CN208860779U - A kind of ultra-low humidity dew point hygrometer - Google Patents
A kind of ultra-low humidity dew point hygrometer Download PDFInfo
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- CN208860779U CN208860779U CN201821488517.XU CN201821488517U CN208860779U CN 208860779 U CN208860779 U CN 208860779U CN 201821488517 U CN201821488517 U CN 201821488517U CN 208860779 U CN208860779 U CN 208860779U
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- dew point
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Abstract
The utility model discloses a kind of ultra-low humidity dew point hygrometer, belongs to meteorological detection technique field.Including main control module, refrigeration module, temperature measurement module, optical module, main control module is connected with other each modules, main control module includes stm32 microcontroller, power bridge heap, telecommunication circuit, refrigeration module is stacked by level Four semiconductor chilling plate into level Four refrigeration heap, temperature measurement module is high-precision thermometer, optical module is made of laser, bright and clean mirror surface, lens, photoelectric sensor, and the bright and clean mirror surface of optical module is placed on the level Four refrigeration heap of cold module, and level Four refrigeration is stacked on radiator.It can achieve the effect that temperature control by controlling light intensity when use, reflective light intensity is inputted in dynamic PID controller, duty ratio is changed according to PID output quantity to control the refrigeration of level Four refrigeration module.Have many advantages, such as effectively accelerate cooling system speed, greatly shortens the dew point temperature measurements time, improves system response time and measurement accuracy, expansion dew point hygrometer measurement range.
Description
Technical field
The utility model relates to a kind of ultra-low humidity dew point hygrometers, more particularly to a kind of includes main control module, refrigeration module, thermometric
Module, the ultra-low humidity dew point hygrometer of optical module and control reflective light intensity reach the control method of temperature control effect, belong to meteorology
Detection technique field.
Background technique
Chilled-mirror type dew point instrument is a kind of most popular moisture instruments, has the advantages that precision is high, stability is good,
But chilled-mirror type dew point instrument process of refrigerastion is slow, needs the longer Job readiness time.The present invention uses a kind of control reflected light
The strong control method to reach temperature control effect, can effectively accelerate the measuring speed of dew-point temperature；By effective temperature control method, mention
The high detection accuracy of dew-point temperature；By the application of level Four semiconductor refrigerating heap, ultralow dew-point temperature can detecte.Cause
This has the characteristics that precision is high, stability is good, ultra-low dew point.
Summary of the invention
The technical problems to be solved in the utility model is, Job readiness slow for existing chilled-mirror type dew point instrument process of refrigerastion
The disadvantage of time length, proposes a kind of ultra-low humidity dew point hygrometer, improves to PID control, and temperature is introduced on the basis of controlling light intensity
Adjustment parameter is spent, effectively accelerates cooling system speed, greatly shortens the time of measuring of dew-point temperature, and expand the survey of dew point hygrometer
Range is measured, realizes the measurement of some ultra-low dew points.
In order to solve the above technical problems, the utility model provides a kind of ultra-low humidity dew point hygrometer, including main control module, refrigeration mould
Block, temperature measurement module, optical module, main control module are connected with other each modules, complete the master control of each module；The main control module packet
Stm32 microcontroller, power bridge heap, telecommunication circuit are included, and the control to each module is implemented by conventional programming；The refrigeration mould
Block is stacked into level Four refrigeration heap by level Four semiconductor chilling plate, and is dropped by main control module control to optical module (Cold Mirrors)
Temperature can apply reverse current heating as needed to the ultralow temperature angle value needed for it to eliminate the dew drop of condensation or frosting；It is described
Temperature measurement module is made of high-precision thermometer, and Miniature temperature sensing element is embedded into bright and clean mirror surface (the metal light of optical module
Clean mirror surface) inside；The optical module is made of laser, bright and clean mirror surface, lens, photoelectric sensor, be placed in one it is impermeable
In the space of light, laser emits laser to mirror surface, thereafter ties reflected light by sending photoelectric sensor to detect after lens focus
Reveal the enhancing of back reflection light；The bright and clean mirror surface of the optical module is placed on the level Four refrigeration heap of cold module, and level Four refrigeration is stacked
It is placed on radiator.
