CN203534967U - Dew point temperature measuring instrument using double-camera image method - Google Patents
Dew point temperature measuring instrument using double-camera image method Download PDFInfo
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- CN203534967U CN203534967U CN201320585554.3U CN201320585554U CN203534967U CN 203534967 U CN203534967 U CN 203534967U CN 201320585554 U CN201320585554 U CN 201320585554U CN 203534967 U CN203534967 U CN 203534967U
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- minute surface
- dew point
- mirror surface
- point temperature
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Abstract
The utility model relates to the technical field of gas analysis measuring instruments, and provides a dew point temperature measuring instrument using a double-camera image method. The measuring instrument comprises a refrigeration device and a measuring chamber, wherein the measuring chamber is internally provided with a mirror surface; the mirror surface is connected with the refrigeration device; the temperature of the mirror surface is controlled by the refrigeration device; a temperature sensor is further arranged on the mirror surface; the dew point temperature measuring instrument using the double-camera image method further comprises a parallel light source, a first camera, a second camera and a control detection unit, wherein the incident light of the parallel light source and the mirror surface form an angle, the first camera is arranged in the direction of the incident light of the mirror surface, the second camera is arranged on other positions except incident light and reflected light; the control detection unit is used for controlling the refrigeration device to refrigerate the mirror surface, and used for recording the image change of the first camera and the second camera and the temperature of the temperature sensor. According to the measuring instrument, the dewing situation of the mirror surface can be observed in different angles through the double cameras, and the conclusion that whether the mirror surface is dewed is made by simply analyzing the image brightness and the shape characteristics.
Description
Technical field
The utility model relates to the surveying instrument technical field of gas analysis, particularly, relates to a kind of dual camera image method dew point temperature measurements instrument.
Background technology
Gas humidity refers to the content of water vapour in gas.Gas dew point temperature is one of humidity method for expressing that gas is conventional, referring to by isobaric cooling method makes the water vapour in gas be cooled to condensed phase appearance, or by controlling the temperature of Cold Mirrors face, make the water vapour in gas be thermodynamic equilibrium state with the flat surface of (condensed phase) minute surface cut-layer, measure accurately the dewpoint temperature that temperature is now this gas, the instrument of measurement gas dewpoint temperature is called dew point hygrometer.
The principle of work of existing chilled-mirror type dew point instrument is: when tested gas enters dewfall chamber, and skim over minute surface (mirror temperature is higher than the dewpoint temperature of this gas) with certain flow rate, dry minute surface by the incident light of light source near total reflection.When dew point hygrometer is measured, the signal controlling refrigerating plant first detecting according to detecting device, declines mirror temperature, in this process, by the variation of feedback signal, judges whether dewfall.During dewfall, record mirror temperature, this temperature is exactly the dew point value of gas to be measured.
At present most of light path system that adopts the chilled-mirror type dew point instrument of liquid nitrogen refrigerating all adopts single sensor devices mirror-reflection light to be measured as photoelectric cell, photodiode, photoresistance and photoelectric tube etc.This class methods reliability and anti-interference are poor, and general measure accuracy is ± 2 ℃.Modified version, such as double light path acquisition system, strengthens anti-interference, but aspect the judgements such as dewfall of minute surface pollutant, non-water substance, is lacking foundation.
Utility model content
For defect of the prior art, the purpose of this utility model is to provide a kind of dual camera image method dew point temperature measurements instrument, according to detecting the total reflection of minute surface and the variation of the formed minute surface picture feature of diffuse reflection, and judgement exposure, thus measure dewpoint temperature.
According to an aspect of the present utility model, a kind of dual camera image method dew point temperature measurements instrument is provided, comprise refrigerating plant and measure cavity, it is characterized in that, in described measurement cavity, minute surface is set, described minute surface is connected with described refrigerating plant, by described refrigerating plant, controlled the temperature of described minute surface, on described minute surface, go back set temperature sensor, described dual camera image method dew point temperature measurements instrument also comprises source of parallel light, the first camera, second camera and control detecting unit, the incident light of described source of parallel light and described minute surface are at an angle, described the first camera is set in the outgoing direction of light of minute surface, described second camera is arranged on except on described incident light and catoptrical other position, described control detecting unit is controlled described refrigerating plant described minute surface is freezed, and record described the first camera and the image change of second camera and the temperature of described temperature sensor.
