CN105738318A - Environment humidity monitoring method and system for cultural relic preservation - Google Patents
Environment humidity monitoring method and system for cultural relic preservation Download PDFInfo
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- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers
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Abstract
The invention discloses an environment humidity monitoring method and system for cultural relic preservation. Humidity measurement of an optical fiber gas humidity sensor is divided into measurement conducted on multiple wave lengths changing with the humidity. The environment humidity monitoring method comprises the steps that the optical fiber gas humidity sensor firstly conducts linear calibration on the multiple corresponding wave lengths respectively before monitoring is started, and different wave lengths of the optical fiber gas humidity sensor are automatically switched with environment temperature change during monitoring for humidity measurement. A double-wavelength monitoring mode is provided, the wave lengths with weak absorption peaks are switched in a high-humidity mode, double-wavelength coefficients are calibrated in a two-time mode, and transition is provided during switchover of two types of coefficients. For accurately representing peak values, encrypted sampling is adopted in an absorption peak area, a sampling decrease mode is adopted outside the absorption area for shortening of the scanning time, peak valve sampling and measurement are ensured more accurately, and calculation errors brought by insufficient sampling in the absorption peak area changing strongly due to fixed-step-length scanning are decreased.
Description
Technical field
The invention belongs to moisture measurement technology, particularly to one for historical relic's protection ambient humidity monitoring method and system thereof.
Background technology
Current temperature survey is comparatively accurate, but moisture measurement, and especially the moisture measurement under special environment is a difficult problem for historical relic field environment monitoring.
Special environment generally refers to situation moisture in underground burial chamber, water environment, closing space, and historical relic includes timber, paper, silk etc., occupies larger proportion, it is therefore desirable to solve the moisture measurement of such aspect in historical relic.
Traditional humidity sensor adopts the modes such as the electric capacity of humicap, high molecular polymerization, and such mode, owing to adopting suction type to carry out moisture measurement, cannot be carried out accurate measurement, it is impossible to meet the purpose of environmental monitoring and control in high humidity situation.
Summary of the invention
The purpose of the present invention is to propose to a kind of for historical relic's protection ambient humidity monitoring method and system thereof; it is monitoring method and the system thereof of a kind of distributed fiberoptic sensor based on TDLAS technology; adopt high humidity treatment method and multiple spot monitoring mode, meet the application of historical relic high humidity.
To achieve these goals, the technical scheme is that
A kind of for historical relic's protection ambient humidity monitoring method, monitoring system utilizes TDLAS technology by fiber-optic fiber gas humidity sensor, historical relic's protection ambient humidity to be monitored, by the mode of sensor scan is carried out moisture measurement sampling, wherein, described method is: the moisture measurement of fiber-optic fiber gas humidity sensor is divided into and follows the moisture measurement that multiple wavelength of humidity change carry out, its process is: before monitoring starts, first the corresponding multiple wavelength of fiber-optic fiber gas humidity sensor are carried out linear calibration respectively, during monitoring, the different wave length changing automatic switchover fiber-optic fiber gas humidity sensor with ambient humidity carries out moisture measurement.
Scheme is further: the moisture measurement that the multiple wavelength of described correspondence carries out is the moisture measurement that corresponding two wavelength carry out, namely it is corresponding first wave length and moisture measurement that second wave length carries out, wherein, the humidity that the humidity that second wave length is measured is measured higher than first wave length, two wavelength automatically switch with two humidity stepped change and measure humidity.
Scheme is further: described linear calibration carries out at two temperatures, the linear calibration of to be 20 degrees Celsius respectively carry out 20% ~ 90% relative humidity；With 40 degrees Celsius of linear calibrations carrying out 20% ~ 90% relative humidity.
Scheme is further: described automatic switchover is the automatic switchover carried out according to the mode tackling multiple wavelength moisture measurements switching determined, its method is: first determine an absolute humidity impulsive, when humidity is more than the impulsive upper limit, the high humility switching to correspondence measures wavelength, when humidity is less than impulsive lower limit, the low humidity switching to correspondence measures wavelength.
