CN110426423A - The device of individual event constant foreign gas content in a kind of detection neon - Google Patents
The device of individual event constant foreign gas content in a kind of detection neon Download PDFInfo
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- CN110426423A CN110426423A CN201910731335.3A CN201910731335A CN110426423A CN 110426423 A CN110426423 A CN 110426423A CN 201910731335 A CN201910731335 A CN 201910731335A CN 110426423 A CN110426423 A CN 110426423A
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- neon
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- thermistor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/045—Circuits
- G01N27/046—Circuits provided with temperature compensation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
- G01N27/04—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance
- G01N27/14—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature
- G01N27/18—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested
- G01N27/185—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance by investigating resistance of an electrically-heated body in dependence upon change of temperature caused by changes in the thermal conductivity of a surrounding material to be tested using a catharometer
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Abstract
The embodiment of the invention discloses a kind of devices of individual event constant foreign gas content in detection neon, described device includes detection unit and computing unit, based on heat conductivity of gas principle, since the presence of individual event foreign gas in neon causes the thermal conductivity for mixing under test gas to be changed relative to pure neon, the change in resistance of thermistor caused by variation by this thermal conductivity is detected by Wheatstone bridge, and calculate the thermal conductivity of mixing under test gas, to obtain the content of foreign gas in neon, the on-line checking to individual event constant foreign gas content in neon may be implemented, compared to the mode of chromatographic isolation detection, both cost is greatly saved, with reaching the mesh of real-time detection again, it solves the problems, such as difficult on Row control.
Description
Technical field
The present embodiments relate to chemical industry measurement technical fields, and in particular to individual event constant impurity gas in a kind of detection neon
The device of body content.
Background technique
When purification mixes the neon of a small amount of foreign gas (such as nitrogen, helium, hydrogen or oxygen), or in measurement neon
When the content of foreign gas, the prior art generallys use the principle of chromatographic isolation, and the foreign gas in neon is separated, will be measured
Gas is passed through the content of checked for impurities gas in corresponding detector, however uses chromatograph cost very high, and due to
To need five minutes or so time that can just obtain as a result, leading to not to behaviour by each component of chromatography post separation, the process
Accomplish to control in real time as process, there is the difficulty in control.
Summary of the invention
For this purpose, the embodiment of the present invention provides a kind of device for detecting individual event constant foreign gas content in neon, to solve
It is at high cost, testing time length when the existing method using chromatographic isolation separates or measures a small amount of foreign gas in neon
Problem.
To achieve the goals above, the embodiment of the present invention provides the following technical solutions: individual event constant in a kind of detection neon
The device of foreign gas content, described device include detection unit and computing unit；
The detection unit includes four groups of constant temperature conductance cells, is provided with thermistor in the constant temperature conductance cell, and four groups
Reference cell is used as two groups in the constant temperature conductance cell, remaining two groups are used as measuring cell, encapsulate reference gas, institute in the reference cell
The under test gas that circulates in measuring cell is stated, the under test gas is the neon comprising individual event constant foreign gas, temperature-sensitive described in four groups
Resistance constitutes Wheatstone bridge, and the thermistor of two groups of reference cells or the thermistor of two groups of measuring cells are arranged opposite to each other, institute
It states and is connected with constant current in Wheatstone bridge；
The computing unit is for warm in the measuring cell according to the uneven potential calculation that the Wheatstone bridge exports
The resistance value of quick resistance, is calculated the thermal conductivity of under test gas according to the resistance value, and according to the thermal conductivity calculate to
Survey the content of foreign gas in gas.
Further, the thermistor of reference cell described in two groups is respectively R1 and R2, the temperature-sensitive electricity of measuring cell described in two groups
Resistance is respectively the series arm of R3 and R4, thermistor R1 and thermistor R3 and connecting for thermistor R2 and thermistor R4
Branch circuit parallel connection forms Wheatstone bridge.
Further, the node between the thermistor R1 and thermistor R3 is the first output end, thermistor R2
Node between thermistor R4 is second output terminal, and the uneven potential of the Wheatstone bridge output is described first defeated
Potential difference between outlet and second output terminal.
Further, the measuring cell both ends are respectively arranged with air inlet and air outlet, the under test gas through it is described into
Port flows into, and is flowed out by the gas outlet.
Further, the constant temperature conductance cell is all set in thermostat.
Further, the reference gas is pure neon, and the under test gas is the neon comprising individual event constant foreign gas
Gas.
Further, the reference gas is the neon of the individual event constant foreign gas comprising known content, described to be measured
Gas is the neon comprising the individual event constant foreign gas with the reference gas identical type.
Further, the individual event constant foreign gas is any one of nitrogen, helium, oxygen or hydrogen.
