CN104458144A - Laser leakage detecting system and method for positioning leakage gas of laser leakage detecting system - Google Patents
Laser leakage detecting system and method for positioning leakage gas of laser leakage detecting system Download PDFInfo
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- CN104458144A CN104458144A CN201410738495.8A CN201410738495A CN104458144A CN 104458144 A CN104458144 A CN 104458144A CN 201410738495 A CN201410738495 A CN 201410738495A CN 104458144 A CN104458144 A CN 104458144A
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Abstract
The invention discloses a laser leakage detecting system and a method for positioning leakage gas of the laser leakage detecting system, and belongs to the technical field of detecting. A spatial coordinate system xyz is established in space, the point o is the original point of the spatial coordinate system, and a laser sensor system is arranged in the spatial coordinate system xyz. The sensor system comprises laser sensors. The line ox is provided with the point o, the point x1L, the point x2L, the point x3L,..., the point xNL, the distance between every two adjacent points is equal and is represented as L larger than 0, and the laser sensors are installed on the points respectively. The line oy is provided with the point o, the point y1L, the point y2L, the point y3L,..., the point yNL, the distance between every two adjacent points is equal and is represented as L larger than 0, and the laser sensors are installed on the points respectively. The point o is the intersection point of the center line ox of one row of sensors and the center line oy of the other row of sensors, and the sensor on the point o is the mutual sensor of the center line ox and the center line oy.
Description
Technical field
The present invention relates to a kind of laser leakage detecting system and locating leaks gas methods thereof, belong to detection technique field.
Background technology
Methane is a kind of inflammable gas, be petrochemical industry refining production of units and civil area in major product and fuel, when content in air is more than 5.3%, very easily blast, so methane is again a kind of flammable explosive gas, methane blast can bring heavy losses to national economy and people's property safety, so CH_4 detection is an important topic.The CH_4 detection method of current use mainly contains: vapor-phase chromatography, electrochemical process, Production by Catalytic Combustion Process, metal oxide semiconductor sensor mensuration, optical interferometry, infrared absorption method.Above-mentioned several method exists needs dedicated technician, Operation and Maintenance difficulty, it is densely covered, intricate that the problems such as detection sensitivity is low, poor real, instrument and equipment volume is large, the life-span is low are not all suitable for petrochemical industry unit pipeline, and personnel patrol and examine the feature with placement devices difficulty.。
Summary of the invention
In order to overcome above-mentioned deficiency, the object of the present invention is to provide a kind of laser leakage detecting system.
The technical scheme that the present invention takes is as follows:
A kind of laser leakage detecting system, comprise some sensing systems, set up space coordinates xyz in space, o point is the initial point of space coordinates; Have laser sensor system in space coordinates xyz, sensing system comprises laser sensor; Ox have some o, an x
1L, x
2L, x
3L..., x
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; Oy have some o, a y
1L, y
2L, y
3L..., y
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; O point is the intersection point of center line ox and the oy of two row's sensors, the upper total sensor of line ox and oy centered by the sensor on o point; Oz have some o, an o
1H, o
2H..., o
eH, the spacing of two adjacent points is equal and be H, H > 0, and each point lays sensor; Through o
1H, o
2H..., o
eHpoint and upper total E the straight line parallel with ox of vertical oz, the individual straight line parallel with ox of E is central through o
1Hstraight line on there is an o
1H, x
1LH, x
2LH, x
3LH..., x
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line there is an o
2H, x
1L2H, x
2L2H, x
3L2H..., x
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, x
1LEH, x
2LEH, x
3LEH..., x
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
1H, o
2H..., o
eHput and vertical center line z have the individual straight line parallel with oy of E, in the individual straight line parallel with oy of this E, through o
1Hstraight line there is an o
1H, y
1LH, y
2LH, y
3LH..., y
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line on there is an o
2H, y
1L2H, y
2L2H, y
3L2H..., y
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, y
1LEH, y
2LEH, y
3LEH..., y
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through an x
nL, x
nLH, x
nL2H..., x
nLEHthere is E+1 straight line parallel to each other and be parallel to yoz plane, on E+1 straight line, each straight line having N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point x
nL, x
nLH, x
nL2H..., x
nLEHstart to place; Through a y
nL, y
nLH, y
nL2H..., y
nLEHthere is E+1 straight line parallel to each other and be parallel to xoz plane; On E+1 straight line, each straight line have N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point y
nL, y
nLH, y
nL2H..., y
nLEHstart to place.
