초록 ▼

A system and method for monitoring conditions in a fluid medium. A stream of the fluid medium is flowed through a fluid container which is electrically configured as a transmission line segment and which is electrically connected to load to UHF or microwave oscillator. The oscillator is not isolated

A system and method for monitoring conditions in a fluid medium. A stream of the fluid medium is flowed through a fluid container which is electrically configured as a transmission line segment and which is electrically connected to load to UHF or microwave oscillator. The oscillator is not isolated from the load, and is operated free-running, at a starting frequency which is chosen to provide a particularly strong shift in permittivity of the fluid medium, as the chemical reaction progresses. Preferably the frequency and insertion loss of the oscillator are monitored, to gauge the progress of the reaction.

대표청구항 ▼

A system for controlling a process, comprising: a voltage-controlled oscillator, which includes a gain element capable of providing substantial gain at frequencies greater than 100 MHz; a feedback path, coupling the output of said gain element to the input thereof, said feedback path including a tun

A system for controlling a process, comprising: a voltage-controlled oscillator, which includes a gain element capable of providing substantial gain at frequencies greater than 100 MHz; a feedback path, coupling the output of said gain element to the input thereof, said feedback path including a tunable resonant circuit; an electromagnetic propagation structure which is RF-coupled to load said oscillator and in which electromagnetic wave propagation is electrically loaded by a portion of a medium undergoing said process; means for monitoring the frequency and insertion loss of said oscillator to ascertain changes in the composition of the medium; and means for controlling one or more process variables in accordance with the output of said monitoring means.