Temperature compensation sensing method and device for cavity ring-down technology

Abstract

The invention relates to a temperature compensation sensing method and device for a cavity ring-down technology. The device comprises a broadband light source, a signal generator, a modulator, an optical isolator, a 2*1 fiber coupler, a transmission fiber, a temperature compensation fiber bragg grating (FBG1), a sensing fiber bragg grating (FBG2), a photoelectric converter, a PC machine and an oscilloscope, wherein a ring-down cavity is composed of the temperature compensation fiber bragg grating (FBG1) and the sensing fiber bragg grating (FBG2), and the sensing fiber bragg grating (FBG2) is asensing area; and the broadband light source has a certain spectral width, when the ambient temperature changes, the overlapping spectra of the two fiber bragg gratings move synchronously, and the broadband light source can ensure that the loss in the ring-down cavity before and after the drift is equal and can further ensure that the ring-down time is the same. Therefore, the change of the ring-down time is only caused by the to-be-performed measurement, the purpose of temperature compensation can be achieved, and the accurate measurement of the to-be-performed measurement can be achieved. The invention provides the temperature compensation sensing method and device for the cavity ring-down technology with the advantages of low cost, good stability and temperature effect elimination.

Description

technical field [0001] The invention belongs to the technical field of optical fiber sensing, and in particular relates to a temperature compensation sensing method and device of optical cavity ring down technology. Background technique [0002] Cavity ring-down spectroscopy technology originated in the 1960s. In 1961, Jackson first studied the absorption of the medium in the Fabry-Perot cavity. In 1974, Kastler confirmed that the intensity of the laser beam transmitted by the optical cavity is in the form of exponential decay of e. And the decay time constant is related to the losses in the cavity. Until 1988, when O'Keefe and Deacon measured the reflectivity of the high mirror, they found a series of absorption peaks, which were analyzed as forbidden transition lines of oxygen molecules. They realized that this technique could be used for spectroscopic measurement, and The term cavity ring-down spectroscopy (CRDS) was formally proposed in 1988, marking the birth of cavi...

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Problems solved by technology

[0004] In order to overcome the above-mentioned sensing system of fiber ring cavity ring-down spectroscopy (FLRDS), the problem that the influence of ambient temperature cannot be eliminated at the same time, and the physical quantity to be measured cannot be accurately measured

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