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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 the problems such as the influence of ambient temperature disturbance and the difficulty of achieving high-resolution stable measurement, and achieve the effect of overcoming the influence of ambient temperature disturbance, obvious price advantage, and low price

Inactive Publication Date: 2009-06-10
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] The hollow tube in this embodiment can adopt a capillary tube, wherein a preferred embodiment, 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 reflective optical fiber 402 are put into the quartz capillary 403 together from both ends, using CO 2 Laser or epoxy fixes the two optical fibers together with the quartz capillary 403, such as figure 2 As shown in the fixed point 407, the two opposite fiber end faces of the leading optical fiber 401 and the reflecting fiber 402 together with the lumen of the quartz capillary 403 form an interference cavity 406, and the outer diameters of the leading optical fiber 401 and the reflecting fiber 402 ...

Embodiment 2

[0050] like image 3 It is a structural diagram of another embodiment of the hydrogen sensor, and its structure is basically the same as that using a 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 needing to coat a layer of palladium or palladium alloy film in Example 1 is omitted during manufacture.

Embodiment 3

[0052] The hydrogen sensor based on EFPI of the present invention is specifically based on the hollow-core photonic crystal fiber method-Perco 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), and the leading optical fiber 401 and the reflecting optical fiber 402 are both single-mode optical fibers. The hollow-core photonic crystal fiber 405 is fused with two single-mode fibers, and the two opposite end faces of the single-mode fiber at the fusion joint of the hollow-core photonic crystal fiber 405 respectively form two reflecting surfaces of the Fabry-Perot cavity. 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 certain thickness of palladium or palladium alloy film 3 is plated on the surface of the hollow-core photonic cr...

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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: interference fiber hydrogen sensor (see Optical fiber hydrogen sensor, M.A. Butler, Applied Physics Letters, 1984, Vol.45(10), pp.1007-1009), microlens Type 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 elastoopic fiber optic optic bragg grating sensors formultiplexed hydrogen sensing, Boonsong S., Sensor and Actuators B, Vol.60, 1999, pp.27-34). [0003] Because metal palladium (Pd) absorbs hydrogen in a low partial pressure hydrogen environment to produce elo...

Claims

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Application Information

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Patent Type & Authority Applications(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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