CN106501313A - Double-mirror double-light-path cold mirror type dew point instrument - Google Patents
Double-mirror double-light-path cold mirror type dew point instrument Download PDFInfo
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- G01N25/66—Investigating or analyzing materials by the use of thermal means by investigating moisture content by investigating dew-point
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Abstract
The invention relates to precision detection of industrial gas water dew point, in particular to a double-mirror double-optical-path cold mirror type dew point instrument, which is used for solving the defects that the traditional cold mirror type dew point instrument has strict requirements on external working conditions such as ambient temperature and the like, has low measurement speed, is heavy and is not easy to carry, and the like. The device adopts two mirror surfaces, two light sources and two photoelectric receiving elements to form two sets of photoelectric measuring systems, and the temperature balance is kept between the temperature balance pressing plate and the measuring cavity, so that the environmental adaptability of the instrument is improved; the special small-sized Stirling refrigerator is used as a cold source, the temperature can be quickly and accurately reduced to be below-100 ℃ without any auxiliary refrigeration, the size and the weight of the whole machine are greatly reduced, and the detection precision is improved by directly using the top surface of the cold end of the refrigerator as a detection mirror surface.
Description
Technical field
The present invention relates to a kind of gas water dew point precise detection device, specifically a kind of based on bimirror face bifocal path structure
Chilled-mirror type dew point instrument.
Technical background
Humidity is a kind of physical quantity for representing moisture in gas.Under identical environment temperature, in equal-volume air
The steam for containing is fewer, and humidity is less；, whereas if the steam for containing is more, then humidity is bigger.Humidity is ceased with the existence of the mankind
Manner of breathing is closed, and at 18 DEG C, the optimum humidity of human body is 30%RH to 40%RH；At 25 DEG C, optimum humidity be 40%RH extremely
50%RH.When humidity humidity range suitable less than human body, easily cause respiratory tract uncomfortable, such as lip is dry, throat swells and ache,
The symptoms such as nasal bleeding；When humidity is higher than human body Suitable ranges, as the evaporation rate of body surface sweat is slack-off, body is made
The metabolism of moisture cannot be normally carried out, the problems such as skin disease, tuberculosis and heatstroke is easily caused.Humidity is for development in science and technology
There is vital impact.In the reliability testing of war products, 40% failure product is to exceed standard model due to humidity
Caused by enclosing；In the exploitation and application of electron trade, 25% electronic product for appearing above failure is caused as humidity is excessive
Caused by element loose contact；In the communications industry, too low ambient humidity can cause electronic equipment to be damaged by static electricity, too high ring
Border humidity can make electronic equipment make moist, and cause communication line to be paralysed.By relative humidity affected larger also include cigarette, weaving,
All conglomeraties such as printing.Therefore, with the development and the raising of living standards of the people of science and technology, accurate humidity observing and controlling is more
It is taken seriously.
The conventional method for expressing of humidity has mixing ratio, water vapor partial pressure, molar fraction, relative humidity, dew-point temperature etc., at present
In industry, more common method for expressing is dew-point temperature, and the instrument for measuring dew-point temperature is referred to as dew point hygrometer.Dew point measurement is easy
Detected relatively difficult by other physical quantitys, the such as impact of environmental pressure, temperature etc..The technology path of dew point hygrometer mainly has Cold Mirrors
Formula dew point hygrometer, electric transducer formula dew point hygrometer, electric Jie's method dew point hygrometer, crystal oscillation formula dew point hygrometer and infrared dew point hygrometer.
