Microcavity optical frequency comb gas concentration sensing measurement method

Abstract

The invention relates to a microcavity optical frequency comb gas concentration sensing measurement method. The method comprises the following steps: (1) collecting training data; (2) training a DNN neural network sensing data detection model; (3) collecting test data; (4), testing a DNN neural network sensing data detection model; the optical frequency comb sensing method for researching microcavity enhancement is provided by combining the characteristic of ultrahigh sensitivity of microcavity sensing and the advantage of broadband high frequency resolution of an optical frequency comb spectrum; meanwhile, multi-mode sensing information is effectively fused with the help of a machine learning intelligent algorithm, and sensing measurement is achieved; according to the method, gas is sampled and introduced into the microcavity optical frequency comb to enhance interaction between light and substances, the sensing sensitivity is improved, sensing measurement is carried out by adopting methods such as machine learning according to a complex nonlinear sensing mechanism, sensing information of comb teeth of a plurality of frequency combs is integrated, and the sensing sensitivity and the noise tolerance capability are improved.

Description

Technical field [0001] The present invention belongs to the field of echo wall optical microcavity sensing technology, and more particularly to a microcavity optical comb gas concentration sensing measurement method. Background technique [0002] The optical comb technology has been revolutionized for spectroscopy, especially the molecular spectroscopy. A optical frequency comb can illuminate samples with high frequency stability broadband laser lines, each of which can be obtained by low probe array techniques, and this method can obtain high measurement accuracy of the normal spectrometer. In this way, it can be detected in any small change in the spectrum, such as molecular vibration harmonics. A better detection effect can be obtained for the frequency combing source of the medium infrared, as the molecular vibration feature is more intense. In the middle of the infrared optical frequency comb has been confirmed to detect a gaseous concentration of billion. [0003] Recently,...

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Problems solved by technology

[0005] In summary, microcavity optical frequency comb measurement has the advantages of broadband and high frequency resolution, but it is currently limited to measuring the absorption spectrum of gas samples, and the measurement method is monotonous; in traditional microcavity sensing, the sample interacts with the microcavity mode field. Has high sensitivity, but only limited to a single or a limited number of modes for detection

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