CN102830079A - Micro-water content fiber laser detector based on secondary modulation and data stitching technology - Google Patents
Micro-water content fiber laser detector based on secondary modulation and data stitching technology Download PDFInfo
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- CN102830079A CN102830079A CN201110161324XA CN201110161324A CN102830079A CN 102830079 A CN102830079 A CN 102830079A CN 201110161324X A CN201110161324X A CN 201110161324XA CN 201110161324 A CN201110161324 A CN 201110161324A CN 102830079 A CN102830079 A CN 102830079A
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Abstract
The invention relates to a micro-water content fiber laser detector based on secondary modulation and data stitching technology. The fiber laser detector comprises a one-chip microcomputer, a laser, a first fiber coupler and a probe. A first laser output end of the firs fiber coupler is connected with the probe. A second laser output end of the first fiber coupler is connected with a second fiber coupler, a first laser output end of which is respectively connected with a first photoelectric detector and the one-chip microcomputer. A second laser output end of the second fiber coupler is respectively connected with a reference air chamber, a third photoelectric detector and the one-chip microcomputer. The probe comprises a fiber collimator assembly which is used to couple laser from the inside of fiber to gas and make laser return into fiber. A loop laser signal output end of the first fiber coupler is respectively connected with a second photoelectric detector and the one-chip microcomputer. The one-chip microcomputer is also connected with a temperature and pressure transmitter. The micro-water content fiber laser detector is not easily influenced by infrared radiation such as temperature and the like, is not subject to electromagnetic interference, has better insulating properties and security, and can be used to detect more accurately.
Description
Technical field
The present invention relates to a kind of checkout equipment, be specifically related to a kind of detector that is used for detecting the SF6 gas micro-water content of high voltage electric power equip ment.
Background technology
SF6 gas is widely used in gas-insulated switch (GIS) and the ehv power transmission equipment as insulation, arc-extinguishing medium because of its excellent insulation and arc extinction performance have obtained people's approval.Yet the interior SF6 gas of electric equipment can take place and cause SF6 gas density decline in the electric equipment to external leakage when long-time running in SF6 electric equipment inevitably, and micro-water content increases.When the liquid water content in the SF6 gas acquired a certain degree, under electric arc or corona effect, SF6 decomposing gas thing can produce chemical corrosion to equipment through hydrolysis reaction toxigenicity gas, has a strong impact on the normal operation of equipment then.Moisture in the gas generally exists with the water vapor form of gaseous state, when temperature reduces, with condensing into liquid dew attached to piece surface, possibly cause along the face insulation flashover to cause accident.
Therefore, the micro-water content in the SF6 gas is carried out monitoring in real time,, the safe and stable operation that guarantees equipment is had important effect to realize the reasonable control of moisture.
Though the development of detection technique in recent years; The detecting instrument of the SF6 gas micro-water content of transformer is also more and more; But wherein major part is based on the electrical type sensor of dew point; External also have through optics realize the report that micro-water content detects, the main still detection technique through infrared band realizes.Electronic product detects at power equipment; Particularly stop little water context of detection and receive electromagnetic interference (EMI) easily, also destroy existing equipment electromagnetic field state easily, reduce the insulating property and the security of equipment at SF6 insulation gas; Optical infra-red sensor is subject to the temperature field influence, produces rich detection error.The gas detection technology of laser scanning principle is because gas absorption width broadening under high pressure to such an extent as to simple current scanning is difficult to the blanketing gas absorption peak, therefore only limits to the detection under normal pressure or the infrabar.
Summary of the invention
The objective of the invention is to overcome deficiency of the prior art; A kind of micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill is provided, and this device is not subject to infrared radiation influences such as temperature, does not receive electromagnetic interference (EMI); Insulating property and security are better, and it is more accurate to detect.
