Passive absolute age and temperature history sensor

United States Patent

9,182,436
November 10, 2015
View the Complete Patent at the US Patent & Trademark Office
Two-Sensor System for Absolute Age and Temperature History
A passive sensor for historic age and temperature sensing, including a first member formed of a first material, the first material being either a metal or a semiconductor material and a second member formed of a second material, the second material being either a metal or a semiconductor material. A surface of the second member is in contact with a surface of the first member such that, over time, the second material of the second member diffuses into the first material of the first member. The rate of diffusion for the second material to diffuse into the first material depends on a temperature of the passive sensor. One of the electrical conductance, the electrical capacitance, the electrical inductance, the optical transmission, the optical reflectance, or the crystalline structure of the passive sensor depends on the amount of the second material that has diffused into the first member.
13/711,457
December 11, 2012
1/1;
G01K 1/00 (20060101); G01K 3/00 (20060101); G01K 1/02 (20060101); G01R 31/00 (20060101);
;374/100-106,137,141,170,45,130 ;116/216,217
STATEMENT OF GOVERNMENT INTEREST This invention was developed under Contract DE-AC04-94AL85000 between Sandia Corporation and the U.S. Department of Energy. The U.S. Government has certain rights in this invention.