Apparatus for quantitatively detecting isotopologue of carbon dioxide using dual-photon absorption and spectrometer

Patent metadata

Field	Value
Publication number	US-2024175815-A1
Application number	US-202318511664-A
Country	US
Kind code	A1
Filing date	Nov 16, 2023
Priority date	Nov 24, 2022
Publication date	May 30, 2024
Grant date	—

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.

First claim

1 . 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, wherein: 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; and the signal analyzer is configured to analyze and process the dual-photon absorption signal to obtain a concentration of the target molecular isotopologue.

2 . The apparatus according to claim 1 , wherein the laser beam is a continuous infrared laser beam, and a power of the laser beam is greater than 100 mW.

3 . The apparatus according to claim 1 , wherein a fineness of the optical resonator is higher than 60000.

4 . The apparatus according to claim 1 , wherein:
the energy levels of the target molecular isotopologue comprise energy levels of dual-photon absorption, and an energy level representing single-photon absorption is between the energy levels of dual-photon absorption.

5 . The apparatus according to claim 4 , wherein energy of a photon having the mode frequency matching the energy levels of the target molecular isotopologue is equal to a half of an energy difference between the energy levels of the target molecular isotopologue.

6 . The apparatus according to claim 1 , wherein fluctuations of temperature of the optical resonator are less than 10 mK.

7 . The apparatus according to claim 1 , wherein the sample chamber further comprises:
a temperature controller, configured to control temperature of the optical resonator.

8 . The apparatus according to claim 1 , wherein:
the signal detector comprises a detector and a signal amplifier which are integrated; the detector is configured to detect the transmission intensity of the light beam passing the optical resonator to obtain the dual-photon absorption signal; the signal amplifier is configured to amplify the obtained dual-photon absorption signal.

9 . The apparatus according to claim 1 , wherein the signal analyzer is configured to:
invoke a signal processing program to analyze and process the dual-photon absorption signal to obtain the concentration of the target molecular isotopologue, and display the concentration of the target molecular isotopologue via an interactive interface.

10 . A spectrometer, comprising the apparatus according to claim 1 .

Assignees

• Univ Science & Technology China
• Hefei Nat Laboratory

Inventors

• Hu Shuiming
• Cheng Cunfeng

Classifications

• G01N21/636 Primary

  using an arrangement of pump beam and probe beam; using the measurement of optical non-linear properties; (non-linear optics per se G02F1/35) · CPC title

• G01J3/427

  Dual wavelengths spectrometry · CPC title

• G01N21/0332

  with temperature control (control of temperature G05D23/00; cryostats F17C3/08) · CPC title

• G01N21/3151

  using two sources of radiation of different wavelengths (G01N21/33 - G01N21/39 take precedence) · CPC title

• G01N21/39 Primary

  using tunable lasers · CPC title