The general principle of chilled-mirror type dew point instrument is meeting on gas minute surface at different temperatures using various moisture contents
Condensation, using photoelectric detecting technology, temperature when detecting cut-layer and measuring condensation, directly displays dew point.Minute surface freezes at present
Method have semiconductor refrigerating, liquid nitrogen refrigerating and pressure-air refrigeration.Chilled-mirror type dew point instrument uses direct measuring method, is
Certainty of measurement and a kind of dew point hygrometer of stability highest, can use as standard dew point hygrometer at present.Current full accuracy in the world
Reach ± 0.1 DEG C (dew-point temperature), general precision is can reach within ± 0.5 DEG C.Electric transducer formula dew point hygrometer is mainly using hydrophilic
Property material or hydrophobic material as medium, such as three two rate films of oxidation, after the gas of water content is flowed through, dielectric constant or electricity
There is respective change in conductance, measure capacitance at that time or resistance value, just can know that moisture in gas content at that time.International at present
Upper full accuracy reaches ± 1.0 DEG C, and general precision is can reach within ± 3 DEG C.Electrolysis dew point hygrometer is using materials such as phosphorus pentoxides
Polar molecule is resolved into after material moisture absorption, so as to the characteristic of stored charge on electrode, foundation is designed in absolute moisture content unit
The micro- moisture teller of electrolysis in system.Electric transducer formula dew point hygrometer and electric Jie's method dew point hygrometer relative to chilled-mirror type dew point instrument, small volume,
Small power consumption, but certainty of measurement is low, is susceptible to dew-point temperature drifting problem, and the dew point hygrometer product of the technology is used for dew point change
Change little, the metastable occasion of measurement working medium.The spy that crystal oscillation formula dew point hygrometer is changed using frequency of oscillation after crystal adhesional wetting
Property, crystal oscillation formula dew point hygrometer can be designed, this is a newer technology, very low in the extremely low water content dew point of measurement in theory
（Less than -90 degree）When certainty of measurement high, but cavity oscillation stably takes long enough, and technically has a lot of restrictions.Red
Outer dew point hygrometer is difficult to measure low dew point, and the mainly peak detectivity of Infrared Detectors can't reach the amount of minor amount of water absorption
Level, interference of other component contents to Infrared spectra adsorption also in gas.
Chilled-mirror type dew point instrument, its are measured and are based on photovoltaic principals, and simple chilled-mirror type dew point instrument manually adjusts refrigerating capacity
To control minute surface cooling rate, the generation that reveals is determined with visual method.This dew point hygrometer is largely carried out by experience, people
It is factor than larger.The precise dew-point hygrometer overwhelming majority determines that using electro-optical system the generation of dew, photodetector system are mainly wrapped
The reception system of a stable light source and reflected light is included, is shone from the directional light of light source and be specularly reflected on minute surface, reflected
Light photoelectric tube or light-sensitive element are received.Before minute surface condenses, the luminous flux of incident and reflection is substantially stable, works as mirror
When there is dew on face, reflected light is scattered, and the light quantity that optical receiver system is received reduces, and accurately judges that the appearance of dew point whether may be used
Realized by the change tracking and analysis to receiving light quantity.
In practical application in industry, although chilled-mirror type dew point instrument be industry generally acknowledge most accurate instrument, but its except metering,
The application such as laboratory is outer, and the application amount of other industries is also fewer, is primarily present following Railway Project：
1) monochromatic light road chilled-mirror type dew point instrument is measured using a light-emitting component and receiving element, light-emitting component luminous strong
The optical parametrics such as degree, light color, light beam divergence angle are influenced by environmental temperature, and equally, optical receiver component also receives environment temperature
Degree etc. affects larger, optical parametric variation tendency of the even same optical element under different light intensity regions, different temperatures
All it is not quite similar, the therefore moment such as environment temperature larger change affects larger on dew point measurement precision.
2) existing double light path chilled-mirror type dew point instrument is adjusted using a minute surface, using the method such as spectroscope or the screw that is in the light
The whole luminous flux for making two-way light splitting is equal, two-way optical receiver component receives reflection beam splitting and direct projection point from minute surface respectively
Light, compensates the measure error that variation of ambient temperature etc. causes using direct projection light splitting as reference light, improves dew point hygrometer environment and fits
Ying Xing.But in practical application, the direct projection light splitting of receiving terminal and the luminous intensity of reflection beam splitting are kept by adjusting the screw that is in the light
Secular equilibrium is very difficult, because elastic and its thread spacing abrasion of spectroscopical deviations, the screw that is in the light etc. is small
Change is likely to cause the relatively large deviation of two-way luminous intensity, affects certainty of measurement.
