G - Physics – 01 – N
Patent
G - Physics
01
N
G01N 21/17 (2006.01) G01D 5/353 (2006.01) G01J 3/42 (2006.01) G01N 21/47 (2006.01) G01N 21/55 (2006.01) G01N 21/77 (2006.01)
Patent
CA 2358268
Light from a light source (1) is fed into a resonator comprising an resonator fiber (3) and highly reflective couplers (4, 5). Light coupled out of the resonator fiber (3) is detected by a light sensor (7). The resonator is built such that its losses depend on a physical parameter to be measured. The light fed to the light source is switched on and off in step-like manner and the corresponding build-up or decay of the light de- tector signal is used to determine the time constant of the resonator and therefrom the physical parameter. It is found that, even when light of a comparatively broad bandwidth is used, accurate measurements of the time con- stant are possible.
Romann Albert
von Lerber Tuomo
Eidgenossische Technische Hochschule Zurich
Robic
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