A kind of laser leakage detecting system locating leaks gas methods, laser sensor system comprises laser sensor and laser pickoff, and laser sensor is fixedly laid, the laser rays that laser sensor sends all with the plane orthogonal at place; The light of the laser sensor that xoz face is installed is perpendicular to xoz face, and light is launched to oy direction; The light of the laser sensor that yoz face is installed is perpendicular to yoz face, and light is launched to ox direction; The light directive that laser sensor on oz line sends is to angular direction, and the light that the laser sensor on oz line sends is parallel to each other; The light that the laser sensor of xoz plane sends all is received by the laser pickoff on opposite; The light that the laser sensor of yoz plane sends all is received by the laser pickoff on opposite, and the light that the laser sensor on oz line sends all is received by the laser pickoff on straight line; If laser pickoff receives generating laser x
rLnHand y
kLnHabnormal signal, just can judge laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, so just can judge: Leakage Gas position as (rL, kL, nH), 1≤r≤N, 1≤k≤N, 1≤n≤E, x
0=y
0=o, the light that the laser sensor on the oz line that the laser pickoff on straight line receives sends occurs abnormal, just can judge its place general height.
A kind of laser leakage detecting system locating leaks gas methods, laser sensor system comprises laser sensor, and laser instrument slightly retouches formula for sweeping, and determines that the location method of gas leakage point is: if at laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, Leakage Gas position is (x, y, z),
Wherein,
x＝x
rLnH＝(y
kL-x
rL×tanθ
D)/(tanθ
B-tanθ
D),
y＝y
kLnH＝(x
rL×tanθ
D×tanθ
B-y
kL×tanθ
D)/(tanθ
B-tanθ
D)，
z＝nH。
The principle of the invention and beneficial effect: the gas leakage pipeline that will detect or reveal object and be placed on the space that regulation specifies and set up xyz coordinate system; x
rLnHwith y
kLnHrepresent position rL and ordinate (y-axis) the position kL of horizontal ordinate (x-axis) respectively, also represent the position nH of z-axis coordinate simultaneously; The coordinate numbering that laser sensor on each point is corresponding respectively, such as, put o
2H, x
1L2H, x
2L2H, x
3L2H..., x
nL2Hon laser sensor numbering be respectively o
2H, x
1L2H, x
2L2H, x
3L2H..., x
nL2H; The laser pickoff on the opposite that these laser sensors are corresponding also does same numbering, the signal of its corresponding laser sensor that such laser pickoff receives; The optical maser wavelength that the laser sensor of laser sensor system is launched is a sweep limit centered by detected gas absorbing wavelength, and for methane adsorption wavelength 1653.72nm, then the laser scanning wavelength that laser instrument is launched is 1653.72 ± 5nm.Whether tunable diode laser absorption spectroscopy technology relies on methane to measure the laser spectrum principle of absorption of specific wavelength and reveals and reveal concentration and have broad prospect of application.
Accompanying drawing explanation
Fig. 1 is structure diagram of the present invention.
Fig. 2 is the schematic diagram of first embodiment of the present invention.
Fig. 3 is the schematic diagram of second embodiment of the present invention.
In figure: 1. straight line.
