A Sentinel Sensor Network for Hydrogen Sensing
Open Access
- 20 February 2003
- Vol. 3 (3) , 69-82
- https://doi.org/10.3390/s30300069
Abstract
A wireless sensor network is presented for in-situ monitoring of atmospheric hydrogen concentration. The hydrogen sensor network consists of multiple sensor nodes, equipped with titania nanotube hydrogen sensors, distributed throughout the area of interest; each node is both sensor, and data-relay station that enables extended wide area monitoring without a consequent increase of node power and thus node size. The hydrogen sensor is fabricated from a sheet of highly ordered titania nanotubes, made by anodization of a titanium thick film, to which platinum electrodes are connected. The electrical resistance of the hydrogen sensor varies from 245 Ω at 500 ppm hydrogen, to 10.23 kΩ at 0 ppm hydrogen (pure nitrogen environment). The measured resistance is converted to voltage, 0.049 V at 500 ppm to 2.046 V at 0 ppm, by interface circuitry. The microcontroller of the sensor node digitizes the voltage and transmits the digital information, using intermediate nodes as relays, to a host node that downloads measurement data to a computer for display. This paper describes the design and operation of the sensor network, the titania nanotube hydrogen sensors with an apparent low level resolution of approximately 0.05 ppm, and their integration in one widely useful device.Keywords
This publication has 28 references indexed in Scilit:
- Breath Hydrogen Concentrations of Cats Given Commercial Canned and Extruded Diets Indicate Gastrointestinal Microbial Activity Vary with Diet TypeJournal of Nutrition, 2002
- Association Between Infantile Colic and Carbohydrate Malabsorption From Fruit Juices in InfancyPediatrics, 2002
- Irritable Bowel Syndrome and Nonspecific Diarrhea in Infancy and Childhood Relationship with Juice Carbohydrate MalabsorptionClinical Pediatrics, 2002
- Malabsorption of modified food starch (acetylated distarch phosphate) in normal infants and in 8–24-month-old toddlers with non-specific diarrhea, as influenced by sorbitol and fructoseActa Paediatrica, 2001
- Improvement of symptoms in infant colic following reduction of lactose load with lactaseJournal of Human Nutrition and Dietetics, 2001
- Fructose Malabsorption is Associated with Decreased Plasma TryptophanScandinavian Journal of Gastroenterology, 2001
- Chronic consumption of fresh but not heated yogurt improves breath-hydrogen status and short-chain fatty acid profiles: a controlled study in healthy men with or without lactose maldigestionThe American Journal of Clinical Nutrition, 2000
- Evaluation of The Rice Breath Hydrogen Test for Small Intestinal Bacterial OvergrowthAmerican Journal of Gastroenterology, 2000
- Diagnosis of small intestinal bacterial overgrowth in patients with cirrhosis of the liver: poor performance of the glucose breath hydrogen testJournal of Hepatology, 2000
- Monitoring and antibacterial treatment for postoperative bacterial overgrowth in Crohn's diseaseDiseases of the Colon & Rectum, 1999