Further, the content for the individual event constant foreign gas for including in the neon by changing reference gas, to change
For the range and precision of corresponding individual event foreign gas detection.
Further, the resistance value of thermistor described in four groups at the same temperature is identical.
The embodiment of the present invention has the advantages that
The device of individual event constant foreign gas content in a kind of detection neon that the embodiment of the present invention proposes, is based on air heat
Conductance principle, since the presence of foreign gas (such as nitrogen, helium, hydrogen or oxygen) in neon leads to the heat for mixing under test gas
Conductance is changed relative to pure neon, and the change in resistance of thermistor caused by the variation by this thermal conductivity passes through favour stone
Electric bridge is detected, and calculates the thermal conductivity of mixing under test gas, to obtain the content of foreign gas in neon, Ke Yishi
Now the on-line checking of individual event constant foreign gas content in neon was both greatly saved compared to the mode of chromatographic isolation detection
Cost-saving, and with reaching the mesh of real-time detection, it solves the problems, such as difficult on Row control.
Detailed description of the invention
It, below will be to embodiment party in order to illustrate more clearly of embodiments of the present invention or technical solution in the prior art
Formula or attached drawing needed to be used in the description of the prior art are briefly described.It should be evident that the accompanying drawings in the following description is only
It is merely exemplary, it for those of ordinary skill in the art, without creative efforts, can also basis
The attached drawing of offer, which is extended, obtains other implementation attached drawings.
The knot of the device of individual event constant foreign gas content in a kind of detection neon that Fig. 1 provides for the embodiment of the present invention 1
Structure schematic diagram；
The device detection of individual event constant foreign gas content in a kind of detection neon that Fig. 2 provides for the embodiment of the present invention 1
The structural schematic diagram of unit；
The device measurement of individual event constant foreign gas content in a kind of detection neon that Fig. 3 provides for the embodiment of the present invention 1
The structural schematic diagram in pond.
In figure: detection unit 100, computing unit 200, thermostat 110, reference cell 120, measuring cell 130, air inlet
131, gas outlet 132.
Specific embodiment
Embodiments of the present invention are illustrated by particular specific embodiment below, those skilled in the art can be by this explanation
Content disclosed by book is understood other advantages and efficacy of the present invention easily, it is clear that described embodiment is the present invention one
Section Example, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Embodiment 1
As shown in Figure 1, the present embodiment propose a kind of detection neon in individual event constant foreign gas content device, device
Including detection unit 100 and computing unit 200.
As shown in Fig. 2, detection unit 100 includes the identical constant temperature conductance cell of four groups of specifications, four groups of constant temperature heatings
It leads pond to be all set in thermostat 110, to provide constant temperature T.Thermistor, four groups of heat are provided in four groups of constant temperature conductance cells
The resistance value of quick resistance at the same temperature is identical and its material, specification, size are also all identical.Two in four groups of constant temperature conductance cells
Group is used as reference cell 120, remaining two groups are used as measuring cell 130, and reference gas, circulation in measuring cell 130 are encapsulated in reference cell 120
Under test gas, under test gas is the neon comprising individual event constant foreign gas, as shown in figure 3,130 both ends of measuring cell are respectively set
There are air inlet 131 and gas outlet 132, under test gas is flowed into through air inlet 131, and is flowed out by gas outlet 132.
Reference gas can be that pure neon or the neon for the individual event constant foreign gas comprising known content, individual event are normal
Measuring foreign gas can be any one of gases such as nitrogen, helium, oxygen or hydrogen.When reference gas is pure neon, measurement
It can be used for measuring the neon comprising any of the above individual event constant foreign gas in pond 130；Reference gas is to include known content
Certain individual event constant foreign gas neon when, include and identical type in reference gas for measure in measuring cell 130
The neon of individual event constant foreign gas.For example, when reference gas is the neon of the helium foreign gas comprising known content, measurement
For measuring the neon comprising helium foreign gas in pond 130；Reference gas is the Nitrogen gas impurity gas comprising known content
When neon, for measuring the neon comprising Nitrogen gas impurity gas in measuring cell 130；Reference gas is the oxygen comprising known content
When the neon of foreign gas, for measuring the neon comprising oxygen impurities gas in measuring cell 130；Reference gas is comprising known
When the neon of the hydrogen impurity gas of content, for measuring the neon comprising hydrogen impurity gas in measuring cell 130.Pass through adjusting
The component content of the individual events such as nitrogen contained in neon, helium, oxygen or hydrogen constant foreign gas, Ke Yizeng in reference cell
It is added in the measuring range and precision of the correspondence foreign gas of the unknown content near the content.
