CN203365320U - Wide range micro water measuring system based on programmable amplifier - Google Patents
Wide range micro water measuring system based on programmable amplifier Download PDFInfo
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- CN203365320U CN203365320U CN 201320436549 CN201320436549U CN203365320U CN 203365320 U CN203365320 U CN 203365320U CN 201320436549 CN201320436549 CN 201320436549 CN 201320436549 U CN201320436549 U CN 201320436549U CN 203365320 U CN203365320 U CN 203365320U
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Abstract
The utility model discloses a wide range micro water measuring system based on a programmable amplifier and belongs to the technical field of optical fiber micro water measurement. The wide range micro water measuring system comprises a central control circuit and the like, wherein the central control circuit is connected with a programmable amplification circuit, an analog-digital conversion module and a digital-analog conversion module respectively; the digital-analog conversion module is connected to a DFB laser; the DFB laser is connected to an optical fiber collimator; the optical fiber collimator is connected to a photoelectric converter; the photoelectric converter is connected to the programmable amplification circuit; the programmable amplification circuit is connected with the analog-digital conversion module. The data measured through the absorption spectroscopy is adopted to regulate wavy voltage range to the range that a processor can collect via the programmable amplification circuit, and when the concentration of measured gas is changed, the amplification time of the programmable amplification circuit is regulated, and the corresponding data fitting parameter is selected, so as to realize wide range measurement of vapour concentration. The wide range micro water measuring system, disclosed by the utility model, has the following advantages: micro water measurement is free from electromagnetic interference, the insulating property and the safety are excellent, and the programmable amplifier is adopted to realize wide range measurement of vapour concentration.
Description
Technical field
The utility model relates to a kind of gas detecting system, is specifically related to the system that programmable amplifier is realized micro-water content in robotization adjusting wide region measurement gas, belongs to the micro-water gaging technical field of optical fiber.
Background technology
In multiple gases, as air, rock gas and SF6 gas etc., all can contain a small amount of steam.In the time of in being applied to every profession and trade, in gas, the requirement of moisture content is just quite strict.
In gas-insulated switch (GIS) and ehv power transmission equipment, often use SF
6deng insulation and arc extinguishing gases.The height of its micro-water content directly has influence on reliability and the security of equipment, if the SF6 gas leak in equipment, in gas, liquid water content increases simultaneously, when in SF6 gas, micro-water content is elevated to finite concentration, the electric arc analyte of SF6 gas can be hydrolyzed the generation poisonous gas, to the equipment chemical corrosion, have a strong impact on the normal operation of equipment, will cause high voltage electric equipment potential safety hazard to occur or cause the generation of accident.
At first rock gas will carry out purified treatment in the process of transmission, and moisture is one of pollutant important in rock gas, all need the Real-Time Monitoring moisture in the purified treatment of rock gas and the stages of transmission, too much moisture can cause the formation of ducted hyrate and the corrosion of transport pipeline, may cause serious security incident and high outage cost, the quality and the calorific value that exceed standard and also can reduce rock gas of moisture.
Patent " a kind of micro-water detection system based on scanning method " [Shandong University, Chinese utility model patent, CN102226759A, 2011-10-26] and patent " a kind of intracavity gas detecting system and method for length scanning " [Shandong University, Chinese invention patent, CN101975752A, 2011-02-16] in mention and gather photodetector through amplifying and filtered signal data, be stored in computing machine; Yet, because the acquisition range of data collecting card is limited and photodetector can produce saturated phenomenon after reaching certain threshold value, the moisture content that causes this measuring method to be measured is limited in scope, and can't realize the variation of measurement range from the high concentration to the low concentration.
In the utility model, proposed a kind of based on the micro-water gaging system of programmable amplifier wide region.This system is by laser gas spectral absorption circuit, in conjunction with programmable amplifier, realize the wide region of moisture is detected the impact of minimizing test that can maximum possible on electrical equipment, the Real-time Obtaining data, ensure the normal operation of the electric equipment of UHV (ultra-high voltage) simultaneously.
