CN102565001A - Radiation system for photoelectric hygrometer - Google Patents
Radiation system for photoelectric hygrometer Download PDFInfo
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- CN102565001A CN102565001A CN201010619325XA CN201010619325A CN102565001A CN 102565001 A CN102565001 A CN 102565001A CN 201010619325X A CN201010619325X A CN 201010619325XA CN 201010619325 A CN201010619325 A CN 201010619325A CN 102565001 A CN102565001 A CN 102565001A
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- heating radiator
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- 230000005855 radiation Effects 0.000 title abstract 3
- 238000013461 design Methods 0.000 claims abstract description 16
- 238000012360 testing method Methods 0.000 claims abstract description 15
- 230000003287 optical effect Effects 0.000 claims abstract description 9
- 238000005057 refrigeration Methods 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 9
- 230000017525 heat dissipation Effects 0.000 claims description 7
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 claims description 6
- 239000000523 sample Substances 0.000 claims description 6
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical group [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 5
- 238000011161 development Methods 0.000 claims description 4
- 238000000605 extraction Methods 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims description 3
- 229910052697 platinum Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 238000005498 polishing Methods 0.000 claims description 2
- 230000015572 biosynthetic process Effects 0.000 description 4
- 238000005755 formation reaction Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
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Abstract
The invention relates to the design of a novel portable radiation system for a photoelectric hygrometer, which belongs to the field of design of photoelectric test instruments. The novel portable radiation system comprises a sensor part and a machine case part. The sensor part is composed of an optical system (emission, reflection and receiving of light), a refrigeration and fan system and temperature measuring system. The system is small in size and convenient to carry, adopts an air collecting system with two fans, and greatly improves test precision.
Description
Technical field
The present invention relates to a kind of design of novel portable photoelectric dew-point hygrometer cooling system, belong to photoelectricity test instruments design field.
Background technology
Relative humidity is to be illustrated under certain temperature, the pressure; Whether (temperature of water vapor is identical with air themperature all the time near a saturated physical quantity for the water vapor that contains in the air; And water vapor pressure is the dividing potential drop of air pressure); Relative humidity is big more, explains that airborne water vapor is more approaching saturated, when in a single day airborne water vapor be state of saturation (this moment water vapor claim Saturated water vapor pressure again) and when condensing into water; Just be referred to as to call dewfall, temperature at this moment is called dewpoint temperature (or being called for short dew point).Dewpoint temperature just is used for representing the humidity of gas.Theoretical and actual showing, the dewpoint temperature of air and Saturated water vapor pressure are one to one.Under certain temperature; Airborne water vapor pressure generally all will be lower than the Saturated water vapor pressure under this temperature, under the constant situation of pressure air is lowered the temperature keeping; Corresponding Saturated water vapor pressure will inevitably reduce in the air so; In case Saturated water vapor pressure drops to when identical with original airborne water vapor pressure, the airborne water vapor that is in temperature-fall period must reach capacity at this moment state and dewfall, this dewpoint temperature can be measured.In theory; For the air of giving fixed temperature, pressure, its relative humidity is corresponding each other with dewpoint temperature, therefore; As long as keeping finding dewpoint temperature under the constant situation of pressure; Through converting or tabling look-up, just can confirm relative humidity, Here it is comes the principle of Humidity Measuring with dew point method.
Aspect accurate humidity measuring, dew point method is a kind of method quite accurately. the measurement that realizes dew point must comprise 3 basic links: cooling, the formation of judging dew point and measurement dewpoint temperature.The accurate dew point hygrometer of existing general portable photo-electric is because volume is too small, and the vibrations of air collection fan are big, and the cooling system radiating efficiency is low, and fan system designs not science, and measuring accuracy is had a negative impact.
Summary of the invention
Characteristics such as for addressing the above problem, the present invention has prepared portable optical dew point detector, has possessed novel supplying gas and cooling system, has the precision height, and volume is little, and noise is low, and instrumentation is easy to use can be used as common working measuring instrument and promote the use of.
