Abstract: The present invention relates to a energy conversion device (100) configured to convert a light signal into an electrical signal, comprising: an actuator element (50), substantially planar, having at least one activatable portion (30), said activatable portion comprising a photomobile polymeric material; a transducer element (60), substantially planar, having at least a portion of piezoelectric material; wherein said actuator element (50) is coupled to said transducer element (60) so that, at a light beam incident on said photomobile polymeric material, a movement of said transducer element (60) is activated through a movement of said activatable portion (30), said movement of said transducer element (60) providing the generation of a potential difference at the terminal ends of said portion of piezoelectric material. The present invention also relates to a method of production of the aforesaid device.

Abstract: A method for measuring the refractive index of a material with Bragg gratings includes the emission of a collimated radiation beam (9) from a radiation source (4) with a large spectrum and orientation thereof along a direction normal to the material (2) to be examined, the propagation of the collimated radiation beam (9) entering the material (2), then a Bragg diffraction grating (3) that is obliquely placed to the direction of the collimated radiation beam (9), and again the material (2), the subjection to spectral analysis of the collimated radiation beam exiting the material (2), the grating (3) producing a minimum in the spectrum subjected to the spectral analysis in accordance with Bragg's law, and the calculation of the refractive index of the material (2) from the measure of the wavelength corresponding to the minimum in thus spectrum. A relevant apparatus is described.

Abstract: A method for measuring the refractive index of a material with Bragg gratings includes the emission of a collimated radiation beam (9) from a radiation source (4) with a large spectrum and orientation thereof along a direction normal to the material (2) to be examined, the propagation of the collimated radiation beam (9) entering the material (2), then a Bragg diffraction grating (3) that is obliquely placed to the direction of the collimated radiation beam (9), and again the material (2), the subjection to spectral analysis of the collimated radiation beam exiting the material (2), the grating (3) producing a minimum in the spectrum subjected to the spectral analysis in accordance with Bragg's law, and the calculation of the refractive index of the material (2) from the measure of the wavelength corresponding to the minimum in thus spectrum. A relevant apparatus is described.