The bright and clean mirror surface and level Four refrigeration heap and radiator between is coated with common heat-conducting silicone grease, as DOW CORNING,
HASUNCAST, SHIN-ETSU HANTOTAI etc..
This ultra-low humidity dew point hygrometer in use, by control light intensity achieve the effect that temperature control, reflective light intensity is inputted into dynamic PID
In controller, duty ratio is changed according to PID output quantity to control the refrigeration of level Four refrigeration module；By the laser of the optical module
Device emits laser, and photoelectric sensor detects one group of reflected light data, and with the average intensity values Sm and weighted sum St=of meansquaredeviationσ
Sm+5 σ controls level Four refrigeration heap work, measures rough dew point Td after light intensity reaches setting target, obtain as setting value
The target temperature Ts that lower secondary control is determined after dew point when obtaining rough dew point after booting for the first time, takes Ts=Td-1, subsequent acquirement essence
After close dew point, target temperature is adjusted to Ts=Td-0.1.Specific step is as follows:
(1) one group of reflected light data is detected after dew point hygrometer booting, light intensity setting value St is found out, then with maximum drive voltage
The refrigeration of level Four refrigeration heap is controlled, and is arranged such as -100 DEG C of an extreme low temperature and is used as target value, accelerates cooling to shorten response
Time measures rough dew point value Td when light intensity reaches St for the first time；
(2) in the subsequent process after obtaining dew-point temperature, dynamic PID parameter is used to be controlled by target of St；According to
The deviation of deviation, temperature value and target temperature between reflected light and setting value calculates one group of dynamic PID parameter to adjust mirror surface
Temperature, and meet from target temperature and setting light intensity it is closer, temperature fluctuation is smaller；When temperature difference is less than 1 or reflective light intensity misses
Difference less than 0.1 after using one group of fixed pid parameter steady reflection light intensity, the critical shape for making mirror surface be in moisture condensation and not condense
State, constantly measurement temperature value；
(3) to, as accurate dew-point temperature, and target temperature being adjusted after measured temperature value sliding average in certain period
For Ts=Td-0.1, new target temperature is continued to use to recycle and measure accurate dew point, to improve the stability of dew point.
Dynamic PID controller algorithm in the step (2) are as follows:
Du=et* [p* (e1-e2)+i*e1+d* (e1-e2*2+e3)]；
In formula, difference of the e1 for light intensity setting value St and real-time light intensity value reallight, e1=St-reallight, e2,
E3 be respectively before reflective light intensity error amount twice, du is output increment, and it is exhausted with temperature target difference that et is real time temperature
To value, et=| temp-Ts |, p, i, d are to meet to adjust desired ratio, integral, differential parameter through adjusting, may be set to 300,
10,1.5.Temperature tuning parameters et=is introduced in pid control algorithm | temp-Ts |, for accelerating light intensity regulating to setting value.
In the dynamic PID controller algorithm, when et is less than 1 or error e 1 is less than 0.1, et is taken as 1, to stablize light intensity
Control.When reflective light intensity is close to setting value, some limitations are carried out to et role.
The utility model uses control reflective light intensity by the improvement to PID control to reach the control method of temperature control, and
Temperature tuning parameters are introduced on the basis of controlling light intensity, effectively accelerates cooling system speed, makes the time of measuring of dew-point temperature
It greatly shortens, shortens the time of dew point generation, improve the response speed of system and the precision of measurement, stability.Meanwhile expanding
The measurement range of big dew point hygrometer, it can be achieved that some ultra-low dew points measurement.
Detailed description of the invention
Fig. 1 is Tthe utility model system block diagram.
Fig. 2 is the utility model hardware structural diagram；In figure, 1- laser, 2- photoelectric sensor, 3- lens, 4- light
Clean mirror surface, 5- temperature sensor, 6- level Four refrigeration heap, 7- radiator.
Fig. 3 is temperature control flow figure when the utility model is used.
Specific embodiment
Specific embodiment of the present utility model is further described in detail with reference to the accompanying drawing, is not specified in embodiment
Technology be the prior art.
