Characterization of a modified printed optical particle spectrometer for high-frequency and high-precision laboratory and field measurements
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Published:2022-09-01
Issue:17
Volume:15
Page:5007-5018
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ISSN:1867-8548
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Container-title:Atmospheric Measurement Techniques
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language:en
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Short-container-title:Atmos. Meas. Tech.
Author:
Kasparoglu SabinORCID, Islam Mohammad MaksimulORCID, Meskhidze Nicholas, Petters Markus D.ORCID
Abstract
Abstract. The printed optical particle spectrometer (POPS) is a lightweight, low-cost
instrument for measurements of aerosol number concentrations and size
distributions. This work reports on modifications of the Handix Scientific
commercial version of the POPS to facilitate its use in multi-instrument
aerosol sampling systems. The flow system is modified by replacing the
internal pump with a needle valve and a vacuum pump. The instrument is
integrated into closed-flow systems by routing the sheath flow from filtered
inlet air. A high-precision multichannel analyzer (MCA) card is added to
sample the analog pulse signal. The MCA card is polled at 10 Hz frequency
using an external data acquisition system and improves upon the count-rate
limitation associated with the POPS internal data acquisition system. The
times required to change the concentration between 90 % and 10 % and vice versa
for a step change in concentration were measured to be 0.17 and 0.41 s at
a flow rate of 5 cm3 s−1. This yields a sampling frequency of
∼ 1–2 Hz, below which the amplitude of measured fluctuations is
captured with > 70 % efficiency. The modified POPS was
integrated into the dual tandem differential mobility analyzer system to
explore the coalescence of dimer particles. Results show that the
pulse-height response increases upon dimer coalescence. The magnitude of the
increase is broadly consistent with the change in light-scattering amplitude
predicted by the T-matrix method. It is anticipated that this modified
version of the POPS will extend the utilization of the technique for a range
of field and laboratory applications.
Funder
U.S. Department of Energy
Publisher
Copernicus GmbH
Subject
Atmospheric Science
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