Embodiment
Below in conjunction with accompanying drawing, the present invention will be further described:
As shown in Figure 1: a kind of laser leakage detecting system, comprises some sensing systems, set up space coordinates xyz in space, o point is the initial point of space coordinates; Have laser sensor system in space coordinates xyz, sensing system comprises laser sensor; Ox have some o, an x
1L, x
2L, x
3L..., x
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; Oy have some o, a y
1L, y
2L, y
3L..., y
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; O point is the intersection point of center line ox and the oy of two row's sensors, the upper total sensor of line ox and oy centered by the sensor on o point; Oz have some o, an o
1H, o
2H..., o
eH, the spacing of two adjacent points is equal and be H, H > 0, and each point lays sensor; Through o
1H, o
2H..., o
eHpoint and upper total E the straight line parallel with ox of vertical oz, the individual straight line parallel with ox of E is central through o
1Hstraight line on there is an o
1H, x
1LH, x
2LH, x
3LH..., x
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line there is an o
2H, x
1L2H, x
2L2H, x
3L2H..., x
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, x
1LEH, x
2LEH, x
3LEH..., x
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
1H, o
2H..., o
eHput and vertical center line z have the individual straight line parallel with oy of E, in the individual straight line parallel with oy of this E, through o
1Hstraight line there is an o
1H, y
1LH, y
2LH, y
3LH..., y
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line on there is an o
2H, y
1L2H, y
2L2H, y
3L2H..., y
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, y
1LEH, y
2LEH, y
3LEH..., y
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through an x
nL, x
nLH, x
nL2H..., x
nLEHthere is E+1 straight line parallel to each other and be parallel to yoz plane, on E+1 straight line, each straight line having N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point x
nL, x
nLH, x
nL2H..., x
nLEHstart to place; Through a y
nL, y
nLH, y
nL2H..., y
nLEHthere is E+1 straight line parallel to each other and be parallel to xoz plane; On E+1 straight line, each straight line have N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point y
nL, y
nLH, y
nL2H..., y
nLEHstart to place.Laser sensor and laser pickoff all do not draw in FIG.
A kind of laser leakage detecting system locating leaks gas methods: as shown in Figure 2: laser sensor system comprises laser sensor and laser pickoff, and laser sensor is fixedly laid, the laser rays that laser sensor sends all with the plane orthogonal at place; The light of the laser sensor that xoz face is installed is perpendicular to xoz face, and light is launched to oy direction; The light of the laser sensor that yoz face is installed is perpendicular to yoz face, and light is launched to ox direction; The light directive that laser sensor on oz line sends is to angular direction, and the light that the laser sensor on oz line sends is parallel to each other; The light that the laser sensor of xoz plane sends all is received by the laser pickoff on opposite; The light that the laser sensor of yoz plane sends all is received by the laser pickoff on opposite, and the light that the laser sensor on oz line sends all is received by the laser pickoff on straight line (1); If laser pickoff receives generating laser x
7L2Hand y
4L2Habnormal signal, just can judge laser rays x
7L2Hwith y
4L2Hpoint of intersection unusual circumstance, so just can judge: Leakage Gas position is as (7L, 4L, 2H); By that analogy, if laser pickoff receives generating laser x
rLnHand y
kLnHabnormal signal, just can judge laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, so just can judge: Leakage Gas position as (rL, kL, nH), 1≤r≤N, 1≤k≤N, 1≤n≤E, x
0=y
0=o, the light that the laser sensor on the oz line that the laser pickoff on straight line (1) receives sends occurs abnormal, just can judge its place general height, and can locate more fast in conjunction with the above-mentioned Leakage Gas position determined.
