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Hydrogen sensor and pd film hydrogen sensing system

A sensor and hydrogen technology, applied in the field of sensor measurement, can solve problems such as difficult to achieve high-resolution stable measurement, environmental temperature disturbance, etc., and achieve the effect of overcoming the influence of environmental temperature disturbance, obvious price advantage, and low price

Inactive Publication Date: 2011-01-26
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The purpose of the present invention is to provide a hydrogen sensor and a palladium membrane hydrogen sensitive system, which overcomes the problems in the prior art that it is difficult to achieve high-resolution stable measurement due to factors such as light source fluctuations and optical fiber disturbances, and the problem that it is easily affected by ambient temperature disturbances , the measurement result is accurate and the temperature is strong, and the cost is low

Method used

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  • Hydrogen sensor and pd film hydrogen sensing system
  • Hydrogen sensor and pd film hydrogen sensing system
  • Hydrogen sensor and pd film hydrogen sensing system

Examples

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Embodiment 1

[0047] In this embodiment, the hollow tube can be a capillary tube, one of the preferred embodiments, such as figure 2 As shown, the hydrogen sensor includes: an introduction optical fiber 401, a reflection optical fiber 402, and a quartz capillary 403. The surface of the quartz capillary 403 is coated with a palladium or palladium alloy film 3 to realize the sensitivity of the quartz capillary 403 to hydrogen, and an introduction optical fiber with a good vertical end face 401 and the reflective fiber 402 are placed together into the quartz capillary 403 from both ends, and the CO 2 Laser or epoxy holds the two fibers together with the silica capillary 403, such as figure 2 As shown in the fixed point 407, the two opposite fiber end faces of the introduction fiber 401 and the reflection fiber 402 and the cavity of the silica capillary 403 together form an interference cavity 406, and the outer diameters of the introduction fiber 401 and the reflection fiber 402 are the same...

Embodiment 2

[0050] like image 3 It is a structural diagram of another embodiment of the hydrogen sensor, the structure of which is basically the same as the structure using the quartz capillary 403, the difference is that the capillary is specifically a palladium or palladium alloy capillary 404, which is sensitive to hydrogen, because the palladium or palladium alloy capillary 404 The surface itself has a palladium or palladium alloy film 3, therefore, the step of plating another layer of palladium or a palladium alloy film in Example 1 is omitted during fabrication.

Embodiment 3

[0052] The EFPI-based hydrogen sensor of the present invention is specifically a hollow-core photonic crystal fiber method-Perherder interference sensor, such as Figure 4 As shown, a section of hollow-core photonic crystal fiber 405 (PCF) is used as a Fabry-Perot cavity (interference cavity), the introduction fiber 401 and the reflection fiber 402 are both single-mode fibers, and the fiber fusion method is used at the fusion point 408. The hollow-core photonic crystal fiber 405 is spliced ​​with two single-mode fibers, and the two end faces opposite to the single-mode fiber where the hollow-core photonic crystal fiber 405 is spliced ​​form two reflection surfaces of the Fabry-Perot cavity, respectively. The surface of the hollow-core photonic crystal fiber 405 is coated with a certain thickness of palladium or palladium alloy film 3 to realize the sensitivity to hydrogen. In this embodiment, a palladium or palladium alloy film 3 with a certain thickness is plated on the surfa...

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Abstract

The invention relates to a hydrogen sensor and a Pd film hydrogen sensitive system, wherein the hydrogen sensor comprises introduction fiber, reflection fiber and a hollow tube, a surface of which has a Pd or Pb alloy film, the introduction fiber and the reflection fiber are respectively connected with two ends of a cavity of the hollow tube, two opposite fiber end faces are parallel and constitute an intervene cavity with the tube cavity. According to the Pd film hydrogen sensitive system, light with wide spectrum is transmitted to the introduction fiber of a hydrogen sensor, and intervene light generated on two opposite end of the introduction fiber and the reflection fiber is received, change of the length of the intervene cavity is determined through collecting intervene spectrum signals, further computing concentration of hydrogen. The invention overcomes problems that it is difficult to realize high resolution stable measurement due to light source fluctuation and optical fiber disturbance and the like, and is easy to be affected by temperature in prior art. Measurement result is correct and temperature is strong, cost is low.

Description

technical field [0001] The invention relates to the field of sensor measurement, in particular to an EFPI-based hydrogen sensor and a palladium membrane hydrogen sensitive system. Background technique [0002] At present, the sensors for measuring hydrogen concentration mainly include three types, namely: interferometric fiber optic hydrogen sensor (see Optical fiber hydrogen sensor, M.A.Butler, Applied Physics Letters, 1984, Vol.45(10), pp.1007-1009), microlens fiber optic hydrogen sensor (see Fiber optic sensor for hydrogen concentrations near the explosive limit, Butler Michael A., Journal of the Electrochemical Society, Vol. 138(9), 1991, pp. L46-L47) and Bragg grating-based fiber optic hydrogen sensor (See Pd-coated elastopic fiber optic optic bragg grating sensors for multiplexed hydrogen sensing, Boonsong S., Sensor and Actuators B, Vol. 60, 1999, pp. 27-34). [0003] Since metal palladium (Pd) absorbs hydrogen in a low partial pressure hydrogen environment to produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/84G01N21/00
Inventor 杨振张敏廖延彪田芊黎启胜张毅庄志
Owner TSINGHUA UNIV
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