CN2403017Y - Double-end differential absorption laser radar - Google Patents
Double-end differential absorption laser radar Download PDFInfo
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- CN2403017Y CN2403017Y CN 00229072 CN00229072U CN2403017Y CN 2403017 Y CN2403017 Y CN 2403017Y CN 00229072 CN00229072 CN 00229072 CN 00229072 U CN00229072 U CN 00229072U CN 2403017 Y CN2403017 Y CN 2403017Y
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- crystal
- telescope
- photoelectric detector
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Abstract
The utility model provides a double-end differential absorption laser radar which is used for checking the concentration of the nitrogen dioxide and the sulfur dioxide in the atmosphere. The utility model is composed of a tunable solid state laser with dipulse and dual wavelength, an optical coupling system, a telescopic optical system, an optical signal reception device and a data acquisition and processing system. A solid-state laser is adopted to make the laser radar have compact structure and stronger shockproof performance. Thus, the fast switching-over of the microsecond magnitude wave length is realized, which is in favor of the improvement of the monitoring accuracy. Through the secondary wave filtering of the high reflecting film and the interference absorber, the stray light is eliminated as much as possible; so the signal-to-noise ratio and the measuring sensitivity are improved. The utility model has the advantages of cost reduction and simple operation.
Description
The utility model relates to a kind of laser radar, is used for the concentration of nitrogen dioxide and sulphuric dioxide in the atmospheric sounding.
DIAL begins development in the seventies.As Britain's National Physical Laboratory (Martin J.T.Miltou and Peter T.Woods:Pulse averaging methods for alaser remote monitoring system using atmospheric backscattes.Appl.Opt.26 (13) .PP2598～2603.1987), Switzerland's laser is used center (H.J.k lsch.P.Rairoux.J P.Wolf. and L w ste:simultaneous No and No2 DIALmeasurement using BBO Crystals.Appl.Opt 28 (11) .PP2052～2056.1989).A common ground of this laser radar is: adopt two YAG pulsed lasers to come two dye lasers of pumping, that is to say that a laser radar will cause laser radar bulky with 4 laser instruments, cost is very high, and, be difficult for shockproof owing to used dyestuff (liquid) laser instrument.In addition, measuring different dusty gass needs different wavelength, and this laser radar wavelength switches slow, and filter structure is meticulous inadequately, and signals collecting is to the modernization inadequately of processing system.
The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part, and a kind of novel laser radar is provided, and only adopts a dipulse dual wavelength solid tuned laser in this radar.
For achieving the above object, the technical solution adopted in the utility model is: be made up of dipulse dual-wavelength tunable solid state laser, optical coupling system, telescopic optical system, light signal receiving, data Collection ﹠ Processing System.
Dipulse dual-wavelength tunable solid state laser, the laser of generation dipulse dual-wavelength tunable;
Optical coupling system comprises mirror M
1And mirror M
2, by the harmonic wave of laser instrument output through mirror M
1, M
2The reflection back is coaxial with the receiving telescope rotating shaft;
Telescopic optical system, transmitter-telescope and observation telescope are installed on the receiving telescope, place the mirror M of transmitter-telescope
3Reception is through mirror M
2Beam reflected, total reflective mirror M
5With mirror M
4The beam reflection that reflection comes enters receiving telescope, in order to measure the laser power of two pulses, total reflective mirror M
6Cooperative target during as measurement, with measuring beam reflected back receiving telescope, the light beam that enters receiving telescope is through parabolic mirror M
7Focus on, and through mirror M
8Reflection output;
Light signal receiving, the light signal that receiving telescope is received converts current signal output to through photoelectric detector, and it comprises collimating mirror L, optical filter F, unimodal high-reflecting film mirror M
9, photoelectric detector, collimating mirror L is parallel beam, optical filter F and mirror M with the focused beam of receiving telescope collimation
9Be used for the elimination parasitic light;
Data Collection ﹠ Processing System, comprise amplifier, data collecting card and computing machine, amplifier converts the current signal of photoelectric detector output to voltage signal output, response time is the ns magnitude, first via laser flash signal is exported a trigger action capture card simultaneously in the laser instrument, capture card is started working, and with the electric signal of record emission laser wave and return laser beam, the data of record are handled by computing machine again.
Advantage of the present utility model is:
1. adopt a dipulse dual-wavelength tunable solid state laser to substitute four original laser instruments, can make the laser radar compact conformation, shockproof properties strengthens, and realizes that microsecond magnitude wavelength switches fast, helps improving the environmental monitoring precision.
2. by high-reflecting film and interference filter secondary filtering, eliminate parasitic light as much as possible, improve signal to noise ratio (S/N ratio), improve and measure sensitivity and precision.
3. adopt and trigger control data capture card and Computer Processing, easy and simple to handle.
4. greatly reduce cost, be easy to promote.
Fig. 1 is a structure diagram of the present utility model.
Fig. 2 is the structure diagram of a kind of embodiment of laser instrument among Fig. 1.
Fig. 3 is the structure diagram of the another kind of embodiment of laser instrument among Fig. 1.
Fig. 4 is a kind of section of structure of light signal receiving among Fig. 1.
Below in conjunction with accompanying drawing the utility model is described in further detail.
By shown in Figure 1, the utility model is made up of dipulse dual-wavelength tunable solid state laser 1, optical coupling system 2, telescopic optical system 3, light signal receiving 4 and data Collection ﹠ Processing System 5.
