CN201796000U - Rapid precision mirror dew-point hygrometer - Google Patents
Rapid precision mirror dew-point hygrometer Download PDFInfo
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- CN201796000U CN201796000U CN2010201974198U CN201020197419U CN201796000U CN 201796000 U CN201796000 U CN 201796000U CN 2010201974198 U CN2010201974198 U CN 2010201974198U CN 201020197419 U CN201020197419 U CN 201020197419U CN 201796000 U CN201796000 U CN 201796000U
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Abstract
The utility model provides a rapid precision mirror dew-point hygrometer, which is characterized in that an optoelectronic system catches catastrophic phenomenon of dew condensation in real time during the process of mirror temperature reduction so as to determine the dew point in advance, and determines mirror temperature through controlling ratio of emitted and reflected light energy of an optoelectronic detecting system, thereby accurately measuring the dew point. The rapid precision mirror dew-point hygrometer determines the dew point during primary dew condensation, and does not determine the dew point during dew elimination after completely dewing like a traditional instrument, thereby being capable of greatly shortening the balance time, and measuring low-humidity gas without a humidifying device. The rapid precision mirror dew-point hygrometer greatly improves a dew point determiantion system and a control system, thereby greatly increasing the measuring speed and precision and expanding range of instruments.
Description
Technical field
The utility model relates to a kind of instrument of fast measuring dew point, is particularly suitable for the rapid and accurate determination of low humidity gas moisture under hot environment.
Background technology
The mirror surface type dew point hygrometer is a kind of typical photoelectric dew-point hygrometer.It is made up of dew point chamber, refrigeration system, photodetector system, temp measuring system and control system.Its measuring principle and process are: the sample air-flow is through the condensation mirror of dew point chamber, freeze by equipressure, make the sample gas dewfall state (having drop to separate out on the condensation mirror) that reaches capacity, judge the dewfall degree, adjust refrigeration system by control system and make cut-layer thickness reach fixed value by electro-optical system.The temperature that temp measuring system is measured is the dew point of sample gas.The major advantage of this method is the precision height, uncertainty even can reach 0.1 ℃; Shortcoming is that response speed is slower, especially below dew point-60 ℃, and equilibration time even reach several hrs, and also the method requires also higherly to the spatter property of sample gas and corrosivity, otherwise can influence the Photoelectric Detection effect or generation ' pseudo-dewfall ' causes measuring error.
At present, mirror surface type dew point hygrometer on the market roughly has three kinds.A kind of is traditional dew point hygrometer (similar Chinese patent 93204187.6 described), it is when measuring low humidity gas, minute surface dewfall/frost reaches that to set the thickness time long, and about 45 minutes of one-shot measurement deadline is for the extremely low gas of humidity even can not finish measurement.Another kind of instrument adds auxiliary humidification device (United States Patent (USP) 5139344) at this problem, and by shortening equilibration time to low humid gas auxiliary humidification, minute can foreshorten to 10-15 minute like this.Yet for unknown gas since humidification amount and add wet point and be difficult to accurate control cause system oscillation easily, thereby prolong stabilization time.The third method is as described in the U.S. Pat 5971609, at first allow and measure the complete dewfall/frost of moisture in the gas, adjustment by the Cold Mirrors temperature is then found out dewfall/white thickness and is reached maximum temperature when hour detected luminous energy signal is consistent as dewpoint temperature.Whole mensuration process is the characteristics of damped oscillation, and it is consuming time longer to finish mensuration.In addition, existing measurement to dew point adopts the DSP fuzzy controller to improve measuring speed and measuring accuracy as described in Chinese utility model patent 200720103239.7 and patent of invention (application number 200810007205).More than several minute surface dew point hygrometers all be behind the abundant dewfall/frost of moisture in making gas to be measured, to control mirror temperature, eliminate too much frosting and make dew/frost thickness reach setting value, measure dew point.For low humid gas, required refrigerating capacity is big, and the time that reaches abundant dewfall/frost is longer, and some method may all can't reach particular value and can not finish mensuration owing to dewfall/white thickness.
Therefore, the mensuration that how to realize the dew point of different moisture levels gas rapidly and accurately becomes the difficult problem that industry needs to be resolved hurrily.
The utility model content
For addressing the above problem, the utility model provides the precision mirror surface dew point hygrometer of the low humid gas moisture of a kind of rapid and precise mensuration.Dew point judgement and control system to existing chilled-mirror type dew point instrument have been done very big improvement.
