CN200975958Y - Gas sampling chamber - Google Patents
Gas sampling chamber Download PDFInfo
- Publication number
- CN200975958Y CN200975958Y CN 200620014906 CN200620014906U CN200975958Y CN 200975958 Y CN200975958 Y CN 200975958Y CN 200620014906 CN200620014906 CN 200620014906 CN 200620014906 U CN200620014906 U CN 200620014906U CN 200975958 Y CN200975958 Y CN 200975958Y
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- infrared
- cavity
- gas sample
- gas
- sampling hut
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Abstract
The utility model discloses a gas sampling room which can be applied to fields of infrared gas analyzer (or sensor), and can reduce the influence of the dust and the vapor toward the accuracy of measurement to the utmost extent, and thus can improve the accuracy of measurement. The structure of the utility model comprises a sampling room housing, on which an opening is positioned, which can connect the internal cavity with the outside. A window is also positioned on the sampling room housing, which can let the light permeate. The utility model is characterized in that a blocking device is also arranged inside the sampling room housing to block the reflection of the light. For instance, the internal cavity wall of the sampling room can be made quite crude, or the internal cavity wall can be made by materials which can absorb the infrared ray with strong capability, or the substance with strong capability of absorbing the infrared ray can be smeared on the surface of the internal cavity wall, or a reflected light catch ring can be arranged inside the cavity of the sampling room to block the reflected light to enter the infrared receiver, etc. Thus, little or even no reflected light can reach the infrared receive, which will greatly improve the ability of the infrared gas analyzer (or sensor) in preventing the interference of the dust and the vapor.
Description
Technical field
The utility model relates to infrared gas analyzer device field, refers more particularly to a kind of gas sample chamber that is used in infrared gas analysis field or infrared gas sensor field.
Background technology
In the infrared gas analysis field, (Non-Dispersive Infrared NDIR) has obtained general application to the non-dispersive infrared gas analytical technology.The NDIR (Non-Dispersive Infrared) technology is considered to one of best method that is used for gasmetry for a long time.Non-dispersive infrared gas analyser (or sensor) also has the advantage of especially sensitive, stable, reliable, long-life and easy maintaining except having special characteristics of high efficiency.The major defect of NDIR (Non-Dispersive Infrared) measuring technique is the structure more complicated and costs an arm and a leg.Gas sample chamber is parts commonly used in the on-dispersive infrared gas analysis field.
As shown in Figure 1, typical binary channels non-dispersive infrared gas analyser comprises the infrared light supply 1 of a band parabolic mirror, gas sample chamber 2, two infrared eyes 3 and 4 that have different infrared fileters 31,41; Gas sample chamber cavity 21 is provided with the opening 23 and 24 that can allow the inner chamber 22 and the external world communicate, and also is provided with the infrared window 25 and 26 that can allow infrared light see through on sampling hut's cavity 21.
During measurement, the gas that need measure enters from opening 23 by the mode that spreads naturally or machinery pumps into and is full of in the inner chamber 22 of whole gas sample chamber, needs the gas of discharge to discharge from opening 24.The infrared light that sends from infrared light supply 1 (can be infrared bulb, infrared heating element or infrarede emitting diode), the infrared window 25 by gas sample chamber one end enters sampling hut's inner chamber 22; Then, pass gas to be measured and the infrared window 26 that is positioned at the other end, arrive two infrared eyes 3 and 4.Because the arrowband infrared fileter 31 and 41 of different wave length is housed before two infrared eyes 3 and 4---a common infrared fileter (being assumed to be 31) can only be by or not by the infrared light of the maximum specific wavelength of gas absorption to be measured by the infrared light of the specific wavelength of gas absorption to be measured, another infrared fileter (being assumed to be 41), therefore, have only the infrared light of two kinds of specific wavelengths could see through optical filter 31 and 41 two infrared eyes 3 of back arrival and 4.Like this, the light intensity of following the tracks of infrared light supply 1 with regard to available infrared eye 3 changes, and measures the degree of absorption of gas to be measured to infrared light with another infrared eye 4.According to Beer-Lambert law (TheBeer-Lambert Law), under the constant situation of air pressure, gas to be measured is relevant in the concentration of the length of the absorption coefficient of this wavelength, infrared light process in gas and gas to the degree of absorption of infrared light intensity and this gas.Because the above two are fixed, infrared light is absorbed the concentration change that degree change can reflect gas.