A kind of laser leakage detecting system locating leaks gas methods: as shown in Figure 3: laser sensor system comprises laser sensor, laser instrument slightly retouches formula for sweeping, and determines that the location method of gas leakage point is: if at laser rays x
7L2Hwith y
4L2Hpoint of intersection unusual circumstance, Leakage Gas position is (x, y, z);
Wherein,
x＝x
7L2H＝(y
4L-x
7L×tanθ
D)/(tanθ
B-tanθ
D),
y＝y
4L2H＝(x
7L×tanθ
D×tanθ
B-y
4L×tanθ
D)/(tanθ
B-tanθ
D),
z＝2H。
By that analogy, if at laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, Leakage Gas position is (x, y, z); Wherein,
x＝x
rLnH＝(y
kL-x
rL×tanθ
D)/(tanθ
B-tanθ
D),
y＝y
kLnH＝(x
rL×tanθ
D×tanθ
B-y
kL×tanθ
D)/(tanθ
B-tanθ
D)，
z＝nH。
In laser sensing system, Laser emission part has signal madulation module, can produce modulation signal, modulated laser wavelength, makes single laser frequency after ovennodulation, become a scanning band.The Lights section of laser instrument have selected that THORLABS company produces, and centre wavelength is the tail optical fiber Output of laser diode of 1650nm, and model is FPL1059P.The ITC4001 type that the present invention selects THORLABS company to produce desk-top laser diode/TEC (thermoelectric (al) cooler) controller, is used for controlling laser works and is stabilized within the scope of the scanning wavelength of restriction.Photodetector selected by system is that detector (PDA10DT-EC) amplifies in Thorlabs company InGaAs (InGaAsP), PDA10DT-EC is a kind of thermoelectric-cooled photoconductive detector, and it is responsive from the light wave of 0.9 to 2.57 microns to middle infrared spectrum wave band.Two rotary switches are used for built-in-gain amplifier and low pass bandwidth filter, and gain switch has 8 discrete gears between 0-70 decibel, and lower passband wide switch then provides 8 discrete gears between 500 hertz of-1 megahertz.Thermoelectric (al) cooler (TEC) adopts the temperature of a thermistor feedback circuit to detector element to control at-10 DEG C, thus the impact of thermal distortion on output signal is minimized.The signal that photodetector exports carries out signals collecting, after filtering with after amplification as the raw data of system algorithm.
Claims (4)
1. a laser leakage detecting system, comprises some sensing systems, sets up space coordinates xyz in space, and o point is the initial point of space coordinates, and it is characterized in that: have laser sensor system in space coordinates xyz, sensing system comprises laser sensor; Ox have some o, an x
1L, x
2L, x
3L..., x
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; Oy have some o, a y
1L, y
2L, y
3L..., y
nL, the spacing of two adjacent points is equal and be L, L > 0, and each point lays laser sensor; O point is the intersection point of center line ox and the oy of two row's sensors, the upper total sensor of line ox and oy centered by the sensor on o point; Oz have some o, an o
1H, o
2H..., o
eH, the spacing of two adjacent points is equal and be H, H > 0, and each point lays sensor; Through o
1H, o
2H..., o
eHpoint and upper total E the straight line parallel with ox of vertical oz, the individual straight line parallel with ox of E is central through o
1Hstraight line on there is an o
1H, x
1LH, x
2LH, x
3LH..., x
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line there is an o
2H, x
1L2H, x
2L2H, x
3L2H..., x
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, x
1LEH, x
2LEH, x
3LEH..., x
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
1H, o
2H..., o
eHput and vertical center line z have the individual straight line parallel with oy of E, in the individual straight line parallel with oy of this E, through o
1Hstraight line there is an o
1H, y
1LH, y
2LH, y
3LH..., y
nLH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through o
2Hstraight line on there is an o
2H, y
1L2H, y
2L2H, y
3L2H..., y
nL2H, the spacing of two adjacent points is equal and be L, and each point lays sensor; The rest may be inferred, through o
eHstraight line on there is an o
eH, y
1LEH, y
2LEH, y
3LEH..., y
nLEH, the spacing of two adjacent points is equal and be L, and each point lays sensor; Through an x
nL, x
nLH, x
nL2H..., x
nLEHthere is E+1 straight line parallel to each other and be parallel to yoz plane, on E+1 straight line, each straight line having N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point x
nL, x
nLH, x
nL2H..., x
nLEHstart to place; Through a y
nL, y
nLH, y
nL2H..., y
nLEHthere is E+1 straight line parallel to each other and be parallel to xoz plane; On E+1 straight line, each straight line have N+1 laser pickoff, each laser pickoff interval L; The laser pickoff of each straight line is from starting point y
nL, y
nLH, y
nL2H..., y
nLEHstart to place.