Scheme is further: described method farther includes to regulate laser wavelength drift by temperature control modules, to reduce the linear butting error of relative humidity measurement between multiple wavelength.
Scheme is further: described method farther includes when entering second wave length and carrying out moisture measurement, and the scanning survey frequency of measurement is more than the first wave rate of scanning at least one times to moisture measurement.
A kind of for historical relic's protection ambient humidity monitoring system, including monitoring main frame and the optical circulator being connected with main frame, and the multiple fiber-optic fiber gas humidity sensors arranged in historical relic's protection environment, monitoring main frame includes data processor and laser instrument；Wherein, described optical circulator is connected with multiple fiber-optic fiber gas humidity sensor selectivitys respectively by connecting a beam splitter and variable connector.
Scheme is further: described laser instrument and a laser wavelength tuner module and laser temperature control module and connect and control.
Scheme is further: described fiber-optic fiber gas humidity sensor includes light optical coupling air chamber; light optical coupling air chamber is fixed on fiber optic protection cover one end by fixed mount; optical fiber coils in protective cover and extend into light optical coupling air chamber from the link with light optical coupling air chamber; the fiber optic protection cover other end is provided with optical fiber adpting flange; the locular wall of light optical coupling air chamber is a hollow out post housing; tested gas enters light optical coupling air chamber by hollow hole, and the arranged outside at hollow out post housing has ventilation dustproof cover.
Scheme is further: described ventilation dustproof cover is 1000 acts of nylon Air Filters.
The present invention proposes dual wavelength monitoring mode, the high humidity switching weak wavelength of absworption peak, and performs twice at for dual wavelength coefficient and demarcate respectively, provides transition in two kinds of coefficients switchings.For the feature that absworption peak peak value more at ordinary times in high humidity situation is high, for Precise Representation peak value, encryption sampling is adopted in absworption peak region, for shortening sweep time outside absorption region, reduce sample mode, ensure peak value sampling and measurement more accurately, reduce because fixed step size scans, change the calculating error that violent absworption peak area sampling brings not.
Below in conjunction with drawings and Examples, invention is described in detail.
Accompanying drawing explanation
Fig. 1 is normal humidity absworption peak situation oscillogram；
Fig. 2 is superelevation moisture absorption peak situation oscillogram；
Fig. 3 is temperature rising dual wavelength curve switching intersection point schematic diagram；
Fig. 4 is temperature decline dual wavelength curve switching intersection point schematic diagram；
Fig. 5 is system structure schematic diagram；
Fig. 6 is for controlling module diagram；
Fig. 7 is fiber-optic fiber gas humidity sensor structural representation；
Fig. 8 is light optical coupling air chamber structure schematic diagram.
Detailed description of the invention
Embodiment 1:
nullA kind of for historical relic's protection ambient humidity monitoring method，Monitoring system utilizes TDLAS(TunableDiodeLaserAbsorptionSpectroscopy) historical relic's protection ambient humidity is monitored by technology by fiber-optic fiber gas humidity sensor，By the mode of sensor scan is carried out moisture measurement sampling，Fiber-optic fiber gas humidity sensor has the different wave length sensitivity to different humidity，Wherein，Described method is: the different wave length of the foundation fiber-optic fiber gas humidity sensor sensitivity to different humidity，The moisture measurement of fiber-optic fiber gas humidity sensor is divided into and follows the moisture measurement that multiple wavelength of humidity change carry out，Its process is: before monitoring starts，First the corresponding multiple wavelength of fiber-optic fiber gas humidity sensor are carried out linear calibration respectively，During monitoring，The different wave length changing automatic switchover fiber-optic fiber gas humidity sensor with ambient humidity carries out moisture measurement.
Fig. 1 is the state of absworption peak under normal circumstances, and Fig. 2 there will be absworption peak position in coordinate system for negative value when vapour concentration height, when embodying after sampling in system and absworption peak be truncated, after being truncated, it is impossible to measure correct humidity value.Therefore the present embodiment has the absworption peak position of reply different humidity according to different wavelength, can tackle the sensitivity of different humidity for different wave length according to such feature, and segmentation detection humidity, to improve scope and the accuracy thereof of humidity control.
