CN105091924A - Automatic calibration circuit and calibration method for fiber grating demodulator F-P filter - Google Patents
Automatic calibration circuit and calibration method for fiber grating demodulator F-P filter Download PDFInfo
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- CN105091924A CN105091924A CN201510507159.7A CN201510507159A CN105091924A CN 105091924 A CN105091924 A CN 105091924A CN 201510507159 A CN201510507159 A CN 201510507159A CN 105091924 A CN105091924 A CN 105091924A
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Abstract
The invention discloses an automatic calibration circuit for a fiber grating demodulator F-P filter. A CPU controls the output voltage of a first DA converter to reach a starting voltage; the output voltage of a second DA converter serves as a reference voltage of a third DA converter; adjustable range of the output voltage of the third DA converter is realized by adjusting the output voltage of the second DA converter; and a voltage adder enables the starting voltage and a scanning voltage to be superposed, and then, through phase inversion of a voltage phase inverter, the voltage drives the F-P filter. The invention further discloses an automatic calibration method for the fiber grating demodulator F-P filter. The method is characterized by, in the operation process, calculating a center voltage V3 of the first peak and a center voltage V4 of the last peak of an etalon after each scanning measurement; and controlling the range V1-V2 of the output voltage Vo of the voltage adder to be from V3-1.5 V to V4+1.5 V. The method can determine the voltage scanning range of the F-P filter automatically, thereby saving time and labor.
Description
Technical field
The present invention relates to a kind of automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter, also relate to a kind of automatic calibration method of fiber Bragg grating (FBG) demodulator F-P wave filter, belong to technical field.
Background technology
Fibre Optical Sensor is as new generation sensor, many physical quantitys, chemical quantity and biomass can be measured with high resolving power, can realize the non-electrometric measurement in scene, the security measurement problem in this inflammable and explosive, strong-electromagnetic field place just inherently solving that traditional electrical sensor is difficult to set foot in; Can facilitate, accurately with effectively to the detection of Physics amount, chemical quantity and biomass in the especially various rugged surroundings of various environment.Optical fiber information capacity is large in addition, an optical fiber can be prepared multiple even hundreds of sensing points, can carry out time division multiplex, wavelength-division multiplex, realize distributed measurement and networked control; Optical fiber volume is little, delicate, is specially adapted to the detection that some have narrow labyrinth space; And it is inner to imbed material, structural member and job facilities, realizes their state self diagnosis and do not damage its structure at its duration of work.
Have a lot of way to the demodulation of fiber grating sensing signal, as compound interference demodulation method, passive wavelength ratio demodulation method, wavelength-division multiplex optical fiber coupler demodulation method, locked mode demodulation method, based on F-P filters demodulate method, non-equilibrium scanning Mishelson interferometer demodulation method etc.
The design proposal of fiber Bragg grating (FBG) demodulator the most frequently used is at present based on F-P filters demodulate method, and the chamber changing F-P cavity due to F-P wave filter employing PZT is long, and therefore F-P wave filter has creep properties and returns the features such as stickiness.Return stickiness, when referring to that driving voltage increases and declines, output wavelength can correspondingly reduce and increase, but curve when reducing and curve when increasing can not overlap; Creep properties, refer to driving voltage raise or reduce process in, the repeatability of output wavelength is bad.Therefore the driving voltage waveform of F-P wave filter must be periodic.In addition, the output waveform of F-P wave filter also can by the impact of environment temperature.Fiber Bragg grating (FBG) demodulator is under low temperature and hot environment, and output waveform has a very large change.In circuit design, should pay attention to the impact of temperature on F-P wave filter, adjustment voltage carrys out compensation temperature.
Due to the above feature of F-P wave filter, make based on F-P wave filter fiber Bragg grating (FBG) demodulator scheduling and planning extremely inconvenient, mainly comprise following 2 points:
(1) scanning voltage needs manual shift
Do not fix because each F-P wave filter corresponds to the scanning voltage scope of wavelength between 1525 ~ 1565nm, the drive voltage range for F-P wave filter all uses the way of manual shift at present, and manual shift extremely wastes time and energy.
(2) F-P wave filter temperature influence is larger
At different temperatures, each F-P wave filter corresponds to the scanning voltage scope of wavelength between 1525 ~ 1565nm and does not fix, need respectively under high/low temperature in the scanning voltage scope of the F-P wave filter determined, get the union of scanning voltage scope under high/low temperature, such could meet high temperature under can normally measure, significantly can reduce the resolution of measurement like this, and whole calibration process at substantial manpower.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter is provided, automatically can determine the voltage scan range of F-P wave filter, effectively eliminate the temperature characterisitic of F-P wave filter to the impact of measuring.