Summary of the invention
The shortcomings and deficiencies that exist for overcoming prior art, the utility model proposes the micro-water gaging system of a kind of wide region based on programmable amplifier.
The technical solution adopted in the utility model is as follows:
The micro-water gaging system of a kind of wide region based on pga circuit, comprise central control circuit, D/A converter module, Distributed Feedback Laser, optical fiber collimator, photoelectric commutator, pga circuit and analog-to-digital conversion module, it is characterized in that central control circuit is connected to D/A converter module, the analog signal output of D/A converter module is connected to Distributed Feedback Laser, the output terminal of Distributed Feedback Laser is through its tail optical fiber incoming fiber optic collimating apparatus, the output terminal of optical fiber collimator is connected to the input end face of photoelectric commutator, the output terminal of photoelectric commutator is connected to the input end of pga circuit, the control end of pga circuit is connected with central control circuit, the input end of the output terminal access analog-to-digital conversion module of pga circuit, the output terminal of analog-to-digital conversion module is connected to central control circuit, and central control circuit is according to the enlargement factor of the signal magnitude feedback adjusting pga circuit collected,
Described pga circuit comprises integrated package U101, capacitor C 32, C33, C34, C35, C36, C37, C38, C39, C40 and resistance R 9, integrated package U101 model is AD8321, wherein resistance R 9 is connected with capacitor C 32, and to form be a low-pass filter, tie point is received the pin 2 of AD8321, the filtering that this low-pass filter carries out the clock that is input to pga circuit, the pin 1 of AD8321, pin 2 is through resistance R 9, pin 3, pin 6 is connected on the IO pin of central control circuit, realize the control of central control circuit to pga circuit, the normal phase input end of AD8321 is that pin 18 is connected to the ground by serial connection capacitor C 38, inverting input is that pin 19 is connected with the output terminal of prime photoelectric commutator, the output terminal of AD8321 is the input end that pin 10 is connected to analog-to-digital conversion module,
Described D/A converter module comprises analog-digital chip U11 and capacitor C 23, C24, chip U11 model is TLC5615, wherein capacitor C 23 is connected between the pin 5 and 8 of TLC5615 to realize the filtering to the U11 power supply, and capacitor C 24 is connected between the pin 5 and 6 of TLC5615 to realize the filtering of logarithmic mode modular converter reference voltage; The pin 1 of TLC5615 is connected with central control circuit, and pin 7 is connected with Distributed Feedback Laser;
Described analog-to-digital conversion module comprises modulus conversion chip U21 and resistance R 4, capacitor C 25, chip U21 model is MAX1287, wherein resistance R 4 is connected with capacitor C 25 and receives the power supply place of chip, the other end of resistance R 4 is received pin 1 place of MAX1287, the other end ground connection of capacitor C 25, be pin 4 places of MAX1287, the power supply of 25 couples of MAX1287 of capacitor C strobes; The pin 2 of MAX1287 is connected with pga circuit, and the pin 7 of MAX1287 is connected with central control circuit.
Described central control circuit is LPC1756 embedded type C ortex-M3 processor.
Described photoelectric commutator is the PIN photoelectric commutator.
A kind of method of utilizing above-mentioned measuring system to carry out the micro-water gaging of wide region, step is as follows:
1, central control circuit sends periodic modulation signal, drive Distributed Feedback Laser to send the laser of scanning wavelength with drive signal change, light signal after hydrone in gas in optical fiber collimator absorbs changes measurable voltage signal into by photoelectric commutator and treatment circuit, the analog-to-digital conversion module that central control circuit is controlled gathers voltage signal according to the cycle that drives modulation signal and sequential, after (500 times) are processed in multiple averaging, it being stored as to horizontal ordinate is the data point position, the array that ordinate is magnitude of voltage;
2, the maximal value in the magnitude of voltage gathered adjusting pga circuit: get step 1), judge that this magnitude of voltage is whether in the optimal acquisition scope of analog-to-digital conversion module, the enlargement factor that if it is keeps pga circuit, if not judging that this magnitude of voltage is whether lower than the minimum value of the optimal acquisition magnitude of voltage of analog-to-digital conversion module, if improve the enlargement factor of pga circuit lower than this minimum value, if higher than the maximal value of the optimal acquisition magnitude of voltage of analog-to-digital conversion module reduce the enlargement factor of pga circuit;
3, demarcate peak value and moisture content: the corresponding relation of demarcating peak value and micro-water content with the high precision microwater device, control the optical fiber collimator place identical with the micro-water content at high precision microwater device place, peak value and the actual micro-water content calibrated and calculated of measuring of measuring gone out to the coefficient of correspondence relation, specifically, use native system to keep temperature-resistant, take out the absolute peak data in array after multiple averaging, relation according to micro-water content C in gas with the peak voltage signal y collected, determine micro-water content in the gas that y is corresponding.