3) chilled-mirror type dew point instrument is not only expensive, and must throttle, partly lead by liquid nitrogen, gases at high pressure for a long time
, used as low-temperature receiver, machine volume is huge, power consumption is higher, unsuitable portable, in-site measurement speed is slow for the cold pump of body or Mixed Refrigerants.
Liquid nitrogen container volume is larger, installs and is limited to, and measurement process liquid nitrogen is consumed soon, and refrigerating speed is difficult to control to, and affects dew point hygrometer inspection
Precision is surveyed, and liquid nitrogen is difficult to obtain in remote industrial occasions；Gases at high pressure throttling refrigeration device volume is big, consumption of air source is fast；
When semiconductor cooling pump cooling characteristic determines its profound hypothermia, power consumption is big, radiator portion especially auxiliary cooling equipment volume big and
Weight；Mixed working fluid refrigerating plant there is also big volume, weight, the low problem of refrigerating efficiency.
The problem of above-mentioned several aspects, causes the technical performance and range of application of chilled-mirror type dew point instrument to be very limited,
Industry spot is not suitable for for the requirement of the quick measurement of humidity, be unfavorable for promoting.The domestic chilled-mirror type of existing main flow on market
Dew point hygrometer is only applicable to the measurement of more than -60 DEG C water dew points, and has more harsh requirement to ambient parameters such as temperature；Import
Mostly using semiconductor cooling pump as low-temperature receiver, its technical characteristic requires that warm area increase is extra below -60 DEG C to chilled-mirror type dew point instrument
Auxiliary cooling equipment, machine volume are huge, not easily shifted, can only be used to the test such as measuring station, laboratory, are not suitable for industry existing
For the requirement of the quick measurement of humidity, test is patrolled and examined at particularly many scenes for field.
Generally speaking, the use of dew point hygrometer obtains very fast development with the growth of industrial requirement, 2000 it
Before, chilled-mirror type dew point instrument occupies absolute corner on the market, and its manufacturer mainly includes U.S. GE, Britain meter Xie Er and Switzerland
MBW tri-, but the price of chilled-mirror type dew point instrument and technical characteristic（Volume is big, optics is complicated, environmental suitability is poor, using not
Convenient）Limit its extensive application industrially.After 2000, sensor type dew point hygrometer is obtained because small volume is easy to use
To developing rapidly, the market in the whole world 99% with meter Xie Er and Vailsla OY as representative, is occupied.After 2010, sensor type
Dew point hygrometer can not be received by industry, in electric power, petrochemical industry, high-end gas, semiconductor, lithium battery and nuclear power industry, pass
Sensor formula dew point hygrometer is progressively substituted by chilled-mirror type, and for dew point accuracy of detection and the needs of stability, industry has to select to hold high
Expensive chilled-mirror type dew point instrument, the product for abandoning sensor type.Therefore, from the point of view of industry development trend, a possess high accuracy, height
Stability, small volume, easy to operate new chilled-mirror type dew point instrument, are the products for best suiting the market demand at present.
Content of the invention
The purpose of the present invention is to overcome that above-mentioned traditional chilled-mirror type dew point instrument photosignal is influenced by environmental temperature, dew point
The whole machine heaviness of instrument is difficult portable etc. not enough, it is proposed that a kind of chilled-mirror type dew point instrument of the bifocal path structure based on bimirror face.
Technical scheme proposed by the present invention is as follows：
A kind of bimirror face double light path chilled-mirror type dew point instrument, based on photoelectric detecting technology, using two minute surfaces, two-way light source and
Two-way photoelectric apparatus constitute two sets of photoeletric measuring systems, are fixedly mounted on same measurement cavity, and flat by temperature
Weighing apparatus pressing plate and measurement cavity keeping temperature balance.The reference that a set of photoeletric measuring system forms a closing with measurement cavity is empty
Chamber, minute surface are placed in reference in cavity, and the dew-point temperature of empty intracavity gas is constant, and the measuring system is referred to as referring to photoelectric measurement system
System；Another set of photoeletric measuring system forms the measurement cavity of another sealing with measurement cavity, and minute surface is placed in measurement cavity,
And set up thermally coupled with low-temperature receiver, and less than -100 DEG C can be cooled to, tested gas is entered by the inlet channel measured on cavity
Measurement cavity, leaves measurement cavity through outlet passageway after above minute surface, and the measuring system is referred to as key light electrical measuring systems.