For achieving the above object, the technical scheme that the automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter provided by the invention adopts is: the automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter, comprise starting point potential circuit, scanning voltage circuit, voltage adder circuit and voltage inverter
Described starting point potential circuit comprises: the first D/A converter be connected with CPU and the first modulate circuit being connected to the first D/A converter output terminal;
Described scanning voltage circuit comprises: for control F-P filter scan voltage range the 3rd D/A converter, for providing the second D/A converter of reference voltage for the 3rd D/A converter and being connected to the second modulate circuit of the 3rd D/A converter output terminal, the second D/A converter is also connected with described CPU;
Described first modulate circuit is connected with the input end of voltage adder circuit respectively with the second modulate circuit, the output terminal of described voltage adder is divided into two branch roads, wherein a branch road is connected with F-P wave filter, and another branch road is connected with F-P wave filter through described voltage inverter;
The output voltage that CPU controls the first D/A converter has reached point voltage; The output voltage of the second D/A converter is as the reference voltage of the 3rd D/A converter, adjustable by regulating the output voltage of the second D/A converter to realize the output voltage range of the 3rd D/A converter, voltage adder will play the scanning voltage superposition playing point voltage and the output of scanning voltage circuit of dot circuit output, output voltage Vo, again through the anti-phase output of voltage inverter-Vo, both superpose and drive F-P wave filter.
Present invention also offers a kind of automatic calibration method of fiber Bragg grating (FBG) demodulator F-P wave filter, comprise the steps:
Step one: initialization: arrange: the output voltage of the first D/A converter is 0V, the output voltage Vo scope V1 ~ V2 of voltage adder circuit is 0V ~ 6V;
Step 2: scanning voltage Lookup protocol: scanning voltage circuit scans F-P wave filter and measures the output waveform of etalon, calculate etalon wavelengths centered, carry out crest Spot detection: if crest center do not detected, then CPU controls the output voltage of the first D/A converter, make the output voltage Vo scope V1 ~ V2 of voltage adder circuit increase 1V, re-start scanning survey; If crest center detected, then set first crest center corresponding voltage as V3, make V1=V3-1.5V, V2=V2+2V, again carry out scanning survey, produce until no longer include new crest;
Calculate last crest center voltage V4 of etalon, by controlling the first D/A converter, the V1 ~ V2 of output voltage Vo scope that the second D/A converter makes voltage adder is V3-1.5V ~ V4+1.5V, and this parameter preserved, thus complete the Lookup protocol of scanning voltage;
Step 3: operational process automatic fine tuning:
Fiber Bragg grating (FBG) demodulator is in operational process, after each scanning survey, calculate the center voltage V3 of first crest of etalon and the center voltage V4 of last crest, by controlling the first D/A converter, the V1 ~ V2 of output voltage Vo scope that the second D/A converter makes voltage adder is V3-1.5V ~ V4+1.5V.
Compared with prior art, the beneficial effect that the present invention reaches is:
1, the Lookup protocol to F-P filter scan voltage is achieved, time saving and energy saving and there is higher resolution;
2, during work, dynamic adjustments F-P filter scan voltage, eliminates the creep properties of F-P wave filter, time stickiness and temperature characterisitic to the impact of measuring, ensures system worked well.
The present invention can be widely used in and be widely used for the large scale structure monitoring field such as (dam, bridge, building etc.), electric power, water conservancy, oil, chemical industry, metallurgy, nuclear industry, defence and military, the severe place application that especially cannot be able to use at many traditional sensors such as high voltage, strong electromagnetic.
Accompanying drawing explanation
Fig. 1 is the theory diagram of the automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter.
Fig. 2 is the process flow diagram of the automatic calibration method of fiber Bragg grating (FBG) demodulator F-P wave filter.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, the automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter, comprises starting point potential circuit, scanning voltage circuit, voltage adder circuit and voltage inverter.
Starting point potential circuit comprises: the first D/A converter be connected with CPU and the first modulate circuit being connected to the first D/A converter output terminal.
Scanning voltage circuit comprises: for control F-P filter scan voltage range the 3rd D/A converter, for providing the second D/A converter of reference voltage for the 3rd D/A converter and being connected to the second modulate circuit of the 3rd D/A converter output terminal, the second D/A converter is also connected with CPU.
First modulate circuit is connected with the input end of voltage adder circuit respectively with the second modulate circuit, and the output terminal of voltage adder is divided into two branch roads, and wherein a branch road is connected with F-P wave filter, and another branch road is connected with F-P wave filter through voltage inverter.
The output voltage that CPU controls the first D/A converter has reached point voltage; The output voltage of the second D/A converter is as the reference voltage of the 3rd D/A converter, adjustable by regulating the output voltage of the second D/A converter to realize the output voltage range of the 3rd D/A converter, voltage adder will play the scanning voltage superposition playing point voltage and the output of scanning voltage circuit of dot circuit output, output voltage Vo, again through the anti-phase output of voltage inverter-Vo, both superpose and drive F-P wave filter.
