Intensity detection gas sensor based on fp interferometer cascade sensitization and photothermal technology
A technology of gas sensor and photoelectric detector, which is applied in the field of gas sensor and intensity detection gas sensor, can solve the problem that the sensitivity of fiber optic gas sensor needs to be improved, and achieve the effect of improving gas measurement sensitivity and high anti-interference ability
Active Publication Date: 2021-08-24
HARBIN UNIV OF SCI & TECH
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Problems solved by technology
In view of the above unique advantages, it has been favored by many scientific researchers, and its status in practical applications has gradually improved, but the sensitivity of existing fiber optic gas sensors still needs to be improved
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Embodiment 1
[0024] Embodiment 1: see Figure 1 to Figure 6 , the intensity detection type gas sensor based on FP interferometer cascade sensitization and photothermal technology in this embodiment,
[0025] Including detection laser, isolator I, pump laser, isolator II, circulator I, circulator II, filter, photodetector, data acquisition card, computer, FP interferometer I and FP interferometer II;
[0026] The detection laser, the isolator I, and the coupler are connected in sequence, the pump laser, the isolator II, and the coupler are connected in sequence, the coupler circulator I, and the circulator II are connected in sequence, and the FP interferometer I is connected to the circulator I, The FP interferometer II is connected to the circulator II, and the circulator II, filter, photodetector, data acquisition card, and computer are connected in sequence.
[0027] Among them, FP Interferometer I.
[0028] The two ends of the hollow-core photonic crystal fiber (HC-PCF) with a length...
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Abstract
The invention relates to an intensity detection type gas sensor based on FP interferometer cascade sensitization and photothermal technology, belonging to the technical field of gas concentration measurement. The invention solves the problem that the sensitivity of the existing optical fiber gas sensor needs to be improved. Innovation point: the detection laser, isolator I, and coupler are connected in sequence, the pump laser, isolator II, and coupler are connected in sequence, the coupler circulator I, and circulator II are connected in sequence, and the FP interferometer I is connected to the circulator On the I, the FP interferometer II is connected to the circulator II, and the circulator II, the filter, the photodetector, the data acquisition card, and the computer are connected in sequence. The invention cascades two FP interferometers to generate a vernier effect, uses the sensitivity enhancement characteristic of the vernier effect to improve the gas measurement sensitivity, and improves the gas measurement sensitivity by 1-2 orders of magnitude.
Description
technical field [0001] The invention relates to a gas sensor, in particular to an intensity detection type gas sensor based on FP interferometer cascade sensitization and photothermal technology, belonging to the technical field of gas concentration measurement. Background technique [0002] For the measurement of gas concentration, the spatial spectral absorption method is usually used for measurement. In order to improve the sensitivity, a large-volume gas chamber is required, resulting in a bulky instrument and difficult to achieve online detection. [0003] Optical fiber gas sensing technology is a rising star in gas detection technology, and it came into people's field of vision only in the 1970s. The optical fiber gas sensor has a small transmission power loss and is suitable for long-distance measurement. It has strong advantages in harsh environments such as high temperature and high pressure. It has a simple structure, high sensitivity, and is stable and reliable. ...
Claims
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IPC IPC(8): G01N21/31G01N21/17G01N21/45G01N21/01
CPCG01N21/01G01N21/171G01N21/31G01N21/45G01N2021/458
Inventor 杨玉强姜久兴李林军
Owner HARBIN UNIV OF SCI & TECH