Measuring principle of the present utility model is as follows: the position of hydrone absorption intensity maximum is at 1367.862nm and two wavelength places of 1368.597nm.By Bill-lambert (Beer-Lambert) law, can be extrapolated, when the wavelength of incident laser overlaps with the hydrone absorbing wavelength, when incident laser passes through the gas of moisture molecule, the part luminous energy will be absorbed by the hydrone in gas to be measured, and output intensity will weaken.
According to Bill-Lambert law, in input, output intensity and gas, the pass of liquid water content is:
I (t)=I
0(t) exp (α (λ) CL), wherein, I
0(t) be input light light intensity, I (t) is output light light intensity, and α (λ) is absorption coefficient, and L is the length of light and gas effect, and C is gas concentration.After α (λ), L determine, the decay of light intensity is only relevant to C,
Because α (λ) CL value is very little, but so this formula approximate representation be
And then calculate liquid water content size, i.e. micro-water concentration.
For improving the degree of accuracy of voltage data, can improve the frequency of turntable driving modulation signal, take the method for multiple averaging, get representative value in the utility model 500 times, the impact brought by the decreased average noise.
When moisture content changes, output intensity will change thereupon, if this variation range is larger, will exceed the data acquisition scope of analog-to-digital conversion module, can't continue to measure moisture again; By the enlargement factor adjustment to pga circuit, the size that makes signal in the measurement range of analog-to-digital conversion module, is adjusted and is reduced enlargement factor all the time when signal is excessive, adjusts when signal gets too small and improves enlargement factor.
The utility model provides a kind of method of efficient, workable measurement micro-water content.On the basis of photoelectric commutator and treatment circuit, obtain the gas micro water content information needed.In gas-insulated switch (GIS) and ehv power transmission equipment, test instrumentation is fewer, on normal operation to affect possibility less.Data processing method in the utility model can maximum possible the minimizing test on the impact of electrical equipment, simultaneously can the Real-time Obtaining data, ensure the normal operation of the electric equipment of UHV (ultra-high voltage).
The accompanying drawing explanation
Fig. 1 is the utility model gas detecting system annexation block diagram.
In figure: the 1-central control circuit; The 2-D/A converter module; The 3-DFB laser instrument; The 4-optical fiber collimator; The 5-photoelectric commutator; The 6-pga circuit; The 7-analog-to-digital conversion module.
Fig. 2 is the pga circuit circuit diagram, pga circuit comprises integrated package U101, capacitor C 32, C33, C34, C35, C36, C37, C38, C39, C40 and resistance R 9, integrated package U101 model is AD8321, wherein resistance R 9 is connected with capacitor C 32, and to form be a low-pass filter, tie point is received the pin 2 of AD8321, the filtering that this low-pass filter carries out the clock that is input to pga circuit, the pin 1 of AD8321, pin 2 is through resistance R 9, pin 3, pin 6 is connected on the IO pin of central control circuit, realize the control of central control circuit to pga circuit, the normal phase input end of AD8321 is that pin 18 is connected to the ground by serial connection capacitor C 38, inverting input is that pin 19 is connected with the output terminal of prime photoelectric commutator, the output terminal of AD8321 is the input end that pin 10 is connected to analog-to-digital conversion module.