As shown in Figure 2, be the automatic calibration method of fiber Bragg grating (FBG) demodulator F-P wave filter provided by the invention, the method adopts above-mentioned automatic Calibration circuit, and it comprises the steps:
Step one: initialization: arrange: the output voltage of the first D/A converter is 0V, the output voltage Vo scope V1 ~ V2 of voltage adder circuit is 0V ~ 6V;
Step 2: scanning voltage Lookup protocol: scanning voltage circuit scans F-P wave filter and measures the output waveform of etalon, calculate etalon wavelengths centered, carry out crest Spot detection: if crest center do not detected, then CPU controls the output voltage of the first D/A converter, make the output voltage Vo scope V1 ~ V2 of voltage adder circuit increase 1V, re-start scanning survey; If crest center detected, then set first crest center corresponding voltage as V3, make V1=V3-1.5V, V2=V2+2V, again carry out scanning survey, produce until no longer include new crest;
Calculate last crest center voltage V4 of etalon, by controlling the first D/A converter, the V1 ~ V2 of output voltage Vo scope that the second D/A converter makes voltage adder is V3-1.5V ~ V4+1.5V, and this parameter preserved, thus complete the Lookup protocol of scanning voltage;
Step 3: operational process automatic fine tuning:
Fiber Bragg grating (FBG) demodulator is in operational process, due to F-P wave filter, there is creep properties and return the feature of stickiness, the change of integrated environment temperature again, be applied to certain skew that waveform corresponding to the driving scanning voltage of F-P wave filter occurs, along with the accumulation of time, skew can increase always, fiber Bragg grating (FBG) demodulator finally may be caused cannot to carry out wavelength resolve, for eliminating the accumulative effect of waveform skew, after each scanning survey, calculate the center voltage V3 of first crest and the center voltage V4 of last crest of etalon, by controlling the first D/A converter, second D/A converter makes the V1 ~ V2 of the output voltage Vo scope of voltage adder be V3-1.5V ~ V4+1.5V, can ensure that each effectively waveform is all in the center of sweep limit like this, thus eliminate the skew of F-P filter scan waveform, overcome the impact of environment temperature on it.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (2)
1. the automatic Calibration circuit of fiber Bragg grating (FBG) demodulator F-P wave filter, is characterized in that, comprises starting point potential circuit, scanning voltage circuit, voltage adder circuit and voltage inverter,
Described starting point potential circuit comprises: the first D/A converter be connected with CPU and the first modulate circuit being connected to the first D/A converter output terminal;
Described scanning voltage circuit comprises: for control F-P filter scan voltage range the 3rd D/A converter, for providing the second D/A converter of reference voltage for the 3rd D/A converter and being connected to the second modulate circuit of the 3rd D/A converter output terminal, the second D/A converter is also connected with described CPU;
Described first modulate circuit is connected with the input end of voltage adder circuit respectively with the second modulate circuit, the output terminal of described voltage adder is divided into two branch roads, wherein a branch road is connected with F-P wave filter, and another branch road is connected with F-P wave filter through described voltage inverter;
The output voltage that CPU controls the first D/A converter has reached point voltage; The output voltage of the second D/A converter is as the reference voltage of the 3rd D/A converter, adjustable by regulating the output voltage of the second D/A converter to realize the output voltage range of the 3rd D/A converter, voltage adder will play the scanning voltage superposition playing point voltage and the output of scanning voltage circuit of dot circuit output, output voltage Vo, again through the anti-phase output of voltage inverter-Vo, both superpose and drive F-P wave filter.
2. the automatic calibration method of fiber Bragg grating (FBG) demodulator F-P wave filter, is characterized in that, comprises the steps:
Step one: initialization: the output voltage arranging first D/A converter is 0V, the output voltage Vo scope V1 ~ V2 of voltage adder circuit is 0V ~ 6V;
Step 2: scanning voltage Lookup protocol: scanning voltage circuit scans F-P wave filter and measures etalon output waveform, calculate etalon wavelengths centered, carry out crest Spot detection: if crest center do not detected, then CPU controls the output voltage of the first D/A converter, make the output voltage Vo scope V1 ~ V2 of voltage adder circuit increase 1V, re-start scanning survey; If crest center detected, then set first crest center corresponding voltage as V3, make V1=V3-1.5V, V2=V2+2V, again carry out scanning survey, produce until no longer include new crest;
Calculate last crest center voltage V4 of etalon, by controlling the first D/A converter, the V1 ~ V2 of output voltage Vo scope that the second D/A converter makes voltage adder is V3-1.5V ~ V4+1.5V, and this parameter preserved, thus complete the Lookup protocol of scanning voltage;
Step 3: operational process automatic fine tuning:
Fiber Bragg grating (FBG) demodulator F-P wave filter is in operational process, after each scanning survey, calculate the center voltage V3 of first crest of etalon and the center voltage V4 of last crest, by controlling the first D/A converter, the V1 ~ V2 of output voltage Vo scope that the second D/A converter makes voltage adder is V3-1.5V ~ V4+1.5V.
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| CN110567609A (en) * | 2019-10-21 | 2019-12-13 | 长江师范学院 | Fiber bragg grating sensing temperature measurement method for transformer winding |
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Address after: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210000 Co-patentee after: STATE GRID WUHAN HIGH VOLTAGE Research Institute Patentee after: NARI Group Corp. Address before: Nan Shui Road Gulou District of Nanjing city of Jiangsu Province, No. 8 210000 Co-patentee before: STATE GRID WUHAN HIGH VOLTAGE Research Institute Patentee before: NARI Group CORPORATION STATE GRID ELECTRIC POWER INSTITUTE |