In the present embodiment, as a preferred version: the moisture measurement that the multiple wavelength of described correspondence carries out is the moisture measurement that corresponding two wavelength carry out, namely it is corresponding first wave length and moisture measurement that second wave length carries out, wherein, the humidity that the humidity that second wave length is measured is measured higher than first wave length, two wavelength automatically switch with two humidity stepped change and measure humidity.Therefore according to water vapor absorption peak, as Fig. 1 chooses the wavelength water vapor absorption peak at 13680-13690nm, Fig. 2 chooses the wavelength water vapor absorption peak at 1368-1369nm, and have selected the laser instrument of corresponding wavelength with this.
The benefit choosing two wave-length coverages measurements is, the different absworption peak of two absorptances is close to each other, laser wavelength drift can be regulated by temperature control modules, side-play amount meets in 2 absworption peak scopes, about 1nm, the absworption peak that can realize different absorptance is chosen, and namely dual wavelength calculates.Two wavelength automatically switch with two ambient humidity stepped change and measure humidity；In use, first carry out coefficient demarcation, under standard humidity generator, the design factor under two wavelength is demarcated respectively.Define switching mode, it is to avoid the deviation between two measurement systems occurs during switching simultaneously.Therefore, two wavelength are carried out the linear calibration that 20%-90% relative humidity carries out respectively by described linear calibration under standard humidity generator, its described linear calibration carries out at two temperatures, the linear calibration of to be 20 degrees Celsius respectively carry out 20%-90% relative humidity；With 40 degrees Celsius of linear calibrations carrying out 20%-90% relative humidity.
, its method is:
Adopting two-pressure method one, dew point hygrometer one, wherein humidity generator provides constant humidity environment, and dew point hygrometer carries out humidity environment measurement, it is provided that standard humidity.
Carry out demarcating from 20%-90% relative humidity shown in table 1:
Table 1:
Temperature rises to 20 DEG C, stabilization time 40min；
Temperature 20 DEG C, carries out demarcating from 20%-90% relative humidity shown in table 1:
Data record, reaches temperature required, humidity, and carries out after meeting stabilization time.
Recording equipment output valve, then establishing criteria value is linearly revised, and the coefficient namely completing equipment is demarcated.
After completing the demarcation of this wavelength, modulate second wave length, in this way, but humidity generator temperature controls in 40 DEG C of situations, because second wave length absorbs more weak, therefore it is applicable to measure hot and humid situation, so carrying out this test at 40 DEG C, it is determined that second wave length coefficient.
In embodiment: described automatic switchover is the automatic switchover carried out according to the mode tackling multiple wavelength moisture measurements switching determined, its method is: first determine an absolute humidity impulsive, when humidity is more than the impulsive upper limit, the high humility switching to correspondence measures wavelength, when humidity is less than impulsive lower limit, the low humidity switching to correspondence measures wavelength.
Because system is actual is the independent coefficient calculations systems of two sets, therefore should avoid when humidity system when near intersections changes constantly switches between two set parameters, therefore switching point is arranged on the intersection point of two set linear calibration's coefficients, and arranges the impulsive of 1%RH in point of intersection.Show that mode switches different coefficients according to Fig. 3 and Fig. 4 when humidity rises and humidity declines.In addition, actually point of intersection systematic error is maximum, overlaps continuous " waving " between coefficient particularly in two, is therefore reduced the measurement error of point of intersection by which.One concrete instance is: measures absolute humidity scope as the present embodiment first wave length and second wave length and determines that, substantially from absolute humidity, scope is measured from 0-60000ppm at wavelength 1369.25nm, second wave length is from 60000-590000ppm, therefore 1%RH namely from 59400ppm-60600ppm be impulsive, corresponding humidity rises, decline mode, such as ascent direction is 1369.25nm wavelength from 0-60600ppm, 60601ppm-590000ppm is second wave length, descent direction 0-59400ppm is 1369.25nm wavelength, 59401ppm-590000ppm is that second wave length is measured.
