CN106525097B - A kind of tunable laser wavelength detecting method and device - Google Patents
A kind of tunable laser wavelength detecting method and device Download PDFInfo
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- CN106525097B CN106525097B CN201611140880.8A CN201611140880A CN106525097B CN 106525097 B CN106525097 B CN 106525097B CN 201611140880 A CN201611140880 A CN 201611140880A CN 106525097 B CN106525097 B CN 106525097B
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- 239000004065 semiconductor Substances 0.000 claims description 11
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/26—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light
- G01D5/32—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light
- G01D5/34—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells
- G01D5/353—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre
- G01D5/35338—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable characterised by optical transfer means, i.e. using infrared, visible, or ultraviolet light with attenuation or whole or partial obturation of beams of light the beams of light being detected by photocells influencing the transmission properties of an optical fibre using other arrangements than interferometer arrangements
- G01D5/35341—Sensor working in transmission
- G01D5/35351—Sensor working in transmission using other means to detect the measured quantity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D21/00—Measuring or testing not otherwise provided for
- G01D21/02—Measuring two or more variables by means not covered by a single other subclass
Abstract
The present invention relates to a kind of tunable laser wavelength detecting method and devices, wherein detection method includes the following steps: to make driving current-photocurrent curve；Make driving current-central wavelength curve；Root driving current-photocurrent curve and driving current-central wavelength curve obtain central wavelength-photocurrent curve；Central wavelength-photocurrent curve under first state is made, obtains the central wavelength of the first fiber grating；Central wavelength-photocurrent curve under the second state is made, obtains the central wavelength of the second fiber grating；The central wavelength of the central wavelength and the second fiber grating that compare the first fiber grating is the drift value of physics Parameters variation fiber bragg grating center wavelength to be measured, according to the variable quantity of drift value you can get it physical parameter to be measured.This method principle is simple, is easily achieved, and can determine the variable quantity of physical parameter by detecting the drift value of sharp central wavelength using the equipment of above-mentioned principle, small in size, at low cost.
Description
Technical field
The invention belongs to laser equipment detection technique fields, and in particular to a kind of tunable laser wavelength detecting method and dress
It sets.
Background technique
The method of existing Detection wavelength drift value mainly uses bragg filter to carry out Wavelength demodulation, Prague
Grating has the property of reflection specific wavelength, when a beam of broad spectrum light passes through Bragg grating, meets fiber grating Prague
The wavelength of condition will generate reflection, remaining wavelength continues to transmit through fiber grating.When the temperature or pressure in the grating external world change
When change, the central wavelength of optical grating reflection light can drift about, and the external world is then determined by the drift value of inspection center's wavelength
The variable quantity of the physical parameters such as temperature or pressure.
Bragg filter is based primarily upon the wavelength for scanning narrow-band light source and F-P etalon of tunable TEA CO2 laser
Calibration, there are some reference optical elements in inside, and F-P standard has certain volume, so shape is larger, is not suitable for often
It is mobile.On the other hand, due to containing many precison optical components and optical texture inside equipment, so expensive.
Summary of the invention
The present invention is intended to provide a kind of tunable laser wavelength detecting method and apparatus, this method principle is simple, it is real to be easy to
It is existing, and using the equipment of above-mentioned principle the variable quantity of physical parameter, body can be determined by detecting the drift value of sharp central wavelength
Product is small, at low cost.