The objective of the invention is to realize: a kind of micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill through following scheme; Comprise that successively the single-chip microcomputer that connects, the control that receives said single-chip microcomputer sends the laser instrument of laser, the laser of said laser instrument is divided into first fiber coupler of two-way and receives the probe of one road laser of said first fiber coupler; Said first fiber coupler be connected with another road laser of receiving said first fiber coupler and with this another road laser be divided into two-way second fiber coupler; Said second fiber coupler is connected with first photodetector that the road laser that receives said second fiber coupler also converts this one road laser into electric signal; The electrical signal of said first photodetector is connected with said single-chip microcomputer; Said second fiber coupler also is connected with the 3rd photodetector that another road laser that receives said second fiber coupler also converts this another road laser into electric signal through reference gas chamber, and the electrical signal of said the 3rd photodetector is connected with said single-chip microcomputer; Said probe comprises that being used for that laser is coupled to gas in the optical fiber makes laser return the optical fiber collimator group of optical fiber again; The loop laser signal output terminal of said first fiber coupler also is connected with second photodetector that is used for the loop laser signal of said first fiber coupler is converted into electric signal; The electrical signal of said second photodetector is connected with said single-chip microcomputer, and said single-chip microcomputer also is connected with temperature and pressure transmitter.
Said optical fiber collimator group comprises stainless-steel tube, optical fiber collimator and catoptron; The middle part of said stainless-steel tube has cavity; The sidewall of said stainless-steel tube is provided with the bleeder vent that connects with said cavity; Said optical fiber collimator, said catoptron are arranged at two ends of said cavity respectively, said optical fiber collimator over against with said catoptron.
Said single-chip microcomputer also is connected with the display panel that is used to show the micro-water content value.
Said single-chip microcomputer also is connected with the signal output port that is used to export the micro-water content value.
Said probe also comprise sensor base with the fastening block that is used for being connected with the SF6 gas tank; Said optical fiber collimator group is fixedly set in said sensor base; Said fastening block is fixedly connected on the side of said sensor base; The middle part of said fastening block has the optical fiber optical fiber hole, and said optical fiber collimator group has optical fiber, and said optical fiber stretches out from said optical fiber optical fiber hole.
Be sealed and matched through the glue that is sealing adhesive between said optical fiber and the said optical fiber optical fiber hole.
Said fastening block is provided with optical fiber protective tube corresponding to the extension of said optical fiber, and the extending area of said optical fiber is in said optical fiber protective tube.
Said fastening block is a right cylinder, and the external peripheral surface of said fastening block is provided with external thread, and the external peripheral surface of said fastening block also is provided with clamp nut corresponding to said external thread.
The invention has the advantages that: the present invention adopts the near infrared spectrum absorption techniques; Utilize laser instrument that little water is absorbed line and scan detection, utilize optical fiber to carry out luminous energy and the detection of signal transmission realization remote online, come correct detection errors through gaseous tension and Temperature Compensation; The present invention need not power supply; Do not receive electromagnetic interference (EMI), do not influence insulating gas Electric Field Distribution and insulation characterisitic, more reliable durable.Because the environment that electric power SF6 insulation gas micro-water content detects is high pressure (0.3Mpa-0.5MPa); Therefore; The gas absorption peak will be by broadening greatly, and the present invention modulates through temperature and electric current secondary, adds the data suturing skill; To increase absorption peak sweep limit and accuracy greatly, thereby more accurately detect micro-water content.
Description of drawings
Fig. 1 is the one-piece construction synoptic diagram of the micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill of the present invention;
Fig. 2 is next scan period inner laser device output center wavelength change curve of two kinds of temperature;
Fig. 3 is No. three detector picked up signal curve maps;
Fig. 4 is the sweep signal figure of output under the different micro-water contents;
Fig. 5 is a moisture absorption spectrum comparison diagram under the different temperatures;
Fig. 6 removes the structural representation of optical fiber collimator group for probe;
Fig. 7 is the lateral plan of Fig. 5;
Fig. 8 is the structural representation of optical fiber collimator group and sensor base fit system;
Fig. 9 is the lateral plan of Fig. 7;
Figure 10 is the structural representation of optical fiber collimator group.