Going out optical wavelength characteristics according to semiconductor laser, laser instrument output wavelength at different temperatures has a certain amount of deviation, wavelength variation range≤1nm within the scope of general room temperature.The wavelength difference of the dual wavelength that system is selected is 0.71nm, meets wavelength regulation excursion within the scope of room temperature, and therefore selected wavelength can be regulated by temperature.
Laser wavelength regulates temperature control module by regulating laser instrument internal refrigeration storage device electric current, reaches to adjust the effect of chip of laser temperature, and then realizes modulation laser wavelength change.
Therefore, in embodiment: described method farther includes to regulate laser wavelength drift by temperature control modules, to reduce the linear butting error of relative humidity measurement between multiple wavelength.
According to absworption peak curve feature under normal circumstances, find that straight line portion as a setting is almost without change, and absworption peak changes greatly in high humidity situation, therefore higher sampling rate is adopted for absworption peak, sampling rate is reduced for straight line, but scanning element is basically unchanged, it does not have extend sweep time, increase system response time.This is the feature high for absworption peak peak value more at ordinary times in high humidity situation, for Precise Representation peak value, encryption sampling is adopted in absworption peak region, for shortening sweep time outside absorption region, reduce sample mode, ensure peak value sampling and measurement more accurately, reduce because fixed step size scans, change the calculating error that violent absworption peak area sampling brings not.
What common scanning adopted is the scan mode of fixed step size, with mathematical notation is:
Y=2n array, n=1,2,3 ... 99
The mathematical notation piecewise function of encryption scanning is expressed as:
Y=4n, 1≤n≤16；
Y=n+66,1≤n≤66；
Y=4n+132,1≤n≤16；
This algorithm ensure that sweep time is basically unchanged, because number of scan points is not changed in, but has carried out encryption sampling for changing big part in signal, have employed minimizing sampling for straight line as a setting.
Therefore, the described method in embodiment farther includes when entering second wave length and carrying out moisture measurement, and the scanning survey frequency of measurement is more than the first wave rate of scanning at least one times to moisture measurement.
Embodiment 2:
A kind of for historical relic's protection ambient humidity monitoring system; native system is to realize said method to measure the system of monitoring; as shown in Figure 5: described system includes monitoring main frame and the optical circulator being connected with main frame; and in historical relic's protection environment arrange multiple fiber-optic fiber gas humidity sensors, monitoring main frame include data processor and laser instrument；Wherein, described optical circulator is connected with multiple fiber-optic fiber gas humidity sensor selectivitys respectively by connecting a beam splitter and variable connector.This structure divides the cost that laser instrument is higher, the multimetering of system, first connects optical circulator from main frame, and then use is divided equally optical branching device and light path one is divided into four, every road light source accesses 4X16 or 4X32 road Multichannel photoswitch, and every road photoswitch adopts time-multiplexed switching polling mode.By Multichannel photoswitch, using software to control the passage that switching is different, each passage connects a humidity sensor probe, and probe makes by light optical coupling mode.Having reached the full light path unpowered work of outdoor part, the detection mode of essential safety is avoided measured zone is brought potential safety hazard.
In embodiment: as shown in Figure 6: described laser instrument and a laser wavelength tuner module and laser temperature control module and connect control.Monitoring main frame also includes supply module, realizes laser control and modulation function by changing temperature and driving current value, is namely adjusted to another 1 wavelength by temperature and wavelength tuning from 1 wavelength.Before use, first carry out coefficient demarcation, under standard humidity generator, the design factor under two wavelength is demarcated respectively.Define switching mode, it is to avoid the deviation between two measurement systems occurs during switching simultaneously.
Choosing during normal humidity and absorb bigger absworption peak, during humidity superelevation, regulate temperature control module, modulation laser wavelength, to the less absworption peak of absorptance, meets correct measurement during high humidity.