To achieve the above object, the detection method of tunable laser wavelength provided by the present invention, includes the following steps:
S1: the luminous end of laser is connect with optical detector, defeated to laser in the state of physics parameter constant to be measured
Enter the driving current increased at equal intervals, and record the photocurrent values that optical detector exports under each driving current, makes driving current-
Photocurrent curve；
S2: physics parameter constant to be measured and identical as the physical parameter to be measured in S1 is kept, increases the driving at equal intervals
Electric current, and the spectrum of laser under each driving current and the central wavelength that writing laser is luminous are recorded, it makes in driving current-
Heart wavelength curve；
S3: driving current obtained in driving current-photocurrent curve and S2 according to obtained in S1-central wavelength curve
Obtain central wavelength-photocurrent curve；
S4: returning to the light intensity of optical detector with optical detector detection light grid, and is converted into electric current output, according to S1-S3
It obtains central wavelength-photocurrent curve under first state, obtains the central wavelength of the first fiber grating；
S5: when the physical parameter to be measured changes, central wavelength-light under the second state is obtained according to S1-S3
Current curve obtains the central wavelength of the second fiber grating；
S6: the central wavelength of comparison first fiber grating and the central wavelength of second fiber grating, as to
The drift value for surveying physical parameter variation fiber bragg grating center wavelength, according to the change of the drift value you can get it physical parameter to be measured
Change amount.
In S1, it is passed through driving current to laser, laser shines, and the light that then laser is issued is by laser acquisition
Device is converted into photoelectric current, realizes the conversion of electrical-optical-optical-electronic, keeps laser in the case where physics parameter constant to be measured, to
Laser is passed through the electric current increased at equal intervals, and the driving current of laser is every to change primary, the photoelectricity of record optical detector output
Flow valuve simultaneously records, and after being completed, obtains the straight line that a slope is greater than 0 by the variation relation of driving current and photoelectric current,
That is driving current-photocurrent curve.Then in S2, keep physical parameter to be measured identical with S1, between being passed through etc. to laser
Every the driving current of increase, driving current is every to be changed primary, tests the spectrum of a laser and during writing laser shines
Cardiac wave is long, obtains driving current-central wavelength curve.In S3, pass through driving current-photocurrent curve obtained in S1
With driving current-central wavelength curve obtained in S2, the first central wavelength-photocurrent curve is obtained to get to center
The relationship of wavelength and photoelectric current.
The above S1-S3 is the modulator approach of grating adjusting apparatus, i.e., is exported by laser drive current and optical detector
The relationship and laser drive current of photoelectric current and the relationship of laser center wavelength obtain the relationship of central wavelength and photoelectric current.
Fiber grating is accessed into demodulating system, the light intensity of optical detector is then returned to optical detector detection light grid.When
When outside environmental elements are stablized, optical detector detects the light intensity of return and is converted into electric current output, obtains under first state
Central wavelength-photocurrent curve, at this time from the curve it can be concluded that, in the wavelength modulation range of laser, have one specific
The corresponding photoelectric current of wavelength it is very big, illustrate optical detector have received fiber grating return light, due to grating only to spy
The long light of standing wave has reflex, other wavelength can then penetrate grating, so curve other positions light intensity is weaker, it can thus be concluded that going out
The central wavelength of first fiber grating.And after physical parameter to be measured changes, it is obtained under the second state according to S1-S3
Photoelectric current-central wavelength curve, and then obtain the central wavelength of the second fiber grating.
Finally, the comparison changed by the curve graph of S4 and S5, can show that different curves correspond to the changing value of central wavelength,
The drift value of physics Parameters variation fiber bragg grating center wavelength as to be measured, and then physics ginseng to be measured can be obtained according to the drift value
Several variable quantities.
The central wavelength of fiber grating reflected light depends on the fringe spacing of grating, and fringe spacing is answered by what is applied
What the physical parameters such as change or temperature were determined, when extraneous physics Parameters variation, the fringe spacing of grating can change, optical fiber
The central wavelength of grating can move, we can determine the variation of physical parameter by the offset of Detection wavelength.Above-mentioned side
Method principle is simple and easy to accomplish, small in size without using F-P filter or F-P etalon etc. during realization, and cost
It is low.
It preferably, before step S 4, further include step S31: if the modulation range of laser is not covered with optical fiber light
The photoelectric current of the central wavelength of grid, optical detector output is almost equal to zero, and adjusts the modulation range of laser, it is made to cover optical fiber
The central wavelength of grating.
Preferably, the physical parameter is temperature parameter, strain parameter, pressure parameter, displacement parameter, level parameter, adds
Speed parameter, gas content parameter or bending parameters.