The circuit diagram that Fig. 3 is D/A converter module, D/A converter module comprises analog-digital chip U11 and capacitor C 23, C24, chip U11 model is TLC5615, wherein capacitor C 23 is connected between the pin 5 and 8 of TLC5615 to realize the filtering to the U11 power supply, and capacitor C 24 is connected between the pin 5 and 6 of TLC5615 to realize the filtering of logarithmic mode converter reference voltage; The pin 1 of TLC5615 is connected with central control circuit, and pin 7 is connected with Distributed Feedback Laser.
The circuit diagram that Fig. 4 is analog-to-digital conversion module, analog-to-digital conversion module comprises modulus conversion chip U21 and resistance R 4, capacitor C 25, chip U21 model is MAX1287, wherein resistance R 4 is connected with capacitor C 25 and receives the power supply place of chip, the other end of resistance R 4 is received pin 1 place of MAX1287, the other end ground connection of capacitor C 25, i.e. pin 4 places of MAX1287, the power supply of 25 couples of MAX1287 of capacitor C strobes; The pin 2 of MAX1287 is connected with pga circuit, and the pin 7 of MAX1287 is connected with central control circuit.
The corresponding curve of line style that Fig. 5 is timing signal relative peak height hydrone content, in figure, horizontal ordinate means the absolute peak of the signal that collects, and ordinate means moisture, and this curve means the absolute peak of signal and the linear corresponding relation of moisture.
Embodiment
Below in conjunction with drawings and Examples, the utility model is described in further detail, but be not limited to this.
Embodiment
The utility model embodiment as Figure 1-4, the micro-water gaging system of a kind of wide region based on pga circuit, comprise central control circuit 1, D/A converter module 2, Distributed Feedback Laser 3, optical fiber collimator 4, photoelectric commutator 5, pga circuit 6 and analog-to-digital conversion module 7, it is characterized in that central control circuit 1 is connected to D/A converter module 2, the analog signal output of D/A converter module 2 is connected to Distributed Feedback Laser 3, the output terminal of Distributed Feedback Laser 3 is through its tail optical fiber incoming fiber optic collimating apparatus 4, the output terminal of optical fiber collimator 4 is connected to the input end face of photoelectric commutator 5, the output terminal of photoelectric commutator 5 is connected to the input end of pga circuit 6, the control end of pga circuit 6 is connected with central control circuit 1, the input end of the output terminal access analog-to-digital conversion module 7 of pga circuit 6, the output terminal of analog-to-digital conversion module 7 is connected to central control circuit 1, and central control circuit 1 is according to the enlargement factor of the signal magnitude feedback adjusting pga circuit 6 collected,
Described pga circuit 6 comprises integrated package U101, capacitor C 32, C33, C34, C35, C36, C37, C38, C39, C40 and resistance R 9, integrated package U101 model is AD8321, wherein resistance R 9 is connected with capacitor C 32, and to form be a low-pass filter, tie point is received the pin 2 of AD8321, the filtering that this low-pass filter carries out the clock that is input to pga circuit, the pin 1 of AD8321, pin 2 is through resistance R 9, pin 3, pin 6 is connected on the IO pin of central control circuit, realize the control of 1 pair of pga circuit 6 of central control circuit, the normal phase input end of AD8321 is that pin 18 is connected to the ground by serial connection capacitor C 38, inverting input is that pin 19 is connected with the output terminal of prime photoelectric commutator, the output terminal of AD8321 is the input end that pin 10 is connected to analog-to-digital conversion module,
Described D/A converter module 2 comprises analog-digital chip U11 and capacitor C 23, C24, chip U11 model is TLC5615, wherein capacitor C 23 is connected between the pin 5 and 8 of TLC5615 to realize the filtering to the U11 power supply, and capacitor C 24 is connected between the pin 5 and 6 of TLC5615 to realize the filtering of logarithmic mode modular converter 2 reference voltages; The pin 1 of TLC5615 is connected with central control circuit 1, and pin 7 is connected with Distributed Feedback Laser 3;
Described analog-to-digital conversion module 7 comprises modulus conversion chip U21 and resistance R 4, capacitor C 25, chip U21 model is MAX1287, wherein resistance R 4 is connected with capacitor C 25 and receives the power supply place of chip, the other end of resistance R 4 is received pin 1 place of MAX1287, the other end ground connection of capacitor C 25, be pin 4 places of MAX1287, the power supply of 25 couples of MAX1287 of capacitor C strobes; The pin 2 of MAX1287 is connected with pga circuit 6, and the pin 7 of MAX1287 is connected with central control circuit 1.