In the drawings: the 1-probe; The 2-temperature and pressure transmitter; 3-first fiber coupler; The 4-laser instrument; 5-second photodetector; 6-first photodetector; The 7-single-chip microcomputer; The 8-display panel; The 9-SF6 airtight joint sealing that insulate; The 10-signal output port; 11-second fiber coupler; The 12-reference gas chamber; 13-the 3rd photodetector; The 14-catoptron; The 15-stainless-steel tube; The 16-bleeder vent; The 17-optical fiber collimator; 18-optical fiber; 19-optical fiber collimator group; The 20-sensor base; The 21-fastening block; The 22-clamp nut; 23-optical fiber optical fiber hole; The 24-optical fiber protective tube.
Embodiment
Below in conjunction with accompanying drawing the present invention is further specified.
As shown in Figure 1; A kind of micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill; The control that draw together successively the single-chip microcomputer 7 that connects, receives single-chip microcomputer 7 send laser laser instrument 4, the laser of laser instrument 4 is divided into first fiber coupler 3 of two-way and receives the probe 1 of one road laser of first fiber coupler 3; First fiber coupler 3 be connected with another road laser of receiving first fiber coupler 3 and with this another road laser be divided into two-way second fiber coupler 11; Second fiber coupler 11 is connected with first photodetector 6 that the road laser that receives second fiber coupler 11 also converts this one road laser into electric signal; The electrical signal of first photodetector 6 is connected with single-chip microcomputer 7; Second fiber coupler 11 also is connected with another road laser of receiving second fiber coupler 11 through reference gas chamber 12 and the electrical signal that this another road laser converts the 3rd photodetector 13, the three photodetectors 13 of electric signal into is connected with single-chip microcomputer 7; Probe 1 comprises that being used for that laser is coupled to gas in the optical fiber makes laser return the optical fiber collimator group 19 of optical fiber again; The loop laser signal output terminal of first fiber coupler 3 also is connected with second photodetector 5 that is used for the loop laser signal of first fiber coupler 3 is converted into electric signal; The electrical signal of second photodetector 5 is connected with single-chip microcomputer 7, and single-chip microcomputer 7 also is connected with temperature and pressure transmitter 2.
During work, will pop one's head in 1 is arranged at the SF6 airtight joint sealing 9 that insulate with temperature and pressure transmitter 2, and probe 1, temperature and pressure transmitter 2 all are sealed and matched with the SF6 airtight joint sealing 9 that insulate.The laser that single-chip microcomputer 7 control laser instruments 4 send is divided into two-way through first fiber coupler 3; One road laser gets into probe 1; Another road laser is divided into two-way once more by second fiber coupler 11; Second fiber coupler, 11 output ground first via laser enter into single-chip microcomputer 7 as normalized signal through first photodetector 6; The variation of power when this normalized signal is used for the normalization laser scans; Second fiber coupler, 11 output ground, the second road laser enters into the reference optical signal that single-chip microcomputer 7 is sewed up as data through reference gas chamber 12, the 3rd photodetector 13 successively; The tie point that this reference optical signal is used for data when sewing up is accurately located, and enters into single-chip microcomputer 7 as test signal through first fiber coupler 3, second photodetector 5 successively after laser is fully absorbed by SF6 gas through the effect of probe 1, is arranged at the insulate temperature and pressure transmitter 2 of airtight joint sealing 9 of SF6 compensating signal is passed to single-chip microcomputer 7; 7 pairs of normalized signals of single-chip microcomputer, reference signal, test signal are carried out computational analysis, again according to drawing the micro-water content value after the compensating signal compensation.