Preferably, increase driving current value at equal intervals are as follows: 150mA is increased to from 0mA with the interval of 0.1mA.
In addition, the detection device of tunable laser wavelength provided by the present invention, including semiconductor laser with tunable, drive
Dynamic circuit board, optical detector, optical fiber circulator and grating；The first port and tunable semiconductor laser of the optical fiber circulator
The output end of device is connected, and second port is connected with the grating, and third port is connected with the laser detector, the driving electricity
Road plate can detect the variable quantity of physical parameter to be measured according to the detection method of above-mentioned tunable laser wavelength.
The tunable laser wavelength detecting device can be only by semiconductor laser with tunable, drive circuit board, optical detector
It is formed with optical fiber circulator, wherein drive circuit board can pass through tunable half according to the detection method of above-mentioned tunable laser wavelength
Conductor laser detector and optical fiber circulator measure physical parameter to be measured, the tunable laser wavelength detecting apparatus body
Product is smaller, easy to remove, easy to use, and the installation cost is lower.
It preferably, further include multiplexer, the quantity of the optical detector is two or more, each optical detector string
Connection, and the output end of each optical detector is connect with the multiplexer.
It preferably, further include shell, the semiconductor laser with tunable, the drive circuit board and the fiber annular
Device is respectively positioned in the shell.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.
Fig. 1 is the flow diagram of the tunable laser wavelength detecting method of the embodiment of the present invention 1；
Fig. 2 is the detailed process block diagram of the tunable laser wavelength detecting method of the embodiment of the present invention 1；
Fig. 3 is driving current-photocurrent curve of the detection temperature of the embodiment of the present invention 1；
Fig. 4 is driving current-central wavelength curve of the detection temperature of the embodiment of the present invention 1；
Fig. 5 is central wavelength-photocurrent curve of the detection temperature of the embodiment of the present invention 1；
Fig. 6 is central wavelength-photocurrent curve under the first state of the detection temperature of the embodiment of the present invention 1；
Fig. 7 is central wavelength-photocurrent curve under the second state of the detection temperature of the embodiment of the present invention 1；
Fig. 8 is central wavelength-photocurrent curve that the photoelectric current of the detection temperature of the embodiment of the present invention 1 is zero.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
Embodiment 1
The embodiment of the present invention provides a kind of tunable laser wavelength detecting method, as shown in Figure 1, including the following steps:
S1: the luminous end of laser is connect with optical detector, in the state that temperature is constant at equal intervals to laser input
The driving current of increase, and the photocurrent values that optical detector exports under each driving current are recorded, it is bent to make driving current-photoelectric current
Line.That is, being passed through driving current to laser, laser shines, and the light that then laser is issued is by laser detector
It is converted into photoelectric current, realizes the conversion of electrical-optical-optical-electronic, keeps laser in the case where temperature is constant, is passed through to laser
The electric current increased at equal intervals, the driving current of laser is every to change primary, the photocurrent values and record of record optical detector output,
After being completed, the straight line that a slope is greater than 0, i.e. driving current-are obtained by the variation relation of driving current and photoelectric current
Photocurrent curve, as shown in Figure 3.
S2: keeping temperature constant and identical as the temperature in S1, increases driving current at equal intervals, and driving current is every to change one
It is secondary, the central wavelength that the spectrum of a laser and writing laser shine is tested, driving current-central wavelength curve is obtained,
As shown in Figure 4.
S3: driving current obtained in driving current-photocurrent curve and S2 according to obtained in S1-central wavelength curve
Obtain central wavelength-photocurrent curve, as shown in Figure 5；Obtain the relationship of central wavelength and photoelectric current.
The above S1-S3 is the modulator approach of grating adjusting apparatus, i.e., is exported by laser drive current and optical detector
The relationship and laser drive current of photoelectric current and the relationship of laser center wavelength obtain the pass of central wavelength and photoelectric current
System.
