Gas Leak Detection by Dilution of Atmospheric Oxygen
Gas leak detection is an important issue in infrastructure monitoring and industrial production. In this context, infrared (IR) absorption spectroscopy is a major measurement method. It can be applied in an extractive or remote detection scheme. Tunable laser spectroscopy (TLS) instruments are able...
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doaj-f54407dc526f4b27b0aa7078fca307732020-11-24T21:43:25ZengMDPI AGSensors1424-82202017-12-011712280410.3390/s17122804s17122804Gas Leak Detection by Dilution of Atmospheric OxygenArmin Lambrecht0Eric Maier1Hans-Fridtjof Pernau2Thomas Strahl3Johannes Herbst4Fraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, D-79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, D-79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, D-79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, D-79110 Freiburg, GermanyFraunhofer Institute for Physical Measurement Techniques IPM, Heidenhofstr. 8, D-79110 Freiburg, GermanyGas leak detection is an important issue in infrastructure monitoring and industrial production. In this context, infrared (IR) absorption spectroscopy is a major measurement method. It can be applied in an extractive or remote detection scheme. Tunable laser spectroscopy (TLS) instruments are able to detect CH4 leaks with column densities below 10 ppm·m from a distance of 30 m in less than a second. However, leak detection of non-IR absorbing gases such as N2 is not possible in this manner. Due to the fact that any leaking gas displaces or dilutes the surrounding background gas, an indirect detection is still possible. It is shown by sensitive TLS measurements of the ambient background concentration of O2 that N2 leaks can be localized with extractive and standoff methods for distances below 1 m. Minimum leak rates of 0.1 mbar·L/s were determined. Flow simulations confirm that the leakage gas typically effuses in a narrow jet. The sensitivity is mainly determined by ambient flow conditions. Compared to TLS detection of CH4 at 1651 nm, the indirect method using O2 at 761 nm is experimentally found to be less sensitive by a factor of 100. However, the well-established TLS of O2 may become a universal tool for rapid leakage screening of vessels that contain unknown or inexpensive gases, such as N2.https://www.mdpi.com/1424-8220/17/12/2804gas sensorleak detectiontunable laser spectroscopyinfrared absorptionoxygennitrogenmethane |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Armin Lambrecht Eric Maier Hans-Fridtjof Pernau Thomas Strahl Johannes Herbst |
spellingShingle |
Armin Lambrecht Eric Maier Hans-Fridtjof Pernau Thomas Strahl Johannes Herbst Gas Leak Detection by Dilution of Atmospheric Oxygen Sensors gas sensor leak detection tunable laser spectroscopy infrared absorption oxygen nitrogen methane |
author_facet |
Armin Lambrecht Eric Maier Hans-Fridtjof Pernau Thomas Strahl Johannes Herbst |
author_sort |
Armin Lambrecht |
title |
Gas Leak Detection by Dilution of Atmospheric Oxygen |
title_short |
Gas Leak Detection by Dilution of Atmospheric Oxygen |
title_full |
Gas Leak Detection by Dilution of Atmospheric Oxygen |
title_fullStr |
Gas Leak Detection by Dilution of Atmospheric Oxygen |
title_full_unstemmed |
Gas Leak Detection by Dilution of Atmospheric Oxygen |
title_sort |
gas leak detection by dilution of atmospheric oxygen |
publisher |
MDPI AG |
series |
Sensors |
issn |
1424-8220 |
publishDate |
2017-12-01 |
description |
Gas leak detection is an important issue in infrastructure monitoring and industrial production. In this context, infrared (IR) absorption spectroscopy is a major measurement method. It can be applied in an extractive or remote detection scheme. Tunable laser spectroscopy (TLS) instruments are able to detect CH4 leaks with column densities below 10 ppm·m from a distance of 30 m in less than a second. However, leak detection of non-IR absorbing gases such as N2 is not possible in this manner. Due to the fact that any leaking gas displaces or dilutes the surrounding background gas, an indirect detection is still possible. It is shown by sensitive TLS measurements of the ambient background concentration of O2 that N2 leaks can be localized with extractive and standoff methods for distances below 1 m. Minimum leak rates of 0.1 mbar·L/s were determined. Flow simulations confirm that the leakage gas typically effuses in a narrow jet. The sensitivity is mainly determined by ambient flow conditions. Compared to TLS detection of CH4 at 1651 nm, the indirect method using O2 at 761 nm is experimentally found to be less sensitive by a factor of 100. However, the well-established TLS of O2 may become a universal tool for rapid leakage screening of vessels that contain unknown or inexpensive gases, such as N2. |
topic |
gas sensor leak detection tunable laser spectroscopy infrared absorption oxygen nitrogen methane |
url |
https://www.mdpi.com/1424-8220/17/12/2804 |
work_keys_str_mv |
AT arminlambrecht gasleakdetectionbydilutionofatmosphericoxygen AT ericmaier gasleakdetectionbydilutionofatmosphericoxygen AT hansfridtjofpernau gasleakdetectionbydilutionofatmosphericoxygen AT thomasstrahl gasleakdetectionbydilutionofatmosphericoxygen AT johannesherbst gasleakdetectionbydilutionofatmosphericoxygen |
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