CN105738318B - One kind being used for historical relic's protection ambient humidity monitoring method and its system - Google Patents
One kind being used for historical relic's protection ambient humidity monitoring method and its system Download PDFInfo
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- 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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- 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
- G01N2021/396—Type of laser source
- G01N2021/399—Diode laser
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Abstract
The invention discloses one kind being used for historical relic's protection ambient humidity monitoring method and its system, and the moisture measurement of fiber-optic fiber gas humidity sensor is divided into the measurement that the multiple wavelength for following humidity to change carry out, and process is：Before monitoring starts, multiple wavelength are corresponded to fiber-optic fiber gas humidity sensor first and carry out linear calibration respectively, when monitoring, automatically switches the different wave length measurement humidity of fiber-optic fiber gas humidity sensor with variation of ambient temperature.The present invention proposes dual wavelength monitoring mode, and high humidity switches the weak wavelength of absorption peak, and is demarcated respectively twice for dual wavelength coefficient, and transition is provided in two kinds of coefficients switch.It for Precise Representation peak value, is sampled using encryption in absorption peak region, is shortening sweep time outside absorption region, reduce sample mode, more accurately ensure peak value sampling and measurement, reduces because fixed step size scans, change the calculating error that violent absorption peak area sampling is not enough brought.
Description
Technical field
The invention belongs to moisture measurement technologies, more particularly to a kind of to be used for historical relic's protection ambient humidity monitoring method and its be
System.
Background technology
Temperature measures more accurate at present, but the moisture measurement under moisture measurement, especially particular surroundings is historical relic neck
The problem of domain environmental monitoring.
Particular surroundings generally refers to situation aqueous in underground burial chamber, water environment, enclosure space, historical relic include timber,
Paper, silk goods etc., occupy larger proportion in historical relic, it is therefore desirable to solve the moisture measurement in terms of such.
Traditional humidity sensor is using humicap, the modes such as capacitance of high molecular polymerization, such mode is due to using
Suction type carries out moisture measurement, can not accurately be measured in high humidity, cannot be satisfied the mesh of environmental monitoring and control
's.
Invention content
The purpose of the present invention is to propose to one kind being used for historical relic's protection ambient humidity monitoring method and its system, be that one kind is based on
The monitoring method and its system of the distributed fiberoptic sensor of TDLAS technologies, using high humidity treatment method and multiple spot monitoring mode,
Meet historical relic high humidity application.
To achieve the goals above, the technical scheme is that：
One kind being used for historical relic's protection ambient humidity monitoring method, and monitoring system is wet by fiber-optic fiber gas using TDLAS technologies
Degree sensor is monitored historical relic's protection ambient humidity, and moisture measurement sampling is carried out by way of being scanned to sensor,
In, the method is：The moisture measurement of fiber-optic fiber gas humidity sensor is divided into the multiple wavelength for following humidity to change to carry out
Moisture measurement, process is：Monitoring start before, first to fiber-optic fiber gas humidity sensor correspond to multiple wavelength respectively into
Row linear calibration when monitoring, changes with ambient humidity and automatically switches the different wave length of fiber-optic fiber gas humidity sensor and carry out humidity
It measures.
Scheme is further：The moisture measurement that the multiple wavelength of correspondence carry out is that the humidity that corresponding two wavelength carry out is surveyed
Amount is the moisture measurement that corresponding first wave length and second wave length carry out, wherein the humidity that second wave length measures is higher than first wave
The long humidity measured, two wavelength automatically switch to measure humidity with two humidity stepped changes.
Scheme is further：The linear calibration carries out at two temperatures, is respectively 20 degrees Celsius and carries out 20%
The linear calibration of ~ 90% relative humidity；With the linear calibration of 40 degrees Celsius of 20% ~ 90% relative humidity of progress.
Scheme is further：The automatic switchover is in the way of the multiple wavelength moisture measurement switchings of determining reply
The automatic switchover of progress, method are：An absolute humidity impulsive is determined first, when humidity is more than the impulsive upper limit
When, it switches to corresponding high humility and measures wavelength, when humidity is less than impulsive lower limit, switches to corresponding low humidity and measure
Wavelength.
