| 摘要 |
A detector used in a measurement system that determines the size distribution of particles contained in a dispersant medium is disclosed that includes means for exciting the dispersant medium at an ultrasonic frequency to cause particles contained in the dispersant medium to oscillate at the applied ultrasonic frequency. The detector of the present invention further includes a light source for producing light energy in a specific frequency range, a first light guide for conveying the light energy from the light source to the dispersant medium, a second light guide for capturing and conveying the light energy scattered by the particles in oscillation and a third light guide for conveying light energy from said light source to the second light guide to produce heterodyned light energy. A light energy detection device optically connected to the second light guide receives the heterodyned light energy and produces signals representative of the heterodyned light energy detected. |
