A Flexible WO3-Based pH Sensor Array for 2-D pH Monitoring Using CPLoP Technique

2018 ◽  
Vol 39 (6) ◽  
pp. 881-884 ◽  
Author(s):  
Yu-Min Fu ◽  
Jia-Chyi Pan ◽  
Kun-Lin Tsou ◽  
Yu-Ting Cheng
Keyword(s):  
Sensor Array ◽  
Ph Monitoring ◽  
Ph Sensor

scholarly journals A low-cost flexible pH sensor array for wound assessment

2016 ◽  
Vol 229 ◽  
pp. 609-617 ◽  
Author(s):  
Rahim Rahimi ◽  
Manuel Ochoa ◽  
Tejasvi Parupudi ◽  
Xin Zhao ◽  
Iman K. Yazdi ◽  
...  
Keyword(s):  
Sensor Array ◽  
Low Cost ◽  
Ph Sensor ◽  
Wound Assessment

Full-range optical pH sensor array based on neural networks

2011 ◽  
Vol 97 (2) ◽  
pp. 225-233 ◽  
Author(s):  
S. Capel-Cuevas ◽  
M.P. Cuéllar ◽  
I. de Orbe-Payá ◽  
M.C. Pegalajar ◽  
L.F. Capitán-Vallvey
Keyword(s):  
Neural Networks ◽  
Sensor Array ◽  
Full Range ◽  
Ph Sensor ◽  
Optical Ph Sensor

scholarly journals Development of an IrO x micro pH sensor array on flexible polymer substrate

2008 ◽  
Author(s):  
Wen-Ding Huang ◽  
Jianqun Wang ◽  
Thermpon Ativanichayaphong ◽  
Mu Chiao ◽  
J. C. Chiao
Keyword(s):  
Sensor Array ◽  
Ph Sensor ◽  
Polymer Substrate ◽  
Flexible Polymer ◽  
Flexible Polymer Substrate

Wireless ISFET pH Sensor Network for Offshore Microalgae Cultivation

2012 ◽  
Author(s):  
John Malinowski ◽  
Patrick Wiley ◽  
Jonathan Trent ◽  
Emil J. Geiger
Keyword(s):  
Sensor Network ◽  
Wireless Network ◽  
Ph Monitoring ◽  
Ph Sensor ◽  
Environmental Parameters ◽  
Growth Conditions ◽  
Glass Electrode ◽  
Sensor Nodes ◽  
Transportation Fuel ◽  
The Many

Microalgae technology continues to show tremendous promise for becoming a major source of renewable transportation fuel in the coming decades. However, for microalgae to provide a significant fraction of the current US demand for fuel, their cultivation will be required on an enormous scale. One of the many formidable challenges that must be met to achieve this scale is the development of appropriate sensor networks to provide information about the growth conditions and the algae themselves. These sensors would monitor the heterogeneity of a) environmental parameters, such as pH, oxygen, and nutrient levels and b) algal characteristics such as size, oil content, and viability. Here we present a wireless sensor network to measure the local pH in NASA OMEGA project (Offshore Membrane Enclosures for Growing Algae). The pH is measured using Ion Sensitive Field Effect Transistor (ISFET) technology, which is more robust and has a faster response than traditional glass pH electrodes. A custom circuit drives the ISFET sensor and interfaces with an ANT wireless network system. The wireless network consists of a network hub which can service up to 8 sensor nodes and a series of relays to transmit the data to a PC. The data is logged with a custom LabVIEW program. In this work, we demonstrate operation of this network using a single ISFET pH sensor, one hub, and two relay units. The performance of the pH sensor network is evaluated and compared in parallel with an existing wired glass electrode based pH monitoring system at the NASA OMEGA project.

scholarly journals Valve-Actuator-Integrated Reference Electrode for an Ultra-Long-Life Rumen pH Sensor

Sensors ◽  
2020 ◽  
Vol 20 (5) ◽  
pp. 1249
Author(s):  
Shogo Higuchi ◽  
Hironao Okada ◽  
Seiichi Takamatsu ◽  
Toshihiro Itoh
Keyword(s):  
Ph Monitoring ◽  
Ph Sensor ◽  
Reference Electrode ◽  
Ph Sensors ◽  
Liquid Junction ◽  
Reference Electrodes ◽  
Potential Measurement ◽  
Rumen Ph ◽  
Long Life ◽  
Intermittent Measurement

We demonstrated a newly developed Ag/AgCl reference electrode- with a valve-actuator for two years or longer rumen pH monitoring. Previous studies on pH sensors reported that the short lifetime of Ag/AgCl reference electrodes is caused by an outflow of internal electrolyte. We introduced a valve-actuator into a liquid junction to reduce the outflow by intermittent measurement. The results indicated that the potential change when switching the liquid junction was less than 0.5 mV and its response time was less than 0.083 s. In the 24-h potential measurement with the valve-actuator-integrated reference electrode (VAIRE), the valve was actuated once every hour, and the standard deviation of the potential was 0.29 mV. The lifetime of the VAIRE was estimated at 2.0 years calculating from an electrolyte outflow, which is significantly longer than that of conventional reference electrodes. A pH sensor using the VAIRE was estimated to operate for 2.0 years with the pH error ≤0.1, which meets the requirement of cows’ rumen pH monitoring.

Sol-Gel Iridium Oxide-Based pH Sensor Array on Flexible Polyimide Substrate

2013 ◽  
Vol 13 (10) ◽  
pp. 3857-3864 ◽  
Author(s):  
Cuong M. Nguyen ◽  
Wen-Ding Huang ◽  
Smitha Rao ◽  
Hung Cao ◽  
Uday Tata ◽  
...  
Keyword(s):  
Sensor Array ◽  
Sol Gel ◽  
Ph Sensor ◽  
Iridium Oxide ◽  
Polyimide Substrate

Wireless Passive Sensor for Remote pH Monitoring

2011 ◽  
Vol 2 (1) ◽  
Author(s):  
Sharmistha Bhadra ◽  
Greg E. Bridges ◽  
Douglas J. Thomson ◽  
Michael S. Freund
Keyword(s):  
Resonant Frequency ◽  
Response Time ◽  
Dynamic Range ◽  
Ph Monitoring ◽  
Ph Sensor ◽  
Sensor Technology ◽  
Biomedical Sensing ◽  
Voltage Dependent ◽  
Solution Changes

In this paper we describe a wireless passive pH sensor for high-resolution remote pH monitoring. The sensor is based on a passive LC coil resonator whose resonant frequency is monitored remotely by measuring the change in impedance of an interrogator coil coupled to the sensor coil. The sensor resonator consists of an inductive coil connected in parallel with a voltage dependent capacitor and a pH combination electrode. Change in the electrode potential in response to variations of the pH of the solution changes the capacitance, and therefore the resonant frequency of the sensor. A linear response with a 0.1 pH resolution is achieved over a 4–10 pH dynamic range. The response time of the sensor is demonstrated to be less than 30 s and is limited by the response time of the pH combination electrode. The described sensor technology is suitable for long-term remote pH monitoring in numerous fields such as biomedical sensing, environmental monitoring, industrial and chemical processing, and structural health monitoring.

Detachable Flexible ISFET‐Based pH Sensor Array with a Flexible Connector

2020 ◽  
Vol 6 (10) ◽  
pp. 2000583
Author(s):  
Satoko Honda ◽  
Mao Shiomi ◽  
Takafumi Yamaguchi ◽  
Yusuke Fujita ◽  
Takayuki Arie ◽  
...  
Keyword(s):  
Sensor Array ◽  
Ph Sensor
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