Scheme is further：The method further includes adjusting laser wavelength drift by temperature control modules, with
Reduce the linear butting error of relative humidity measurement between multiple wavelength.
Scheme is further：The method further includes when entering second wave length progress moisture measurement, measurement is swept
Retouch scan frequency at least one times of the measurement frequency more than first wave to moisture measurement.
One kind monitoring system for historical relic's protection ambient humidity, including the ring of light shape for monitoring host and being connected with host
Device, and multiple fiber-optic fiber gas humidity sensors for being arranged in historical relic's protection environment, monitoring host include data processor and
Laser；Wherein, the optical circulator is passed with multiple fiber-optic fiber gas humidity respectively by connecting an optical splitter and variable connector
Sensor selectively connects.
Scheme is further：The laser and a laser wavelength tuner module and laser temperature control module connect
Connect control.
Scheme is further：The fiber-optic fiber gas humidity sensor includes light optical coupling gas chamber, and light optical coupling gas chamber passes through
Fixed frame is fixed on fiber optic protection cover one end, and optical fiber is coiled in protective cover and extend into from the connecting pin with light optical coupling gas chamber
In light optical coupling gas chamber, the fiber optic protection cover other end is provided with optical fiber connecting flange, the locular wall of light optical coupling gas chamber is one
Hollow out column shell, tested gas enter light optical coupling gas chamber by hollow hole, are provided on the outside of hollow out column shell ventilative anti-
Dust hood.
Scheme is further：The ventilation dustproof cover is 1000 acts of nylon Air Filters.
The present invention proposes dual wavelength monitoring mode, and high humidity switches the weak wavelength of absorption peak, and is carried out for dual wavelength coefficient
It demarcates respectively twice, transition is provided in two kinds of coefficients switch.For the feature high compared with usually peak value of absorption peak in the case of high humidity,
It for Precise Representation peak value, is sampled using encryption in absorption peak region, to shorten sweep time outside absorption region, reduces sampling
Mode more accurately ensures peak value sampling and measurement, reduces because fixed step size scans, changes violent absorption peak region and adopt
The calculating error that sample is not enough brought.
Invention is described in detail with reference to the accompanying drawings and examples.
Description of the drawings
Fig. 1 is normal humidity absorption peak situation oscillogram；
Fig. 2 is superelevation moisture absorption peak situation oscillogram；
Fig. 3 is that temperature rise dual wavelength curve switches intersection point schematic diagram；
Fig. 4 is that temperature declines dual wavelength curve switching intersection point schematic diagram；
Fig. 5 is system structure diagram；
Fig. 6 module diagrams in order to control；
Fig. 7 is fiber-optic fiber gas humidity sensor structural schematic diagram；
Fig. 8 is light optical coupling air chamber structure schematic diagram.
Specific implementation mode
Embodiment 1：
One kind being used for historical relic's protection ambient humidity monitoring method, and monitoring system utilizes TDLAS（Tunable Diode
Laser Absorption Spectroscopy）Technology by fiber-optic fiber gas humidity sensor to historical relic's protection ambient humidity into
Row monitoring, carries out moisture measurement sampling by way of being scanned to sensor, and fiber-optic fiber gas humidity sensor has different wave length
To the sensibility of different humidity, wherein the method is：Different wave length according to fiber-optic fiber gas humidity sensor is to different humidity
Sensibility, the moisture measurement of fiber-optic fiber gas humidity sensor is divided into follow humidity change multiple wavelength carry out humidity
It measures, process is：Before monitoring starts, multiple wavelength are corresponded to fiber-optic fiber gas humidity sensor first and are carried out respectively linearly
Calibration when monitoring, changes with ambient humidity and automatically switches the different wave length of fiber-optic fiber gas humidity sensor and carry out moisture measurement.
