first signal is next applied to a plurality of bandpass filters to generate a plurality of second signals, the magnitude of which are representative of the power spectral density integrated over the bandpass. The first signal is also applied to a low pass filter that generates a third signal, used in deriving the concentration of the particles in the scattering medium. Each second signal is then normalized by dividing each second signal by the third signal, thereby developing a plurality of individual ratiometric signals whose magnitude is representative of a measurement of a specific key characteristic parameter of the particles in the scattering medium.</p> |
