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Hydrogen gas sensor based on thermal conduction principle

A sensor and sensor housing technology, applied in the field of hydrogen sensors, can solve the problems of limiting the advantages and promotion of thermal conductivity sensors, baseline drift, etc., and achieve the effects of compact structure, reduced impact, and slow thermal conductivity.

Inactive Publication Date: 2010-06-23
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the technical problem of the thermal conductivity hydrogen sensor is that it is susceptible to the influence of ambient temperature and surrounding airflow fluctuations, as well as the baseline drift caused by the self-heating of the sensor during operation, which limits the advantages and promotion of the thermal conductivity sensor to a certain extent.

Method used

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  • Hydrogen gas sensor based on thermal conduction principle
  • Hydrogen gas sensor based on thermal conduction principle
  • Hydrogen gas sensor based on thermal conduction principle

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1 heat-sensitive metal wire is wound on the glass 28 to make measurement thermistor 101 and reference thermistor 102;

[0034] 2 The measuring thermistor 101, the reference thermistor 102 and the bridge resistance 201 form a Wheatstone bridge, the measuring thermistor 101 is located on the upper side of the measuring pool PCB board 401, and the reference thermistor 102 is located in the reference pool On the upper side of the PCB board 402, the bridge resistors 201 are located on the lower side of the respective corresponding PCB boards, maintaining the symmetry between the resistors;

[0035] 3 A cylindrical aluminum block with a diameter of 4 cm and a height of 3 cm, on which a circular through hole with a diameter of 7.2 mm is processed, which is the measurement pool 301, and the other 7.2 mm circular hole is not connected, which is the reference pool 302;

[0036] 4 Install two PCB boards into their respective pools, and seal them with baffles 502;

[0037] 5 The t...

Embodiment 2

[0040] Four identical thermistors are used to form a Wheatstone bridge, one of which is a measuring resistor, one is a reference resistor, and the other two are used as bridge resistors. All the other steps are the same as in Example 1.

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Abstract

The invention provides a hydrogen gas sensor based on a thermal conduction principle. The sensor comprises the thermistor of a measuring cell, the thermistor of a reference cell, a bridge fixed resistor, a PCB board, a shell and an amplifying circuit, the top of the measuring cell is provided with a porous membrane or a reticular supporter, the reference cell is of a leak-proof structure, and hydrogen gas cannot infiltrate into the reference cell. The thermistor and the bridge resistor are respectively fixed on the upper and lower sides of the PCB board. The amplifying circuit is arranged at the bottom or outside the shell of the sensor. By optimizing the physical structure of the sensor, the invention realizes the self thermal balance of the sensor, inhibits the interference of an external environment, has small and compact structure, and is applicable to general on-site environment for a long time.

Description

technical field [0001] The invention relates to a hydrogen sensor, in particular to a hydrogen sensor based on the principle of heat conduction. Background technique [0002] Hydrogen is an industrial gas commonly used in production and a common product in chemical process production. It is also the most potential clean energy in the future. Therefore, the use of hydrogen is accompanied by the entire process of modern industry. Research on new production processes and storage and transportation technologies for hydrogen Also in the ascendant. However, due to the unsafety of hydrogen, the hydrogen sensor has become an indispensable device. Only with fast and reliable monitoring methods in the process of production, experiment and use can the danger be effectively avoided. [0003] Most of the current hydrogen sensors use selective gas sensitive membrane technology, for example: palladium film is coated on the surface of the optical fiber as a sensitive material, and the effe...

Claims

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Application Information

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IPC IPC(8): G01N27/14
Inventor 关亚风朱蕴卿王建伟夏金伟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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