A hand-held optical sensor for dissolved oxygen measurement

2003 ◽  
Vol 14 (6) ◽  
pp. 862-867 ◽  
Author(s):  
Dan Xiao ◽  
Yuanyao Mo ◽  
Martin M F Choi
Keyword(s):  
Dissolved Oxygen ◽  
Optical Sensor ◽  
Oxygen Measurement

scholarly journals The Influence of Optic and Polarographic Dissolved Oxygen Sensors Estimating the Volumetric Oxygen Mass Transfer Coefficient (KLa)

2016 ◽  
Vol 10 (8) ◽  
pp. 142 ◽  
Author(s):  
Gustavo Andrés Baquero-Rodríguez ◽  
Jaime A. Lara-Borrero
Keyword(s):  
Mass Transfer ◽  
Wastewater Treatment ◽  
Dissolved Oxygen ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Oxygen Transfer ◽  
Airflow Rate ◽  
Oxygen Probe ◽  
Aeration System ◽  
Oxygen Measurement

Aeration is usually the most energy intensive part of the wastewater treatment process. Optimizing the aeration system is essential for reducing energy costs. Field tests oriented to estimate parameters related to oxygen transfer are a common approach to compare aeration systems. The aim of this research is to assess the effect of dissolved oxygen probe lag on oxygen transfer parameter estimation. Experimental procedures regarding to process automation and control were applied to quantify dissolved oxygen probe lag. We have measured oxygen transfer in clean water, under a wide range of conditions (airflow rate, diffuser characteristics and diffuser density), with optic and polarographic sensors for dissolved oxygen measurement. The oxygen transfer was measured as per ASCE Standard procedures. Nonparametric statistical tests were used to compare the estimated volumetric mass transfer coefficient KLa with different sensors. According to the results, there is not significant influence of the probe lag (also known as time constant) or probe characteristics on the parameters used to assess oxygen transfer efficiency. This fact has great relevance in common practice of aerobic process for wastewater treatment because dissolved oxygen monitoring is used as an input for decision making related to the energy optimization in the aeration system. Findings from these tests contradict previous studies which claim that lag time in polarographic sensors for the dissolved oxygen measurement can bias estimate KLa.

Dissolved oxygen measurement with an improved amperometric cell

1986 ◽  
Vol 190 ◽  
pp. 275-279 ◽  
Author(s):  
Th.W. Rejda ◽  
J.D.N. Bunschoten ◽  
G.A.J. Kalis
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Measurement

An optical sensor for monitoring of dissolved oxygen based on phase detection

2013 ◽  
Vol 15 (5) ◽  
pp. 055502 ◽  
Author(s):  
Weiwei Feng ◽  
Na Zhou ◽  
Lingxin Chen ◽  
Bowei Li
Keyword(s):  
Dissolved Oxygen ◽  
Optical Sensor ◽  
Phase Detection

Steam sterilizable probes for dissolved oxygen measurement

2000 ◽  
Vol 67 (6) ◽  
pp. 645-656 ◽  
Author(s):  
Marvin J. Johnson ◽  
John Borkowski ◽  
Curt Engblom
Keyword(s):  
Dissolved Oxygen ◽  
Oxygen Measurement

Scanning optical sensor for the measurement of dissolved oxygen and BOD

1994 ◽  
Vol 21 (2) ◽  
pp. 143-149 ◽  
Author(s):  
Xiang-Ming Li ◽  
Fu-Chang Ruan ◽  
Wing-Yan Ng ◽  
Kwok-Yin Wong
Keyword(s):  
Dissolved Oxygen ◽  
Optical Sensor

scholarly journals BIOSENSOR SYSTEM DESIGN FOR DISSOLVED OXYGEN MEASUREMENT USING CURRENT MIRROR CIRCUIT

2019 ◽  
Vol 4 (2) ◽  
pp. 89-96
Author(s):  
Lazuardi Umar ◽  
Rahmondia N. Setiadi ◽  
Arfianti ◽  
Tetty M. Linda
Keyword(s):  
Dissolved Oxygen ◽  
Power Supply ◽  
Measurement Range ◽  
Current Mirror ◽  
High Noise ◽  
Biosensor System ◽  
Oxygen Measurement ◽  
Current Value ◽  
A Current ◽  
Lower Noise

It has been designed a biosensor system using the current mirror circuit. Biosensor system usually implements an amperometric circuit such as a trans-impedance to measure the current value that flows in the solution due to the dissolved oxygen in it. The trans-impedance circuit causing rather high noise, besides that the power supply used must be bipolar; otherwise the measurement range would be narrower. In this paper, a current mirror circuit is used to convert the flowing current in the solution. The current mirror circuit has a lower noise level, besides the power supply needed is just unipolar, and the measurement range much wider. By utilizing this circuit, the biosensor measurement system can be optimized with its achieved advantages

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