In this infrared-gas measuring technique, the arrowband infrared fileter has replaced the infrared dispersion element, and therefore, this technology is called as non-dispersive infrared gas measuring technique (NDIR).Because used two infrared channels to come the concentration of measurement gas, this mode become the binary channels measuring technique.The advantage of binary channels measuring technique is that the secular variation of light source is offset, thereby obtains long-time stability preferably.
In this measuring technique, the incident light of infrared eye can be divided into from the direct light of light source with from reflected light two parts of sampling hut's inwall reflection.In order to maximally utilise the infrared light that infrared light supply sends, the inwall 27 of traditional gas sample chamber all adopts infrared reflective material or structure.Such as: the metal tube of inwall polishing, or the glass tube of inwall gold-plated (or other corrosion resistant metal), or inwall plates the plastic injection piece of metal etc.Utilize the high reflectance of smooth metal face (or other highly reflective structure), improve the infrared projectile energy of infrared eye, and then improve the signal to noise ratio (S/N ratio) of infrared eye infrared light.
The advantage of such gas sample chamber is to have made full use of the infrared light that light source sends, and has improved the precision of measuring, and shortcoming is the interference that is subjected to dust and steam easily.Small amount of dust of adsorbing on the smooth metal face or steam can reduce the reflection potential of metal covering to infrared light greatly.Because it is reflected light from sampling hut's inwall greatly that the incident light of infrared eye has, direct light only accounts for sub-fraction.When inwall adsorbed, reflected light can be subjected to very big influence as dust or steam, and direct light is then unaffected substantially.Because the ratio that reflected light accounts for is very big, the variation of the total incident light of infrared eye also can be very big, thereby have a strong impact on the precision of measurement.
Dust or steam can not be fully evenly in the absorption of gas sample chamber interior walls, also can not be identical and arrive the reflection paths of the infrared light of two infrared eyes.Like this, the infrared light of two passages that caused by the absorption of dust or steam changes and just is difficult to be consistent.Therefore, from the principle, adopt the gas sample chamber of reflectivity inwall to be difficult to suppress fully the harmful effect of dust or steam to measurement result.
For reducing the interference of dust and steam, some instrument has taked some technical measures to reduce these interference.As, gas filters the dust of carrying secretly in the gas to remove before entering the sampling hut; By heating, improve mirror temperature, reduce the absorption of steam on minute surface; By the way of condensation or absorption, remove the steam in the gas to be measured, or the like.But, in the life cycle that reaches more than ten years sometimes, in some real environment for use (as high dust atmosphere, high humidity environment, small and exquisite handheld application, portable use of finite energy or the like), above-mentioned measure or be difficult to adopt perhaps can't be avoided the absorption at sampling hut's inwall of steam and dust.Therefore, steam and dust also are inevitable in the absorption of reflectivity gas sample chamber interior walls to the influence of measuring accuracy.
The utility model content
The technical problems to be solved in the utility model is: thus a kind of dust and steam improve measuring accuracy to the influence of measuring accuracy gas sample chamber that reduces to greatest extent will be provided.
For solving the problems of the technologies described above, know-why of the present utility model is: reduce inwall reflected light proportion in the total incident light of infrared eye to greatest extent, thereby reduce the influence to measuring accuracy of dust and steam to greatest extent.For this reason, the utility model adopts following technical scheme:
Described gas sample chamber comprises: sampling hut's cavity, sampling hut's cavity are provided with the opening that can allow the cavity inner chamber and the external world communicate, and also are provided with the window that can allow light see through on sampling hut's cavity.Be characterized in: in the inner chamber of sampling hut's cavity, also be provided with the hinder device that hinders the light reflection.
