An Ultra-Low Current Meter for Aerosol Detection
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An ultra-low current meter (ULCM) is used for charged aerosol measurement. In this work, a prototype of the ULCM was designed, built and experimentally tested. Commercially-available operational amplifiers were used to construct the meter. The range of the current measurement of the ULCM was from 1 to 500 pA, corresponding to number concentrations of aerosol particles in the range of 1011 - 1014 particles/m3. The ULCM was relatively simple, inexpensive and compact. The ULCM’s performance was evaluated with a high-impedance current source and compared with a commercial electrometer, Keithley model 6517A. It was found to be in accord with theoretical predictions and close agreements with the commercial instrument. The prototype meter was proven to be promising for aerosol detection.
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