CN202710497U - Light path system of cold mirror type dew point tester - Google Patents
Light path system of cold mirror type dew point tester Download PDFInfo
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- CN202710497U CN202710497U CN 201220352367 CN201220352367U CN202710497U CN 202710497 U CN202710497 U CN 202710497U CN 201220352367 CN201220352367 CN 201220352367 CN 201220352367 U CN201220352367 U CN 201220352367U CN 202710497 U CN202710497 U CN 202710497U
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- light
- silicon photocell
- minute surface
- dew point
- path system
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Abstract
The utility model discloses a light path system of a cold mirror type dew point tester. The light path system is used for testing a dew point condition on a mirror face of a measuring head and comprises a point light source, wherein one part of light rays emitted by the point light source irradiates to a compensation silicon photocell through a light-blocking screw, the other part of light rays becomes parallel light to irradiate onto the mirror face through a lens I, and the parallel light is reflected by the mirror face and is focused onto the diaphragm through a lens II; and when dew appears on the mirror face, the parallel light irradiating to the mirror face is subjected to diffuse reflection and becomes divergent light to leak through a diaphragm mostly through the lens II to irradiate to a working silicon photocell, and the working silicon photocell transmits light signals to a light path conditioning circuit in the tester. According to the utility model, a dual-light-path system is adopted to eliminate measurement errors caused by influences of ambient temperature to the input properties of the silicon photocell, and caused by fluctuation of the light source and other common factors so as to improve measurement precision.
Description
Technical field
The utility model relates to a kind of surveying instrument for gas analysis, in particular, relate to a kind ofly for the measurement gas micro-moisture, be used for to analyze the structure of light path system of the dew point tester of the gases such as nitrogen, oxygen, helium, argon, air and sulfur hexafluoride.
Background technology
Along with industrial circle is more and more higher to the various high-purity gas requirements of using, the analysis and detection technology of gas purity also obtains more attention.Concerning high-purity gas, its major impurity is take trace water as main, and detection method adopts electrolytic process, sensor method and Cold Mirrors method usually.Front two kinds of methods are mainly used in the gas purity measuring accuracy and require not too high occasion.
Adopt the instrument of Cold Mirrors method measuring principle to be referred to as dew point hygrometer, so-called dew point refers to the gradually cooling in the constant situation of vapour pressure of given air, in this course, steam condenses into dew gradually, this adiabatic condensation temperature point is called dew point, exactly should be thermodynamic dew-point temperature, under this temperature, moisture content when airborne moisture content exactly equals this air and reaches capacity, dewpoint temperature usually is used for representing trace water contained in the gas.Cold Mirrors method measuring principle is based upon on this theoretical foundation, and it has the accuracy height, the characteristics that measurement range is wide.The Cold Mirrors dew point hygrometer generally can be used as the secondary measurement standard and calibrates the gas trace water tester of being made by electrolytic process and sensor method.But because the impact of the factors such as fluctuation of environment temperature and light source, whether true Cheng Lu causes certain measurement and error in judgement to the measuring head minute surface.
The utility model content
In order to overcome above-mentioned problems of the prior art, the utility model provides a kind of light path system of chilled-mirror type dew point tester, adopt double beam system, to eliminate environment temperature to the measuring error that fluctuation and other common factor of silicon photocell input characteristics, light source causes, improve measuring accuracy.
In order to achieve the above object, the technical scheme that adopts of the utility model is as follows:
A kind of light path system of chilled-mirror type dew point tester, be used for the dew point situation on the measuring head minute surface is detected, comprise: pointolite, its a part of light that sends shines the compensation silicon photocell by the screw that is in the light, another part rays pass through lens one becomes directional light and shines on the minute surface, and directional light at minute surface reflection scioptics two occurs and focuses on the diaphragm; When on the minute surface dew being arranged, be mapped to the directional light generation diffuse reflection of minute surface, directional light becomes diverging light scioptics two major parts and leaked from diaphragm, is mapped on the work silicon photocell, and the work silicon photocell is given light path modulate circuit in the described tester with this optical signal transmission.
Described pointolite, be in the light screw and compensation silicon photocell are arranged in the right side, measurement chamber that described tester is used for the gas that enters measuring head is carried out the air-channel system of flow-dividing control, lens one, diaphragm and work silicon photocell are positioned at the left side in described measurement chamber, and minute surface is positioned at the central authorities in described measurement chamber.
The utility model has been owing to adopted double beam system, thereby eliminated the measuring error that environment temperature causes fluctuation and other common factor of silicon photocell input characteristics, light source; When the minute surface dewfall, the light signal of reflection is delivered to CPU by light path detection, A/D conversion, by special algorithm input signal is determined whether true Cheng Lu, and the dew point indicating value automatically locks simultaneously, and indicates with pilot lamp.
Description of drawings
Fig. 1 is the utility model light path system block diagram;
Embodiment
Below in conjunction with the drawings and specific embodiments technical solutions of the utility model are done a detailed explanation.
Fig. 1 is the utility model light path system block diagram.