The principle of work of dew point hygrometer is: get into integral structure (emission, reflection, reception, thermometric and refrigeration device by light are formed) after the air flue of special collection air (place a thermometric device in the air flue, at the afterbody of air flue a mini-fan is installed) makes sample gas pass through air flue.Measure a kind temperature degree by temperature probe; Refrigerator makes reflection of light face and temperature measurement module lower the temperature together; Catoptrical signal changes and reference voltage relatively produces an error signal; This error signal goes to drive refrigerator work through the PID circuit, makes to remain dewfall state (aqueous vapor that at this moment aqueous vapor of dewfall and the room temperature appearance band of gas are walked on the minute surface balances each other) on the minute surface, and mirror temperature at this moment is exactly a dewpoint temperature.In this state, when the water capacity of appearance gas changed, dew point was also followed the tracks of thereupon and is changed.
The concrete technical scheme of photoelectric dew-point hygrometer of the present invention is following: be divided into Sensor section and cabinet part two parts, middle through electric cable connection, the PID circuit is arranged in the cabinet with other auxiliary circuits.Sensor section is made up of optical system, refrigeration and fan system, temp measuring system.Air flue with special collection air; Place the air intake duct sensor and first plenum fan in the air flue, second extraction fan is installed, make sampling gas through getting into the test chamber body behind the air flue at the afterbody of air flue; Measure a kind temperature degree by temperature probe, refrigerator makes catoptron/temperature measurement module lower the temperature.Catoptrical signal changes and reference voltage relatively produces an error signal; This error signal goes to drive refrigerator work through the PID circuit; Make and remain the dewfall state on the minute surface; The aqueous vapor of dewfall and the aqueous vapor that the room temperature appearance band of gas is walked balance each other on the minute surface at this moment, and the mirror temperature of this moment is exactly a dewpoint temperature.When the water capacity of appearance gas changed, dew point was also followed the tracks of thereupon and is changed.The optical system for testing system comprises emission and reflection of light, the reception of light, adopts LED light emitting diode and photodiode, the mirror surface of catoptron/temperature measurement module; Adopt the platinized platinum of polishing, with a reference diode be contained in luminotron near, the signal of reference photodiode amplifies the back and compares with a reference voltage; The light intensity variation that various factors is caused compensates, and refrigerator has adopted photoelectric isolation technology, and working current can preestablish; When temperature is reduced near the dew point when refrigerator is worked; Working current is by the output control of PID circuit, and the refrigeration electric current can be regulated automatically, and cold junction is followed the tracks of in dewpoint temperature all the time.The present invention adopts small-sized 16 bit single-chip systems of single-chip microcomputer series 80C196 chip development, can be converted into relative humidity unit to dewpoint temperature and appearance temperature degree.Said photoelectric dew-point hygrometer also comprises the loam cake that can screw off, and cooling system comprises main radiator fan, and intended diameter can be 12-20cm, and design speed can be 800-3000 rev/min.Said photoelectric dew-point hygrometer also comprises the bottom base heating radiator, and the section middle part of bottom base heating radiator is a water conservancy diversion wind awl, heat dissipation wind channel of the common formation of said bottom base heating radiator and top base heating radiator.
Aforesaid photoelectric dew-point hygrometer, wherein bottom base heating radiator and top base heating radiator are common constitutes a heat dissipation wind channel and is the fine copper structure.
Optical system is a very important part in the dew point hygrometer sensor, comprises emission and reflection of light, the reception of light.Adopt LED light emitting diode and photodiode in the design, the monochromaticity of light is good, and power consumption is little, drives simply, and stable performance can not produce tangible thermal effect on catoptron.The reflection of light minute surface adopts the platinized platinum that polishes, and its stable performance is corrosion-resistant.Catoptrical light intensity changes whether dewfall of reflection mirror surface, is invariable ideal situation so require light source.In design of Optical System, with a reference diode be contained in luminotron near, the signal of reference photodiode amplifies back and a reference voltage relatively, the light intensity that various factors is caused changes and compensates.
Consider that the electric current that drives semiconductor cooler is bigger, when design, adopted photoelectric isolation technology.The refrigerator working current can preestablish, and when temperature was reduced near the dew point when refrigerator is worked, working current was by the output control of PID circuit, and the refrigeration electric current can be regulated automatically, and cold junction is followed the tracks of in dewpoint temperature all the time.