Fig. 1 is the state of absorption peak under normal circumstances, and Fig. 2 is to will appear i.e. absorption peak position when vapour concentration is high sitting
It is negative value in mark system, when embodying after sampling in system, that is, absorption peak is truncated, after being truncated, it is unable to measure correct humidity
Value.Therefore the present embodiment has the absorption peak position of reply different humidity according to different wavelength, permissible according to such feature
The sensibility of different humidity, segmentation detection humidity, to improve the range and its accuracy of humidity control are coped with for different wave length.
In the present embodiment, as a preferred embodiment：The moisture measurement that the multiple wavelength of correspondence carry out is corresponding two
The moisture measurement that a wavelength carries out is the moisture measurement that corresponding first wave length and second wave length carry out, wherein second wave length is surveyed
The humidity of amount is higher than the humidity that first wave length measures, and two wavelength automatically switch to measure humidity with two humidity stepped changes.Cause
This chooses wavelength at the water vapor absorption peak of 13680-13690nm according to water vapor absorption peak, such as Fig. 1, and Fig. 2 chooses wavelength in 1368-
The water vapor absorption peak of 1369nm, and selected with this laser of corresponding wavelength.
It is that two different absorption peaks of absorption coefficient are close to each other, Ke Yitong to choose the benefit that two wave-length coverages measure
Excess temperature control module adjusts laser wavelength drift, and offset meets in 2 absorption peak ranges, and about 1nm may be implemented not
Absorption peak with absorption coefficient is chosen, i.e., dual wavelength calculates.Two wavelength automatically switch to survey with two ambient humidity stepped changes
Measure humidity；When in use, it is demarcated first into row coefficient, to the design factor under two wavelength point under standard humidity generator
It does not demarcate.Switching mode is defined simultaneously, avoids the deviation for occurring between two measuring systems when switching.Therefore, described linear
Calibration is that respectively two wavelength are carried out with the linear calibration of 20%-90% relative humidity progress under standard humidity generator,
The linear calibration carries out at two temperatures, is the linear mark of 20 degrees Celsius of progress 20%-90% relative humidity respectively
It is fixed；With the linear calibration of 40 degrees Celsius of progress 20%-90% relative humidity.
, method is：
Using two-pressure method one, dew point hygrometer one, wherein humidity generator provides constant humidity environment, dew
Point instrument carries out humidity environment measurement, provides standard humidity.
It is demarcated from 20%-90% relative humidity according to progress shown in table 1：
Table 1：
Temperature rises to 20 DEG C, stabilization time 40min；
20 DEG C of temperature is demarcated according to progress shown in table 1 from 20%-90% relative humidity：
Data record reaches required temperature, humidity, and is carried out after meeting stabilization time.
Recording equipment output valve, then establishing criteria value linearly corrected, that is, complete equipment coefficient calibration.
After the calibration for completing the wavelength, second wave length is modulated, in this way, but the control of humidity generator temperature is 40
In the case of DEG C, because second wave length absorption is weaker, therefore suitable for measuring high temperature and humidity situation, so carrying out the examination at 40 DEG C
It tests, determines second wave length coefficient.
In embodiment：The automatic switchover be by it is determining multiple wavelength moisture measurements should be switched in the way of carry out
Automatic switchover, method is：An absolute humidity impulsive is determined first, when humidity is more than the impulsive upper limit, is cut
It shifts to corresponding high humility and measures wavelength, when humidity is less than impulsive lower limit, switches to corresponding low humidity and measure wavelength.