Described central control circuit is LPC1756 embedded type C ortex-M3 processor.
Described photoelectric commutator is the PIN photoelectric commutator.
Claims (3)
1. the micro-water gaging system of the wide region based on pga circuit, comprise central control circuit, D/A converter module, Distributed Feedback Laser, optical fiber collimator, photoelectric commutator, pga circuit and analog-to-digital conversion module, it is characterized in that central control circuit is connected to D/A converter module, the analog signal output of D/A converter module is connected to Distributed Feedback Laser, the output terminal of Distributed Feedback Laser is through its tail optical fiber incoming fiber optic collimating apparatus, the output terminal of optical fiber collimator is connected to the input end face of photoelectric commutator, the output terminal of photoelectric commutator is connected to the input end of pga circuit, the control end of pga circuit is connected with central control circuit, the input end of the output terminal access analog-to-digital conversion module of pga circuit, the output terminal of analog-to-digital conversion module is connected to central control circuit, and central control circuit is according to the enlargement factor of the signal magnitude feedback adjusting pga circuit collected,
Described pga circuit comprises integrated package U101, capacitor C 32, C33, C34, C35, C36, C37, C38, C39, C40 and resistance R 9, integrated package U101 model is AD8321, wherein resistance R 9 is connected with capacitor C 32, and to form be a low-pass filter, tie point is received the pin 2 of AD8321, the filtering that this low-pass filter carries out the clock that is input to pga circuit, the pin 1 of AD8321, pin 2 is through resistance R 9, pin 3, pin 6 is connected on the IO pin of central control circuit, realize the control of central control circuit to pga circuit, the normal phase input end of AD8321 is that pin 18 is connected to the ground by serial connection capacitor C 38, inverting input is that pin 19 is connected with the output terminal of prime photoelectric commutator, the output terminal of AD8321 is the input end that pin 10 is connected to analog-to-digital conversion module,
Described D/A converter module comprises analog-digital chip U11 and capacitor C 23, C24, chip U11 model is TLC5615, wherein capacitor C 23 is connected between the pin 5 and 8 of TLC5615 to realize the filtering to the U11 power supply, and capacitor C 24 is connected between the pin 5 and 6 of TLC5615 to realize the filtering of logarithmic mode modular converter reference voltage; The pin 1 of TLC5615 is connected with central control circuit, and pin 7 is connected with Distributed Feedback Laser;
Described analog-to-digital conversion module comprises modulus conversion chip U21 and resistance R 4, capacitor C 25, chip U21 model is MAX1287, wherein resistance R 4 is connected with capacitor C 25 and receives the power supply place of chip, the other end of resistance R 4 is received pin 1 place of MAX1287, the other end ground connection of capacitor C 25, be pin 4 places of MAX1287, the power supply of 25 couples of MAX1287 of capacitor C strobes; The pin 2 of MAX1287 is connected with pga circuit, and the pin 7 of MAX1287 is connected with central control circuit.
2. the micro-water gaging system of a kind of wide region based on pga circuit as claimed in claim 1, is characterized in that described central control circuit is LPC1756 embedded type C ortex-M3 processor.
3. the micro-water gaging system of a kind of wide region based on pga circuit as claimed in claim 1, is characterized in that described photoelectric commutator is the PIN photoelectric commutator.
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| CN103411902A (en) * | 2013-07-22 | 2013-11-27 | 山东大学 | Wide-range micro-water measuring system based on programmable amplifier |
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| CN103411902A (en) * | 2013-07-22 | 2013-11-27 | 山东大学 | Wide-range micro-water measuring system based on programmable amplifier |
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Granted publication date: 20131225 Termination date: 20160722 |