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Feedback control method for spectrum of multicarrier tracking detection light interference type sensor

A technology of tracking detection and feedback control, which is applied in the fields of interference spectroscopy and spectrum investigation, can solve the problems of reducing signal power and low signal-to-noise ratio, so as to reduce signal power, improve signal-to-noise ratio, and improve optical signal-to-noise ratio Effect

Active Publication Date: 2022-04-05
SUN YAT SEN UNIV
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Problems solved by technology

[0005] In order to solve the limitations of the traditional single carrier for fast detection of optical interference sensors, and at the same time to solve the problem of low signal-to-noise ratio of multi-carrier spectral detection in the spectral detection of optical interference sensors, the present invention proposes a multi-carrier tracking detection light The feedback control method of the interference sensor spectrum, through the feedback filter modulation of the multi-carrier signal frequency position, reduces the signal power in the invalid signal area, increases the average power of the effective signal, and improves the signal-to-noise signal of the multi-carrier optical signal in the microcavity detection Ratio, further improving the quality of the signal

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  • Feedback control method for spectrum of multicarrier tracking detection light interference type sensor
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  • Feedback control method for spectrum of multicarrier tracking detection light interference type sensor

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Embodiment 1

[0044] In order to solve the limitations of the traditional single-carrier for fast detection of optical interference sensors, and to solve the problem of low signal-to-noise ratio of multi-carrier spectral detection in the spectral detection of optical interference sensors, based on the following ideas: single carrier with constant power The optical signal is used as the incident signal, and the multi-carrier electrical signal is introduced to drive the electro-optic modulator, and the single-carrier optical signal is modulated by the electro-optic modulator to form a multi-carrier optical signal composed of sub-carriers that are continuous in the time domain and discrete in the frequency domain, and the frequency positions are rectangular Window filter modulation reduces the signal power in the invalid signal area outside the window, and the modulated optical signal generates an absorption resonance peak in the optical interference sensor, thereby confirming the frequency posi...

Embodiment 2

[0063] In this embodiment, in the process of realizing the feedback control method of the multi-carrier tracking detection optical interference sensor spectrum described in Embodiment 1, the narrow linewidth laser is preferably used as the light source generator in Embodiment 1 for generating Single carrier optical signal.

Embodiment 3

[0065] The detection target optical interference sensor in the feedback control method of the multi-carrier tracking detection optical interference sensor spectrum described in embodiment 1 is a device with a microcavity structure, including a ring resonant cavity, an FP microcavity and a fiber Bragg grating FBG , in this embodiment, preferably a FP-type microcavity.

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Abstract

The invention provides a feedback control method for a spectrum of a multicarrier tracking and detecting light interference type sensor, which relates to the technical field of light sensing and light signal processing, takes a single-carrier light signal as an incident light signal with constant power, and generates a multicarrier light signal based on modulation of a single-carrier electric signal by an electro-optical modulator. The method comprises the following steps of: determining a frequency position corresponding to a resonance peak according to the frequency of an optical signal and a resonance peak absorption phenomenon generated by the optical signal in an optical interference type sensor, performing rectangular window filtering on the frequency position, modulating the frequency position into a partial multi-carrier optical signal with a window, and transmitting the partial multi-carrier optical signal to the optical interference type sensor to obtain a resonance peak falling in a window frequency range, the average power of the signal is increased, and the signal-to-noise ratio of the harmonic peak signal of the multicarrier optical signal in microcavity detection is improved. In the detection process, whether the frequency position corresponding to the harmonic peak deviates or not is tracked, feedback is conducted in time, and then rectangular window filtering is conducted so that the Lorentz curve of the harmonic peak can be kept to continuously fall within the multi-carrier optical signal window frequency range.

Description

technical field [0001] The invention relates to the technical field of optical sensing and optical signal processing, and more specifically, to a feedback control method for multi-carrier tracking and detection of light interference sensor spectra. Background technique [0002] At present, with the extensive research of researchers on the whispering gallery mode optical interference microcavity sensor, the mechanism of the interaction between the light field and the matter of the whispering gallery mode optical interference microcavity sensor has been deeply explored, which also makes the whispering gallery mode optical interference The microcavity sensor has become an excellent platform for ultra-high sensitivity optical sensing, and has important application value in high-precision sensing and detection. [0003] At present, the response of the optical interference sensor to the external ultrasonic signal is generally investigated by detecting the spectrum. The traditional...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01J3/45
Inventor 李朝晖冯耀明潘竞顺李强
Owner SUN YAT SEN UNIV