CN101236166A - Chilled-mirror type dew point instrument control method - Google Patents
Chilled-mirror type dew point instrument control method Download PDFInfo
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- CN101236166A CN101236166A CNA2008100072057A CN200810007205A CN101236166A CN 101236166 A CN101236166 A CN 101236166A CN A2008100072057 A CNA2008100072057 A CN A2008100072057A CN 200810007205 A CN200810007205 A CN 200810007205A CN 101236166 A CN101236166 A CN 101236166A
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Abstract
A cold mirror type dew point instrument is used to measure the dew point. Under the conditions of a high-temperature operational environment or measuring low-humidity gas or measuring low-humidity gas in a high-temperature environment or manual misoperation, a system oscillation will be caused by system control maladjustment and consequently the dew point is hard to be measured or can not be measured. The control method provided by the invention can set a corresponding current regulation step length according to the luminous energy deviation or the different intervals of luminous energy deviation change ratio in the process of dew elimination, regulate the size of the refrigeration current through adding or deducting a current value equal to the step length to the present refrigeration current to control the mirror surface temperature for controlling the thickness of a frost layer, and consequently the luminous energy is enabled to gradually approach a target value. That is to say, the frost layer on the mirror surface gradually approaches the specific thickness, thereby eliminating the oscillation brought about by the system control maladjustment. The method can finely adjust and control the thickness of the mirror surface frost layer during dew elimination, thereby avoiding the system oscillation or stopping the system oscillation, and realizing the dew point measurement which is hard to be realized or can not be realized in the prior art.
Description
Technical field
The present invention relates to a kind of control method of chilled-mirror type dew point instrument, relate to a kind of method of eliminating the system oscillation that occurs because of the control imbalance in the chilled-mirror type dew point instrument that is applied in or rather.
Background technology
The principle that chilled-mirror type dew point instrument is measured dew point is: a branch of light source irradiation receives its reflected light by the photoelectric sensor receiving tube to the minute surface of scraping of temperature controllable.When mirror surface cleaning was dry, its reflected light maximum was promptly launched light and is received by 100% reflection and by the photoelectric sensor receiving tube.When condensate water was divided into frost layer on the minute surface, utilizing emitted light was scattered, thereby the intensity of reflected light that receives weakens.This reception signal relatively amplifies by the A/D conversion sends into processor, controls afterwards as calculated the refrigeration electric current of refrigeration pump, thus the control mirror temperature; Make minute surface remain on certain temperature, this moment, the minute surface frost layer kept certain thickness, when keeping this thickness frost layer, the energy of reflection light that the photoelectric sensor receiving tube receives loses to desired value, be that steam in the gas is condensed into frost and reaches the state of balancing each other at minute surface, keeping frost layer is a specific thicknesses, this moment minute surface temperature by temperature sensor measurement and be recorded as the dew point of tested gas.
At present, dew point hygrometer on the market roughly has two kinds of control methods of measuring dew point, and PID regulates and fuzzy control method.Wherein PID is adjusted to the regulative mode of fixed proportion, integration and differential coefficient, owing in whole measuring process, adopt invariable parameter value, so system's adaptive faculty is relatively poor, measuring process class damped oscillation waveform, vibration causes Measuring Time long repeatedly.Fuzzy control be within the specific limits control with changed scale, become integration and become the regulative mode of differential coefficient, can the oneself adjust parameter according to the instrument system response, adaptability is better, measuring process system oscillation is few, Measuring Time is short.But above two kinds of methods all at some in particular cases, as working under the hot environment or measuring under low humidity gas or the hot environment that to measure low humidity gas and manual operation improper and when causing system oscillation, be difficult to maybe can't measure dew point.Cause the reason of system oscillation to be mainly:, certain hysteresis quality to be arranged though the formation of minute surface frost layer is proportionate with cold pump cold junction temperature.When frost layer is blocked up, can cause the outage of cold pump, cold junction temperature raises fast, and is very dry by the gas of minute surface, hydrone minute surface condense speed less than the speed of escaping from minute surface, frost layer is with attenuation; Although electric current Fast recovery when being about to reach the specific thicknesses frost layer can not rapid decrease because of mirror temperature, will cause frost layer to become thin even disappear.This moment, cold pump startup was forced rapidly coldly, and the minute surface frost layer of condensing rapidly causes the dewfall frost layer blocked up again, goes round and begins again.Especially under hot environment, because cold pump hot junction thermal accumlation, row's difficulty of loosing, cold pump refrigerating capacity descends gradually, and sometimes even be difficult to make cold junction again to freeze to the temperature that is lower than dew point, dew point is difficult to maybe can't measure.
