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Locatable hydrogen measuring method based on single-photon counting

A single-photon counting and measurement method technology, which is applied in the direction of measuring devices, scattering characteristics measurement, and material analysis through optical means, can solve the problems of unsuitable concentration monitoring and small detection range, and achieve simple structure, convenient operation, and high efficiency. selective effect

Pending Publication Date: 2020-05-15
XIAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The Chinese patent with publication number CN205664848U proposes a single-end reflective long-period fiber grating sensor. The sensor proposed in this scheme has a probe-type structure, simple structure, small size, high sensitivity, and is sensitive to temperature, refractive index, liquid level, etc. The physical quantity is sensitive, but its detection range is too small, so it is not suitable for concentration monitoring in the case of hydrogen leakage

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  • Locatable hydrogen measuring method based on single-photon counting
  • Locatable hydrogen measuring method based on single-photon counting
  • Locatable hydrogen measuring method based on single-photon counting

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Embodiment 1

[0035] see Figure 1-6 , the present invention provides the following technical solutions: a single-photon counting-based positionable hydrogen measurement method, including fiber optic lidar, an acousto-optic modulator (AOM) to control the intensity of the laser beam and installed on the output of the acousto-optic modulator (AOM) An acousto-optic modulator (AOM) is injected into the sensing fiber through a circulator, and a single-photon photodetector (SPD) for receiving scattered light is installed at the output end of the circulator.

[0036] Specifically, fiber laser radar uses a narrow-linewidth single-frequency laser, and the linewidth of the laser can be adjusted according to the sensing distance requirements.

[0037] Specifically, the continuous light wave output by the single-frequency laser is modulated by an acousto-optic modulator (AOM) and converted into pulsed light.

[0038] Specifically, the laser wavelength is 600nm.

[0039] Specifically, the sensing fibe...

Embodiment 2

[0042] see Figure 1-6 , the present invention provides the following technical solutions: a single-photon counting-based positionable hydrogen measurement method, including fiber optic lidar, an acousto-optic modulator (AOM) to control the intensity of the laser beam and installed on the output of the acousto-optic modulator (AOM) An acousto-optic modulator (AOM) is injected into the sensing fiber through a circulator, and a single-photon photodetector (SPD) for receiving scattered light is installed at the output end of the circulator.

[0043] Specifically, fiber laser radar uses a narrow linewidth single-frequency laser.

[0044] Specifically, the continuous light wave output by the single-frequency laser is modulated by an acousto-optic modulator (AOM) and converted into pulsed light.

[0045] Specifically, the laser wavelength is 1600nm.

[0046] Specifically, the sensing fiber is coated with a sensitive film for detecting hydrogen sulfide, and the sensitive film is a ...

Embodiment 3

[0049] see Figure 1-6 , the present invention provides the following technical solutions: a single-photon counting-based positionable hydrogen measurement method, including fiber optic lidar, an acousto-optic modulator (AOM) to control the intensity of the laser beam and installed on the output of the acousto-optic modulator (AOM) An acousto-optic modulator (AOM) is injected into the sensing fiber through a circulator, and a single-photon photodetector (SPD) for receiving scattered light is installed at the output end of the circulator.

[0050] Specifically, fiber laser radar uses a narrow linewidth single-frequency laser.

[0051] Specifically, the continuous light wave output by the single-frequency laser is modulated by an acousto-optic modulator (AOM) and converted into pulsed light.

[0052] Specifically, the laser wavelength is 1100 nm.

[0053] Specifically, the sensing fiber is coated with a sensitive film for detecting chlorine gas, and the sensitive film is potassi...

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Abstract

The invention belongs to the technical field of new energy hydrogen safety monitoring, in particular to a positionable hydrogen measuring method based on single-photon counting. A fiber laser radar, an acoustic optical modulator (AOM) for controlling the intensity change of a laser beam, and a sensing fiber installed at the output end of the AOM are provided. The acoustic optical modulator (AOM) is injected into the sensing optical fiber through a circulator, and the output end of the circulator is provided with a single-photon photoelectric detector (SPD) used for receiving scattered light. The hydrogen concentration monitoring structure adopted by the invention can realize multi-point and multi-area hydrogen leakage and diffusion detection at the same time, the positionable function is realized, a detection mode of combining single-photon counting with lock-in amplification is adopted, noise detection can reach a thermal noise level; the sensor is a plastic optical fiber, and is simple in structure, low in cost and convenient to operate, and is uncharged, intrinsically safe and particularly suitable for flammable and combustible environments of hydrogen detection,

Description

technical field [0001] The invention belongs to the technical field of new energy hydrogen safety monitoring, and in particular relates to a positionable hydrogen measurement method based on single photon counting. Background technique [0002] In my country's primary energy production, coal accounts for 70%, oil accounts for 8%, natural gas accounts for 5%, and new energy accounts for 17%. China's natural endowment conditions, which are rich in coal resources but relatively insufficient in oil and gas, determine that energy production and consumption must have Chinese characteristics , which constitutes the characteristics of China's energy structure industry of "one large and three small" (coal is large, oil, natural gas, and new energy are small). [0003] Hydrogen energy is the cleanest new energy. Therefore, the development of the hydrogen industry is to optimize the energy structure. The development of the global hydrogen industry has begun to take shape. Hydrogen produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/49
CPCG01N21/49G01N2021/4709
Inventor 李俊邓军王伟峰马天翟小伟
Owner XIAN UNIV OF SCI & TECH
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