The basic functional principle of photoeletric measuring system is that the light that light source is launched is after mirror-reflection by photoelectric apparatus
Reception is changed into voltage signal, if minute surface is cleaning no-sundries, full transmitting occurs on minute surface.With reference to photoeletric measuring system
In, the temperature remains within the normal range for minute surface, is not lowered the temperature by any cooling device, so occurred on minute surface in this road photodetector system is forever
Total reflection.Key light electricity detecting system, minute surface therein are cooled by low-temperature receiver, while tested gas is flowed through above minute surface, work as mirror
When face temperature reaches the dew-point temperature of tested gas, the moisture in tested gas will remain in minute surface in the form of water or frost
On, the total reflection on minute surface is changed into unrestrained transmitting, and now in the road measuring system, the voltage signal of receiving element occurs acute variation,
The temperature for locking now minute surface is the dew-point temperature of tested gas.
In measurement process, two sets of photodetector systems all can be disturbed by environment temperature and external clutter, to identification
There is Light intensity in dew point（Voltage）The change of signal brings interference.The present invention is designed with two using bimirror face bifocal path structure
Set photodetector system, this two sets of systems are all fixed on same measurement cavity, and therefore circuit isolation and temperature isolation are basic
Equally, the interference outside receiving is also essentially the same, and by the use of in two sets of photodetector systems, the voltage difference of receiving element is used as dew point
The detection signal of generation, can effectively reduce the error that external environment condition causes to measurement, while improving certainty of measurement, improve instrument
Device adapts to the ability of environment, meets the use requirement of different occasions.Meanwhile, the use of bimirror face bifocal path structure, it is to avoid list
The use of spectroscope and the devices such as screw that are in the light in mirror surface structure, it is to avoid spectroscope locating bias, screw Long-Time Service loosen, spiral shell
The measure error that the minor variations such as tooth spacing Long-Time Service abrasion may cause.
Minute surface cooling in key light electrical measuring systems, with Miniature Stirling cryocooler as the low-temperature receiver of detection Cold Mirrors, low in energy consumption,
Without the need for any auxiliary cooling can fast cooling to less than -100 DEG C, measurement range to -90 DEG C, release liquid nitrogen, the weight of gases at high pressure
Buy again, fill.Dew point hygrometer machine volume is little, lightweight, be easy to carry, operate directly perceived, measurement quick and environmental suitability
Good, it is adaptable to which that different moisture levels measurement occasion, especially measuring speed have high demands, the measurement occasion of environment difference.
Description of the drawings
Fig. 1 is the structural representation of the present invention, and Fig. 2, Fig. 3, Fig. 5 are respectively A, B, C local detail profile of Fig. 1, Fig. 4
Exploded view for B part sectioned views.
Explanation in figure：1. observation window, 2. peephole, 3. equalized temperature pressing plate one, 4. light path radiated element one, 5. light path send out
Passage one is penetrated, 6. inlet channel, 7. detect Cold Mirrors cushion block, 8.PT100,9. stay-warm case, 10. heat-insulating material, 11. measurement cavitys,
12. detection Cold Mirrors, 13. measurement cavitys, 14. light path receiving channels one, 15. light path receiving elements one, 16. equalized temperature pressing plates
Two, 17. light path radiated elements two, 18. light path transmission channels two, 19. reference mirrors, 20. reference mirror cushion blocks, 21. with reference to empty
Chamber, 22. light path receiving channels two, 23. light path receiving elements two, 24. outlet passageways, 25. low-temperature receivers（Sterlin refrigerator）, 26.
Control system（Comprising software and hardwares such as circuit board, single-chip microcomputer, A/D chip, dew point algorithms）.