Because practical system is two sets of independent coefficient counting systems, therefore should be avoided when humidity is when near intersections change
System constantly switches between two sets of parameters, therefore the intersection point in two sets of linear calibration's coefficients is arranged in switching point, and is set in point of intersection
Set the impulsive of 1%RH.Show that mode switches different coefficients according to Fig. 3 and Fig. 4 when humidity rises and humidity declines.Except this it
Outside, actually point of intersection systematic error is maximum, especially between two sets of coefficients continuous " waving ", therefore reduces by this way
The measurement error of point of intersection.One concrete instance is：Absolute humidity is measured as the present embodiment first wave length and second wave length
What range was to determine, substantially in terms of absolute humidity, in wavelength 1369.25nm measurement ranges from 0-60000ppm, second wave length
From 60000-590000ppm, therefore 1%RH is impulsive, corresponding humidity up and down side from 59400ppm-60600ppm
Formula, such as ascent direction are 1369.25nm wavelength from 0-60600ppm, and 60601ppm-590000ppm is second wave length, are declined
Direction 0-59400ppm is 1369.25nm wavelength, and 59401ppm-590000ppm measures for second wave length.
Go out optical wavelength characteristics according to semiconductor laser, laser at different temperatures output wavelength have it is a certain amount of partially
Difference, wavelength variation range≤1nm within the scope of general room temperature.The wavelength difference of the selected dual wavelength of system is 0.71nm, meets room temperature
Wavelength regulation variation range in range, therefore selected wavelength can be adjusted by temperature.
Laser wavelength adjusts temperature control module by adjusting laser internal refrigeration storage device electric current, reaches adjustment chip of laser
The effect of temperature, and then realize modulation laser wavelength variation.
Therefore, in embodiment：The method further includes adjusting laser wavelength drift by temperature control modules, with
Reduce the linear butting error of relative humidity measurement between multiple wavelength.
According to absorption peak curve feature under normal circumstances, it is found that the straight line portion as background is almost unchanged, and high humidity
In the case of absorption peak change greatly, therefore for absorption peak use higher sampling rate, for straight line reduce sampling rate, but
It is that scanning element is basically unchanged, does not extend sweep time, increases system response time.This be for absorption peak in the case of high humidity compared with
The usually high feature of peak value is sampled in absorption peak region using encryption for Precise Representation peak value, is shortening outside absorption region
Sweep time reduces sample mode, more accurately ensures peak value sampling and measurement, reduces because fixed step size scans, variation
The calculating error that violent absorption peak area sampling is not enough brought.
Common scanning is with mathematical notation using the scan mode of fixed step size：
Y=2n arrays, n=1,2,3 ... 99
The mathematical notation of encryption scanning is expressed as with piecewise function：
Y=4n, 1≤n≤16；
Y=n+66,1≤n≤66；
Y=4n+132,1≤n≤16；
The algorithm ensure that sweep time is basically unchanged, because number of scan points does not change, but for changing in signal
Big part has carried out encryption sampling, for using reduction sampling as the straight line of background.
Therefore, in embodiment the method further includes when enter second wave length carry out moisture measurement when, measurement
Scanning survey frequency is more than scan frequency at least one times of the first wave to moisture measurement.
Embodiment 2：
One kind monitoring system for historical relic's protection ambient humidity, and this system is the system realized the above method and measure monitoring,
As shown in Figure 5：The system comprises monitoring hosts and the optical circulator being connected with host, and are set in historical relic's protection environment
The multiple fiber-optic fiber gas humidity sensors set, monitoring host includes data processor and laser；Wherein, the optical circulator is logical
One optical splitter of connection and variable connector is crossed selectively to connect with multiple fiber-optic fiber gas humidity sensors respectively.This structure is divided sharp
The higher cost of light device, the multimetering of system connect optical circulator first from host, then will using respectively optical branching device
It is four that light path one, which is divided, 4 X 16 or 4 X, 32 road Multichannel photoswitchs is accessed per road light source, per road photoswitch using time division multiplexing
Switching polling mode.By Multichannel photoswitch, switch different channels using software control, each channel connects a humidity
Sensor probe, probe use light optical coupling mode.The full light path unpowered work of outdoor part, the detection of essential safety are reached
Mode avoids bringing security risk to measured zone.
