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    • 16. 发明申请
    • METHOD AND SYSTEM FOR INTERROGATING A BIREFRINGENT FIBER BRAGG GRATING SENSOR, EMPLOYING HETERODYNE OPTICAL DETECTION
    • WO2022137027A1
    • 2022-06-30
    • PCT/IB2021/061767
    • 2021-12-15
    • BREMBO S.P.A.SCUOLA SUPERIORE DI STUDI UNIVERSITARI E DI PERFEZIONAMENTO SANT'ANNA
    • FARALLI, StefanoMUANENDA, Yonas SeifuDI PASQUALE, FabrizioTOZZETTI, LorenzoCAMOZZI, Francesco
    • G01D5/353
    • A method for interrogating at least one sensor of the birefringent Fiber Bragg Grating type, Bi-FBG is described. Such a method firstly comprises the steps of illuminating said at least one sensor of the birefringent Fiber Bragg Grating type, Bi-FBG, with a broadband optical excitation radiation OA; and conveying the reflected optical spectrum OR from the at least one sensor of the birefringent Fiber Bragg Grating type, Bi-FBG, to a detection photonic integrated circuit PIC. The method then includes separating a first component of the aforesaid reflected optical spectrum OR1, characterized by a first optical polarization generated by the birefringence and centered around a first frequency ω1, from a second component of the aforesaid reflected optical spectrum OR2, characterized by a second optical polarization generated by the birefringence and centered around a second frequency ω2, by means of a polarization optical beam splitter comprised in the detection photonic integrated circuit PIC. The method further comprises the steps of providing the aforesaid broadband optical excitation OA to the detection photonic integrated circuit PIC; and obtaining at least two narrowband optical signals (L01, L02), on the basis of at least one narrowband optical filtering of the aforesaid broadband optical excitation radiation OA carried out in the detection photonic integrated circuit PIC. The aforesaid at least two narrowband optical signals (L01, L02) comprise a first local oscillator optical signal L01, centered around a first local oscillator frequency ooi_oi, and a second local oscillator optical signal L02, centered around a second local oscillator frequency ωL02. The method then includes providing the aforesaid first component of the reflected optical spectrum OR1 and said first local oscillator optical signal L01 to first optical heterodyne detection means, integrated in the detection photonic integrated circuit PIC, to carry out a heterodyne detection and obtain a first electrical signal E1 at a first intermediate frequency ωIFs, equal to the difference between the first local oscillator frequency ωL01 and said first frequency ω1 of the first component of the reflected optical spectrum OR1. Similarly, the method further includes providing the aforesaid second component of the reflected optical spectrum OR2 and the aforesaid second local oscillator optical signal L02 to second optical heterodyne detection means, also integrated into said detection photonic integrated circuit PIC, to carry out a heterodyne detection and obtain a second electrical signal E2 at a second intermediate frequency ωIFf, equal to the difference between the second local oscillator frequency GULO2 and the aforesaid second frequency ω2 of the second component of the reflected optical spectrum OR2. The method finally comprises the steps of determining the first intermediate frequency ωIFs, indicative of a first wavelength shift Δλ1 of the first component of the reflected optical spectrum OR1, having the first polarization, with respect to a first reference wavelength λί of the Bragg grating of the sensor of the optical fiber sensor, Bi-FBG; and further determining the second intermediate frequency indicative of a second wavelength shift Δλ2 of the second component of the reflected optical spectrum OR2, having the second polarization, with respect to a second reference wavelength λί of the Bragg grating of the optical fiber sensor, Bi-FBG. The aforesaid first wavelength shift Δλ1 and second wavelength shift Δλ2 are representative of at least one physical magnitude measured by the optical fiber sensor Bi-FBG. Furthermore, a corresponding system for interrogating at least one sensor of the birefringent Fiber Bragg Grating, Bi-FBG, is described. Finally, a method and system are described for determining at least two physical magnitudes detectable by a sensor of the birefringent Fiber Bragg Grating, Bi-FBG, type, employing the aforementioned method of interrogating.
    • 17. 发明申请
    • A DEVICE FOR ENDOSCOPICALLY DELIVERING A THERAPEUTIC SUBSTANCE
    • WO2022074632A1
    • 2022-04-14
    • PCT/IB2021/059279
    • 2021-10-11
    • SCUOLA SUPERIORE DI STUDI UNIVERSITARI E DI PERFEZIONAMENTO SANT'ANNA
    • RICOTTI, LeonardoVANNOZZI, LorenzoMAZZOCCHI, TommasoSILIBERTO, AlessioGUARNERA, Daniele
    • A61B17/34A61M25/01A61M25/00
    • A device for endoscopically delivering at least one therapeutic substance includes a cannula (10) defining at least one extrusion channel (11) and comprises a proximal portion (19), a flexible distal portion (15) having an extrusion mouth (16), and a substantially rigid intermediate portion (17) between the flexible distal portion (15) and the proximal portion (19). The proximal portion (19) is configured to feed and push a therapeutic substance into the extrusion channel (11), so that the latter can pass through the extrusion channel (11) flowing through the intermediate portion (17) and through the flexible distal portion (15) and can exit from the extrusion mouth (16). The device also comprises at least one actuation cable (50, 50', 50") having a proximal end (59) operable at the proximal portion (19) and a distal end (55) connected to the flexible distal portion (15) at the extrusion mouth (16), and configured to pull the flexible distal portion (15) with a force transversal to the extrusion channel (11), bringing the flexible distal portion (15) from an undeformed conformation (A) to a deformed conformation (B). According to the invention, the substantially rigid intermediate portion (17) has a distal rigid edge (54) from which the flexible distal portion protrudes (15), and in which the distal rigid edge (54) has a passageway exit (53) of a passageway (56) for the actuation cable (50), the distal rigid edge (54) and the passageway exit (53) of the passageway arranged in such a way that only the flexible distal portion (15) of the cannula (10) can be brought, by the actuation cable (50, 50', 50"), from the undeformed conformation (A) to the deformed conformation (B) while the intermediate portion (17) remains undeformed.