Use of an optical oxygen sensor to measure dissolved oxygen in seawater

Hasumoto, Hiroshi; Imazu, Tsuneo; Miura, Toshiaki; Kogure, Kazuhiro

doi:10.1007/s10872-006-0036-8

Cited by 33 publications

(16 citation statements)

References 11 publications

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“…Both sensors come in various shapes and sizes with a large range of O 2 (and thermal) response times, sensitivities, and potential for interferences, calibration drift, freezing impacts, etc. Sensors range from micro-electrodes and optical fibers (e.g., Hasumoto et al 2006; Kilimant et al 1995), to large planar sheet optodes for use in sediment studies (Larsen et al 2011), to the more standard sensors attached to rosette CTDs and other autonomous platforms. The Sea-Bird Electronics Inc. SBE-43 polarographic O 2 sensor is perhaps the most commonly used sensor on profiling CTDs due its relatively fast response, although the company also now offers their own version of an oxygen optode.…”

Section: Introductionmentioning

confidence: 99%

A calibration equation for oxygen optodes based on physical properties of the sensing foil

McNeil

D’Asaro

2014

Limnology & Ocean Methods

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We present a new physically based calibration equation for Aanderaa Inc. oxygen sensing optodes. We use the two site fluorescence quenching model of Demas et al. (1995) to describe the nonlinear Stern-Volmer response of the optode foil to oxygen partial pressure. Seven (minimally six) coefficients quantify foil response to oxygen and temperature; another quantifies response to hydrostatic pressure. These eight coefficients are related, theoretically, to basic physical properties of the foil. The equation provides a framework to study causes of variability and drift in optodes and to develop better quality control and handling procedures. We tested the equation using factory calibrations of 24 optode foils. When accurate multi-point calibration data are unavailable, two additional coefficients empirically correct the usually large differences observed between factory foil calibrations and post-factory laboratory/field calibrations; we cannot eliminate this major cause of uncertainty in optode calibrations. Excluding two potentially anomalous foils, the calibration equation fits 13 similarly calibrated foils, totaling 455 calibration points over 3 -40°C to -0.57 ± 1.48 mbar. Analysis of the resulting best fit coefficients reveals an underlying variability in optodes associated with variability in site 2 and site 1 Stern-Volmer coefficients of 32% and 20%, respectively. The fraction of unquenched fluorophores responding with the more accessible site 1 quenching characteristics varies by only 3%. The equation fits multi-point data for two optodes within manufacturer's specifications, the greater of ± 2.5 μmol . kg -1 and ± 1.5%. Detailed measurements of calibration changes over time will be required to understand the causes of optode drift.

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Section: Introductionmentioning

confidence: 99%

A calibration equation for oxygen optodes based on physical properties of the sensing foil

McNeil

D’Asaro

2014

Limnology & Ocean Methods

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“…Output of the probes is calibrated in the factory for temperature and proportionality with oxygen concentration. Such optical sensors have been shown to be very accurate and reliable (Glazer et al 2004;Hasumoto et al 2006;Papkovsky 2004). With a precision of ± 0.1 mg·L -1…”

Section: Measurement Principlementioning

confidence: 99%

“…Considering the accuracy of the oxygen probe, Hasumoto et al (2006) compared the dissolved oxygen concentrations in seawater samples both with an optical sensor and by the Winkler titration method and did not find any significant differences. Tengberg et al (2006) also evaluated the performance of a lifetime-based optode and compared it with data obtained by other methods.…”

Section: Sensitivity and Accuracy Of The Rdo Sensormentioning

confidence: 99%

A fully automated system for measurements of photosynthetic oxygen exchange under immersed conditions: an example of its use in Laminaria digitata (Heterokontophyta: Phaeophyceae)

Gévaert

Delebecq

et al. 2011

Limnology & Ocean Methods

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A new, fully‐automated, closed‐chamber system was developed for measuring photosynthetic activity in aquatic plants, algae, or corals during immersion. The performance of this system, which monitors oxygen exchange, was evaluated both in the laboratory and in situ under natural conditions using the seaweed Laminaria digitata. Intact, large individuals were placed inside the chamber and kept in place by a plastic grid in a transparent Perspex dome. The grid separated the upper incubation chamber containing the alga from the detectors that were situated in the lower chamber. Oxygen was measured using a novel method based on lifetime optical fluorescence sensor technology that provides an extremely stable and precise measurement of dissolved oxygen. The circulation and homogenization of the medium between the samples and the detectors in this closed system were provided by two pumps. The medium could be renewed by another pump that opened to the external ambient seawater and controlled by a solenoid valve. All the mechanics were driven by an electronic card that allowed choice of filling time, time of measurement, and time of medium renewal. This system provides a new tool to study, in detail, the photosynthesis of whole aquatic organisms under natural field conditions during immersion, combining high time‐resolution of oxygen exchange with a long temporal scale of in situ measurements. By allowing automatic and very accurate measurements without any intervention during monitoring, this system will be useful for estimating and comparing production of primary producers or for assessing the influence of environmental factors on production.

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“…In the underwater environment, marine biologists and oceanographers have also developed an array of measurement techniques for routine physical/biochemical parameters such as dissolved oxygen content, temperature, pH, salinity and conductivity. [1][2][3][4][5][6][7] The research challenge is to demonstrate that further advances in instrumentation and sensing techniques can provide improved capabilities for underwater detection of biologicals and chemicals, including toxic compounds or pollutants. With increasing concerns about port and harbor security, water quality, and identification of underwater objects, specific bio/chemical detection may also offer an additional tool to assist in determining if objects located by acoustic methods contain explosive compounds or are merely harmless debris.…”

Section: Underwater Sensingmentioning

confidence: 99%

Biosensor UUV payload for underwater detection

Kusterbeck

Charles

Melde

et al. 2010

Ocean Sensing and Monitoring II

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Increased emphasis on maritime domain awareness and port security has led to the development of unmanned underwater vehicles (UUVs) capable of extended missions. These systems rely most frequently on welldeveloped side scan sonar and acoustic methods to locate potential targets. The Naval Research Laboratory (NRL) is developing biosensors for underwater explosives detection that complement acoustic sensors and can be used as UUV payloads to monitor areas for port and harbor security or in detection of underwater unexploded ordnance (UXO) and biochemical threats. The prototype sensor has recently been demonstrated to detect explosives in seawater at trace levels when run in a continuous sampling mode. To overcome ongoing issues with sample preparation and facilitate rapid detection at trace levels in a marine environment, we have been developing new mesoporous materials for in-line preconcentration of explosives and other small molecules, engineering microfluidic components to improve the signal, and testing alternative signal transduction methods. Additional work is being done to optimize the optical components and sensor response time. Highlights of these current studies and our ongoing efforts to integrate the biosensor with existing detection technologies to reduce false positives are described. In addition, we present the results of field tests that demonstrate the prototype biosensor performance as a UUV payload.

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Use of an optical oxygen sensor to measure dissolved oxygen in seawater

Cited by 33 publications

References 11 publications

A calibration equation for oxygen optodes based on physical properties of the sensing foil

A calibration equation for oxygen optodes based on physical properties of the sensing foil

A fully automated system for measurements of photosynthetic oxygen exchange under immersed conditions: an example of its use in Laminaria digitata (Heterokontophyta: Phaeophyceae)

Biosensor UUV payload for underwater detection

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