CN1696665A - Automatic switching device of light path of difference laser radar based on Raman technique - Google Patents
Automatic switching device of light path of difference laser radar based on Raman technique Download PDFInfo
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- CN1696665A CN1696665A CN 200410014909 CN200410014909A CN1696665A CN 1696665 A CN1696665 A CN 1696665A CN 200410014909 CN200410014909 CN 200410014909 CN 200410014909 A CN200410014909 A CN 200410014909A CN 1696665 A CN1696665 A CN 1696665A
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- raman
- light path
- laser radar
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- automatic transfer
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Abstract
An automatic switching device of light path from differential laser radar based on Raman technique consists of laser, two frequency multiplier crystals with different multiple and Raman tube set formed by three pieces being set in parallel, electric moving table, stepping motor and operation desk. The said crystals and tubes are set on laser path in sequence; the stepping motor, electric moving table and operation desk are connected to each other by guide rail, screw and nut pair to output six laser beams in different wavelength for being used in detection.
Description
Technical field the present invention relates to a kind of optical path switching device, especially based on the differential laser radar light path automatic transfer equipment of Raman technology.
Background technology is present, and people often use differential laser to survey dirty radar for the concentration of the dusty gas in the atmospheric sounding.A kind of as in the applicant's a Chinese patent CN1139802C (Granted publication day is on February 25th, 2004), once describing " being applicable to the lasing light emitter method of DIAL survey dusty gas ".The device of realizing this method is made of the frequency-doubling crystal and the Raman pipe that are provided with respectively on two laser instruments that are subjected to a two-way Q-switch control, these two laser instrument output light paths; Where applicable, two laser instruments are under the control of two-way Q-switch, alternately output wavelength is the two bundle laser of 1064nm, this two bundles laser is respectively through the frequency-doubling crystal frequency multiplication with multiple, respectively behind the Raman pipe shift frequency through being filled with methane and deuterium gas, alternately export the stimulated Raman scattering laser of the selected dusty gas of two bundle wavelength detection close, parallel beam again.But, the weak point that the pairing device of this method exists is, at first, restraint the stimulated Raman scattering laser of different wave lengths for obtaining two of alternately output, two cover LASER Light Source have been used, i.e. a two-way Q-switch, two laser instruments and two frequency-doubling crystals with multiple cause its complex structure, cost high; Secondly, alternately the stimulated Raman scattering laser of two of output bundle different wave lengths can only be used for surveying a kind of selected dusty gas, if need to survey other dusty gass, then need replace with the frequency-doubling crystal of corresponding multiple, and need the light path of having changed frequency-doubling crystal is adjusted once more, make that radar complete machine or the kind of surveying dusty gas are limited, or use, safeguard inconvenience; Once more, because of the two bundle stimulated Raman scattering laser that obtain are parallel to each other, if they are directly launched as emission light, then its echo is because of there being the blind area, to make laser radar can't receive the detection echo of in-plant dusty gas, cause the near-end distance of detection to be subjected to certain restriction.
The summary of the invention the technical problem to be solved in the present invention provides a kind of simple in structure for overcoming weak point of the prior art, practicality, the differential laser radar light path automatic transfer equipment based on Raman technology easy to use.
The technical scheme that is adopted comprises frequency-doubling crystal and the Raman pipe that is equipped with successively on laser instrument and the output light path thereof, particularly said frequency-doubling crystal is to place on the crystal electromigration platform, two of different multiples, the Raman pipe group of said Raman pipe for constituting by three Raman pipes that wherein are filled with gas with various that be arranged in parallel, and place on the pipe group electromigration platform, said crystal electromigration platform is connected with pipe group stepper motor with the crystal stepper motor respectively with pipe group electromigration platform, and the input end of said crystal stepper motor and pipe group stepper motor is electrically connected with the output terminal of crystal controllor for step-by-step motor and pipe group controllor for step-by-step motor respectively.
As the further improvement of technical scheme, the motion track of described crystal electromigration platform and pipe group electromigration platform is perpendicular to the output light path of laser instrument; Described crystal electromigration platform and pipe group electromigration platform respectively be fixed on workbench on crystal electromigration platform guide rail be connected movingly with pipe group electromigration platform guide rail; Described crystal electromigration platform is paid the crystal stepper motor that is fixed on the workbench through the leading screw nut respectively with pipe group electromigration platform and is connected with pipe group stepper motor; Nut on the described crystal electromigration platform with connect movingly with the coaxial leading screw that is connected of crystal stepper motor, the nut on the pipe group electromigration platform with connect movingly with the coaxial leading screw that is connected of pipe group stepper motor; The signal input end of described crystal controllor for step-by-step motor and pipe group controllor for step-by-step motor is electrically connected with the I/O port of microcomputer; Described laser instrument is the Nd:YAG laser instrument of coaxial output 1064nm and two wavelength of 532nm; Described frequency-doubling crystal is frequency tripling crystal and quadruple frequency crystal; Be filled with methane, deuterium gas and hydrogen respectively in three Raman pipes of described Raman pipe group; The working signal control end of the pumping source of described laser instrument is electrically connected with it through the RS232 of microcomputer port.