The degree of accuracy that dew point hygrometer is measured finally depends on thermometric precision.In design, adopted semiconductor thermometric device AD590, temperature-measuring range :-55～150 ℃, precision: ± 0.5 ℃, the linearity: ± 0.5 ℃, and volume is little, Heat stability is good, and output current signal, antijamming capability is strong.It is embedded in the fine copper pedestal of refrigeration end, and catoptron directly is posted on the AD590 top, has reduced thermograde to the full extent.
Dewpoint temperature is a kind of representation of humidity, usually the method for conversion through tabling look-up between dewpoint temperature and the relative humidity.The design utilizes small-sized 16 bit single-chip systems of single-chip microcomputer series 80C196 chip development, can be converted into relative humidity unit to dewpoint temperature and appearance temperature degree.80C196 is a kind of 16 single-chip microcomputer, has 16 internal bus and 16 external bus, and being highly suitable for both needs volume little, again the applications of low price.80C196 has the high speed input channel, only needs 22Ls (during the 12MHz crystal oscillator) switching time, with the 80C196 chip development small-sized SCM system, worked out corresponding converse routine.The dew point testing result can directly demonstrate rh value through showing to switch, and the value of finding with (psychrometric table) compares, and trueness error is no more than 0.5%.
Description of drawings
Fig. 1 is a photoelectric dew-point hygrometer composition frame chart of the present invention;
Fig. 2 is the structural drawing of photoelectric dew-point hygrometer Sensor section of the present invention.
Embodiment
As shown in Figure 1, the composition frame chart of photoelectric dew-point hygrometer of the present invention is divided into cabinet part 1 and Sensor section 2 two parts, and middle through electric cable connection, port can adopt aviation plug.PID circuit of the present invention and other auxiliary circuits are set in the cabinet part 1.
As shown in Figure 2 is the structural drawing of the Sensor section of photoelectric dew-point hygrometer of the present invention; The test air is sent in the test cavity 14 through first plenum fan 3; In the test cavity 14 is optical system for testing system 4, and test air is later discharged the test cavity through second extraction fan 7, and the advantage that adopts two fans is that the rotating speed of each fan needn't design too highly; Therefore the noise that produces is also just smaller with vibration, and then improves measuring accuracy.5 is the air intake duct temperature probe, and 8 is catoptron/temperature measurement module, and 9 is refrigerator; 10 is the top base heating radiator, and 6 is the loam cake that can screw off, and 11 is main radiator fan; Intended diameter can be 12-20cm, and design speed can be 800-3000 rev/min, and 13 is the bottom base heating radiator; The section middle part of bottom base heating radiator 13 is a water conservancy diversion wind awl, said bottom base heating radiator 13 and heat dissipation wind channels 12 of top base heating radiator 10 common formations (firm for test, this pedestal heating radiator can be the fine copper manufacturing).
The invention has the advantages that, adopt the collection air system of double fan, make the rotating speed of each fan needn't design De Genggao, the noise that therefore produces is also just smaller with vibration, and then improves measuring accuracy.Main radiator fan is designed to middle and slow speed of revolution; Diameter can be 12-20cm; Design speed can be 800-3000 rev/min, and the section middle part of bottom base heating radiator 13 is a water conservancy diversion wind awl, with heat dissipation wind channel 12 of top base heating radiator 10 common formations; Said heat dissipation wind channel 12 is the fine copper manufacturing, constitutes the integrated cooling system of efficient stable.
