NEREUS: engineering concept for an underwater mass spectrometer

Hemond, H.; Camilli, Richard

doi:10.1016/s0165-9936(02)00113-9

Cited by 26 publications

(23 citation statements)

References 23 publications

(23 reference statements)

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“…low molecular weight polar pollutants) that can be detected in situ. Another compact in-situ mass spectrometric system (NEREUS) has been developed (Hemond and Camilli, 2002;Camilli and Hemond, 2004) that enables an efficient, rapid evaluation of underwater spectra. This instrument has double focusing of the ion beam and, hence, can measure mass spectra at relatively high resolution.…”

Section: Spectroscopic Methodsmentioning

confidence: 99%

Use of In‐Situ Methods

Greenwood

Mills

Fones

et al. 2011

Chemical Marine Monitoring

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Section: Spectroscopic Methodsmentioning

confidence: 99%

Use of In‐Situ Methods

Greenwood

Mills

Fones

et al. 2011

Chemical Marine Monitoring

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“…Measurement of ion intensity at various m/z values thus provides identity and concentration of dissolved gases. The instrument is an updated version of the instrument described by Hemond and Camilli (2002) with new inlet system, electrometer, computer system, and control software. The instrument is controlled by a Technologic Systems TS-5500 microcomputer running TSLinux 3.07a.…”

Section: Materials and Proceduresmentioning

confidence: 99%

“…To address a major need in chemical sensing, the NEREUS underwater mass spectrometer (Hemond and Camilli 2002) was developed to measure metabolically relevant dissolved gases. In situ chemical measurement will facilitate muchincreased spatiotemporal coverage that is likely be important in understanding phenomena such as inflows from discrete underwater springs or seepage areas, episodic release of gases by ebullition, formation of intrusions in stratified lakes due to boundary mixing, or short-lived inhomogeneities in oxygen or carbonate concentration as a result of patchy distribution of phytoplankton.…”

Section: Introductionmentioning

confidence: 99%

The NEREUS in‐lake wireless/acoustic chemical data network

Hemond

Cheung

Mueller

et al. 2008

Limnology & Ocean Methods

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We describe a system for the semi-autonomous in situ measurement of lake chemical properties, with high temporal resolution and the potential to map chemical properties in 3 dimensions. The system comprises both fixed sensor locations on moored buoys and one (or potentially more) autonomous underwater vehicles (AUVs) serving as mobile underwater sensor platforms. Sensors include conventional water quality multiprobes and thermistor strings and the NEREUS underwater mass spectrometer for measurement of dissolved metabolic gases such as methane as well as permanent gases. Data are delivered to a shore station via a network that includes acoustic modems for communication with the AUV and a radio network operating in the license-free ISM (industrial, scientific, and medical) band operating under the IEEE 802.11b protocol. The system is designed to use low-cost commercial hardware and open-source software wherever possible. We constructed a prototype system of 3 buoys, 1 AUV, and a shore station, and field tests have demonstrated its ability to measure and remotely display lake chemical data in real time.

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“…The challenges involved are related to sample introduction, vacuum control, and power consumption. The biggest challenge encountered by submersible systems is that they must operate over a considerable range of external hydrostatic pressures (very high for deep water) while the system is maintained at high vacuum [6]. The high vacuum is necessary because the principle of operation of most mass spectrometers, such as quadrupole or time-of-flight types, are based on the kinetic energy of ions produced in an ionization chamber.…”

Section: Operational Princlplesmentioning

confidence: 99%

Hydrocarbon seep monitoring using in situ deep sea mass spectrometry

2005

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Absfmct -Hydrocarbon seep monitoring is a area applicable for new advances in mass spectrometry. Recent developments are allowing unprecedented levels of trace contaminant measurement in the deep-ocean. With funding from the U.S. National Science Foundation (NSF), our engineering design team constructed a new mass spectrometer-based in situ analysis system for work in the deep ocean environment over prolonged deployment periods.Our design goals were a depth capability of up to 4,000 m water depth (400 bars hydrostatic pressure) and autonomous operation for periods of up to sir months to a year, depending upon type of exteFa1 battery system used or other deployment circumstances, e.g., availability of a power cable or fuel cell power source. We chose a membrane introduction mass spectrometry (MIMS) sampling approach, which allows for dissolved gases and volatile organics introduction into the MS vacuum system. The MIMS approach and the hydrophobic, silicon-coated membrane chosen both draw upon our previous experience with this technology in the deep ocean. The membrane has been tested to 400 bars in a series of long-term hydrostatic pressure tests, which extends the 200-bar working depth rating of this membrane by a factor of 2.

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NEREUS: engineering concept for an underwater mass spectrometer

Cited by 26 publications

References 23 publications

Use of In‐Situ Methods

Use of In‐Situ Methods

The NEREUS in‐lake wireless/acoustic chemical data network

Hydrocarbon seep monitoring using in situ deep sea mass spectrometry

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