| 摘要 |
<p>An apparatus in which the concentration of particles in a mix is controlled substantially about a preselected ratio. An electrode passes through the mix and attracts particles thereto. The electrode, with the particles adhering thereto, is illuminated, and the light rays transmitted therefrom are detected by a substantially thermally insensitive sensor. The electrical output signal from the sensor is stably amplified to at least a predetermined level.</p> |
