dorsal/arxiv
View SchemaInstrumentation for atmospheric ion measurements
| Authors | K. L. Aplin |
|---|---|
| Categories | |
| ArXiv ID | physics/0501106 |
| URL | https://arxiv.org/abs/physics/0501106 |
Abstract
Small ions are part of the atmospheric aerosol spectrum, and study of ion-aerosol interactions is fundamental in atmospheric physics. Air ion physics and instrumentation are reviewed, including the historical context. A miniaturised Gerdien condenser for ion measurement, operating in situ to minimise inlet errors, is described. Two operating modes using independent current and voltage decay measurements are employed. A more sophisticated self-calibrating and fully programmable ion mobility spectrometer (PIMS) based on the same principles, is also discussed. Detailed analysis of error terms and application of new technology is demonstrated to greatly improve its capability. Self-consistent experimental approaches, including ionisation and ion concentration instruments, are used for calibration. In developing and characterising the individual components of the PIMS, favourable and unfavourable operating regimes are identified: this approach can also be applied to other aspiration ion counting techniques. Use of a sophisticated programmable electrometer permits compensation for leakage terms. Electrically-charged aerosol particles have been found to complicate the ion measurements. Consequently, conventional ion-aerosol theory, which neglects the particulate concentration, is thought to be incomplete. The polymodal ion mobility spectrum is also found to influence the instrument's operation. Development of the novel programmable ion instrumentation, in conjunction with consideration of the ion mobility spectrum yields an improved and flexible approach to in situ atmospheric ion measurements.
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"abstract": "Small ions are part of the atmospheric aerosol spectrum, and study of\nion-aerosol interactions is fundamental in atmospheric physics. Air ion physics\nand instrumentation are reviewed, including the historical context. A\nminiaturised Gerdien condenser for ion measurement, operating in situ to\nminimise inlet errors, is described. Two operating modes using independent\ncurrent and voltage decay measurements are employed. A more sophisticated\nself-calibrating and fully programmable ion mobility spectrometer (PIMS) based\non the same principles, is also discussed. Detailed analysis of error terms and\napplication of new technology is demonstrated to greatly improve its\ncapability. Self-consistent experimental approaches, including ionisation and\nion concentration instruments, are used for calibration. In developing and\ncharacterising the individual components of the PIMS, favourable and\nunfavourable operating regimes are identified: this approach can also be\napplied to other aspiration ion counting techniques. Use of a sophisticated\nprogrammable electrometer permits compensation for leakage terms.\nElectrically-charged aerosol particles have been found to complicate the ion\nmeasurements. Consequently, conventional ion-aerosol theory, which neglects the\nparticulate concentration, is thought to be incomplete. The polymodal ion\nmobility spectrum is also found to influence the instrument\u0027s operation.\nDevelopment of the novel programmable ion instrumentation, in conjunction with\nconsideration of the ion mobility spectrum yields an improved and flexible\napproach to in situ atmospheric ion measurements.",
"arxiv_id": "physics/0501106",
"authors": [
"K. L. Aplin"
],
"categories": [
"physics.ao-ph",
"physics.geo-ph"
],
"title": "Instrumentation for atmospheric ion measurements",
"url": "https://arxiv.org/abs/physics/0501106"
},
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