Summary of the invention
The technical problem to be solved in the present invention provides system oscillation appears in a kind of elimination because of the control imbalance method, the thickness of minute surface frost layer during its energy finely regulating dew eliminating, thereby stop the unbalance of system vibration, the dew point measurement that is difficult to before making it maybe can't measure is achieved.
Control method of the present invention is, in the dew eliminating process, adjust step-length according to the electric current that the different interval setting of light energy deviation and light energy deviation variation rate is corresponding, and the current value that equals this step-length by adding deduct at current refrigeration electric current is adjusted the size of refrigeration electric current, the control mirror temperature is with the control frost thickness, make light energy approach gradually desired value, namely, make the frost layer on the minute surface approach gradually specific thicknesses, the system oscillation that occurs thereby the control of elimination system is lacked of proper care, the thickness of minute surface frost layer during the method energy finely regulating dew eliminating.
After adopting this method, instrument is worked under hot environment or is measured under low humidity gas or the hot environment and measures that low humidity gas and manual operation are improper will to cause or during the initiating system vibration continuation that the method can stop the generation of system oscillation or stop vibrating.
This method can be used on PID control, fuzzy control and artificial intelligence control etc. and can record in the control method of dew point.
Description of drawings
Below in conjunction with drawings and embodiments the present invention is described in further detail.
Fig. 1 is the diagrammatic cross-section of chilled-mirror type dew point instrument dew point measuring chamber.
Fig. 2 is this method control flow synoptic diagram.
Fig. 3 be this method and other measure the dew point methods in conjunction with schematic diagram.
Waveform schematic diagram when Fig. 4 eliminates system oscillation for unbalance of system vibration and when adopting this law.
Embodiment
Fig. 1 is chilled-mirror type dew point instrument dew point measurement chamber generalized section, luminous tube 1 utilizing emitted light, and cold pump 4 refrigeration, tested gas skims over minute surface, and forms frost layer at minute surface 3, and receiving tube 2 receives reflection or scattered light.The luminous energy that the thickness effect receiving tube 2 of minute surface 3 frost layers receives.This method is for after carrying out data operation by processor 5, thereby the electric current of progressively controlling refrigeration pump 4 is accurately controlled the method for minute surface 3 temperature with the control frost thickness.
Fig. 2 and Fig. 3 illustrate this law progressively schematic flow sheet of Control current and the schematic flow sheet when being used in combination with other measuring methods, respond to the luminous energy of reflection of frost layer or scattering and export electric signal by photoelectric sensor receiving tube 2, the processor constant duration is gathered through the A/D electrical signal converted, calculates the deviation E of current luminous energy and luminous energy desired value and the rate of change Δ E of E.Wherein, if adopt other measuring methods can finish measurement, as, no system oscillation then need not to enable the method; If can't finish measurement, and E is during less than preset value Eopen, that is, in the blocked up situation of frost layer, can enable the method: processor is set the different E different electric current step-length ISs corresponding with Δ E; Among Fig. 2, E is divided into m interval, Δ E is divided into n interval, therefore, available electric current step-length has m to take advantage of n, step-length IS size and what can be according to the actual conditions settings, and add or deduct the current analog signal of step-length IS at current refrigeration electric current by D/A output, thereby cause the increase of cold pump 4 refrigeration electric currents or reduce, cause the slow variation of mirror temperature, make the minute surface frost thickness approach gradually specific thicknesses, specific thicknesses is light energy that receiving tube receives when reaching the target light energy value, hydrone minute surface condense speed equal to escape from minute surface speed the time thickness; When E value during greater than preset value Eclose, that is, frost layer is near specific thicknesses, system returns to former measuring method automatically, at this moment, but the just thickness of fast and stable frost layer of system.Wherein, preset value Eopen and Eclose need according to actual conditions settings such as instrument performances, and Eopen＜Eclose＜0.Among the figure, Am is the interval of E, A1＜A2＜Am＜0 (m＞=2), and Bmn is the interval of Δ E, Bm1＜Bm2＜Bmn＜0 (n＞=2), Cmn is the output current step value.
Wherein, other measuring methods comprise that PID control, fuzzy control, artificial intelligence control etc. can record the method for dew point.
