| 摘要 |
In order to measure the refractive index of a medium (18), for example a liquid or a gas, this system comprises a waveguide (14) having a blazed Bragg grating (16), the spectral response of which depends on the refractive index of the medium, a light source (20) in order to make this light interact with the grating, means (22) fox the spectral analysis of the light which has interacted with the grating, means (26) for recovering the spectrum provided by the spectral analysis means and means (25) to correlate, from the recovered spectrum, the spectral response of the grating with one value of the refractive index of the medium.
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