Specific embodiment
The chilled-mirror type dew point instrument of a kind of pair of Cold Mirrors bifocal path structure includes measuring cavity 11, detection Cold Mirrors cushion block 7 and reference
Minute surface cushion block 20 etc., detection Cold Mirrors cushion block 7 is on detection Cold Mirrors 12（Low-temperature receiver top）, and with measurement cavity 11 between formed
Measurement cavity 13, detection Cold Mirrors 12 are located in measurement cavity 13, equipped with PT100 8 in the middle part of detection Cold Mirrors 12, can be measured in real time cold
Mirror temperature；Reference mirror 19 is installed on reference mirror cushion block 20 and is formed with reference to cavity 21, reference between measurement cavity 11
Minute surface 19 is sealed in reference in cavity 21.Two groups of corresponding minute surfaces are identical with optical element specification difference.
Light path radiated element 1 and light path radiated element 2 17 are installed in 11 length direction both sides of measurement cavity, side, thereon
Covered with equalized temperature pressing plate 1；Opposite side installs light path receiving element 1 and light path receiving element 2 23, uses temperature thereon
Balance pressing plate 2 16 is covered.Two equalized temperature pressing plates are brought into close contact with 11 surface of measurement cavity, and excellent using heat conductivility
Different material so that optical element is identical with measurement 11 bulk temperature of cavity.Between light path radiated element 1 and detection Cold Mirrors 12
Light path transmitting optical channel 1 is provided with, and light path is provided between light path receiving element 1 and detection Cold Mirrors 12 and is received optical channel 1.
Measurement cavity 11 is provided with inlet channel 6 and outlet passageway 24, communicates with measurement cavity 13, and tested gas can be by inlet channel 6
Detection Cold Mirrors 12 is skimmed over, is discharged from outlet passageway 24.Observation window 1, observation window 1 and detection Cold Mirrors 12 is provided with above measurement cavity 11
Between be provided with peephole 2, can observe detection Cold Mirrors 12 and when needed open observation window 1 cleaning detection Cold Mirrors 12.Light path is sent out
Penetrate and between element 2 17 and reference mirror 19, be provided with light path transmitting optical channel 2 18, light path receiving element 2 23 and reference mirror 19
Between be provided with light path receive optical channel 2 22.Measurement cavity 13 is adjacent but separate with reference to 21 position of cavity, measures cavity
13 form annular seal space in the case of inlet channel 6 and outlet passageway 24 are blocked, with reference to cavity 21 from as annular seal space.Above-mentioned two-way
Light path radiated element distinguishes two minute surfaces of directive, and two-way optical receiver component receives the reflected light for carrying out two minute surfaces, two-way respectively
The luminous intensity of reflected light is adjusted by the circuit of control system 26.
Above-mentioned pair of Cold Mirrors double light path dew point hygrometer adopts Miniature Stirling cryocooler 25 for low-temperature receiver, outside sterlin refrigerator cold end
Stay-warm case 9 is installed in side, is filled with heat-insulating material 10 inside stay-warm case, and measurement 11 integral installation of cavity is on stay-warm case 9.Above-mentioned double
Cold Mirrors double light path dew point hygrometer by control system 26, the tested gas dewpoint of automatic duplicate measurements.
Source of the gas is connected, tested gas skims over detection Cold Mirrors 12, flows out from outlet passageway 24.Start sterlin refrigerator 25 pairs
The 12 continuous uniform cooling of detection Cold Mirrors, as temperature constantly reduces, in measurement cavity 13, in gas, water saturation vapour pressure is continuous
Reduce, until moisture content reaches saturation in gas, dew or frost occurs in 12 surface of detection Cold Mirrors, now system detectio to temperature be exactly
The dew-point temperature of gas.Above-mentioned two equalized temperature pressing plate make respectively two-way light path radiated element, two-way optical receiver component with
11 overall keeping temperature balance of measurement cavity, when environment temperature changes, the variable quantity of two-way luminous intensity is also essentially identical, is therefore
System can accurately judge the luminous intensity mutation that dew point or frost point cause, specific as follows shown：
Optical path receiving intensity U1=initial luminescence U01+
Intensity variation Ut1+ that temperature change causes
Intensity variation Uj1 that detection cold mirror reflection causes+
Intensity variation Us that frosting or dew cause
Reference path receiving intensity U2=initial luminescence U02+
Intensity variation Ut2 that temperature change causes+
Intensity variation Uj2 that reference mirror reflection causes
∵
1) two light path radiated element specifications are identical, and its initial luminescence is essentially identical, i.e. U02=U01
2) two minute surface specifications are identical, then light intensity identical, the i.e. Uj2=Uj1 of change that two minute surfaces cause
3) two light path radiated elements and two light path receiving elements and measurement cavity temperature whole machine balancing, the then light that temperature causes
Strong all identical in transmitting and the change of receiving terminal, i.e. Ut2=Ut1
∴U1 – U2= （U01 + Ut 1+ Uj1 +Us）-（U02 + Ut2 + Uj 2） =Us
In theory, when detection Cold Mirrors does not condense or be white, the initial value of Us is constant, and when therefore dew or frost occur, the value becomes rapidly
Change, therefore system can accurately judge that dew point or frost point occur and lock Current Temperatures i.e. dew-point temperature.
