Piezoelectric-Electrostatic Aerosol Mass Concentration Monitor

Measurement of PM2.5 Mass Concentration Using an Electrostatic Particle Concentrator-Based Quartz Crystal Microbalance

“…QCM-based instruments can be classified into two major categories based on particle capture mechanism: (i) inertial impaction [10], [14], [15], [19], [24], and (ii) external force based impaction (e.g. electrostatic force) [12], [13], [17], [18], [25], [26]. In the first one, the sensing electrode of the quartz crystal works as an impaction plate.…”

“…For these reasons, the QCM was combined with the electrostatic precipitator (ESP) [12], [13], [17], [18]. These instruments possess advantages in comparison with the inertial impaction-based QCMs.…”

Direct‐reading Aerosol Sampling Instruments

“…From Equation (20.4), it can be seen that if f and f can be detected and measured in the external driving circuitry, then m may be obtained, provided that k can be determined by means of appropriate calibration. In some other applications of the piezoelectric mass balance idea, impaction has also been employed for particle Figure 20.18 Diagram to show a typical configuration for a piezoelectric mass balance aerosol sampling system in which the particles are deposited by electrostatic precipitation (after Olin et al, 1971). So an instrument based on this idea can in principle provide real time information about aerosol concentration.…”

6D-2 MEMS-Enabled Miniaturized Particulate Matter Monitor Employing 1.6 GHz Aluminum Nitride Thin-Film Bulk Acoustic Wave Resonator (FBAR) and Thermophoretic Precipitator

“…The work includes a microfabricated corona discharge ionizer [2] and the use of a quartz-crystal microbalance to monitor airborne PM deposited by electrostatic discharge [3], inertial impaction [4], and thermophoresis [5]. The last work, by researchers at the Lawrence Berkeley National Laboratory (LBNL), also employed ultra-violet and infra-red fiber-optic probes to discriminate the mass composition, and served as the impetus for this work.…”