S4: accessing demodulating system for fiber grating, when outside environmental elements are stablized, is returned with optical detector detection light grid
To the light intensity of optical detector, and it is converted into electric current output, it is bent to make the central wavelength under first state-photoelectric current according to S1-S3
Line, as shown in fig. 6, at this point, it can be concluded that, in the wavelength modulation range of laser, there is a specific wavelength from the curve
Corresponding photoelectric current is very big, illustrates that optical detector has received the light of fiber grating return, since grating is only to specific wavelength
Light have reflex, other wavelength then can penetrate grating, so curve other positions light intensity is weaker, it can thus be concluded that the first light out
The central wavelength of fine grating.
S5: when the temperature varies, can obtain central wavelength-photocurrent curve under the second state according to S1-S3, into
And obtain the central wavelength of the second fiber grating；
S6: finally, the central wavelength of the second fiber grating of the central wavelength and S5 of the first fiber grating of comparison S4, such as
Shown in Fig. 7, the changing value of the corresponding fiber bragg grating center wavelength of two curves, as temperature change fiber grating center can be obtained
The drift value of wavelength, and then can be according to the variable quantity of drift value you can get it temperature.
The central wavelength of fiber grating reflected light depends on the fringe spacing of grating, and fringe spacing is determined by temperature
, when ambient temperature variation, the fringe spacing of grating can change, and the central wavelength of fiber grating can move, Wo Menke
With the offset by Detection wavelength come the variation of temperature.Above method principle is simple and easy to accomplish, during realization
It is small in size without using F-P filter or F-P etalon etc. and at low cost.
In the above-described embodiments, after S3, fiber grating is accessed into demodulating system, is then returned with optical detector detection light grid
Return to the light intensity of optical detector.If the modulation range of laser is not covered with the central wavelength of fiber grating, optical detector is defeated
The case where photoelectric current out is almost equal to zero, as shown in figure 8, such the reason is that the modulation range due to laser does not cover optical fiber
The central wavelength of grating, therefore, in the present embodiment, before step S 4, as shown in Fig. 2, being additionally provided with S31: if laser
Modulation range is not covered with the central wavelength of fiber grating, and the photoelectric current of optical detector output is almost equal to zero, and adjusts laser
Modulation range, so that it is covered the central wavelength of fiber grating.
In the above-described embodiments, by the tunable laser wavelength detecting method, temperature can be measured in the first state
With the variable quantity under the second state, certainly, temperature can also be other physical parameters herein, that is to say, that be swashed by the tuning
Optical wavelength detection method can detect the physical parameters such as strain, pressure, displacement, liquid level, acceleration, gas content or bending.
In the above-described embodiments, by increasing driving current at equal intervals to obtain driving current-photoelectric current in S1 and S2
Curve and driving current-central wavelength curve, wherein this increase at equal intervals electric current can select with the interval of 0.1mA from 0mA increase
Greatly to 150mA, convenient for accurately measuring the variation of physical parameter to be detected to be detected.
Embodiment 2
The embodiment of the invention also provides a kind of detection device of tunable laser wavelength, which includes tunable
Semiconductor laser, drive circuit board, optical detector, optical fiber circulator and grating；The first port of optical fiber circulator with it is adjustable
The output end of humorous semiconductor laser is connected, and second port is connected with grating, and third port is connected with laser detector, driving electricity
Road plate can detect the variable quantity of physical parameter to be measured according to the detection method of the tunable laser wavelength in embodiment 1.
The tunable laser wavelength detecting device can be only by semiconductor laser with tunable, drive circuit board, optical detector
It is formed with optical fiber circulator, wherein drive circuit board can pass through tunable half according to the detection method of above-mentioned tunable laser wavelength
Conductor laser detector and optical fiber circulator measure physical parameter to be measured, the tunable laser wavelength detecting apparatus body
Product is smaller, easy to remove, easy to use, and the installation cost is lower.
In the above-described embodiments, can also in use of wavelength division multiplexing, therefore, which is additionally provided with multiplexer, together
When the quantity of optical detector is set as two or more, each optical detector series connection, and the output end of each optical detector with multiplexing
Device connection.A laser detector of connecting on an optical fiber can be achieved, by carrying out special package to different wave length grating, one
The real-time measurement of the physical parameters such as the multi-parameters such as temperature, strain can be achieved on root optical fiber.