The fast precise minute surface dew point hygrometer that the utility model provides is by refrigeration system, air-channel system, dew point chamber, photodetector system, and temp measuring system and control system are formed.Refrigeration system is fast to the minute surface refrigeration, and adjustment refrigeration electric current is further accurately adjusted cryogenic temperature under the control of control system; Photodetector system is monitored dewfall phenomenon first, and will this moment emission light and catoptrical energy ratio as actual dew point basis for estimation; Control system is coordinated refrigeration system and photodetector system, makes the rapid balance of dewfall process; Temp measuring system utilizes platinum resistance accurately to measure mirror temperature under the equilibrium state.
Refrigeration system comprises the cold pump of level Four, heat pipe, fan and refrigeration circuit, and its mirror temperature to described photodetector system carries out quick control.
Photodetector system comprises luminotron, minute surface, receiving tube and testing circuit, and it detects in real time and control emission light and catoptrical energy.
Control system adopts the chaos controlling technology, makes mirror temperature reach the actual dew point of gas to be measured rapidly by coordinating photodetector system and refrigeration system.
Fast precise minute surface dew point hygrometer of the present utility model, be to the minute surface fast-refrigerating by cold pump, when mirror temperature is lower than the dew point of gas of the dew point chamber of flowing through, moisture in the gas is in the minute surface dewfall, photodetector system captures the transition of luminous energy this moment in real time, and control system indication temp measuring system is measured the temperature of minute surface this moment, and adjusts refrigeration system and photodetector system, the quick control mirror temperature reaches condensation speed and the velocity of escape of gas to be measured on minute surface and equates.Mirror temperature under the last temp measuring system mensuration equilibrium state is the dewpoint temperature of gas to be measured.
Characteristics of the present utility model are to come anticipation dew point in advance in the dewfall process, and control the process of refrigerastion of refrigeration system in advance, by controlling the condensation speed of moisture on minute surface and the next dew point of further accurately measuring of balance of velocity of escape in the gas to be measured.But not disappearing after abundant dewfall, other minute surface dew point hygrometers measure in the dew process.So just can shorten the time greatly, also not need the auxiliary humidification device, reduce the complexity of system, help improving the stability and the degree of accuracy of control for the mensuration of low humidity gas.
Description of drawings
Fig. 1 is a composition schematic block diagram of the present utility model
Exemplary waveforms figure when Fig. 2 is the utility model and traditional dew point hygrometer and auxiliary humidification dew point hygrometer mensuration dew point
Embodiment
Further specify embodiment of the present utility model below in conjunction with accompanying drawing and instantiation.Those skilled in the art can understand function of the present utility model and advantage by the content that this explanation disclosed.The utility model also can be implemented or used by other different concrete example.
Fast precise minute surface dew point hygrometer described in the utility model can be used for the determination of moisture of electric system high-voltage switch gear insulating gas SF6.
Fig. 1 is a block diagram of the present utility model.As shown in the figure, this minute surface dew point hygrometer core component comprises the photodetector system of being made up of power valve (1), minute surface (3), receiving tube (2) and testing circuit (11); The refrigeration system of being formed by the cold pump of level Four (5), heat pipe (6), fan (7) and refrigeration circuit (13); The temp measuring system of being formed by platinum resistance (4) and temperature measurement circuit (12); And being that by central processing unit (19) the control core system constitutes. the utility model also comprises the air-channel system of being made up of gas circuit pipe, flowmeter (8) and testing circuit (9), and the external unit that some input and output are used comprises keyboard (14), very color LCDs (15), printer (16), sound circuit (17), USB interface (18) etc.
In present embodiment, air-channel system of the present utility model is connected with the insulating gas of high-voltage switch gear, under constant compression force, SF6 gas is with flow through polishing minute surface (3) in the dew point chamber of certain flow, the temperature of this minute surface reduces rapidly by the cold pump of level Four (5) refrigeration under the control of control system (19), and the heat that the cold pump of level Four is produced dissipates by heat pipe (6) and fan (7).The Photoelectric Detection system that power valve (1), minute surface (3), receiving tube (2) and testing circuit (11) are formed detects the dewfall state of minute surface in temperature-fall period in real time, when control system (19) in time writes down the first dewfall of minute surface the luminous energy state, by adjusting the refrigeration electric current of refrigeration circuit (13), the temperature of control minute surface, make the mirror temperature fine setting, reach the balance of minute surface moisture dewfall and escape rapidly.Temp measuring system is by being embedded in the temperature of platinum resistance (4) micrometric measurement minute surface this moment in the minute surface, and this temperature is the dewpoint temperature of gas.The calculating that the dewpoint temperature of measuring is advanced CPU (central processing unit), the temperature variation oscillogram of demonstration absolute water content and whole measuring process on display screen.