Among Fig. 4, ordinate be temperature T (℃), horizontal ordinate is time t (s), does not have the exemplary waveforms of middle humidification when dotted line is depicted as system oscillation.If middle humidification is arranged, then there is not the stand-by period, i.e. the horizontal component at dashed line free middle part, the similar process of the last peak of direct repeat type ripple, repeatedly vibration.Solid line has prevented from making system's fast and stable because of the regeneration of system's control imbalance vibration peak shape ripple for adopting the exemplary waveforms of this method elimination system control imbalance, records as early as possible dew point value.
Claims (5)
1. the control method of a chilled-mirror type dew point instrument, when being applied to system's control imbalance initiating system vibration, it is characterized in that: in the dew process that disappears, the corresponding electric current of different interval setting according to luminous energy deviation and luminous energy deviation variation rate is adjusted the size that step-length is adjusted the refrigeration electric current, make luminous energy approach desired value gradually, make the frost layer near specific thicknesses.
2. in the control method of the described chilled-mirror type dew point instrument of claim 1, the situation of described system control imbalance initiating system vibration comprises: measurement low humidity gas and manual operation are improper under high-temperature work environment, measurement low humidity gas, the hot environment.
3. in the control method of the described chilled-mirror type dew point instrument of claim 1, described specific thicknesses is: when the luminous energy that receiving tube received reached the target light energy value, water vapor condensation in the gas became frost and reaches when balancing each other state the thickness of frost layer on the minute surface.
4. in the control method of the described chilled-mirror type dew point instrument of claim 1, the corresponding electric current of described setting is adjusted size that step-length adjusts the refrigeration electric current and is the size of the current value adjustment refrigeration electric current that equals this step-length by adding deduct at current refrigeration electric current.
5. in the claim 1 to 5 in the control method of any described chilled-mirror type dew point instrument, describedly be controlled to be in PID control, fuzzy control, the artificial intelligence control any one.
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| CN2008100072057A CN101236166B (en) | 2008-02-19 | 2008-02-19 | Chilled-mirror type dew point instrument control method |
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| CN2008100072057A CN101236166B (en) | 2008-02-19 | 2008-02-19 | Chilled-mirror type dew point instrument control method |
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| CN101236166B CN101236166B (en) | 2010-06-02 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636519A (en) * | 2011-02-12 | 2012-08-15 | 北京兴泰学成仪器有限公司 | Method and device for rapidly and accurately determining dew point of low-humidity gas |
| CN103245695A (en) * | 2013-04-25 | 2013-08-14 | 南京信息工程大学 | High-precision dew point measuring device and detection method based on same |
| CN106706708A (en) * | 2015-11-16 | 2017-05-24 | 杨斌 | Control method of rapid high-precision cold mirror type dew-point instrument |
| 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 |
| CN110146546A (en) * | 2019-06-17 | 2019-08-20 | 秦燕 | A kind of chilled-mirror type dew point instrument automatic optoelectronic detection system |
| CN110488792A (en) * | 2019-06-28 | 2019-11-22 | 石家庄市植物园管理处 | A kind of oscillation recognition methods of thermoelectricity production process and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101004397B (en) * | 2007-01-16 | 2010-10-06 | 丁五行 | Intellectualized, rapid measuring cold mirror dew point instrument |
-
2008
- 2008-02-19 CN CN2008100072057A patent/CN101236166B/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636519A (en) * | 2011-02-12 | 2012-08-15 | 北京兴泰学成仪器有限公司 | Method and device for rapidly and accurately determining dew point of low-humidity gas |
| CN103245695A (en) * | 2013-04-25 | 2013-08-14 | 南京信息工程大学 | High-precision dew point measuring device and detection method based on same |
| CN103245695B (en) * | 2013-04-25 | 2015-02-04 | 南京信息工程大学 | High-precision dew point measuring device and detection method based on same |
| CN106706708A (en) * | 2015-11-16 | 2017-05-24 | 杨斌 | Control method of rapid high-precision cold mirror type dew-point instrument |
| 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 |
| 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 |
| CN110488792A (en) * | 2019-06-28 | 2019-11-22 | 石家庄市植物园管理处 | A kind of oscillation recognition methods of thermoelectricity production process and device |
| CN110488792B (en) * | 2019-06-28 | 2021-08-24 | 石家庄市植物园管理处 | Oscillation identification method and device in thermal power production process |
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| CN101236166B (en) | 2010-06-02 |
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