In the above-described embodiments, which is additionally provided with shell, wherein semiconductor laser with tunable, driving circuit
Plate and optical fiber circulator are respectively positioned in shell, which can keep the cleaning inside of the detection device, and mention for internal each component
For protective effect.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ",
" thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time
The orientation or positional relationship of the instructions such as needle ", " counterclockwise ", " axial direction ", " radial direction ", " circumferential direction " be orientation based on the figure or
Positional relationship is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning must
There must be specific orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more, unless separately
There is clearly specific restriction.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (7)
1. a kind of detection method of tunable laser wavelength, which comprises the steps of:
S1: the luminous end of laser is connect with optical detector, inputted in the state of physics parameter constant to be measured to laser etc.
It is spaced the driving current increased, and records the photocurrent values that optical detector exports under each driving current, makes driving current-photoelectricity
Flow curve；
S2: keeping physics parameter constant to be measured and identical as the physical parameter to be measured in S1, increase the driving current at equal intervals,
And the spectrum of laser under each driving current and the central wavelength that writing laser is luminous are recorded, make the middle cardiac wave of driving current-
Long curve；
S3: driving current obtained in driving current-photocurrent curve and S2 according to obtained in S1-central wavelength curve obtains
Central wavelength-photocurrent curve；
S4: returning to the light intensity of optical detector with optical detector detection light grid, and is converted into electric current output, is obtained according to S1-S3
Central wavelength-photocurrent curve under first state, obtains the central wavelength of the first fiber grating；
S5: when the physical parameter to be measured changes, central wavelength-photoelectric current under the second state is obtained according to S1-S3
Curve obtains the central wavelength of the second fiber grating；
S6: the central wavelength of comparison first fiber grating and the central wavelength of second fiber grating, as determinand
The drift value for managing Parameters variation fiber bragg grating center wavelength, according to the variation of the drift value you can get it physical parameter to be measured
Amount.
2. the detection method of tunable laser wavelength according to claim 1, which is characterized in that before step S 4, also
Including step S31: if the modulation range of laser is not covered with the central wavelength of fiber grating, the photoelectricity of optical detector output
Stream is almost equal to zero, and the modulation range of laser is adjusted, it is made to cover the central wavelength of fiber grating.
3. the detection method of tunable laser wavelength according to claim 1 or 2, which is characterized in that physical parameter is temperature
Spend parameter, strain parameter, pressure parameter, displacement parameter, level parameter, acceleration parameter, gas content parameter or bending parameters.
4. the detection method of tunable laser wavelength according to claim 1 or 2, which is characterized in that increase drive at equal intervals
Streaming current value are as follows: 150mA is increased to from 0mA with the interval of 0.1mA.
5. a kind of detection device of tunable laser wavelength, which is characterized in that including semiconductor laser with tunable, driving circuit
Plate, optical detector, optical fiber circulator and grating；The first port of the optical fiber circulator and semiconductor laser with tunable it is defeated
Outlet is connected, and second port is connected with the grating, and third port is connected with the optical detector, and the drive circuit board can root
The variable quantity of physical parameter to be measured is detected according to the detection method of the described in any item tunable laser wavelength of claim 1-4.
6. the detection device of tunable laser wavelength according to claim 5, which is characterized in that it further include multiplexer, institute
The quantity for stating optical detector is multiple, each optical detector series connection, and the output end of each optical detector with it is described multiple
It is connected with device.
7. the detection device of tunable laser wavelength according to claim 5, which is characterized in that it further include shell, it is described
Semiconductor laser with tunable, the drive circuit board and the optical fiber circulator are respectively positioned in the shell.
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| CN101364023A (en) * | 2008-09-10 | 2009-02-11 | 山东大学 | Modulation and demodulation method of fiber grating and device thereof |
| CN201322624Y (en) * | 2008-11-27 | 2009-10-07 | 世纪晶源科技有限公司 | Fiber grating sensing device and circuit thereof |
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