Preferably, described measurement cavity comprises the end face of two relative inclined-planes and a level, described two inclined-planes equate with the angle of described minute surface, described source of parallel light and described the first camera are separately positioned on described two inclined-planes, described second camera is arranged on described end face, and described second camera is vertical with described minute surface.
Preferably, described refrigerating plant is liquid nitrogen refrigerating apparatus, and the gas in described measurement cavity is nitrogen, oxygen, helium, argon gas or sulfur hexafluoride.
Preferably, the incident angle of incident light is 30 to 60 degree.
Preferably, the incident angle of incident light is 45 degree.
Compared with prior art, the utlity model has following beneficial effect:
(1) adopt dual camera to observe from different perspectives minute surface condensation status, can draw the whether conclusion of exposure of minute surface by simple analysis brightness of image, shape facility, be quick on the draw;
(2) can promote image processing speed by high performance processor, fast to cooling rate, the cooling system that easily produces overshoot also can improve accuracy in detection;
(3) by mirror image being done to further feature extraction, can analyze the type of pollutant or dewfall;
Accompanying drawing explanation
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present utility model will become:
Fig. 1 is structural representation of the present utility model.
In figure: 1 is refrigerating plant, 2 for measuring cavity, and 3 is minute surface, and 4 is temperature sensor, and 5 is inclined-plane, and 6 is end face, and 7 is source of parallel light, and 8 is the first camera, and 9 is incident light, and 10 is emergent light, and 11 is second camera.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.Following examples will contribute to those skilled in the art further to understand the utility model, but not limit in any form the utility model.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement.These all belong to protection domain of the present utility model.
Referring to Fig. 1, dual camera image method dew point temperature measurements instrument is for measurement gas micro-moisture, for analyzing the image of the dew point tester of the gases such as nitrogen, oxygen, helium, argon gas and sulfur hexafluoride.It comprises refrigerating plant 1 and measures cavity 2, refrigerating plant can be selected the mode of liquid nitrogen refrigerating, measuring the interior minute surface 3 that arranges of cavity 2, minute surface 3 is connected with refrigerating plant 1, by refrigerating plant 1, controlled the temperature of minute surface 3, on minute surface, go back set temperature sensor 4, measurement cavity 2 is comprised of the end face 6 of two relative inclined-planes 5 and a level, two inclined-planes 5 equate with the angle of minute surface 3, two inclined-planes on a source of parallel light 7 and the first camera 8 are set respectively, the incident light 9 of source of parallel light 7 and minute surface 3 are at an angle, the first camera 8 is positioned in the direction of the emergent light 10 on minute surface 3.Angle between two inclined-planes 5 and minute surface 2 is 30 to 60 degree, preferably 45 degree.Second camera 11 is set on end face 6, and second camera 11 is vertical with minute surface 3, also can be with minute surface 3 at angle, only otherwise be positioned in the direction of incident 9 and emergent light 10.This device is undertaken dewpoint temperature to detect by controlling detecting unit, and equipment is controlled.Control detecting unit and control 1 pair of minute surface of refrigerating plant, 3 refrigeration, and record the image change of the first camera 8 and second camera 11 and the temperature of temperature sensor 4.
Operation detection process of the present utility model is, controlling detecting unit drives source of parallel light to irradiate a branch of thinner directional light to minute surface, and receive the image of the first camera and second camera, because incident light directly enters the first camera after mirror-reflection, the first camera obtains the bright image of minute surface, and the just irreflexive image of minute surface that second camera collects, because there is no light source direct projection, image can be darker.Control detecting unit and control refrigerating plant minute surface is freezed, the temperature of light microscopic face is low to a certain extent time, minute surface dewfall, at this moment, the diffuse reflection of minute surface is enhanced, and it is dim that the image ratio of the first camera became originally, and the image of second camera can brighten, and the luminous point that has little dewdrop to reflect.Control detecting unit records two camera image data, feature when initial, and the temperature of temperature sensor, in to minute surface process of refrigerastion, in real time to the new data analysis gathering of two cameras.When calculating the brightness of image of the first camera, change over predetermined threshold value, can judge dewfall; When the image outline that calculates second camera changes, also can judge dewfall.Distinguishing occasion or the judgement minute surface pollution condition of dew point, frost point, while even analyzing dewfall material, can use the part that mirror image feature is changed further to calculate, analyze the shape of minute surface material, thereby reach a conclusion.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned specific implementations, and those skilled in the art can make various distortion or modification within the scope of the claims, and this does not affect flesh and blood of the present utility model.