First kind of structure of above-mentioned hinder device is: the internal chamber wall of sampling hut's cavity is provided with the obstruction reflection horizon of making by near the material of zero infrared reflectivity.During concrete the making, can on the internal chamber wall of sampling hut's cavity, apply near the obstruction reflection horizon or the internal chamber wall of zero infrared reflectivity and directly make by the material of approaching zero infrared reflectivity.
Second kind of structure of described hinder device is: the internal chamber wall surface of described sampling hut cavity is the surface of roughening.During concrete the making, can carry out roughening, porous processing to the inner chamber wall surface.
The third structure of described hinder device is: first and second kinds of above-mentioned textural associations are used.That is: obstruction reflection horizon or the internal chamber wall that is coated with approaching zero infrared reflectivity on the internal chamber wall of sampling hut's cavity directly made by the material of approaching zero infrared reflectivity, and roughening, porous processing are carried out in the internal chamber wall surface of sampling hut's cavity, make the internal chamber wall surface roughening.
The another kind of described hinder device further structure is: also several reflected light catch rings can be set on the internal chamber wall of sampling hut's cavity.These reflected light catch rings can be done very thinly, and can also be provided with by the obstruction reflection horizon of making near zero reflectivity material and to its outside surface at its outside surface and also carry out roughened.Simultaneously, when actual fabrication, the quantity of reflected light catch ring, size and position should be relevant with the concrete size of sampling hut's cavity, that is, and and blocking reflected light to greatest extent.
The utility model has the advantages that: be provided with the structure that hinders infrared light reflection in the inner chamber of sampling hut's cavity after, the reflectivity of infrared light can be near zero; Even reflection is perhaps arranged, but the reflected light that can enter into infrared eye is close to zero.Like this, in total incident light of infrared eye, catoptrical ratio is near zero, and catoptrical variation just reduces greatly to the influence of the total incident light of infrared eye; Dust or steam just can drop in the acceptable scope the influence of measuring accuracy, thereby have improved anti-dust of infrared gas analyzer device (or sensor) or steam interference capability.
Description of drawings
Fig. 1 is the structural principle synoptic diagram of the gas sample chamber described in the background technology;
Fig. 2 is the structural principle synoptic diagram of first kind of embodiment of gas sample chamber described in the utility model;
Fig. 3 is the structural principle synoptic diagram of second kind of embodiment of gas sample chamber described in the utility model;
Fig. 4 is the structural principle synoptic diagram of the third embodiment of gas sample chamber described in the utility model;
Fig. 5 is the structural principle synoptic diagram of the 4th kind of embodiment of gas sample chamber described in the utility model;
Fig. 6 is the structural principle synoptic diagram of the 5th kind of embodiment of gas sample chamber described in the utility model;
Fig. 7 is the structural principle synoptic diagram of the 6th kind of embodiment of gas sample chamber described in the utility model;
Fig. 8 is the structural principle synoptic diagram of the 7th kind of embodiment of gas sample chamber described in the utility model.
Embodiment
The utility model will be further described below in conjunction with the drawings and specific embodiments, but the utility model should not only limit to these embodiment.
As shown in Figure 2, in the present embodiment, the structure of described gas sample chamber 2 is: the cavity 21 of gas sample chamber is provided with inner chamber 22 and the extraneous opening 23 and 24 that communicates, on sampling hut's cavity 21, also be provided with the window 25 and 26 that can allow light see through, and, the internal chamber wall 27 of sampling hut's cavity 21 is provided with the obstruction reflection horizon of making by near zero infrared reflectivity material---and can be by the material of infrared light strong absorption is made, perhaps scribble the material of strong absorption infrared light, and internal chamber wall 27 surfaces of sampling hut's cavity 21 are the surface of roughening or porous at inside surface.
