Abstract: A photonic dosimeter accrues cumulative dose and includes: a substrate; a waveguide disposed on the substrate and that: receives a primary input light; transmits secondary input light from the primary input light to a dosimatrix; receives a secondary output light from the dosimatrix; and produces primary output light from the secondary output light; the dosimatrix disposed on the substrate and in optical communication with the waveguide and that: receives the secondary input light from the waveguide; produces the secondary output light that is communicated to the waveguide; and includes an active element that undergoes conversion from a prime state to a dosed state in response to receipt, by the active element, of a dose of radiation; and a cover layer disposed on waveguide and the dosimatrix.
Type:
Grant
Filed:
February 15, 2019
Date of Patent:
July 21, 2020
Assignee:
GOVERNMENT OF THE UNITED STATES OF AMERICA, AS RESPRESENTED BY THE SECRETARY OF COMMERCE
Inventors:
Ronald Tosh, Zeeshan Ahmed, Ryan P. Fitzgerald, Nikolai Klimov
Abstract: A highly compact, portable, pulsed-molecular-beam Fabry-Perot cavity Fourier transform microwave spectrometer which incorporates ultra-fine Fabry-Perot mirror surface finishes has been developed for trace gas analysis. The mirrors, having a surface finish of less than or equal to 0.25 microns rms, are coated with nickel and then with either gold or silver. In a further embodiment, one or more fixed-tuned Fabry-Perot cavities are incorporated within a single vacuum chamber to monitor one or more chemical species of interest.
Type:
Grant
Filed:
February 20, 1997
Date of Patent:
November 3, 1998
Assignee:
The United States of America as respresented by the Secretary of Commerce
Inventors:
Richard D. Suenram, Francis J. Lovas, Jens U. Grabow, Marlin D. Harmony, Igor Leonov, Andre Zuban