The NTIS website and supporting ordering systems are undergoing a major upgrade from 8PM on September 25th through approximately October 6. During that time, much of the functionality, including subscription and product ordering, shipping, etc., will not be available. You may call NTIS at 1-800-553-6847 or (703) 605-6000 to place an order but you should expect delayed shipment. Please do NOT include credit card numbers in any email you might send NTIS.
Documents in the NTIS Technical Reports collection are the results of federally funded research. They are directly submitted to or collected by NTIS from Federal agencies for permanent accessibility to industry, academia and the public.  Before purchasing from NTIS, you may want to check for free access from (1) the issuing organization's website; (2) the U.S. Government Printing Office's Federal Digital System website; (3) the federal government Internet portal; or (4) a web search conducted using a commercial search engine such as
Accession Number ADA571548
Title Development of an Integrated ISFET pH Sensor for High Pressure Applications in the Deep-Sea.
Publication Date Sep 2012
Media Count 7p
Personal Author K. S. Johnson S. C. Riser T. R. Martz Y. Gu
Abstract The long-term goals of this project are to enable observations of pH in the ocean at depths to 2000 m using sensors deployed on autonomous platforms, particularly profiling floats of the type used in the Argo array. These systems will enable robust, basin-scale observations of changing pH driven by natural and anthropogenic processes. Develop a robust and stable pH sensor for deep-sea applications that is based on the Honeywell Durafet Ion Sensitive Field Effect Transistor (ISFET). The sensor should operate to depths of at least 2000 m. It should have a precision of 0.001 pH and a stability of 0.005 pH over periods up to 5 years throughout the oceanic temperature and salinity range. Capabilities will be demonstrated with deployments on four Webb Research Apex profiling floats.
Keywords Deep oceans
Field effect transistors
High pressure
Hot(Hawaii ocean time series)
Isfet(Ion sensitive field effect transistor)
Ocean acidification
Ph sensors
Ph(Potential hydrogen)
Time series analysis

Source Agency Non Paid ADAS
NTIS Subject Category 99F - Physical & Theoretical Chemistry
47C - Physical & Chemical Oceanography
49 - Electrotechnology
Corporate Author Monterey Bay Aquarium Research Inst., Moss Landing, CA.
Document Type Technical report
Title Note Annual rept.
NTIS Issue Number 1316
Contract Number N00014-10-1-0206

Science and Technology Highlights

See a sampling of the latest scientific, technical and engineering information from NTIS in the NTIS Technical Reports Newsletter

Acrobat Reader Mobile    Acrobat Reader