Comprise: pointolite 1, lens 2,3, minute surface 4, compensation silicon photocell 5, work silicon photocell 6, diaphragm 7, screw 8 is in the light.Pointolite 1 emits beam, and a part is mapped to compensation silicon photocell 5 by the screw 8 that is in the light; Another part rays pass through lens 2 becomes directional light and is mapped on the minute surface 4, reflection scioptics 3 occur at minute surface 4 and focus on the diaphragm 7 in directional light, when on the minute surface 4 dew being arranged, be mapped to the directional light generation diffuse reflection of minute surface 4, directional light becomes diverging light scioptics 3 major parts and leaked from diaphragm 7, is mapped on the work silicon photocell 6; Work silicon photocell 6 with this light signal to the light path modulate circuit.The CPU of the light path modulate circuit is transformed into the simulating signal of light path system output numeral by the sampling of A/D translation circuit optical path signal to the tester judges whether there is cut-layer on the measuring head minute surface by CPU by the light path Processing Algorithm.
Described pointolite (1), the screw that is in the light (8) and compensation silicon photocell (5) are arranged in the right side, measurement chamber that described tester is used for the gas that enters measuring head is carried out the air-channel system of flow-dividing control, lens (2), diaphragm (7) and work silicon photocell (6) are positioned at the left side in described measurement chamber, and minute surface (4) is positioned at the central authorities in described measurement chamber.
The technical scheme of the Photoelectric Detection minute surface that the utility model is taked, allow tested gas enter the dew point chamber and to skim over minute surface with certain flow velocity, light is total reflection, by silicon photocell induction and output photoelectric signal to control loop, control loop is at first opened heating rod and is made liquid nitrogen vaporization, then minute surface is controlled thermoelectric refrigerating unit and is continued minute surface is freezed in certain temperature in the maintenance measuring head; When mirror temperature is down to the dewpoint temperature of tested gas, begin dewfall on the minute surface, illumination this moment diffuse reflection can occur after on the minute surface, silicon photocell is sensed reflected light signal and is changed, regulate the power supply of thermoelectric refrigerating unit through control loop, reduce its refrigeration work consumption, mirror temperature is equilibrated on the tested gas dew point temperature.
More than describing not is to be to restriction of the present utility model, can not assert that implementation of the present utility model can only be confined to above description content.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, the variation of proposition, remodeling, interpolation or replacement all belong to the utility model protection domain.
Claims (2)
1. the light path system of a chilled-mirror type dew point tester, be used for the dew point situation on the measuring head minute surface is detected, it is characterized in that, comprise: pointolite (1), its a part of light that sends shines compensation silicon photocell (5) by the screw that is in the light (8), another part rays pass through lens (2) becomes directional light and shines on the minute surface (4), and directional light at minute surface (4) reflection scioptics (3) occurs and focuses on the diaphragm (7); When on the minute surface (4) dew being arranged, be mapped to the directional light generation diffuse reflection of minute surface (4), directional light becomes diverging light scioptics (3) major part and leaked from diaphragm (7), be mapped on the work silicon photocell (6), work silicon photocell (6) is given light path modulate circuit in the described tester with this optical signal transmission.
2. the light path system of chilled-mirror type dew point tester according to claim 1, it is characterized in that, described pointolite (1), the screw that is in the light (8) and compensation silicon photocell (5) are arranged in the right side, measurement chamber that described tester is used for the gas that enters measuring head is carried out the air-channel system of flow-dividing control, lens (2), diaphragm (7) and work silicon photocell (6) are positioned at the left side in described measurement chamber, and minute surface (4) is positioned at the central authorities in described measurement chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352367 CN202710497U (en) | 2012-07-19 | 2012-07-19 | Light path system of cold mirror type dew point tester |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220352367 CN202710497U (en) | 2012-07-19 | 2012-07-19 | Light path system of cold mirror type dew point tester |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202710497U true CN202710497U (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220352367 Expired - Fee Related CN202710497U (en) | 2012-07-19 | 2012-07-19 | Light path system of cold mirror type dew point tester |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202710497U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501313A (en) * | 2016-10-12 | 2017-03-15 | 江苏鸿源动力科技有限公司 | A kind of chilled-mirror type dew point instrument of bimirror face double light path |
| CN110146546A (en) * | 2019-06-17 | 2019-08-20 | 秦燕 | A kind of chilled-mirror type dew point instrument automatic optoelectronic detection system |
-
2012
- 2012-07-19 CN CN 201220352367 patent/CN202710497U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106501313A (en) * | 2016-10-12 | 2017-03-15 | 江苏鸿源动力科技有限公司 | A kind of chilled-mirror type dew point instrument of bimirror face double light path |
| CN110146546A (en) * | 2019-06-17 | 2019-08-20 | 秦燕 | A kind of chilled-mirror type dew point instrument automatic optoelectronic detection system |
| CN110146546B (en) * | 2019-06-17 | 2022-01-18 | 深圳市一量检测有限公司 | Automatic photoelectric detection system of cold mirror type dew point instrument |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130130 Termination date: 20150719 |
|
| EXPY | Termination of patent right or utility model |