Single-chip microcomputer 7 control laser instruments 4 produce narrow-linewidth laser, and the centre wavelength of narrow-linewidth laser scans around the moisture absorption center, and is as shown in Figure 2; Single-chip microcomputer 7 is at first controlled laser instrument 4 and under first temperature conditions, is scanned the gas absorption peak, regulate laser instrument 4 then and under second temperature conditions, scan the gas absorption peak once more, twice scanning the wavelength region may of process different; Just can cover the bulk zone of both sides, water vapor absorption peak, be the centre wavelength of a scan period inner laser and the graph of a relation of gaseous absorption line among Fig. 2, and light areas is represented the absorption intensity of moisture under different wave length among the figure; Can find out obviously that absorption is stronger near 1364.7nm; Darker curve is the centre wavelength of system's output laser among the figure, and horizontal ordinate is the time, i.e. the center wavelength variation situation of laser under a scan period; Provided the scanning area under two kinds of temperature of Single-chip Controlling among the figure; Can find out that the scanning area under first temperature conditions is at 1564.85nm-1564.68nm, the sweep limit under second temperature conditions is at 1564.72nm-1564.55nm; Therefore, sweep limit can be regarded the large area scanning of 1564.55nm-1564.85nm as.
Fig. 4 has provided a comparison diagram under the little water concentration of difference, can obviously find out among the figure, and under the different micro-water contents, its signal absorption intensity is different, just can accomplish the detection of micro-water content in view of the above.Later signal is handled in normalization, has eliminated zig-zag, makes that the signal top of its generation is a straight line; As shown in Figure 4; Moisture free gas produces straight line, and the signal that contains moisture then produces an absorption dip near absorption peak, and the big more depression of moisture is dark more.
According to can know the gas molecule spectral analysis hydrone gas in infrared and near-infrared band eigen vibration-rotation spectrum band and general frequency vibration-rotation spectrum band are arranged; And a vibrational spectra splits into a plurality of rotational structure spectral lines again, and promptly vibrational band contains many meticulous spectral lines.Because the influences such as natural broadening, collision broadening and dopplerbroadening of spectrum do not have only a definite frequency for the meticulous spectral line of each bar, but be the center, press certain way continuous distribution in certain frequency range with a certain frequency.Therefore actual molecular spectrum line all is the spectral profile that certain width is arranged, rather than a line that does not have width and shape.
When light overlapped through gas and with the absorption line of hydrone in the gas to be measured, the part luminous energy will be by gas absorption to be measured, and output intensity will weaken, and satisfy Bill-lambert (Beer-Lambert) law.
According to Beer-Lambert law, the relation of output intensity and gas concentration to be measured is:
I(t)＝I
0(t)exp[-α(λ)LC]
Wherein, I (T) is an output light light intensity, I
0Be input light light intensity, a is absorption coefficient (relevant with wavelength), and L is the length (being the distance that light transmits in gas) of light and gas effect, and C is a gas concentration.After absorption coefficient, the light path of gas were confirmed, the decay of light intensity was just only relevant with gas concentration.The concentration expression formula that can obtain gas is:
just can extrapolate the content size of little water, promptly little water concentration according to this formula.
But find that when using this principle development the absorption of water characteristic spectral line is the influence that receives temperature and air pressure.As shown in Figure 5, when temperature not simultaneously, its absorption coefficient is also different, 113 degrees centigrade of absorption intensities down are merely 75.9% 13 degrees centigrade under, so huge deviation will occur in assorted time test result of different temperature bar; Gas pressure intensity also produces very large influence to detecting, and when air pressure increased, absorption line became fuzzy; This is to be reduced by distance between the fourth gas atom, and interacting to each other strengthens, and has influenced the cause of natural frequency; When gas pressure intensity is enough high; Become the absorption band that certain width is arranged, the absorption region of liquid and solid is quite wide, also is for this reason.Absorption spectra live width halfwidth degree can be as tens pm scopes shown in Figure 4 when 1 atmospheric pressure, but are increased to two atmospheric pressure even when higher, the absorption line width can arrive pm up to a hundred by broadening on the contrary when air pressure, and this has also directly produced tremendous influence to measurement.Most of at present gas sensor based on spectral absorption all is based on Beer law; Just correct when this law does not only receive influencing of neighboring molecule around it in the absorptive power territory of material molecule, very greatly when (pressure is big), intermolecular influencing each other can not be ignored in concentration; This moment, Beer law just was false; Therefore, the present invention has introduced pressure compensation and temperature compensation, thereby guarantees the accuracy of detection.
