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Design and optimization of a compact low-cost optical particle sizer.

Record Type:	Language materials, manuscript : Monograph/item
Title/Author:	Design and optimization of a compact low-cost optical particle sizer./
Author:	Njalsson, Tomas.
Description:	1 online resource (55 pages)
Notes:	Source: Masters Abstracts International, Volume: 56-03.
Contained By:	Masters Abstracts International56-03(E).
Subject:	Mechanical engineering. -
Online resource:	click for full text (PQDT)
ISBN:	9781369629620

Design and optimization of a compact low-cost optical particle sizer.
Njalsson, Tomas.

Design and optimization of a compact low-cost optical particle sizer. - 1 online resource (55 pages)

Source: Masters Abstracts International, Volume: 56-03.

Thesis (Master's)

Includes bibliographical references

Determining particulate matter (PM) concentrations in ambient air is of major importance in applications of aerosol research; personal exposure assessments, industrial particle monitoring, and air quality studies. Optical particle counters (OPCs) measure the elastic light scattering of individual particles and provide time and size-resolved PM number concentrations. They are common due to their simplicity and low-cost. However, many of them suffer from non-monotonic size dependence of scattered light intensity and its variability with changing the complex refractive index (CRI) of particles. This weakness is particularly common in portable low-cost OPCs.

Electronic reproduction.
Ann Arbor, Mich. :
ProQuest,
2018

Mode of access: World Wide Web

ISBN: 9781369629620Subjects--Topical Terms:

557493
Mechanical engineering.
Index Terms--Genre/Form:

554714
Electronic books.

Design and optimization of a compact low-cost optical particle sizer.
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100 1 $a Njalsson, Tomas. $3 1178892
245 1 0 $a Design and optimization of a compact low-cost optical particle sizer.
264 0 $c 2016
300 $a 1 online resource (55 pages)
336 $a text $b txt $2 rdacontent
337 $a computer $b c $2 rdamedia
338 $a online resource $b cr $2 rdacarrier
500 $a Source: Masters Abstracts International, Volume: 56-03.
500 $a Adviser: Igor V. Novosselov.
502 $a Thesis (Master's) $c University of Washington $d 2016.
504 $a Includes bibliographical references
520 $a Determining particulate matter (PM) concentrations in ambient air is of major importance in applications of aerosol research; personal exposure assessments, industrial particle monitoring, and air quality studies. Optical particle counters (OPCs) measure the elastic light scattering of individual particles and provide time and size-resolved PM number concentrations. They are common due to their simplicity and low-cost. However, many of them suffer from non-monotonic size dependence of scattered light intensity and its variability with changing the complex refractive index (CRI) of particles. This weakness is particularly common in portable low-cost OPCs.
520 $a This contribution describes the process of designing, validating, and testing an OPC for size measurements of aerosols. The proposed device is characterized by four main principles; low sensitivity to variations in the CRI of particles, accurate sizing, compactness, and low-cost. The design utilizes small form factor low-cost components (total cost < $100) and measures less than 45 x 25 x 15mm (L, W, H) in size. An optimization methodology is defined and used to determine the optimal angular range for collection of scattered light. An adjustable experimental setup was used to validate the numerical findings and to test the performance of the optimized angular range in comparison to two equally sized angular ranges, commonly employed in OPCs. The experiments used six different spherical monodisperse particles of known size and CRI; PSL (n = 1.61), alumina (n = 1.78), and silica (n = 1.53); 2 and 4 ?m in diameter. The PSL particles were used for calibration before the device was exposed to particles with different CRIs. The experimental response was in good agreement with the numerical calculations overall. The average sizing error was 6.87% for the optimal angular range, compared to 32.21% and 25.45% for the alternatives. The results show clearly that the optimal angular range is effective in eliminating the ambiguity that is commonly present when OPCs are used in the field. The findings were consistent across the two sizes and all CRIs.
533 $a Electronic reproduction. $b Ann Arbor, Mich. : $c ProQuest, $d 2018
538 $a Mode of access: World Wide Web
650 4 $a Mechanical engineering. $3 557493
650 4 $a Engineering. $3 561152
655 7 $a Electronic books. $2 local $3 554714
690 $a 0548
690 $a 0537
710 2 $a ProQuest Information and Learning Co. $3 1178819
710 2 $a University of Washington. $b Mechanical Engineering. $3 1148544
773 0 $t Masters Abstracts International $g 56-03(E).
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=10252125 $z click for full text (PQDT)