The using method of gas sample chamber shown in Figure 2 and the using method of the gas sample chamber described in the background technology are similar, its difference is: after the infrared light that the infrared light supply 1 of band parabolic mirror sends enters in the inner chamber 22, its reflectivity is almost nil, that is: arrive in total incident light of infrared eye 3 and 4, catoptrical ratio is near zero, like this, catoptrical variation just reduces greatly to the influence of total incident light.Simultaneously, the surface of roughening or porous also makes dust adsorbed or steam that catoptrical influence is weakened greatly; The effect of two aspects integrates, and dust or steam just can drop in the acceptable scope the influence of measuring accuracy, thereby have improved measuring accuracy.
The gas sample chamber of this structure, narrower and small by opening 23 and 24 thereon, usually adopt the mode of forcing air inlet, by air pump gas to be measured is pumped in the gas sample chamber.Force air inlet advantage be that ventilation is fast, the application scenario of reaction time sensitivity is being used more (as explosive, hypertoxicity gas detection).Its shortcoming is to need extra device and energy.
As shown in Figure 3, be a kind of gas sample chamber that adopts the diffusion type intake method.Compare with gas sample chamber shown in Figure 2, in the embodiment shown in fig. 3, increased opening 23 on sampling hut's cavity 21 and 24 size greatly, and cavity is simplified to the framework with certain structural strength.Framework external application gas filtration material 8 is surrounded.Gas to be measured passes filterableness material 8 and enters in the chamber by diffusional effect.Be inwall 27 reflects infrared light that prevent the chamber, prevent that simultaneously the infrared light outside the chamber from entering formation interference in the chamber, the two sides of gas filtration material 8 and the inwall of cavity 27 all need to apply infrared absorbing material or are directly made by infrared absorbing material, and roughening is made on the surface or porous is handled.
The diffusion type air inlet is usually used less demanding occasion of reaction time at some.Therefore this mode does not need extra device and energy, uses wider in the portable or handheld application at some.
As shown in Figure 4, be another embodiment of the present utility model, to compare with embodiment shown in Figure 2, its difference is: the end at gas sample chamber 2 has increased a catoptron 5.During use, light source 1 and infrared eye 3 and 4 all are arranged on the other end of gas sample chamber 2.Increase catoptron 5 infrared light distance of process in gas is doubled, thereby can improve the precision of measurement.But owing to increased a catoptron, anti-dust and steam interference capability can descend to some extent.Therefore, this scheme relatively is applicable to those occasions for the portable use of wanting the cube miniaturization.
Embodiment shown in Figure 5 compares with embodiment shown in Figure 4, and its difference is: embodiment shown in Figure 5 has adopted the diffusion type intake method; The principle of its diffusion air inlet is identical with embodiment shown in Figure 3, repeats no more.
As shown in Figure 6, it is another embodiment of the present utility model, compare with embodiment shown in Figure 2, its difference is: also be provided with several reflected light catch rings 28 in the cavity 21 of gas sample chamber 2, the effect of reflected light catch ring 28 is: stop that the reflected light that cavity inner wall produces arrives infrared eye 3,4.As long as the spacing between the adjacent reflected light catch ring and the size design of reflected light catch ring itself are reasonable, just can make the reflected light of the overwhelming majority could arrive infrared eye through twice above reflection.Like this, compare to embodiment shown in Figure 5, used the gas analyzer of the gas sample chamber of this structure, the further raising of just having got back of its inhibition ability that dust and steam are disturbed with Fig. 2.
The shortcoming of this scheme is the ventilation difficulty, and the response time is long, relatively is fit to adopt the instrument of diffusion scavenging way, or adopts the positive mechanical ventilation but the application places lower to response time requirement.The reason of ventilation difficulty is that a plurality of dead angles of catch ring formation not on the passage of ventilation air-flow, therefore are difficult to finish ventilation.Simultaneously, the chamber inner volume of this structure is relatively large, and the ventilation volume that needs also increases thereupon.
Embodiment shown in Figure 7 compares with embodiment shown in Figure 6, and its difference is: embodiment shown in Figure 7 has adopted the diffusion type intake method; The principle of its diffusion air inlet and embodiment shown in Figure 3 are similar, repeat no more.