Though when the transformer SF6 of reality gas detection; Insulation gas tank body seals, and will keep certain pressure, but little water detection itself is to use for the leakage that detection case is stopped; Casing gas leakage can produce pressure and change, and spin manifold temperature is inconstant.Consider above influence factor, the present invention is introduced into temperature and pressure in the system especially and compensates, thereby has fundamentally eliminated the problem of ignoring in gas absorption principle and the spectral analysis technique, remedies the influence that working environment detects little water.
Shown in figure 10; In the present invention; Optical fiber collimator group 19 comprises stainless-steel tube 15, optical fiber collimator 17 and catoptron 14, and the middle part of stainless-steel tube 15 has cavity, and the sidewall of stainless-steel tube 15 is provided with the bleeder vent 16 that connects with cavity; Optical fiber collimator 17, catoptron 14 are arranged at two ends of cavity respectively, optical fiber collimator 17 over against with catoptron 14.Laser enters into optical fiber collimator 17 output region laser beam through optical fiber 18, through the mirror 14 former road reflections that are reflected behind one section space, at last by optical fiber 18 outputs.Ambient atmos keeps inside and outside moisture content to equate through the interior gas communication that keeps of bleeder vent 16 and steel pipe.
Laser instrument 4 adopts the dfb semiconductor laser instrument that has the optical fiber pigtail encapsulation.Single-chip microcomputer 7 also is connected with display panel 8 and output signal output port 10.Data are sewed up and the computational analysis of micro-water content information is all accomplished in single-chip microcomputer with extracting; After obtaining absorption information; By the compensation anti-release micro-water content information of single-chip microcomputer according to above theory and temperature and pressure; Show through display panel 8, outwards export the result, thereby realized the measurement of micro-water content through data transmission port 10.
Like Fig. 6-shown in Figure 9; The probe 1 also comprise sensor base 20 with the fastening block 21 that is used for being connected with the SF6 gas tank; Said optical fiber collimator group 19 is fixedly set in said sensor base 20, and said fastening block 21 is fixedly connected on the side of said sensor base 20, and the middle part of said fastening block 21 has optical fiber optical fiber hole 23; Said optical fiber collimator group 19 has optical fiber 18, and said optical fiber 18 stretches out from said optical fiber optical fiber hole 23.
Wherein, be sealed and matched through the glue that is sealing adhesive between optical fiber 18 and the optical fiber optical fiber hole 23, make between optical fiber 18 and the optical fiber optical fiber hole 23 to have good air-tightness.For the extension that makes optical fiber 18 is not fractureed, fastening block 21 is provided with optical fiber protective tube 24 corresponding to the extension of optical fiber 18, and the extending area of optical fiber 18 is in optical fiber protective tube 24.As shown in Figure 8, sensor base 20 is provided with semi-circular recesses, and optical fiber collimator group 19 is arranged in the semi-circular recesses, and optical fiber collimator group 19 is gluedd joint with semi-circular recesses.
Fastening block 21 is a right cylinder; The external peripheral surface of fastening block 21 is provided with external thread; The external peripheral surface of fastening block 21 also is provided with clamp nut 22 corresponding to external thread; Insulating through fastening block 21, clamp nut 22 and SF6 makes probe 1 be fixedly set in the SF6 airtight joint sealing 9 that insulate cooperating of airtight joint sealing 9, and pop one's head in 1 and SF6 insulate and be sealed and matched between the airtight joint sealing 9.
Employed optical fiber 18, fiber coupler, dfb semiconductor laser instrument, photodetector, optical fiber collimator 17 etc. are optical communication device commonly used among the present invention; Single-chip microcomputer 7, display panel 8 are electron device commonly used; Signal output port 10 designs according to the field control demand, can be RS485 interface, RS232 interface, USB etc.
Should be noted that at last; Above content is only in order to explain technical scheme of the present invention; But not to the restriction of protection domain of the present invention; The simple modification that those of ordinary skill in the art carries out technical scheme of the present invention perhaps is equal to replacement, does not all break away from the essence and the scope of technical scheme of the present invention.