2. a laser leakage detecting system locating leaks gas methods, is characterized in that: laser sensor system comprises laser sensor and laser pickoff, and laser sensor is fixedly laid, the laser rays that laser sensor sends all with the plane orthogonal at place; The light of the laser sensor that xoz face is installed is perpendicular to xoz face, and light is launched to oy direction; The light of the laser sensor that yoz face is installed is perpendicular to yoz face, and light is launched to ox direction; The light directive that laser sensor on oz line sends is to angular direction, and the light that the laser sensor on oz line sends is parallel to each other; The light that the laser sensor of xoz plane sends all is received by the laser pickoff on opposite; The light that the laser sensor of yoz plane sends all is received by the laser pickoff on opposite, and the light that the laser sensor on oz line sends all is received by the laser pickoff on straight line (1); If laser pickoff receives generating laser x
rLnHand y
kLnHabnormal signal, just can judge laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, so just can judge: Leakage Gas position as (rL, kL, nH), 1≤r≤N, 1≤k≤N, 1≤n≤E, x
0=y
0=o, the light that the laser sensor on the oz line that the laser pickoff on straight line (1) receives sends occurs abnormal, just can judge its place general height.
3. a laser leakage detecting system locating leaks gas methods, is characterized in that: laser sensor system comprises laser sensor, and laser instrument slightly retouches formula for sweeping, and determines that the location method of gas leakage point is: if at laser rays x
rLnHwith y
kLnHpoint of intersection unusual circumstance, Leakage Gas position is (x, y, z),
Wherein,
x＝x
rLnH＝(y
kL-x
rL×tanθ
D)/(tanθ
B-tanθ
D),
y＝y
kLnH＝(x
rL×tanθ
D×tanθ
B-y
kL×tanθ
D)/(tanθ
B-tanθ
D)，
z＝nH。
4. a kind of laser leakage detecting system locating leaks gas methods according to claim 3 or 4, it is characterized in that: the optical maser wavelength that the laser sensor of laser sensor system is launched is a sweep limit centered by detected gas absorbing wavelength, for methane adsorption wavelength 1653.72nm, then the laser scanning wavelength that laser instrument is launched is 1653.72 ± 5nm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738495.8A CN104458144A (en) | 2014-12-05 | 2014-12-05 | Laser leakage detecting system and method for positioning leakage gas of laser leakage detecting system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410738495.8A CN104458144A (en) | 2014-12-05 | 2014-12-05 | Laser leakage detecting system and method for positioning leakage gas of laser leakage detecting system |
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| CN104458144A true CN104458144A (en) | 2015-03-25 |
Family
ID=52904562
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|---|---|---|---|
| CN201410738495.8A Pending CN104458144A (en) | 2014-12-05 | 2014-12-05 | Laser leakage detecting system and method for positioning leakage gas of laser leakage detecting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109630907A (en) * | 2019-02-27 | 2019-04-16 | 北京航星网讯技术股份有限公司 | Vehicle-mounted laser CH_4 detection device |
| CN110441013A (en) * | 2019-07-09 | 2019-11-12 | 青岛北创智能科技有限公司 | A kind of hazardous gas spillage point determines method, apparatus and robot system |
| CN110553587A (en) * | 2019-09-23 | 2019-12-10 | 新地能源工程技术有限公司 | Method for accurately positioning leakage point by using laser telemetering methane tester |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110553587B (en) * | 2019-09-23 | 2022-02-18 | 新地能源工程技术有限公司 | Method for accurately positioning leakage point by using laser telemetering methane tester |
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Application publication date: 20150325 |