It is an advantage of the current invention that：
1) two sets of photoeletric measuring systems are adopted, often the minute surface of set system, electronic device and optics all same, its light in structure
The initial balance of intensity is adjusted by adjusting circuit realiration, it is to avoid using spectroscope and the structures such as screw that are in the light, so as to avoid
The minor variations such as spectroscope locating bias, the screw Long-Time Service that is in the light loosening or the abrasion of thread spacing Long-Time Service may cause
Measure error, the long-time stability of double light path photosignal are improved, and dew point hygrometer long-term reliability increases；
2), in structure, light path radiated element and light path receiving element in two sets of photoeletric measuring systems are symmetrically mounted on measurement cavity
Length direction both sides, respectively with the equalized temperature pressing plate capping that heat conductivility is excellent, balance pressing plate is tight with measurement housing surface
Laminating, when therefore environment temperature changes, the variation of light intensity caused by temperature is also essentially identical, and reference path can be used as base
The intensity variation of quasi- offset measurement light path, system can accurately judge the luminous intensity mutation that dew point or frost point cause, measurement
Precision is significantly increased；
3), with special sterlin refrigerator as low-temperature receiver, the cold end top surface of refrigeration machine is directly as detection for dew point hygrometer proposed by the present invention
Minute surface, it is to avoid the heat transfer between cold end and minute surface postpones the error for causing, without the need for any auxiliary cooling, refrigeration machine can be quickly smart
Standard is freezed to less than -100 DEG C, and measurement range is extended to -90 DEG C, and accuracy of detection reaches ± 0.1 DEG C, and technical indicator reaches the world
Leading, domestic initiation.Equipment power dissipation, volume and weight significantly reduce simultaneously, 50 watts or so of whole acc power, and the whole machine of equipment only has
Several kilograms, it is easy to carry, the dew point hygrometer was about 3 minutes -60 DEG C of warm area dew point single measurement times, with traditional balancing method phase
50% is reduced than measure the cycle, it is adaptable to different moisture levels measurement, the measurement occasion that especially environment is poor, measuring speed is to be sought quickness.
Claims (4)
1. a kind of bimirror face double light path chilled-mirror type dew point instrument, based on photoelectric detecting technology, including 1. observation windows, 2. observes
Mirror, 3. equalized temperature pressing plate one, 4. light path radiated element one, 5. light path transmission channel one, 6. inlet channel, 7. detects Cold Mirrors pad
Block, 8.PT100,9. stay-warm case, 10. heat-insulating material, 11. measurement cavitys, 12. detection Cold Mirrors, 13. measurement cavitys, 14. light paths connect
Passage one is received, 15. light path receiving elements one, 16. equalized temperature pressing plates two, 17. light path radiated elements two, the transmitting of 18. light paths are logical
Road two, 19. reference mirrors, 20. reference mirror cushion blocks, 21. refer to cavity, 22. light path receiving channels two, and 23. light paths receive unit
Part two, 24. outlet passageways, 25. low-temperature receivers（Sterlin refrigerator）, 26. control systems（Comprising circuit board, single-chip microcomputer, A/D chip,
The software and hardwares such as dew point algorithm）, it is characterised in that：Two sets are constituted using two minute surfaces, two-way light source and two-way photoelectric apparatus
Photoeletric measuring system, a set of photoeletric measuring system form the reference cavity of a closing with measurement cavity, and minute surface is empty as reference
In chamber, the dew-point temperature of empty intracavity gas is constant, and the measuring system is referred to as referring to photoeletric measuring system；Another set of photoelectric measurement system
System forms the measurement cavity of another sealing with measurement cavity, and minute surface is placed in measurement cavity, and and low-temperature receiver（Stirling refrigeration
Machine）Set up thermally coupled；Tested gas can skim over detection Cold Mirrors by inlet channel, discharge from outlet passageway, and opening low-temperature receiver can be to inspection
Survey Cold Mirrors continued down, the tested gas dewpoint of automatic detection and show in real time.
