New Device Can Now Detect Particles Below 1nm
German company Grimm Aerosol Technik has introduced a unique particle counting system that detects particles down to 1nm or less. This system is based on the principle of the Faraday Cup electrometer (which measures ion-beam currents). The Grimm FCE works by locating the charge on the particles versus relying on growing the particles to a detectable size. Other sensitive electrometers of this type are usually susceptible to noise and drift, but the Grimm FCE employs lock-in amplifier technology to address this issue. Possible applications for this system in the environmental field include drive-by measurement of automotive exhaust emissions.