Laser instrument launches laser by optical cable transmission to detecting air chamber, and air chamber is realized by light optical coupling mode, is then reflected back signal to fiber optic cable and returns the absorption module of main frame, and main frame carries out concentration calculating by laser wavelength filtering algorithm；By software set variable step scan pattern in wavelength filtering algorithm, when the device scan time is fixing, absworption peak region is adopted encryption sampling, for shortening sweep time outside absorption region, ensures the peak value sampling in high humidity situation and measurement more accurately.
In embodiment: as shown in Figure 7; described fiber-optic fiber gas humidity sensor includes light optical coupling air chamber 1; air chamber wall has air-vent 1-1; light optical coupling air chamber is fixed on fiber optic protection cover 2 one end by fixed mount; optical fiber 3 coils in protective cover and extend into light optical coupling air chamber from the link with light optical coupling air chamber; the fiber optic protection cover other end is provided with optical fiber adpting flange 4, and protective cover 5 is fixed on the protective cover other end；As shown in Figure 8, the locular wall of described smooth optical coupling air chamber is a hollow out post housing 6, and tested gas enters light optical coupling air chamber by hollow hole 6-1, and the arranged outside at hollow out post housing has ventilation dustproof cover；Described ventilation dustproof cover is 1000 acts of nylon Air Filters.
Practical for carrying out, reduction system is each measures some cost, native system proposes a kind of Multichannel photoswitch monitoring system in conjunction with the multiple spot time division multiplex form of optical branching device, for simplied system structure, convenient construction, front end air chamber makes, by light optical coupling air chamber system, only to connect each monitoring point by an optical cable, it is not necessary to traditional mode power supply is powered.Simultaneously at high humidity environment, it is to avoid water droplet, dust etc. enter light path, block the camera lens of optics air chamber, adopt dust boot design, when designing dust cover, it is to avoid rustless steel, ferrum material corrosion after form the salt that historical relic is harmful and other harmful components, adopt copper and the dust cover of nylon composition.
Practical for carrying out, reduction system is each measures some cost, native system proposes a kind of Multichannel photoswitch monitoring system in conjunction with the multiple spot time division multiplex form of optical branching device, for simplied system structure, convenient construction, front end air chamber makes, by light optical coupling air chamber system, only to connect each monitoring point by an optical cable, it is not necessary to traditional mode power supply is powered.Simultaneously at high humidity environment, it is to avoid water droplet, dust etc. enter light path, block the camera lens of optics air chamber, adopt dust boot design, when designing dust cover, it is to avoid rustless steel, ferrum material corrosion after form the salt that historical relic is harmful and other harmful components, adopt copper and the dust cover of nylon composition.
Claims (10)
1. one kind is used for historical relic's protection ambient humidity monitoring method, monitoring system utilizes TDLAS technology by fiber-optic fiber gas humidity sensor, historical relic's protection ambient humidity to be monitored, by the mode of sensor scan is carried out moisture measurement sampling, it is characterized in that, described method is: the moisture measurement of fiber-optic fiber gas humidity sensor is divided into and follows the moisture measurement that multiple wavelength of humidity change carry out, its process is: before monitoring starts, first the corresponding multiple wavelength of fiber-optic fiber gas humidity sensor are carried out linear calibration respectively, during monitoring, the different wave length changing automatic switchover fiber-optic fiber gas humidity sensor with ambient humidity carries out moisture measurement.
2. monitoring method according to claim 1, it is characterized in that, the moisture measurement that the multiple wavelength of described correspondence carries out is the moisture measurement that corresponding two wavelength carry out, namely it is corresponding first wave length and moisture measurement that second wave length carries out, wherein, the humidity that the humidity that second wave length is measured is measured higher than first wave length, two wavelength automatically switch with two humidity stepped change and measure humidity.
3. monitoring method according to claim 2, it is characterised in that described linear calibration carries out at two temperatures is 20 degrees Celsius respectively carries out the linear calibration of 20% ~ 90% relative humidity；With 40 degrees Celsius of linear calibrations carrying out 20% ~ 90% relative humidity.
