公开(公告)号：US20240167945A1

公开(公告)日：2024-05-23

申请号：US17789497

申请日：2021-05-13

Applicant: University of Science and Technology of China

Inventor： Shuiming Hu ,  Cunfeng Cheng ,  Yandong Tan

IPC: G01N21/31 ,  G01N21/03 ,  G01N21/39 ,  G01N21/63

CPC classification number: G01N21/3151 ,  G01N21/0303 ,  G01N21/0332 ,  G01N21/39 ,  G01N21/636

Abstract: A device and a spectrometer for quantitatively detecting carbon 14 isotope by a dual-wavelength method. Two mid-infrared lasers with different wavelengths are locked in an optical cavity of a sample chamber, to ensure the two lasers are collinear. The cavity length of the optical cavity is adjusted by a cavity length adjusting unit, to tune the mode frequency of the optical cavity, and then tune the frequencies of the two mid-infrared lasers, so that the frequencies of the two mid-infrared lasers match with different energy levels of the target isotope molecule simultaneously. After the frequencies of the mid-infrared lasers match with the energy levels of the target isotope molecule simultaneously, the target isotope molecule is excited by two mid-infrared lasers simultaneously, and the optical cavity output signal of the second mid-infrared laser passing through the optical cavity is detected.

公开(公告)号：US12163880B2

公开(公告)日：2024-12-10

申请号：US17789497

申请日：2021-05-13

Applicant: University of Science and Technology of China

Inventor： Shuiming Hu ,  Cunfeng Cheng ,  Yandong Tan

IPC: G01N21/39 ,  G01N21/03 ,  G01N21/31 ,  G01N21/63

Abstract: A device and a spectrometer for quantitatively detecting carbon 14 isotope by a dual-wavelength method. Two mid-infrared lasers with different wavelengths are locked in an optical cavity of a sample chamber, to ensure the two lasers are collinear. The cavity length of the optical cavity is adjusted by a cavity length adjusting unit, to tune the mode frequency of the optical cavity, and then tune the frequencies of the two mid-infrared lasers, so that the frequencies of the two mid-infrared lasers match with different energy levels of the target isotope molecule simultaneously. After the frequencies of the mid-infrared lasers match with the energy levels of the target isotope molecule simultaneously, the target isotope molecule is excited by two mid-infrared lasers simultaneously, and the optical cavity output signal of the second mid-infrared laser passing through the optical cavity is detected.

公开(公告)号：US20240175815A1

公开(公告)日：2024-05-30

申请号：US18511664

申请日：2023-11-16

Applicant: University of Science and Technology of China ,  Hefei National Laboratory

Inventor： Shuiming Hu ,  Cunfeng Cheng

IPC: G01N21/63 ,  G01J3/427 ,  G01N21/03 ,  G01N21/31 ,  G01N21/39

CPC classification number: G01N21/636 ,  G01J3/427 ,  G01N21/0332 ,  G01N21/3151 ,  G01N21/39 ,  G01N2021/391 ,  G01N2021/637

Abstract: An apparatus for quantitatively detecting isotopologue of carbon dioxide using dual-photon absorption, comprising a laser source, a laser frequency stabilizer, a sample chamber, a signal detector, and a signal analyzer. The sample chamber comprises an optical resonator and a piezoelectric ceramic. The laser source is configured to output a laser beam. The laser frequency stabilizer is configured to lock the laser beam to a mode frequency of the optical resonator. The piezoelectric ceramic is configured to adjust a length of the optical resonator to alter the mode frequency of the optical resonator to match energy levels of a target molecular isotopologue. The signal detector is configured to detect a transmission intensity of the light beam passing the optical resonator to obtain a dual-photon absorption signal. The signal analyzer is configured to analyze and process the dual-photon absorption signal to obtain a concentration of the target molecular isotopologue.