G. Mordas, V. Ulevicius, K. Plauškaitė, and N. Prokopčiuk
The main performance characteristics of
the modernized condensation particle counter (CPC) UF-02M were determined.
We studied the particle number concentration range of the instrument and
the detection efficiency as a function of the particle diameter experimentally.
In order to determine a cut-size D
50, the function was fitted to the experimental data. According to
the fitting, the cut-size was 4.35 nm. The determined cut-size allows detecting
the aerosol particles of the nucleation mode, giving possibilities to find
many applications of the CPC UF-02M in the investigations of the aerosol nanometre
particle dynamical properties. The counting efficiency of the CPC at high
particle concentrations was experimentally investigated using silver particles
of a 20 nm diameter. The minimum measured number concentration of aerosol
particles was 0.003 cm–3, the maximum was 150000 cm–3
with the accuracy of 20%. The operation of the CPC UF-02M was compared with
the operation of a commercially available SMPS TSI3936 under ambient conditions.
The measured number concentrations were comparable with 5% accuracy. During
the testing time, both instruments detected a new particle formation event.
It was determined that the number concentration measured with the modernized
CPC was higher than that determined by the SMPS. It was explained that a
new CPC had a lower cut-size and detected smaller particles than the SMPS
did.
Straipsnyje pateikiami patobulinto kondensacinio
dalelių skaitiklio UF-02M eksperimentinių tyrimų duomenys. Nustatyti pagrindiniai
skaitiklio veikimo parametrai (kondensacinės kameros ir garintuvo temperatūros,
aerozolio ir butanolio garų srautai). Įvertinta aerozolio dalelių registravimo
efektyvumo priklausomybė nuo dalelių dydžio. Taikant trijų laisvų parametrų
funkciją įvertintas registravimo efektyvumo ribinis dydis (
D50 %), kuris yra 4,35 nm. Įvertintas aerozolio dalelių
skaičiavimo efektyvumas naudojant 20 nm dydžio sidabro dalelės. Nustatytos
mažiausios ir didžiausios registruojamos dalelių skaitinės koncentracijos:
atitinkamai 0,003 ir 150 000 cm–3. Atliktas kondensacinio dalelių
skaitiklio UF-02M testavimas aplinkos sąlygomis matuojant Baltijos jūros
pakrantės aerozolį kartu su komerciniu aerozolio dalelių spektrometru TSI3936.
Palyginimo rezultatai parodė, kad matuojamos dalelių koncentracijos sutampa
5 % tikslumu. Tačiau UF-02M registravo didesnes koncentracijas naujų dalelių
susidarymo metu. Tai paaiškinama tuo, kad skaitiklio UF-02M registravimo
efektyvumo ribinis dydis yra mažesnis negu komercinio spektrometro TSI3936.
Tikimės, kad patobulinto kondensacinio dalelių skaitiklio UF-02M taikymas
atmosferos fizikos tyrimams suteiks galimybę sukaupti tikslesnių ir vertingų
žinių apie aerozolio nanometrinių dalelių dinaminius procesus.
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