4. monitoring method according to claim 1, it is characterized in that, described automatic switchover is the automatic switchover carried out according to the mode tackling multiple wavelength moisture measurements switching determined, its method is: first determine an absolute humidity impulsive, when humidity is more than the impulsive upper limit, the high humility switching to correspondence measures wavelength, and when humidity is less than impulsive lower limit, the low humidity switching to correspondence measures wavelength.
5. monitoring method according to claim 1, it is characterised in that described method farther includes to regulate laser wavelength drift by temperature control modules, to reduce the linear butting error of relative humidity measurement between multiple wavelength.
6. monitoring method according to claim 2, it is characterised in that described method farther includes when entering second wave length and carrying out moisture measurement, and the scanning survey frequency of measurement is more than the first wave rate of scanning at least one times to moisture measurement.
7. for a historical relic's protection ambient humidity monitoring system, including monitoring main frame and the optical circulator being connected with main frame, and the multiple fiber-optic fiber gas humidity sensors arranged in historical relic's protection environment, monitoring main frame includes data processor and laser instrument；It is characterized in that, described optical circulator is connected with multiple fiber-optic fiber gas humidity sensor selectivitys respectively by connecting a beam splitter and variable connector.
8. system according to claim 7, described monitoring main frame includes laser instrument, it is characterised in that described laser instrument and a laser wavelength tuner module and laser temperature control module and connect control.
9. system according to claim 7; it is characterized in that; described fiber-optic fiber gas humidity sensor includes light optical coupling air chamber; light optical coupling air chamber is fixed on fiber optic protection cover one end by fixed mount; optical fiber coils in protective cover and extend into light optical coupling air chamber from the link with light optical coupling air chamber; the fiber optic protection cover other end is provided with optical fiber adpting flange; the locular wall of light optical coupling air chamber is a hollow out post housing; tested gas enters light optical coupling air chamber by hollow hole, and the arranged outside at hollow out post housing has ventilation dustproof cover.
10. system according to claim 9, it is characterised in that described ventilation dustproof cover is 1000 acts of nylon Air Filters.
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Cited By (6)
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| CN106596466A (en) * | 2016-12-12 | 2017-04-26 | 北京航天易联科技发展有限公司 | Optical fiber sensor humidity measurement calibration device and optical fiber sensor humidity measurement calibration method |
| CN109556755A (en) * | 2018-12-19 | 2019-04-02 | 北京航天易联科技发展有限公司 | A kind of humiture measurement mechanism in brewery's ferment pond |
| CN109781299A (en) * | 2018-12-21 | 2019-05-21 | 北京航天易联科技发展有限公司 | A kind of white wine pit optical fiber temperature humidity detection topological system and method |
| CN110031125A (en) * | 2019-03-06 | 2019-07-19 | 北京航天易联科技发展有限公司 | A kind of optical fiber temperature humidity sensing system |
| CN113916828A (en) * | 2021-09-30 | 2022-01-11 | 北京光感慧智科技有限公司 | Humidity measurement method and system based on TDLAS technology |
| CN114324211A (en) * | 2021-12-30 | 2022-04-12 | 北京光感慧智科技有限公司 | Processing method of laser measurement signal and multi-wavelength laser measurement system |
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| CN109781299A (en) * | 2018-12-21 | 2019-05-21 | 北京航天易联科技发展有限公司 | A kind of white wine pit optical fiber temperature humidity detection topological system and method |
| CN110031125A (en) * | 2019-03-06 | 2019-07-19 | 北京航天易联科技发展有限公司 | A kind of optical fiber temperature humidity sensing system |
| CN113916828A (en) * | 2021-09-30 | 2022-01-11 | 北京光感慧智科技有限公司 | Humidity measurement method and system based on TDLAS technology |
| CN114324211A (en) * | 2021-12-30 | 2022-04-12 | 北京光感慧智科技有限公司 | Processing method of laser measurement signal and multi-wavelength laser measurement system |
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