Details
| Original language | English |
|---|---|
| Title of host publication | IEEE SENSORS 2013 |
| Publisher | Institute of Electrical and Electronics Engineers Inc. |
| Number of pages | 4 |
| ISBN (electronic) | 9781467346429 |
| ISBN (print) | 9781467346405 |
| Publication status | Published - 19 Dec 2013 |
| Event | 12th IEEE SENSORS 2013 Conference - Renaissance Baltimore Harborplace Hotel, Baltimore, United States Duration: 3 Nov 2013 → 6 Nov 2013 Conference number: 12 http://archive.ieee-sensors.org/conference-websites-archive/sensors2013/ |
Publication series
| Name | Proceedings of IEEE Sensors |
|---|---|
| ISSN (Print) | 1930-0395 |
| ISSN (electronic) | 2168-9229 |
Abstract
We present a miniaturized non-radioactive electron source based on thermo emission for generating free electrons at atmospheric pressure. Most gas sensor systems based on atmospheric pressure chemical ionization (APCI), such as ion mobility spectrometers, use radioactive beta minus sources to provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes to be detected. Instead of a radioactive beta source we generate free electrons by classical thermo emission from a tungsten filament in vacuum. The emitted free electrons are then accelerated towards an electron transparent Si3N4 membrane, through which the electrons are transferred from vacuum to atmospheric pressure. For both the development process and operation of this non-radioactive beta minus source pressure monitoring inside the vacuum chamber is required. Our setup already comprises all necessary components for measuring an ion current proportional to the pressure. These ions are generated within the residual gas inside the vacuum chamber through electron bombardment. However, if the electron emission in the vacuum chamber is not constant, both the ion current and the electron emission need to be measured to calculate the pressure. This increases the instrumental effort. Therefore, we present a new method for monitoring the pressure that is based on electric retarding field dependent ion currents.
ASJC Scopus subject areas
- Engineering(all)
- Electrical and Electronic Engineering
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IEEE SENSORS 2013. Institute of Electrical and Electronics Engineers Inc., 2013. (Proceedings of IEEE Sensors).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - A miniaturized non-radioactive electron emitter including a vacuum pressure gauge based on electric retarding field ion currents
AU - Cochems, Philipp
AU - Mazarin, Daniel
AU - Zimmermann, Stefan
N1 - Conference code: 12
PY - 2013/12/19
Y1 - 2013/12/19
N2 - We present a miniaturized non-radioactive electron source based on thermo emission for generating free electrons at atmospheric pressure. Most gas sensor systems based on atmospheric pressure chemical ionization (APCI), such as ion mobility spectrometers, use radioactive beta minus sources to provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes to be detected. Instead of a radioactive beta source we generate free electrons by classical thermo emission from a tungsten filament in vacuum. The emitted free electrons are then accelerated towards an electron transparent Si3N4 membrane, through which the electrons are transferred from vacuum to atmospheric pressure. For both the development process and operation of this non-radioactive beta minus source pressure monitoring inside the vacuum chamber is required. Our setup already comprises all necessary components for measuring an ion current proportional to the pressure. These ions are generated within the residual gas inside the vacuum chamber through electron bombardment. However, if the electron emission in the vacuum chamber is not constant, both the ion current and the electron emission need to be measured to calculate the pressure. This increases the instrumental effort. Therefore, we present a new method for monitoring the pressure that is based on electric retarding field dependent ion currents.
AB - We present a miniaturized non-radioactive electron source based on thermo emission for generating free electrons at atmospheric pressure. Most gas sensor systems based on atmospheric pressure chemical ionization (APCI), such as ion mobility spectrometers, use radioactive beta minus sources to provide free electrons with high kinetic energy to initiate a chemical gas phase ionization of the analytes to be detected. Instead of a radioactive beta source we generate free electrons by classical thermo emission from a tungsten filament in vacuum. The emitted free electrons are then accelerated towards an electron transparent Si3N4 membrane, through which the electrons are transferred from vacuum to atmospheric pressure. For both the development process and operation of this non-radioactive beta minus source pressure monitoring inside the vacuum chamber is required. Our setup already comprises all necessary components for measuring an ion current proportional to the pressure. These ions are generated within the residual gas inside the vacuum chamber through electron bombardment. However, if the electron emission in the vacuum chamber is not constant, both the ion current and the electron emission need to be measured to calculate the pressure. This increases the instrumental effort. Therefore, we present a new method for monitoring the pressure that is based on electric retarding field dependent ion currents.
UR - http://www.scopus.com/inward/record.url?scp=84893952832&partnerID=8YFLogxK
U2 - 10.1109/ICSENS.2013.6688218
DO - 10.1109/ICSENS.2013.6688218
M3 - Conference contribution
AN - SCOPUS:84893952832
SN - 9781467346405
T3 - Proceedings of IEEE Sensors
BT - IEEE SENSORS 2013
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 12th IEEE SENSORS 2013 Conference
Y2 - 3 November 2013 through 6 November 2013
ER -