In embodiment：As shown in Figure 6：The laser and a laser wavelength tuner module and laser temperature control
Module connection control.It further includes power supply module to monitor host, by change temperature and driving current value realize laser control and
Modulation function is adjusted from 1 wavelength by temperature and wavelength tuning to another 1 wavelength.Before use, first into row coefficient mark
It is fixed, the design factor under two wavelength is demarcated respectively under standard humidity generator.Switching mode is defined simultaneously, is avoided
Occurs the deviation between two measuring systems when switching.
It is chosen when normal humidity and absorbs larger absorption peak, when humidity superelevation, adjusted temperature control module, modulate laser wavelength
The absorption peak smaller to absorption coefficient, meets correct measurement when high humidity.
Laser emits laser by optical cable transmission to gas chamber is detected, and gas chamber is realized by light optical coupling mode, is then reflected
Letter in reply number returns an absorption module for host to fiber optic cable, and host passes through laser wavelength filtering algorithm and carries out concentration calculating；?
It is fixed in the device scan time by software set variable step scan pattern in wavelength filtering algorithm, to absorption peak
Region is sampled using encryption, to shorten sweep time outside absorption region, more accurately ensures that the peak value in the case of high humidity is adopted
Sample and measurement.
In embodiment：As shown in fig. 7, the fiber-optic fiber gas humidity sensor includes light optical coupling gas chamber 1, have on air chamber wall
Air hole 1-1, light optical coupling gas chamber are fixed on 2 one end of fiber optic protection cover by fixed frame, optical fiber 3 coiled in protective cover and from
It is extend into light optical coupling gas chamber with the connecting pin of light optical coupling gas chamber, the fiber optic protection cover other end is provided with optical fiber connection method
Orchid 4, protective cover 5 is fixed on the protective cover other end；As shown in figure 8, the locular wall of the smooth optical coupling gas chamber is a hollow out column
Shell 6, tested gas enter light optical coupling gas chamber by hollow hole 6-1, ventilation dustproof are provided on the outside of hollow out column shell
Cover；The ventilation dustproof cover is 1000 acts of nylon Air Filters.
It is practical to carry out, each measurement point cost of system is reduced, this system proposes a kind of Multichannel photoswitch combination light
The monitoring system of the multiple spot time division multiplexing form of splitter, is simplied system structure, construction, front end gas chamber is facilitated to use light optocoupler
Gas chamber system is closed, each monitoring point is only connected by an optical cable, is not necessarily to traditional mode power supply power supply.Simultaneously in high humidity ring
Border avoids water droplet, dust etc. from entering light path, blocks the camera lens of optics gas chamber, using dust boot design, when designing dust cover,
It is formed to the harmful salt of historical relic and other harmful components after avoiding the material corrosion of stainless steel, iron, is formed using copper and nylon
Dust cover.
It is practical to carry out, each measurement point cost of system is reduced, this system proposes a kind of Multichannel photoswitch combination light
The monitoring system of the multiple spot time division multiplexing form of splitter, is simplied system structure, construction, front end gas chamber is facilitated to use light optocoupler
Gas chamber system is closed, each monitoring point is only connected by an optical cable, is not necessarily to traditional mode power supply power supply.Simultaneously in high humidity ring
Border avoids water droplet, dust etc. from entering light path, blocks the camera lens of optics gas chamber, using dust boot design, when designing dust cover,
It is formed to the harmful salt of historical relic and other harmful components after avoiding the material corrosion of stainless steel, iron, is formed using copper and nylon
Dust cover.
Claims (8)
1. one kind being used for historical relic's protection ambient humidity monitoring method, monitoring system passes through fiber-optic fiber gas humidity using TDLAS technologies
Sensor is monitored historical relic's protection ambient humidity, and moisture measurement sampling is carried out by way of being scanned to sensor, special
Sign is that the method is：The moisture measurement of fiber-optic fiber gas humidity sensor is divided into the multiple wavelength for following humidity to change
The moisture measurement of progress, process are：Before monitoring starts, multiple wavelength point are corresponded to fiber-optic fiber gas humidity sensor first
It does not carry out linear calibration, when monitoring, changes with ambient humidity and automatically switch the different wave length of fiber-optic fiber gas humidity sensor and carry out
Moisture measurement；The moisture measurement that the multiple wavelength of correspondence carry out is the moisture measurement that corresponding two wavelength carry out, and is corresponding
The moisture measurement that first wave length and second wave length carry out, wherein the humidity that second wave length measures is wet higher than what first wave length measured
Degree, two wavelength automatically switch to measure humidity with two humidity stepped changes.
