Maryland's Defense Patent Database

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Optical MEMS chemical sensor array

Patent image
NRL

A change in mass of a microbridge in a mass sensor can be sensed by applying a time-varying amplitude modulated electrostatic force to excite the microbridge into resonance at the frequency of amplitude modulation. An optical energy is then transmitted at a wavelength close to a resonant wavelength of a Fabry-Perot microcavity, which is formed by etching a movable reflective mirror into a region of the microbridge and by etching a fixed reflective minor in a region spaced apart from the microbridge. The two mirrors are interconnected by an optical waveguide. The movable mirror and fixed mirror reflect the optical energy to a receiver, and a change in the Fabry-Perot microcavity's reflectivity is interferometrically determined. The change in reflectivity indicates a change in the microbridge's resonant frequency due to increased mass of the microbridge resulting from sorption of a target chemical by a layer of chemoselective material deposited on the microbridge.

Inventors: 
Pruessner, Marcel W.; Stievater, Todd H.; Rabinovich, William S.
Patent Number: 
Technical domain: 
Sensors and Measurement
FIle Date: 
2010-03-23
Grant Date: 
2013-09-24
Grant time: 
1,281 days
Grant time percentile rank: 
23
Claim count percentile rank: 
5
Citations percentile rank: 
1
'Cited by' percentile rank: 
1
Assignee: 
US NAVY