Claims (2)
1. a photoelectric dew-point hygrometer is divided into Sensor section (2) and cabinet part (1) two parts, and is middle through electric cable connection; The PID circuit is arranged in the cabinet with other auxiliary circuits, and Sensor section (2) is made up of optical system (4), refrigeration and fan system, temp measuring system, the air flue of special collection air; Place air intake duct temperature probe (5) and first plenum fan (3) in the air flue, second extraction fan (7) is installed, make kind gas through getting into test chamber body (14) behind the air flue at the afterbody of air flue; Measure a kind temperature degree by air intake duct temperature probe (5), refrigerator (9) makes catoptron/temperature measurement module (8) cooling, catoptrical signal change with reference voltage and relatively produces an error signal; This error signal goes to drive refrigerator work through the PID circuit, makes to remain the dewfall state on the minute surface, and the aqueous vapor of dewfall and the aqueous vapor that the room temperature appearance band of gas is walked balance each other on this moment minute surface; The mirror temperature of this moment is exactly a dewpoint temperature, and when the water capacity of appearance gas changed, dew point was also followed the tracks of thereupon and changed; Optical system for testing system (4) comprises emission and reflection of light, the reception of light, adopts LED light emitting diode and photodiode, the mirror surface of catoptron/temperature measurement module (8); Adopt the platinized platinum of polishing, with a reference diode be contained in luminotron near, the signal of reference photodiode amplifies the back and compares with a reference voltage; The light intensity variation that various factors is caused compensates, and said refrigerator (9) adopts photoelectric isolation technology, and working current can preestablish; When temperature is reduced near the dew point when refrigerator is worked; Working current is by the output control of PID circuit, and the refrigeration electric current can be regulated automatically, and cold junction is followed the tracks of in dewpoint temperature all the time; Utilize small-sized 16 bit single-chip systems of single-chip microcomputer series 80C196 chip development; Be converted into relative humidity unit to dewpoint temperature and appearance temperature degree, said photoelectric dew-point hygrometer also comprises the loam cake (6) that can screw off, and cooling system comprises main radiator fan (11); The intended diameter scope is 12-20cm; The design speed scope is 800-3000 rev/min, and said photoelectric dew-point hygrometer comprises that also the section middle part of bottom base heating radiator (13) is a water conservancy diversion wind awl, and said bottom base heating radiator (13) constitutes a heat dissipation wind channel (12) jointly with top base heating radiator (10).
2. photoelectric dew-point hygrometer as claimed in claim 1 is characterized in that said bottom base heating radiator (13) and top base heating radiator (10) constitute a heat dissipation wind channel (12) jointly and be the fine copper structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010619325XA CN102565001A (en) | 2010-12-30 | 2010-12-30 | Radiation system for photoelectric hygrometer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201010619325XA CN102565001A (en) | 2010-12-30 | 2010-12-30 | Radiation system for photoelectric hygrometer |
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| Publication Number | Publication Date |
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| CN102565001A true CN102565001A (en) | 2012-07-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201010619325XA Pending CN102565001A (en) | 2010-12-30 | 2010-12-30 | Radiation system for photoelectric hygrometer |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178039A (en) * | 2017-01-13 | 2019-08-27 | 赫普塔冈微光有限公司 | The method of equipment and the operation equipment for testing photoelectronic device |
| CN112738429A (en) * | 2020-03-20 | 2021-04-30 | 神盾股份有限公司 | image sensing device |
| CN113029967A (en) * | 2021-03-25 | 2021-06-25 | 广东工业大学 | Device and method for measuring air humidity |
| CN115608122A (en) * | 2022-11-22 | 2023-01-17 | 杭州嘉隆气体设备有限公司 | Compressed air decarburization drying device and control method |
-
2010
- 2010-12-30 CN CN201010619325XA patent/CN102565001A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110178039A (en) * | 2017-01-13 | 2019-08-27 | 赫普塔冈微光有限公司 | The method of equipment and the operation equipment for testing photoelectronic device |
| CN110178039B (en) * | 2017-01-13 | 2021-10-26 | 赫普塔冈微光有限公司 | Apparatus for testing optoelectronic devices and method of operating the same |
| CN112738429A (en) * | 2020-03-20 | 2021-04-30 | 神盾股份有限公司 | image sensing device |
| CN113029967A (en) * | 2021-03-25 | 2021-06-25 | 广东工业大学 | Device and method for measuring air humidity |
| CN115608122A (en) * | 2022-11-22 | 2023-01-17 | 杭州嘉隆气体设备有限公司 | Compressed air decarburization drying device and control method |
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Application publication date: 20120711 |