公开(公告)号：WO2021117041A1

公开(公告)日：2021-06-17

申请号：PCT/IL2020/051273

申请日：2020-12-09

Applicant: OPTIQGAIN LTD.

Inventor： ALON, Ram ,  WOLF, Israel

IPC: G01N21/65 ,  G01J3/0205 ,  G01J3/0218 ,  G01J3/44 ,  G01N2021/651 ,  G01N2021/655 ,  G01N2201/088 ,  G02B6/02328

Abstract: A stimulated Raman scattering spectrometer for real-time, high- resolution molecular analysis of gases is based on two hollow-core fibres (420, 450) illuminated by a single high-power, short-pulse laser pump. The first fibre (420) is prefilled with high-concentration target gases. Interaction of each target gas inside the first fibre (420), with the laser pump, generates Raman signals corresponding to the target gases. The combined beam of the Raman signals and the pump laser beam is directed into the second fibre (450) containing the measured target gases. Interaction of each target gas with the combined beam generates the Stimulated Raman Growth, i.e., amplification of the Raman signal, which is proportional to the corresponding target gas concentration. A receiver subsystem (30) receives the beam from the second fibre (450), spectrally separates it to wavelengths corresponding to each target gas, extracts the Stimulated Raman Growth value corresponding to each target gas and calculates the concentration of each target gas.

公开(公告)号：WO2022212535A1

公开(公告)日：2022-10-06

申请号：PCT/US2022/022588

申请日：2022-03-30

Applicant: SAUDI ARABIAN OIL COMPANY ,  ARAMCO SERVICES COMPANY

Inventor： CAVAZOS SEPULVEDA, Adrian, Cesar ,  SAN ROMAN ALERIGI, Damian, Pablo

IPC: G01N21/552 ,  G01N21/35 ,  G01N21/45 ,  E21B49/0875 ,  G01N2021/3595 ,  G01N2021/458 ,  G01N2201/082 ,  G01N2201/088 ,  G01N33/54373

Abstract: A sensing system (16) for monitoring a composition of a downhole fluid (15) in a well (16), where the sensing system (16) includes: a light source (41), a waveguide (21), an evanescent field sensing element (22) that is indirect contact with a downhole fluid (15), and a detector (25, 43, 53, 63). The light source (41) is operable for emitting a beam and includes a frequency comb generator (42) configured to modify at least a portion of the beam into a sensing comb beam. The evanescent field sensing element (22) provides attenuated internal reflection of the sensing comb beam at the interface between the evanescent field sensing element (22) and the downhole fluid (15), and the portion of the sensing comb beam interacts with the downhole fluid (15) to form at least a portion of an interacted beam. The detector (25, 43, 53, 63) obtains a spectral distribution of the interacted beam.