Claims (5)
1. a dual camera image method dew point temperature measurements instrument, comprise refrigerating plant and measure cavity, in described measurement cavity, minute surface is set, described minute surface is connected with described refrigerating plant, by described refrigerating plant, controlled the temperature of described minute surface, on described minute surface, go back set temperature sensor, it is characterized in that, described dual camera image method dew point temperature measurements instrument also comprises source of parallel light, the first camera, second camera and control detecting unit, the incident light of described source of parallel light and described minute surface are at an angle, described the first camera is set in the outgoing direction of light of minute surface, described second camera is arranged on except on described incident light and catoptrical other position, described control detecting unit is controlled described refrigerating plant described minute surface is freezed, and record described the first camera and the image change of second camera and the temperature of described temperature sensor.
2. dual camera image method dew point temperature measurements instrument according to claim 1, it is characterized in that, described measurement cavity comprises the end face of two relative inclined-planes and a level, described two inclined-planes equate with the angle of described minute surface, described source of parallel light and described the first camera are separately positioned on described two inclined-planes, described second camera is arranged on described end face, and described second camera is vertical with described minute surface.
3. dual camera image method dew point temperature measurements instrument according to claim 1, is characterized in that, described refrigerating plant is liquid nitrogen refrigerating apparatus, and the gas in described measurement cavity is nitrogen, oxygen, helium, argon gas or sulfur hexafluoride.
4. according to the dual camera image method dew point temperature measurements instrument described in any one in claims 1 to 3, it is characterized in that, the incident angle of incident light is 30 to 60 degree.
5. dual camera image method dew point temperature measurements instrument according to claim 4, is characterized in that, the incident angle of incident light is 45 degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320585554.3U CN203534967U (en) | 2013-09-22 | 2013-09-22 | Dew point temperature measuring instrument using double-camera image method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320585554.3U CN203534967U (en) | 2013-09-22 | 2013-09-22 | Dew point temperature measuring instrument using double-camera image method |
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| Publication Number | Publication Date |
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| CN203534967U true CN203534967U (en) | 2014-04-09 |
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| CN201320585554.3U Expired - Fee Related CN203534967U (en) | 2013-09-22 | 2013-09-22 | Dew point temperature measuring instrument using double-camera image method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105158294A (en) * | 2015-10-29 | 2015-12-16 | 大庆市日上仪器制造有限公司 | Device for measuring dew point through camera |
| CN105181747A (en) * | 2015-10-14 | 2015-12-23 | 国网新疆电力公司检修公司 | Detecting and cleaning device applicable to chilled-mirror dew-point hygrometer mirror surface and application |
| CN106468667A (en) * | 2015-08-17 | 2017-03-01 | 财团法人工业技术研究院 | High-reflection surface condensation measuring system and method |
| CN113567498A (en) * | 2021-07-28 | 2021-10-29 | 南京信息工程大学 | Dew point meter integrating video detection and optical detection and control method |
| CN113804605A (en) * | 2021-08-26 | 2021-12-17 | 南京信息工程大学 | Three-dimensional raindrop spectrometer based on light field shooting technology and operation process and application thereof |
-
2013
- 2013-09-22 CN CN201320585554.3U patent/CN203534967U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106468667A (en) * | 2015-08-17 | 2017-03-01 | 财团法人工业技术研究院 | High-reflection surface condensation measuring system and method |
| CN105181747A (en) * | 2015-10-14 | 2015-12-23 | 国网新疆电力公司检修公司 | Detecting and cleaning device applicable to chilled-mirror dew-point hygrometer mirror surface and application |
| CN105181747B (en) * | 2015-10-14 | 2018-08-14 | 国网新疆电力公司检修公司 | A kind of detection cleaning device being applicable in chilled-mirror precise dew-point hygrometer minute surface and application |
| CN105158294A (en) * | 2015-10-29 | 2015-12-16 | 大庆市日上仪器制造有限公司 | Device for measuring dew point through camera |
| CN113567498A (en) * | 2021-07-28 | 2021-10-29 | 南京信息工程大学 | Dew point meter integrating video detection and optical detection and control method |
| CN113804605A (en) * | 2021-08-26 | 2021-12-17 | 南京信息工程大学 | Three-dimensional raindrop spectrometer based on light field shooting technology and operation process and application thereof |
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| Date | Code | Title | Description |
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| 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: 20140409 Termination date: 20150922 |
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| EXPY | Termination of patent right or utility model |