2. the chilled-mirror type dew point instrument of a kind of pair of Cold Mirrors bifocal path structure according to claim 1, it is characterised in that：Two sets of light
The initial balance of electrical measuring systems two-way luminous intensity passes through to adjust circuit realiration, without spectroscope and the structures such as screw that are in the light.
3. the chilled-mirror type dew point instrument of a kind of pair of Cold Mirrors bifocal path structure according to claim 1, it is characterised in that：Two light
Road radiated element and two light path receiving elements are on measurement cavity, and the equalized temperature pressure for using heat conductivility excellent respectively
Plate is covered, and equalized temperature pressing plate is brought into close contact with measurement housing surface, two-way optical element and the overall keeping temperature of measurement cavity
Balance.
4. the chilled-mirror type dew point instrument of a kind of pair of Cold Mirrors bifocal path structure according to claim 1, it is characterised in that：Low-temperature receiver is adopted
With Miniature Stirling cryocooler, and directly with its cold end top surface as detecting minute surface.
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| CN201610889712.2A CN106501313A (en) | 2016-10-12 | 2016-10-12 | Double-mirror double-light-path cold mirror type dew point instrument |
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| CN201610889712.2A CN106501313A (en) | 2016-10-12 | 2016-10-12 | Double-mirror double-light-path cold mirror type dew point instrument |
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| CN106501313A true CN106501313A (en) | 2017-03-15 |
Family
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| CN201610889712.2A Pending CN106501313A (en) | 2016-10-12 | 2016-10-12 | Double-mirror double-light-path cold mirror type dew point instrument |
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| CN107153081A (en) * | 2017-03-24 | 2017-09-12 | 北京航空航天大学 | One kind is based on twin-channel dew point measurement device |
| CN107255653A (en) * | 2017-03-24 | 2017-10-17 | 北京航空航天大学 | One kind is based on twin-channel dew-point measuring method |
| CN109813866A (en) * | 2019-01-24 | 2019-05-28 | 中南大学 | The measuring system and measurement method of unsaturation frozen soil matric potential |
| CN110186955A (en) * | 2019-06-20 | 2019-08-30 | 张帆 | A kind of double light path chilled-mirror type dew point instrument |
| CN110410987A (en) * | 2018-04-27 | 2019-11-05 | 红塔烟草(集团)有限责任公司 | Air-conditioning system chilled water energy-saving control method |
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| CN110186955A (en) * | 2019-06-20 | 2019-08-30 | 张帆 | A kind of double light path chilled-mirror type dew point instrument |
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| CN110596189A (en) * | 2019-09-10 | 2019-12-20 | 深圳国技仪器有限公司 | Humidity detection method and device under high-temperature, high-humidity, high-dust and high-corrosion environment |
| CN111127843A (en) * | 2019-11-11 | 2020-05-08 | 无锡锐科光纤激光技术有限责任公司 | Non-contact type dewing alarm method and device for water-cooled laser |
| CN111044567A (en) * | 2019-12-31 | 2020-04-21 | 中国人民解放军63837部队 | Chilled-mirror dew point hygrometer capable of quickly measuring extremely low dew point |
| CN111812154A (en) * | 2020-06-15 | 2020-10-23 | 王艳萍 | Automatic photoelectric detection system of cold mirror type dew point instrument |
| CN112394086A (en) * | 2020-12-07 | 2021-02-23 | 广州奥松电子有限公司 | Dewing system and dew point instrument thereof |
| CN112666218A (en) * | 2021-01-15 | 2021-04-16 | 山东大学 | Dew point hygrometer for laboratory teaching |
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Application publication date: 20170315 |