Fig. 2 adopts minute surface dew point hygrometer provided by the utility model, traditional mirror dew point hygrometer and has the exemplary waveforms figure that auxiliary humidification device dew point hygrometer is measured low humid gas moisture.The fast precise minute surface dew point hygrometer that adopts the utility model to provide does not have the concussion adjustment process of mirror temperature when measuring, just reach balance at short notice, and dew point that can fast measuring gas is accelerated finding speed greatly, and do not needed the auxiliary humidification device.
Claims (4)
1. fast precise minute surface dew point hygrometer, it is characterized in that, comprise refrigeration system, air-channel system, dew point chamber, photodetector system, temp measuring system and control system, described refrigeration system is fast to the minute surface refrigeration, and adjustment refrigeration electric current is further accurately adjusted cryogenic temperature under the control of control system; Described photodetector system is monitored dewfall phenomenon first, and will this moment emission light and catoptrical energy ratio as actual dew point basis for estimation; Described control system is coordinated refrigeration system and photodetector system, makes the rapid balance of dewfall process; Described temp measuring system utilizes platinum resistance accurately to measure mirror temperature under the equilibrium state.
2. fast precise minute surface dew point hygrometer according to claim 1 is characterized in that described refrigeration system comprises the cold pump of level Four, heat pipe, fan and refrigeration circuit, and its mirror temperature to described photodetector system carries out quick control.
3. fast precise minute surface dew point hygrometer according to claim 1 is characterized in that described photodetector system comprises luminotron, minute surface, receiving tube and testing circuit, and it detects in real time and control emission light and catoptrical energy.
4. fast precise minute surface dew point hygrometer according to claim 1 is characterized in that, described control system adopts the chaos controlling technology, makes mirror temperature reach the actual dew point of gas to be measured rapidly by coordinating photodetector system and refrigeration system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201974198U CN201796000U (en) | 2010-05-20 | 2010-05-20 | Rapid precision mirror dew-point hygrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201974198U CN201796000U (en) | 2010-05-20 | 2010-05-20 | Rapid precision mirror dew-point hygrometer |
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| Publication Number | Publication Date |
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| CN201796000U true CN201796000U (en) | 2011-04-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010201974198U Expired - Fee Related CN201796000U (en) | 2010-05-20 | 2010-05-20 | Rapid precision mirror dew-point hygrometer |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018207A (en) * | 2012-10-18 | 2013-04-03 | 常州鸿源动力科技有限公司 | Chilled-mirror dew-point hygrometer based on Stirling low temperature refrigerator |
| CN109085201A (en) * | 2018-09-12 | 2018-12-25 | 南京信息工程大学 | A kind of ultra-low humidity dew point hygrometer and its temprature control method |
| CN116559093A (en) * | 2023-07-10 | 2023-08-08 | 广州兰泰仪器有限公司 | Gas moisture determination method and system |
-
2010
- 2010-05-20 CN CN2010201974198U patent/CN201796000U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103018207A (en) * | 2012-10-18 | 2013-04-03 | 常州鸿源动力科技有限公司 | Chilled-mirror dew-point hygrometer based on Stirling low temperature refrigerator |
| CN109085201A (en) * | 2018-09-12 | 2018-12-25 | 南京信息工程大学 | A kind of ultra-low humidity dew point hygrometer and its temprature control method |
| CN109085201B (en) * | 2018-09-12 | 2023-09-15 | 南京信息工程大学 | Ultralow humidity dew point meter and temperature control method thereof |
| CN116559093A (en) * | 2023-07-10 | 2023-08-08 | 广州兰泰仪器有限公司 | Gas moisture determination method and system |
| CN116559093B (en) * | 2023-07-10 | 2023-09-15 | 广州兰泰仪器有限公司 | Gas moisture determination method and system |
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| C14 | Grant of patent or utility model | ||
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Address after: 101102, Tongzhou District Jinqiao technology industry base, Beijing, 13 South four street, 2DF3A Patentee after: Beijing Sintai Xuecheng Instruments Co., Ltd. Address before: 100016, 501, Chaoyang District Road, Jiuxianqiao, Beijing, Kim Tae Lida, room four Patentee before: Beijing Sintai Xuecheng Instruments Co., Ltd. |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Sintai Xuecheng Instruments Co., Ltd. Zhang Xiao Document name: Notification of Passing Examination on Formalities |
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| DD01 | Delivery of document by public notice |
Addressee: Beijing Sintai Xuecheng Instruments Co., Ltd. Document name: Notification to Pay the Fees |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110413 Termination date: 20180520 |
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| CF01 | Termination of patent right due to non-payment of annual fee |