Claims (8)
1. micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill; It is characterized in that: said micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill comprises that the single-chip microcomputer (7) that connects successively, the control that receives said single-chip microcomputer (7) sends the laser instrument (4) of laser, the laser of said laser instrument (4) is divided into first fiber coupler (3) of two-way and the probe (1) of one road laser of said first fiber coupler of reception (3); Said first fiber coupler (3) be connected with another road laser of receiving said first fiber coupler (3) and with this another road laser be divided into two-way second fiber coupler (11); Said second fiber coupler (11) is connected with first photodetector (6) that the road laser that receives said second fiber coupler (11) also converts this one road laser into electric signal; The electrical signal of said first photodetector (6) is connected with said single-chip microcomputer (7); Said second fiber coupler (11) also is connected with the 3rd photodetector (13) that another road laser that receives said second fiber coupler (11) also converts this another road laser into electric signal through reference gas chamber (12), and the electrical signal of said the 3rd photodetector (13) is connected with said single-chip microcomputer (7); Said probe (1) comprises that being used for that laser is coupled to gas in the optical fiber makes laser return the optical fiber collimator group (19) of optical fiber again; The loop laser signal output terminal of said first fiber coupler (3) also is connected with second photodetector (5) that is used for the loop laser signal of said first fiber coupler (3) is converted into electric signal; The electrical signal of said second photodetector (5) is connected with said single-chip microcomputer (7), and said single-chip microcomputer (7) also is connected with temperature and pressure transmitter (2).
2. according to the described micro-water content optical fiber laser detection instrument of claim 1 based on secondary modulation and data suturing skill; It is characterized in that: said optical fiber collimator group (19) comprises stainless-steel tube (15), optical fiber collimator (17) and catoptron (14); The middle part of said stainless-steel tube (15) has cavity; The sidewall of said stainless-steel tube (15) is provided with the bleeder vent (16) that connects with said cavity; Said optical fiber collimator (17), said catoptron (14) are arranged at two ends of said cavity respectively, said optical fiber collimator (17) over against with said catoptron (14).
3. according to the described micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill of claim 1, it is characterized in that: said single-chip microcomputer (7) also is connected with the display panel (8) that is used to show the micro-water content value.
4. according to the described micro-water content optical fiber laser detection instrument based on secondary modulation and data suturing skill of claim 1, it is characterized in that: said single-chip microcomputer (7) also is connected with the signal output port (10) that is used to export the micro-water content value.
5. according to any described micro-water content optical fiber laser detection instrument in the claim 1 to 4 based on secondary modulation and data suturing skill; It is characterized in that: said probe (1) also comprise sensor base (20) with the fastening block (21) that is used for being connected with the SF6 gas tank; Said optical fiber collimator group (19) is fixedly set in said sensor base (20); Said fastening block (21) is fixedly connected on the side of said sensor base (20); The middle part of said fastening block (21) has optical fiber optical fiber hole (23), and said optical fiber collimator group (19) has optical fiber (18), and said optical fiber (18) stretches out from said optical fiber optical fiber hole (23).
6. according to the described micro-water content optical fiber laser detection instrument of claim 5, it is characterized in that: be sealed and matched through the glue that is sealing adhesive between said optical fiber (18) and the said optical fiber optical fiber hole (23) based on secondary modulation and data suturing skill.
7. according to the described micro-water content optical fiber laser detection instrument of claim 5 based on secondary modulation and data suturing skill; It is characterized in that: said fastening block (21) is provided with optical fiber protective tube (24) corresponding to the extension of said optical fiber (18), and the extending area of said optical fiber (18) is in said optical fiber protective tube (24).
8. according to the described micro-water content optical fiber laser detection instrument of claim 5 based on secondary modulation and data suturing skill; It is characterized in that: said fastening block (21) is a right cylinder; The external peripheral surface of said fastening block (21) is provided with external thread, and the external peripheral surface of said fastening block (21) also is provided with clamp nut (22) corresponding to said external thread.
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| CN112285051A (en) * | 2020-10-20 | 2021-01-29 | 国网重庆市电力公司电力科学研究院 | Optical detection system |
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