2. monitoring method according to claim 1, which is characterized in that the linear calibration is to carry out at two temperatures
, it is the linear calibration of 20 degrees Celsius of 20% ~ 90% relative humidity of progress respectively；With 40 degrees Celsius of 20% ~ 90% relative humidity of progress
Linear calibration.
3. monitoring method according to claim 1, which is characterized in that the automatic switchover is more according to determining reply
The automatic switchover that the mode of a wavelength moisture measurement switching carries out, method are：An absolute humidity impulsive is determined first,
When humidity is more than the impulsive upper limit, switches to corresponding high humility and measure wavelength, when humidity is less than impulsive lower limit,
It switches to corresponding low humidity and measures wavelength.
4. monitoring method according to claim 1, which is characterized in that the method further includes controlling mould by temperature
Block adjusts laser wavelength drift, to reduce the linear butting error of relative humidity measurement between multiple wavelength.
5. monitoring method according to claim 1, which is characterized in that the method further includes working as to enter second wave length
When carrying out moisture measurement, the scanning survey frequency of measurement is more than scan frequency at least one times of the first wave to moisture measurement.
6. one kind monitoring system for historical relic's protection ambient humidity, including the optical circulator for monitoring host and being connected with host,
And the multiple fiber-optic fiber gas humidity sensors being arranged in historical relic's protection environment, monitoring host includes data processor and laser
Device；It is characterized in that, the optical circulator by connect an optical splitter and variable connector respectively with multiple fiber-optic fiber gas humidity
Sensor selectivity connects；The fiber-optic fiber gas humidity sensor includes light optical coupling gas chamber, and light optical coupling gas chamber passes through fixation
Frame is fixed on fiber optic protection cover one end, and optical fiber coils in protective cover and extend into light light from the connecting pin with light optical coupling gas chamber
It couples in gas chamber, the fiber optic protection cover other end is provided with optical fiber connecting flange, the locular wall of light optical coupling gas chamber is a hollow out
Column shell, tested gas enter light optical coupling gas chamber by hollow hole, ventilation dustproof cover are provided on the outside of hollow out column shell.
7. system according to claim 6, the monitoring host includes laser, which is characterized in that the laser with
One laser wavelength tuner module connects control with laser temperature control module.
8. system according to claim 6, which is characterized in that the ventilation dustproof cover is 1000 mesh nylon Air Filters.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106596466B (en) * | 2016-12-12 | 2019-01-08 | 北京航天易联科技发展有限公司 | A kind of fibre optical sensor moisture measurement caliberating device and 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 |
| CN113916828B (en) * | 2021-09-30 | 2022-05-27 | 北京光感慧智科技有限公司 | Humidity measurement method and system based on TDLAS technology |
| CN114324211B (en) * | 2021-12-30 | 2022-10-04 | 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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| CN101424623A (en) * | 2008-11-12 | 2009-05-06 | 西安金和光学科技有限公司 | Optical fibre grating sensor |
| CN101799408A (en) * | 2010-01-08 | 2010-08-11 | 山东省科学院激光研究所 | Optical fiber multi-parameter detector for gas power generation |
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| CN101424623A (en) * | 2008-11-12 | 2009-05-06 | 西安金和光学科技有限公司 | Optical fibre grating sensor |
| CN101799408A (en) * | 2010-01-08 | 2010-08-11 | 山东省科学院激光研究所 | Optical fiber multi-parameter detector for gas power generation |
| CN101825562A (en) * | 2010-03-15 | 2010-09-08 | 李捍东 | Method for detecting coal mine gas concentration based on dual wavelength laser |
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