In order to improve the air exchanging rate of Fig. 6 and embodiment shown in Figure 7, satisfy the requirement of responsive occasion of reaction time, Fig. 8 provides a kind of novel air-exchanging structure that combines forced ventilation and diffusion ventilation advantage.Be characterized in: the side at gas sample chamber 2 is provided with a ventilating opening 6, and ventilating opening 6 is provided with a blower fan 9.Usually, in gas analyzer, the forced ventilation equipment of employing is mechanical pump, is characterized in that air quantity (flow) is little, blast height (pressure height), and the life-span is short.And what adopt in Fig. 8 is small-sized fans or fan blower, and their characteristics are that air quantity is big, and blast is low, and the life-span is long.The advantage of forced ventilation mode shown in Figure 8 is: the dead angle that catch ring forms is on the passage of ventilation air-flow, and ventilation easily.Simultaneously, big ventilation area has reduced the blast requirement, has improved ventilation volume.
Claims (6)
1, a kind of gas sample chamber comprises: sampling hut's cavity, sampling hut's cavity are provided with the opening that can allow the cavity inner chamber and the external world communicate, and also are provided with the window that can allow light see through on sampling hut's cavity; It is characterized in that: in the inner chamber of sampling hut's cavity, also be provided with the hinder device that hinders the light reflection.
2, gas sample chamber as claimed in claim 1 is characterized in that: described hinder device is: the internal chamber wall of sampling hut's cavity is provided with the obstruction reflection horizon of making by near zero reflectivity material.
3, gas sample chamber as claimed in claim 1 is characterized in that: described hinder device is: the internal chamber wall surface of described sampling hut cavity is the surface of roughening.
4, gas sample chamber as claimed in claim 1, it is characterized in that: described hinder device is: the internal chamber wall of sampling hut's cavity is provided with the obstruction reflection horizon of making by near zero reflectivity material, and the internal chamber wall of sampling hut's cavity surface is the surface of roughening.
5, as claim 2,3 or 4 described gas sample chambers, it is characterized in that: on the internal chamber wall of sampling hut's cavity, also be provided with several reflected light catch rings.
6, gas sample chamber as claimed in claim 5 is characterized in that: the outside surface at described reflected light catch ring also is provided with the obstruction reflection horizon of making by near zero reflectivity material, and the outside surface of reflected light catch ring also is the surface of roughening.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014906 CN200975958Y (en) | 2006-09-26 | 2006-09-26 | Gas sampling chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200620014906 CN200975958Y (en) | 2006-09-26 | 2006-09-26 | Gas sampling chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN200975958Y true CN200975958Y (en) | 2007-11-14 |
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ID=38902242
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200620014906 Expired - Lifetime CN200975958Y (en) | 2006-09-26 | 2006-09-26 | Gas sampling chamber |
Country Status (1)
| Country | Link |
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| CN (1) | CN200975958Y (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153832B (en) * | 2006-09-26 | 2010-07-07 | 李明 | Gas sampling room |
| CN102479850A (en) * | 2010-11-24 | 2012-05-30 | 吉富新能源科技(上海)有限公司 | Transparent heat absorption type solar battery applied to building facades |
| CN103728161A (en) * | 2014-01-03 | 2014-04-16 | 广西电网公司电力科学研究院 | Spectroscopic analysis-based sulfur hexafluoride gas sampling device |
-
2006
- 2006-09-26 CN CN 200620014906 patent/CN200975958Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101153832B (en) * | 2006-09-26 | 2010-07-07 | 李明 | Gas sampling room |
| CN102479850A (en) * | 2010-11-24 | 2012-05-30 | 吉富新能源科技(上海)有限公司 | Transparent heat absorption type solar battery applied to building facades |
| CN103728161A (en) * | 2014-01-03 | 2014-04-16 | 广西电网公司电力科学研究院 | Spectroscopic analysis-based sulfur hexafluoride gas sampling device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20071114 Effective date of abandoning: 20060926 |