Design enables remote chemical detection
Chemically-sensitive film deposited on end of optical fiber
Gas/vapor absorption by film changes optical reflectivity

Micromirror chemical sensors are constructed by coating the end of an optical fiber waveguide with a chemically-sensitive film that changes reflectivity upon exposure to a chemical of interest. This device enables remote monitoring of chemical concentration, operates in electrically-noisy environments, and does not constitute an ignition hazard. Applications include monitoring hydrogen levels in transformer oil to indicate breakdown and detecting oxidizing compounds in the Martian soil and atmosphere.

Applications:

Transformer breakdown (Harley)

Planetary chemical analysis (JPL)

Semiconductor tool diagnostics (SEMATECH)

Jet fuel & hydrogen leak monitoring (Technolink)

Design enables remote chemical detection

Chemically-sensitive film deposited on end of optical fiber

Gas/vapor absorption by film changes optical reflectivity