Multi-parameter sensor and measurement system based on photonic crystal fiber

Abstract

The invention discloses a multi-parameter sensor based on a photonic crystal fiber. An input end and an output end of the sensor are respectively provided with an input coupler and an output coupler, an annular photonic crystal fiber cavity is formed in the way that a section of hollow photonic crystal fiber is connected between the two couplers, and the section of hollow photonic crystal fiber is used as a sensing head of the multi-parameter sensor. The invention also discloses a multi-parameter measurement system which comprises a signal acquiring, processing and displaying module and the multi-parameter sensor, the sensor is respectively connected with a light source and a photoelectric detector through the input coupler and the output coupler thereof, and the photoelectric detector is connected to the signal acquiring, processing and displaying module. The invention additionally provides a pressure measurement system comprising the multi-parameter measurement system and a pressurizing device arranged on the sensing head, and the pressuring device comprises a plenum chamber, a photonic crystal fiber clamp, a connector and the like. The multi-parameter sensor and measurement system of the invention has the advantages of simple and convenient operation, simplified structure, high measurement precision, easy miniaturization and standardization design and the like.

Description

technical field [0001] The invention relates to an optical sensor and its measurement system, in particular to an optical sensor capable of multi-parameter measurement and its measurement system. Background technique [0002] Cavity ring down (CRD, cavity ring down) spectroscopy is an ultra-high sensitivity detection absorption spectroscopy technology that emerged in the late 1980s, and is an effective method for measuring spectral absorption. The structure diagram of the measurement device of CRD spectroscopy is as follows: figure 1 As shown, when the initial light intensity of a beam emitted by light source 1 is I 0 When the laser light is incident on the cavity of length d formed by mirrors M1 and M2 with both reflectivity R, the laser will move repeatedly in the cavity due to the reflection of M1 and M2, and each repetition will have some energy Transmitted from M2. If the incident laser is a narrow-pulse laser and the pulse width is less than the time required for th...

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Problems solved by technology

[0025] However, the FLRD sensor composed of ordinary optical fibers has some obvious shortcomings in practical applications, such as the problem of temperature cross-sensitivity when used for pressure sensing, and the inability to achieve full optical fiber when used for gas absorption and liquid concentration measurements, etc., making it application is limited

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