Embodiment 1: as shown in Figure 1 and Figure 2, this ultra-low humidity dew point hygrometer includes main control module, refrigeration module, temperature measurement module, light
Learn module.Main control module is connected with other each modules, completes the master control of each module.Main control module is by stm32 microcontroller, power
The composition such as bridge heap, telecommunication circuit, and the control to each module is implemented by conventional programming；Refrigeration module is by level Four semiconductor refrigerating
Piece stacks, and the ultralow temperature angle value needed for it is cooled to as main control module control Cold Mirrors, can apply reversed electricity as needed
Stream is heated to eliminate the dew of condensation drop or frosting；Temperature measurement module is made of high-precision thermometer, Miniature temperature sensing element
PT1000 is embedded into the inside of the metal smoothening mirror surface；Optical module is by invariable power laser, the thermally conductive fast metal reflected
Molybdenum mirror, focal length are the convex lens of 15mm, photoelectric sensor TEPT5600 composition, are placed in a lighttight space, laser
Emit laser to mirror surface, retroreflection light send photoelectric sensor to detect after passing through lens focus, moisture condensation back reflection light enhancing.Light
Clean mirror surface is placed on level Four refrigeration heap, and level Four refrigeration heap is placed on radiator；Bright and clean mirror surface and level Four refrigeration heap and dissipate
Common 7783 heat-conducting silicone grease of SHIN-ETSU HANTOTAI is coated between thermal.
As shown in figure 3, this ultra-low humidity dew point hygrometer is in use, achieve the effect that temperature control by control reflective light intensity, it will be anti-
It penetrates in light intensity input dynamic PID controller, duty ratio is changed according to PID output quantity to control the refrigeration of level Four refrigeration module；By
The laser of optical module emits laser, and photoelectric sensor detects one group of reflected light data, and with average intensity values Sm and square
The weighted sum St=Sm+5 σ of poor σ controls level Four refrigeration heap work, measures after light intensity reaches setting target as setting value
Rough dew point Td obtains the target temperature Ts of determining lower secondary control after dew point, when obtaining rough dew point after booting for the first time, takes Ts=
Td-1, after the accurate dew point of subsequent acquirement, target temperature is adjusted to Ts=Td-0.1.Specific step is as follows:
(1) laser emits laser after dew point hygrometer booting, and photoelectric sensor detects one group of reflected light data, finds out light intensity and set
Definite value St, i.e., using the weighted sum St=Sm+5 σ of average intensity values Sm and meansquaredeviationσ as setting value, then with maximum drive electricity
The refrigeration of voltage-controlled level Four refrigeration heap processed, and be arranged one (- 100 DEG C) of extreme low temperature and be used as target value, accelerate cooling to shorten sound
Between seasonable, when reflective light intensity reaches setting value St, the rough dew point Td of first time measured, Ts=Td-1 is taken；
(2) in obtaining the subsequent process after rough dew-point temperature, dynamic PID parameter is used to be controlled by target of St
System；According to the deviation of deviation, temperature value temp and target temperature Ts between reflected light reallight and setting value St, calculate
One group of dynamic PID parameter adjusts mirror temperature, and meets closer from target temperature and setting light intensity, and temperature fluctuation is smaller；
Dynamic PID controller algorithm are as follows:
Du=et* [p* (e1-e2)+i*e1+d* (e1-e2*2+e3)]；
Difference of the e1 for light intensity setting value St and real-time light intensity value reallight in formula, e1=St-reallight, e2,
E3 is respectively preceding light intensity error amount twice, and du is output increment, and et is the absolute value of real time temperature and temperature target difference,
Et=| temp-Ts |, p, i, d be meet through adjusting adjust desired ratio, integral, differential parameter (be respectively set as 300,10,
1.5)；When et is less than 1 or error e 1 is less than 0.1, et is taken as 1, (is introduced in pid control algorithm with stablizing the control of light intensity
Temperature tuning parameters et=| temp-Ts |, for accelerating light intensity regulating to setting value.When reflective light intensity is close to setting value, to et
Role carries out some limitations)；
After temperature difference is less than 1 or reflective light intensity error is less than 0.1, using one group of fixed pid parameter steady reflection
Light intensity, the critical state for making mirror surface be in moisture condensation and not condense, constantly measurement temperature value；
(3) to accurate dew-point temperature Td is used as after measured temperature value sliding average in 5s, to improve the stability of dew point, and
Target temperature is adjusted to Ts=Td-0.1, continues to use new target temperature to recycle and measure accurate dew point.