Beneficial effect with respect to prior art is, one, many frequency-doubling crystals and Raman pipe are placed respectively on crystal electromigration platform and the pipe group electromigration platform, by moving of control crystal electromigration platform or pipe group electromigration platform, required frequency-doubling crystal or Raman pipe can be moved into or withdraw from laser optical path, both satisfy differential laser and surveyed the requirement that to survey a kind of dusty gas concentration when dirty radar is surveyed dirt with two different laser beam of wavelength, the output that makes laser radar again can be from a wavelength Conversion to another wavelength in the extremely short time, also making two different laser beam of wavelength is coaxial emission, thereby save a cover LASER Light Source, i.e. two-way Q-switch, a laser instrument and the frequency-doubling crystal with multiple greatly simplify the structure and have reduced cost; They are two years old, place three Raman pipes that wherein are filled with gas with various that be arranged in parallel on the frequency-doubling crystal of two different multiples on the crystal electromigration platform and the pipe group electromigration platform, through different combinations, can make six laser beam that wavelength is different of its output, survey commonly used dirty demand, the i.e. requirement of the concentration of the sulphuric dioxide in the atmospheric sounding, nitrogen dioxide and ozone have been satisfied fully; Its three, not only there is not the problem of echo blind area in the coaxial emission of different wavelength of laser bundle, also available same telescope be as the mirror that transmits and receives, this is further simplified structure and reduction cost again; They are four years old, crystal electromigration platform and pipe group electromigration platform are located and supported to the guide rail that use is fixed on the workbench respectively, and use the stepper motor be fixed on the workbench to pay crystal electromigration platform through the leading screw nut respectively to be connected movingly mutually with pipe group electromigration platform, decapacitation guarantees outside the translational speed of crystal electromigration platform and pipe group electromigration platform, but Yu Yimiao and 15 second place light path with required frequency-doubling crystal and Raman pipe respectively with interior, can also guarantee its bearing accuracy after moving, its distance error is only less than 0.05 millimeter; Its five, the signal input end of crystal controllor for step-by-step motor and pipe group controllor for step-by-step motor, and the working signal control end of the pumping source of laser instrument all is electrically connected with microcomputer, and the automaticity of radar complete machine has been promoted widely.
Description of drawings is described in further detail optimal way of the present invention below in conjunction with accompanying drawing.
Fig. 1 is a kind of basic structure synoptic diagram of the present invention.
Embodiment is fixed with laser instrument 1, guide rail (4,7) and stepper motor (19,14) referring to Fig. 1 on the workbench 2; Wherein, laser instrument 1 is the Nd:YAG laser instrument of coaxial output 1064nm and two wavelength of 532nm, and the guide rail trend of guide rail (4,7) is perpendicular with the output light path of laser instrument 1.Be equipped with the electromigration platform 3 that assembles movingly with it on the guide rail 4, the nut 18 of this electromigration platform 3 on it with connect movingly with the stepper motor 19 coaxial leading screws that are connected 20, also be fixed with frequency tripling crystal 5 and quadruple frequency crystal 21 on the electromigration platform 3.Be equipped with the electromigration platform 8 that assembles movingly with it on the guide rail 7, the nut 13 of this electromigration platform 8 on it with connect movingly with the stepper motor 14 coaxial leading screws that are connected 15, also be fixed with Raman pipe group 6 on the electromigration platform 8, this Raman pipe group 6 is made up of the Raman pipe 9 that is filled with methane, the Raman pipe 11 that is filled with the Raman pipe 10 of deuterium gas and is filled with hydrogen.Stepper motor (19,14) input end respectively with controllor for step-by-step motor (17,16) output terminal is electrically connected, controllor for step-by-step motor (17,16) signal input end is electrically connected with the I/O port of microcomputer 12, and the working signal control end of the pumping source of laser instrument 1 is electrically connected with it through the RS232 of microcomputer 12 port.
