The NEREUS in‐lake wireless/acoustic chemical data network

Mueller

J. Am. Soc. Mass Spectrom.

2008

Self Cite

Two mass spectrometers (MS) are tested for the measurement of volatile substances, such as hydrocarbons and metabolic gases, in natural waters. KOALA is a backpackable MS operated from above the water surface, in which samples are pumped through a flow cell using a syringe. NEREUS is an underwater instrument hosted by an autonomous underwater vehicle (AUV) that is linked to a communications network to provide chemical data in real time. The mass analyzers of the two MS are nearly identical cycloids, and both use flat-plate membrane inlets. Testing took place in an eutrophic, thermally stratified lake exhibiting steep chemical gradients and significant levels of methane. KOALA provided rapid multispecies analysis of dissolved gases, with a detection limit for methane of 0.1 ppm (readily extendable to 0.01 ppm) and savings of time of at least a factor of 10 compared to that of conventional analysis. The AUV-mounted NEREUS additionally provided rapid spatial coverage and the capability of performing chemical surveys autonomously. Tests demonstrated the need for temperature control of a membrane inlet when steep thermal gradients are present in a water body, as well as the benefits of co-locating all sensors on the AUV to avoid interference from chemically different waters entering and draining from the free-flooding outer hull. The ability to measure dissolved volatiles provided by MS offers potential for complementarity with ionic sensors in the study of natural waters, such as in the case of the carbonate system. (J Am Soc Mass

Section: Control and Data Handling Softwarementioning

confidence: 99%

Section: Control and Data Handling Softwarementioning

confidence: 99%

Field testing of lake water chemistry with a portable and an AUV-based mass spectrometer

Mueller

J. Am. Soc. Mass Spectrom.

2008

Self Cite

“…The advent of membrane inlet technology has facilitated autonomous mass spectrometer operation for analysis of volatile halocarbons such as methane (Schluter and Gentz, 2008) and toluene (Short et al, 2006). Engineering progress has made the platforms robust for extended field deployment, including continuous operation at fixed buoys or on autonomous underwater vehicles for spatial mapping (Hemond et al, 2008). Though still in its infancy, autonomous mass spectrometry seems promising for ASTs directed at organic contaminants in aquatic systems.…”

Section: Automated Sensing Technologies In Microbial Ecologymentioning

confidence: 99%

Can the black box be cracked? The augmentation of microbial ecology by high-resolution, automated sensing technologies

et al. 2009

Automated sensing technologies, 'ASTs,' are tools that can monitor environmental or microbialrelated variables at increasingly high temporal resolution. Microbial ecologists are poised to use AST data to couple microbial structure, function and associated environmental observations on temporal scales pertinent to microbial processes. In the context of aquatic microbiology, we discuss three applications of ASTs: windows on the microbial world, adaptive sampling and adaptive management. We challenge microbial ecologists to push AST potential in helping to reveal relationships between microbial structure and function.

2014 IEEE Biennial Congress of Argentina (ARGENCON)

“…El monitoreo de los entornos subacuát y supervisión han atraído el interés científica [1,2]. La importancia que está reflejada en los avances que se logra comunicaciones, procesamiento de señal diversos transductores específicos a esta permiten la distribución de la informa subacuático [3,4].…”

Section: Introductionunclassified

Diseño de un enlace acústico de banda angosta para comunicaciones subacuáticas

Pires

Marziani

Alcoleas

et al. 2014

In this paper the design acoustic link using the model for a short presented. From the specifications of the li determine the optimum operating freq scheme and transmit power, information th perform a selection of the appropriate acou that purpose, a brief description of the cha briefly presented, the procedure is explain example is described using the acoustic t 200LM450 which will be used in a future im acoustic communication link.Resumen-En este trabajo se presen enlace acústico subacuático utilizando un m vertical corto. A partir de las especificacio enlace, es posible determinar la frec operación, el esquema de modulación transmisión; información que resultará úti una selección apropiada del transductor ac se describe brevemente el modelo del canal el procedimiento desarrollado y se brinda u al hacer el cálculo para la implementación acústico subacuático Prowave 200LM450 futura implementación del enlace.