Four groups of thermistors constitute Wheatstone bridges, the thermistor of two groups of reference cells 120 or the heat of two groups of measuring cells 130
Quick resistance is arranged opposite to each other, and constant current I is connected in Wheatstone bridge.Specifically, the thermistor of two groups of reference cells 120 point
Not Wei R1 and R2, the thermistor of two groups of measuring cells 130 is respectively R3 and R4, the series connection branch of thermistor R1 and thermistor R3
Road formation Wheatstone bridge in parallel with the series arm of thermistor R2 and thermistor R4.Two ginsengs in wheatstone bridge circuits
Than the thermistor R1 and R2 in pond 120 as reference arm, the thermistor R3 and R4 in two measuring cells 130 are as measurement
Arm.Node between thermistor R1 and thermistor R3 is the first output end, between thermistor R2 and thermistor R4
Node is second output terminal, potential of the uneven potential of Wheatstone bridge output between the first output end and second output terminal
Poor Vout.
Under fixed temperature T, the content of nitrogen or helium determines that mixing is to be measured in neon nitrogen or neon helium mixing under test gas body
The thermal conductivity of gas body can extrapolate the nitrogen or helium content that mix under test gas body by measuring thermal conductivity.
In the constant temperature conductance cell that temperature is T, thermistor flows through constant current I, and the temperature of thermistor is t.When pure
When neon body slowly circulates in constant temperature conductance cell, by pure neon body the heat of thermistor is conducted, when reaching
After thermal balance, the temperature of thermistor will be changed by t for t1, and when in pure neon doped with foreign gases such as nitrogen or helium
After mixing under test gas, since the thermal conductivity of the foreign gases such as nitrogen or helium and the thermal conductivity of pure neon are variant
(difference is larger), the thermal conductivity of the mixing under test gas will be varied relative to pure neon body, to change constant temperature conductance cell
Interior thermal balance, so that the temperature of thermistor is t2 by t1 variation.Due to the difference of t1 and t2, so that the resistance value of thermistor
It can change, cause matched wheatstone bridge circuits uneven, generate micro-current, pass through the available heat of this potential change
The resistance value of thermistor when balance finally obtains to calculate the variation of the thermal conductivity of neon nitrogen or neon helium mixing under test gas
Mix the content of nitrogen or helium under test gas body.
When what is encapsulated in the concentration for neon nitrogen or neon helium the mixing under test gas body being passed through in measuring cell 130 and reference cell 120
When pure neon (or mixing under test gas body) concentration is consistent, under test gas thermal conductivity and encapsulation gas phase are same, and bridge circuit exports
Voltage is zero, when what is encapsulated in neon nitrogen (or neon helium) the mixing under test gas bulk concentration and reference cell 120 being passed through in measuring cell 130
When gas concentration difference, under test gas thermal conductivity is also different from encapsulation gas, causes measurement arm resistance value when thermal balance to change, electric bridge
Export uneven potential.
Thermistor in the uneven potential calculation measuring cell 130 that computing unit 200 is used to be exported according to Wheatstone bridge
Resistance value, be calculated the thermal conductivity of under test gas according to resistance value, and calculate according to following thermal conductivity calculation formula to be measured
The content C of foreign gas in gasM。
CM=CM1+CR-CM1·CR (1)
λM=CM1·λX+(1-CM1)·λT (2)
Wherein:
CM: the content of foreign gas under test gas；
CM1: assuming that reference gas is gas one, pure foreign gas is gas two, CM1For gas one with
The content of gas two in the mixing under test gas body that gas two forms；
CR: the content of individual event constant foreign gas in reference cell gas；
λM: when conductance cell fixed temperature T, the thermal conductivity of under test gas in measuring cell；
λT: when conductance cell fixed temperature T, the thermal conductivity of reference cell reference gas；
λX: thermal conductivity when pure foreign gas temperature T；
K: instrument constant, it is related to thermal conductivity pool structure, it is measured through test；
R0: resistance value of the thermistor at 0 DEG C；
α: thermistor temp coefficient；
I: the electric current of thermistor is flowed through；
Vout: the uneven potential difference of Wheatstone bridge output.
The device of individual event constant foreign gas content in a kind of detection neon that the present embodiment proposes, is based on heat conductivity of gas
Principle, since the presence of foreign gas (such as helium or nitrogen) in neon causes the thermal conductivity for mixing under test gas relative to pure
Neon is changed, and the change in resistance of thermistor caused by the variation by this thermal conductivity is examined by Wheatstone bridge
It surveys, and the thermal conductivity for calculating mixing under test gas may be implemented to obtain the content of foreign gas in neon in neon
The on-line checking of individual event constant foreign gas content not only greatly saves cost, but also reach compared to the mode of chromatographic isolation detection
To the mesh of real-time detection, solve the problems, such as difficult on Row control.
