Electrical aerosol spectrometry (EAS) is a technique for measurement of the number-size distribution of aerosol using a combination of electrical charging and multiple solid state electrometer detectors. The technique combines both diffusion and field charging regimes to cover the diameter range 10 nm to 10 μm.[1][2]
Subsequent developments of the technique enable measurements faster than 1 Hz, although in each case with a reduced size range.[3][4]
High charging efficiency allows sufficient charge to be placed on individual particles that the use of electrometer detectors is practicable, while the use of parallel electrometer detectors allows real time measurement of the size/number spectrum with output data as fast as 0.25 Hz.
Unlike SMPS-type devices, multiple charging is an inherent issue across almost the entire size range of EAS-type devices. Accurate characterization of the electrical charging of the aerosol is therefore an essential component of device design.[5]
Calibrationedit
Techniques for the traceable calibration of such devices are established, and result in good agreement (subject to suitable signal levels) with slower but more sensitive scanning mobility particle sizers.[6]
Applicationsedit
Applications include the measurement of engine exhaust, cigarette smoke, and ambient/atmospheric studies.
The technique is particularly appropriate for situations where aerosol concentrations are changing on a timescale of 1 s or faster.
Referencesedit
^Tammet; et al. (1998). "Electrical aerosol spectrometer of Tartu University". Journal of Aerosol Science. 29: S427–S428. Bibcode:1998JAerS..29S.427T. doi:10.1016/S0021-8502(98)00595-3.
^Tammet; et al. (2002). "Electrical aerosol spectrometer of Tartu University". Atmospheric Research. 62 (3–4): 315–324. Bibcode:2002AtmRe..62..315T. doi:10.1016/S0169-8095(02)00017-0.
^Reavell, K (2002). "Fast Response Classification of Fine Aerosols with a Differential Mobility Spectrometer" (PDF). UK Aerosol Society, Annual Conference. Retrieved 13 March 2015.
^Johnson; et al. (2004). "A New Electrical Mobility Particle Sizer Spectrometer for Engine Exhaust Particle Measurements". SAE World Congress. doi:10.4271/2004-01-1341. Retrieved 13 March 2015.
^Biskos; et al. (2005). (PDF). Aerosol Science and Technology. 39: 527–541. Bibcode:2005AerST..39..527B. doi:10.1080/027868291004832. Archived from the original (PDF) on 2 April 2015. Retrieved 13 March 2015.
^Symonds, Jonathan. "Calibration of Fast Response Differential Mobility Spectrometers" (PDF). National Physical Laboratory, UK. Retrieved 13 March 2015.
April 16, 2024
electrical, aerosol, spectrometer, electrical, aerosol, spectrometry, technique, measurement, number, size, distribution, aerosol, using, combination, electrical, charging, multiple, solid, state, electrometer, detectors, technique, combines, both, diffusion, . Electrical aerosol spectrometry EAS is a technique for measurement of the number size distribution of aerosol using a combination of electrical charging and multiple solid state electrometer detectors The technique combines both diffusion and field charging regimes to cover the diameter range 10 nm to 10 mm 1 2 Subsequent developments of the technique enable measurements faster than 1 Hz although in each case with a reduced size range 3 4 Contents 1 Aerosol charging 2 Calibration 3 Applications 4 ReferencesAerosol charging editHigh charging efficiency allows sufficient charge to be placed on individual particles that the use of electrometer detectors is practicable while the use of parallel electrometer detectors allows real time measurement of the size number spectrum with output data as fast as 0 25 Hz Unlike SMPS type devices multiple charging is an inherent issue across almost the entire size range of EAS type devices Accurate characterization of the electrical charging of the aerosol is therefore an essential component of device design 5 Calibration editTechniques for the traceable calibration of such devices are established and result in good agreement subject to suitable signal levels with slower but more sensitive scanning mobility particle sizers 6 Applications editApplications include the measurement of engine exhaust cigarette smoke and ambient atmospheric studies The technique is particularly appropriate for situations where aerosol concentrations are changing on a timescale of 1 s or faster References edit Tammet et al 1998 Electrical aerosol spectrometer of Tartu University Journal of Aerosol Science 29 S427 S428 Bibcode 1998JAerS 29S 427T doi 10 1016 S0021 8502 98 00595 3 Tammet et al 2002 Electrical aerosol spectrometer of Tartu University Atmospheric Research 62 3 4 315 324 Bibcode 2002AtmRe 62 315T doi 10 1016 S0169 8095 02 00017 0 Reavell K 2002 Fast Response Classification of Fine Aerosols with a Differential Mobility Spectrometer PDF UK Aerosol Society Annual Conference Retrieved 13 March 2015 Johnson et al 2004 A New Electrical Mobility Particle Sizer Spectrometer for Engine Exhaust Particle Measurements SAE World Congress doi 10 4271 2004 01 1341 Retrieved 13 March 2015 Biskos et al 2005 Description and Theoretical Analysis of a Differential Mobility Spectrometer PDF Aerosol Science and Technology 39 527 541 Bibcode 2005AerST 39 527B doi 10 1080 027868291004832 Archived from the original PDF on 2 April 2015 Retrieved 13 March 2015 Symonds Jonathan Calibration of Fast Response Differential Mobility Spectrometers PDF National Physical Laboratory UK Retrieved 13 March 2015 Retrieved from https en wikipedia org w index php title Electrical aerosol spectrometer amp oldid 1021807763, wikipedia, wiki, book, books, library,