Embodiment 2: as shown in Figure 1-3, the step of system structure of this ultra-low humidity dew point hygrometer and its temprature control method
It is same as Example 1.In ultra-low humidity dew point hygrometer, temperature measurement module is made of high-precision thermometer, Miniature temperature sensing element
PT100 is embedded into the inside of the metal smoothening mirror surface；Optical module is by invariable power laser, the thermally conductive fast metal molybdenum reflected
Mirror, focal length are the convex lens of 15mm, photoelectric sensor TEPT5600 composition, are placed in a lighttight space.
Embodiment 3: as shown in Figure 1-3, the step of system structure of this ultra-low humidity dew point hygrometer and its temprature control method
It is same as Example 1.In ultra-low humidity dew point hygrometer, temperature measurement module is made of high-precision thermometer, Miniature temperature sensing element
PT1000 is embedded into the inside of the metal smoothening mirror surface；Optical module is by invariable power laser, the thermally conductive fast metal reflected
Molybdenum mirror, focal length are the convex lens of 15mm, photoelectric sensor silicon photocell 2DU6 composition, are placed in a lighttight space.
It is described above in conjunction with technology contents of the attached drawing to the utility model, but the protection scope of the utility model is not
It is limited to the content, it within the knowledge of one of ordinary skill in the art, can also be not depart from this practical new
The technology contents of the utility model are made a variety of changes under the premise of type objective, it is all the spirit and principles of the utility model it
Any modification, equivalent substitution, improvement and etc. that are interior, being done, should be included within the scope of protection of this utility model.
Claims (2)
1. a kind of ultra-low humidity dew point hygrometer, it is characterised in that: main including main control module, refrigeration module, temperature measurement module, optical module
Control module is connected with other each modules, completes the master control of each module；The main control module includes stm32 microcontroller, power bridge
Heap, telecommunication circuit；The refrigeration module is stacked by level Four semiconductor chilling plate into level Four refrigeration heap, and by the main control module
Control cools to the ultralow temperature angle value needed for it to optical module, can apply reverse current heating as needed to eliminate condensation
Dew drop or frosting；The temperature measurement module is made of high-precision thermometer, and Miniature temperature sensing element is embedded into optical module
The inside of bright and clean mirror surface；The optical module is made of laser, bright and clean mirror surface, lens, photoelectric sensor, be placed in one it is impermeable
In the space of light, laser emits laser to mirror surface, thereafter ties reflected light by sending photoelectric sensor to detect after lens focus
Reveal the enhancing of back reflection light；The bright and clean mirror surface of the optical module is placed on the level Four refrigeration heap of cold module, and level Four refrigeration is stacked
It is placed on radiator.
2. ultra-low humidity dew point hygrometer according to claim 1, it is characterised in that: the bright and clean mirror surface and level Four refrigeration heap and dissipate
Heat-conducting silicone grease is coated between thermal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821488517.XU CN208860779U (en) | 2018-09-12 | 2018-09-12 | A kind of ultra-low humidity dew point hygrometer |
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| CN201821488517.XU CN208860779U (en) | 2018-09-12 | 2018-09-12 | A kind of ultra-low humidity dew point hygrometer |
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| CN201821488517.XU Expired - Fee Related CN208860779U (en) | 2018-09-12 | 2018-09-12 | A kind of ultra-low humidity dew point hygrometer |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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2018
- 2018-09-12 CN CN201821488517.XU patent/CN208860779U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP02 | Change in the address of a patent holder | ||
| CP02 | Change in the address of a patent holder |
Address after: 210044 No. 69 Olympic Street, Jianye District, Nanjing City, Jiangsu Province Patentee after: Nanjing University of Information Science and Technology Address before: 211500 Yuting Square, 59 Wangqiao Road, Liuhe District, Nanjing City, Jiangsu Province Patentee before: Nanjing University of Information Science and Technology |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190514 Termination date: 20210912 |