Although above having used general explanation and specific embodiment, the present invention is described in detail, at this
On the basis of invention, it can be made some modifications or improvements, this will be apparent to those skilled in the art.Therefore,
These modifications or improvements without departing from theon the basis of the spirit of the present invention are fallen within the scope of the claimed invention.
Claims (10)
1. the device of individual event constant foreign gas content in a kind of detection neon, which is characterized in that described device includes that detection is single
Member and computing unit；
The detection unit includes four groups of constant temperature conductance cells, thermistor is provided in the constant temperature conductance cell, described in four groups
Reference cell is used as two groups in constant temperature conductance cell, remaining two groups are used as measuring cell, encapsulate reference gas, the survey in the reference cell
The under test gas that circulates in pond is measured, the under test gas is the neon comprising individual event constant foreign gas, thermistor described in four groups
Wheatstone bridge is constituted, the thermistor of two groups of reference cells or the thermistor of two groups of measuring cells are arranged opposite to each other, the favour
Constant current is connected in stone electric bridge；
The computing unit is for temperature-sensitive electricity in the measuring cell according to the uneven potential calculation that the Wheatstone bridge exports
The thermal conductivity of under test gas is calculated according to the resistance value, and calculates gas to be measured according to the thermal conductivity for the resistance value of resistance
The content of foreign gas in body.
2. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
The thermistor of reference cell described in two groups is respectively R1 and R2, and the thermistor of measuring cell described in two groups is respectively R3 and R4, heat
The series arm of quick resistance R1 and thermistor R3 formation favour in parallel with the series arm of thermistor R2 and thermistor R4 this
Energization bridge.
3. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
Node between the thermistor R1 and thermistor R3 is the first output end, between thermistor R2 and thermistor R4
Node is second output terminal, the uneven potential of Wheatstone bridge output be first output end and second output terminal it
Between potential difference.
4. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
The measuring cell both ends are respectively arranged with air inlet and air outlet, and the under test gas is flowed into through the air inlet, and by described
Gas outlet outflow.
5. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
The constant temperature conductance cell is all set in thermostat.
6. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
The reference gas is pure neon, and the under test gas is the neon comprising individual event constant foreign gas.
7. the device of individual event constant foreign gas content in a kind of detection neon according to claim 1, which is characterized in that
The reference gas be the individual event constant foreign gas comprising known content neon, the under test gas be comprising with the ginseng
The neon of individual event constant foreign gas more congener than gas phase.
8. the device of individual event constant foreign gas content in a kind of detection neon according to claim 7, special
Sign is that the content for the individual event constant foreign gas for including in the neon by changing reference gas is single for corresponding to change
The range and precision of item foreign gas detection.
9. the device of individual event constant foreign gas content in a kind of detection neon described according to claim 6 or 7 or 8, special
Sign is that the individual event constant foreign gas is any one of nitrogen, helium, oxygen or hydrogen.
10. the device of individual event constant foreign gas content, feature exist in a kind of detection neon according to claim 1
In the resistance value of thermistor described in four groups at the same temperature is identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910731335.3A CN110426423B (en) | 2019-08-08 | 2019-08-08 | Device for detecting content of single constant impurity gas in neon |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910731335.3A CN110426423B (en) | 2019-08-08 | 2019-08-08 | Device for detecting content of single constant impurity gas in neon |
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| CN110426423A true CN110426423A (en) | 2019-11-08 |
| CN110426423B CN110426423B (en) | 2022-05-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281374A (en) * | 2021-07-13 | 2021-08-20 | 宝武清洁能源鄂州有限公司 | Method for analyzing helium and neon contents in coarse helium neon on line |
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|---|---|---|---|---|
| US2751777A (en) * | 1951-03-08 | 1956-06-26 | Saint Gobain | Gas analysis apparatus |
| CN1037967A (en) * | 1988-05-16 | 1989-12-13 | 通用电气公司 | Binary gas analyzer instrument and analytical approach |
| US5265459A (en) * | 1991-08-22 | 1993-11-30 | The Perkin Elmer Corporation | Single-element thermal conductivity detector |
| CN2572404Y (en) * | 2002-10-14 | 2003-09-10 | 安徽省电力试验研究所 | Hydroge purity detector with heat conductive pool |
| CN101377469A (en) * | 2008-07-15 | 2009-03-04 | 华南理工大学 | Method and apparatus for real-time detecting mixing gas component content by thermal conductivity detector |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113281374A (en) * | 2021-07-13 | 2021-08-20 | 宝武清洁能源鄂州有限公司 | Method for analyzing helium and neon contents in coarse helium neon on line |
| CN113281374B (en) * | 2021-07-13 | 2024-04-12 | 宝武清洁能源鄂州有限公司 | Method for online analysis of helium and neon contents in crude helium-neon |
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| CN110426423B (en) | 2022-05-27 |
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