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Optical high acidity sensor

United States Patent

5,650,331
July 22, 1997
View the Complete Patent at the US Patent & Trademark Office
Los Alamos National Laboratory - Visit the Technology Transfer Division Website
An apparatus and method for determining acid concentrations in solutions having acid concentrations of from about 0.1 Molar to about 16 Molar is disclosed. The apparatus includes a chamber for interrogation of the sample solution, a fiber optic light source for passing light transversely through the chamber, a fiber optic collector for receiving the collimated light after transmission through the chamber, a coating of an acid resistant polymeric composition upon at least one fiber end or lens, the polymeric composition in contact with the sample solution within the chamber and having a detectable response to acid concentrations within the range of from about 0.1 Molar to about 16 Molar, a measurer for the response of the polymeric composition in contact with the sample solution, and, a comparer of the measured response to predetermined standards whereby the acid molarity of the sample solution within the chamber can be determined. Preferably, a first lens is attached to the end of the fiber optic light source, the first lens adapted to collimate light from the fiber optic light source, and a second lens is attached to the end of the fiber optic collector for focusing the collimated light after transmission through the chamber.
Jorgensen; Betty S. (Jemez Springs, NM), Nekimken; Howard L. (Los Alamos, NM), Carey; W. Patrick (Lynnwood, WA), O'Rourke; Patrick E. (Martinez, GA)
The United States of America as represented by the United States (Washington, DC)
07/ 770,388
October 3, 1991
FIELD OF THE INVENTION The present invention relates to the field of sensors, and more particularly, to the field of fiber optic sensors for the determination of acid concentrations within solutions. This invention is the result of a contract with the Department of Energy (Contract No. W-7405-ENG-36).