During use, dusty gas according to the need detection, select frequency-doubling crystal (5,21) and Raman pipe (9,10 respectively, 11), by fast moving electromigration platform (3,8), the output light path that selected frequency tripling crystal 5 or quadruple frequency crystal 21 are placed laser instrument 1, and two Raman pipes will selecting alternately place the output light path of laser instrument 1, just can be obtained to survey the Raman scattering laser of the wavelength of this dusty gas by corresponding Raman pipe.Survey the concentration of sulphuric dioxide as need, then selected quadruple frequency crystal 21 is placed the output light path of laser instrument 1 by electromigration platform 3, and, can obtain surveying the Raman scattering laser of the required wavelength of sulfur dioxide concentration respectively by the output of Raman pipe 9 and Raman pipe 10 with the output light path that selected Raman pipe 9 and Raman pipe 10 alternately place laser instrument 1.
Obviously, those skilled in the art can carry out various changes and modification to the differential laser radar light path automatic transfer equipment based on Raman technology of the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (10)
1, a kind of differential laser radar light path automatic transfer equipment based on Raman technology, comprise the frequency-doubling crystal and the Raman pipe that are equipped with successively on laser instrument (1) and the output light path thereof, it is characterized in that said frequency-doubling crystal is for to place on the electromigration platform (3), two of different multiples, the Raman pipe group (6) of said Raman pipe for constituting by three Raman pipes that wherein are filled with gas with various that be arranged in parallel, and place on the electromigration platform (8), said electromigration platform (3,8) respectively with stepper motor (19,14) be connected, said stepper motor (19,14) input end is electrically connected with the output terminal of controllor for step-by-step motor (17,16) respectively.
2, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1 is characterized in that the output light path of the motion track of electromigration platform (3,8) perpendicular to laser instrument (1).
3, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 2 is characterized in that electromigration platform (3,8) connects movingly with the guide rail (4,7) that is fixed on the workbench (2) respectively.
4, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 3 is characterized in that electromigration platform (3,8) pays the stepper motor (19,14) that is fixed on the workbench (2) through the leading screw nut respectively and be connected.
5, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 4, it is characterized in that on the electromigration platform (3) nut (18) with connect movingly with the coaxial leading screw that is connected of stepper motor (19) (20), the nut (13) on the electromigration platform (8) with connect movingly with the coaxial leading screw that is connected of stepper motor (14) (15).
6, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1 is characterized in that the signal input end of controllor for step-by-step motor (17,16) is electrically connected with the I/O port of microcomputer (12).
7, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1 is characterized in that the Nd:YAG laser instrument of laser instrument (1) for coaxial output 1064nm and two wavelength of 532nm.
8, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1 is characterized in that frequency-doubling crystal is frequency tripling crystal (5) and quadruple frequency crystal (21).
9, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1, it is characterized in that being filled with in methane, the Raman pipe (10) in the Raman pipe (9) of Raman pipe group (6) be filled with deuterium gas, the Raman pipe is filled with hydrogen in (11).
10, the differential laser radar light path automatic transfer equipment based on Raman technology according to claim 1 is characterized in that the working signal control end of the pumping source of laser instrument (1) is electrically connected with it through the RS232 port of microcomputer (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410014909 CN1696665A (en) | 2004-05-14 | 2004-05-14 | Automatic switching device of light path of difference laser radar based on Raman technique |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200410014909 CN1696665A (en) | 2004-05-14 | 2004-05-14 | Automatic switching device of light path of difference laser radar based on Raman technique |
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| CN1696665A true CN1696665A (en) | 2005-11-16 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661206B (en) * | 2008-08-29 | 2011-11-16 | 比亚迪股份有限公司 | Laser marking machine and wavelength conversion device thereof |
| CN104466656A (en) * | 2014-12-30 | 2015-03-25 | 中国科学院长春光学精密机械与物理研究所 | Infrared continuous laser based on single-source multi-wavelength output |
-
2004
- 2004-05-14 CN CN 200410014909 patent/CN1696665A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101661206B (en) * | 2008-08-29 | 2011-11-16 | 比亚迪股份有限公司 | Laser marking machine and wavelength conversion device thereof |
| CN104466656A (en) * | 2014-12-30 | 2015-03-25 | 中国科学院长春光学精密机械与物理研究所 | Infrared continuous laser based on single-source multi-wavelength output |
| CN104466656B (en) * | 2014-12-30 | 2017-12-26 | 中国科学院长春光学精密机械与物理研究所 | A kind of infrared continuous wave laser of single source multi-wavelength output |
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