Details
| Original language | English |
|---|---|
| Pages (from-to) | 262-273 |
| Number of pages | 12 |
| Journal | Technisches Messen |
| Volume | 88 |
| Issue number | 5 |
| Early online date | 20 Mar 2021 |
| Publication status | Published - 26 May 2021 |
Abstract
While the resolving power of drift tube ion mobility spectrometers has been studied and modelled in detail over the past decades, no comparable model exists for the signal-to-noise-ratio. In this work, we develop an analytical model for the signal-to-noise-ratio of a drift tube ion mobility spectrometer based on the same experimental parameters used for modelling the resolving power. The resulting holistic model agrees well with experimental results and allows simultaneously optimizing both resolving power and signal-to-noise-ratio. Especially, it reveals several unexpected relationships between experimental parameters. First, even though reduced initial ion packet widths result in fewer injected ions and reduced amplifier widths result in more noise, the resulting shift of the optimum operating point when reducing both simultaneously leads to a constant signal-to-noise-ratio. Second, there is no dependence of the signal-to-noise-ratio at the optimum operating point on the drift length, as again the resulting shift of the optimum operating point causes all effects to compensate each other.
Keywords
- IMS, Ion mobility spectrometer, Limit of detection, Resolving power, Trace gas detection
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Instrumentation
- Engineering(all)
- Electrical and Electronic Engineering
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In: Technisches Messen, Vol. 88, No. 5, 26.05.2021, p. 262-273.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Analytical model for the signal-to-noise-ratio of drift tube ion mobility spectrometers Analytisches Modell für das Signal-Rausch-Verhältnis von Driftzeit-Ionenmobilitätsspektrometern
AU - Kirk, Ansgar T.
AU - Bohnhorst, Alexander
AU - Zimmermann, Stefan
PY - 2021/5/26
Y1 - 2021/5/26
N2 - While the resolving power of drift tube ion mobility spectrometers has been studied and modelled in detail over the past decades, no comparable model exists for the signal-to-noise-ratio. In this work, we develop an analytical model for the signal-to-noise-ratio of a drift tube ion mobility spectrometer based on the same experimental parameters used for modelling the resolving power. The resulting holistic model agrees well with experimental results and allows simultaneously optimizing both resolving power and signal-to-noise-ratio. Especially, it reveals several unexpected relationships between experimental parameters. First, even though reduced initial ion packet widths result in fewer injected ions and reduced amplifier widths result in more noise, the resulting shift of the optimum operating point when reducing both simultaneously leads to a constant signal-to-noise-ratio. Second, there is no dependence of the signal-to-noise-ratio at the optimum operating point on the drift length, as again the resulting shift of the optimum operating point causes all effects to compensate each other.
AB - While the resolving power of drift tube ion mobility spectrometers has been studied and modelled in detail over the past decades, no comparable model exists for the signal-to-noise-ratio. In this work, we develop an analytical model for the signal-to-noise-ratio of a drift tube ion mobility spectrometer based on the same experimental parameters used for modelling the resolving power. The resulting holistic model agrees well with experimental results and allows simultaneously optimizing both resolving power and signal-to-noise-ratio. Especially, it reveals several unexpected relationships between experimental parameters. First, even though reduced initial ion packet widths result in fewer injected ions and reduced amplifier widths result in more noise, the resulting shift of the optimum operating point when reducing both simultaneously leads to a constant signal-to-noise-ratio. Second, there is no dependence of the signal-to-noise-ratio at the optimum operating point on the drift length, as again the resulting shift of the optimum operating point causes all effects to compensate each other.
KW - IMS
KW - Ion mobility spectrometer
KW - Limit of detection
KW - Resolving power
KW - Trace gas detection
UR - http://www.scopus.com/inward/record.url?scp=85103092872&partnerID=8YFLogxK
U2 - 10.1515/teme-2021-0013
DO - 10.1515/teme-2021-0013
M3 - Article
AN - SCOPUS:85103092872
VL - 88
SP - 262
EP - 273
JO - Technisches Messen
JF - Technisches Messen
SN - 0171-8096
IS - 5
ER -