A kind of version of solid state laser 1 as shown in Figure 2.One the tunnel comprises spherical reflector M
11, dispersing prism group P
1, Q-switch Q
1, laser crystal C
1, mirror M
16, dichronic mirror M
14, crystal BBO
1And level crossing M
13, another road comprises spherical reflector M
10, dispersing prism group P
2, Q-switch Q
2, laser crystal C
2, mirror M
15, dichronic mirror M
14, crystal BBO
1And level crossing M
12, crystal C
1, C
2Provide pump energy by two Laser Power Devices respectively, the crystal bar two ends are coated with the anti-reflection rete to first-harmonic.Q-switch can be KD
*The P crystal, dispersing prism is a K9 glass, grinds the location by Brewster angle, every group can be 4, spherical reflector M
11And M
10Radius-of-curvature can be 4m, be total reflection to first-harmonic 900nm wavelength, 45 ° of dichronic mirror M
14To first-harmonic is high reflection, is high permeability to harmonic wave, level crossing M
13And M
12First-harmonic and harmonic wave are high reflection.
Q
1The instantaneous conducting light path of switch, producing first-harmonic in first via optical cavity is λ
01Light pulse, but not outside the output cavity, but be used for passing through in the chamber BBO
1Crystal produces harmonic wave λ
1, wavelength X
01Value by spherical reflector M
11The position angle determine, promptly by adjusting M
11Realize λ
1Tuning.By crystal C
1Power supply trigger crystal C
2Power supply, producing first-harmonic in the second the tunnel is λ
02Light pulse, corresponding harmonic wave is λ
2The trigger delay time is in μ s magnitude.Because harmonic wave λ
1And λ
2With BBO
1The matching angle of crystal has fine difference, two harmonic wave λ that make output
1And λ
2One small angle is arranged, above the harmonic wave λ that produces of two-way
1, λ
2Pass through mirror M
17And M
18Be combined into a branch of, by mirror M
19Reflection output second harmonic.
Second harmonic is by crystal BBO
1Produce, be used for measuring N O
2, when needs are measured SO
2The time, then again with crystal BBO
2Push light path, place dichronic mirror M
14With crystal BBO
1Between, mirror M
19Be output as third harmonic.
The another kind of version of solid state laser 1 as shown in Figure 3.One the tunnel comprises spherical reflector M
20, dispersing prism group P
3, dull and stereotyped P
t, Q-switch Q
3, laser crystal C
3And mirror M
22, another road comprises spherical reflector M
21, dispersing prism group P
4, dull and stereotyped P
t, Q-switch Q
3, laser crystal C
3And mirror M
22, dull and stereotyped P
tBy motor 15 driven rotary, as dull and stereotyped P
tWhen being in solid line position, first resonator cavity work is as dull and stereotyped P
tWhen being in dotted line position, second resonator cavity work, above two-way produce first-harmonic λ respectively
01, λ
02Again by laser crystal C
4Amplify, by crystal BBO
3The output second harmonic.
With crystal BBO
4Push light path, place crystal BBO
3Afterwards, be output as third harmonic thus.
Crystal BBO
3With crystal BBO
4Push light path, its position can be respectively by piezoelectric crystal PZT
1, PZT
2Control is for making crystal BBO
4Accurately locate.Can place it on the slide plate.Piezoelectric crystal PZT
1And PZT
2Controlled by electronic switch 16.Mirror M
20, M
21Driven by stepper motor 13,14 respectively and carry out tuningly, stepper motor 13,14 and electronic switch 16 are by the unified control of computing machine.
Certainly, the control and the mirror M of above-mentioned crystal position
20, M
21Tuningly also can adopt manual control.
Above-mentioned laser crystal C
1, C
2, C
3And C
4Can be Cr: LiSAF crystal or titanium sapphire crystal.
Optical coupling system 2 comprises mirror M
1And mirror M
2, M
1And M
2Be 450nm and the bimodal high-reflecting film of 300nm or other dura mater catoptron, mirror M
1The light beam of laser instrument output is made progress catadioptric 90 °, mirror M
2Again with the light beam that makes progress to level to catadioptric 90 ° coaxial with receiving telescope 8 rotating shafts.
Telescopic optical system 3 comprises transmitter-telescope 6, observation telescope 7 and receiving telescope 8.Place the mirror M of transmitter-telescope 6
3Reception is through mirror M
2Beam reflected, mirror M
4Be the catoptron of high permeability, antiradar reflectivity, it is at 45 tilting that it and transmitter-telescope 6 are launched light beams, total reflective mirror M
5With mirror M
4The beam reflection that reflection comes enters receiving telescope 8, in order to measure the laser power of two pulses (two wavelength), total reflective mirror M
6Cooperative target during as measurement is with measuring beam reflected back receiving telescope 8, mirror M
5With M
6The mistiming of reflected back receiving telescope 8 has just been represented the measuring distance of laser radar respectively.
The enlargement factor of transmitter-telescope 6 can be 7x, angle of divergence 0.3mrad, and telescope tube is formed by two sections, with being threaded, has one to regulate pad therebetween, in order to regulate beam divergence angle.Transmitter-telescope 6 is installed on the receiving telescope 8, and the microcephaly cooperates with receiving telescope 8 rotating shafts, and major part supports with three screws, and it is parallel with the optical axis of receiving telescope 8 to be used to regulate optical axis.
The enlargement factor of observation telescope 7 can be 10x, is installed on the receiving telescope 8, and the optical axis of observation telescope 7 is parallel with the optical axis of transmitter-telescope 6.
Receiving telescope 8 comprises that diameter is the parabolic mirror M of φ 400mm
7And plane mirror M
8, two mirrors can be installed in the lens barrel of 1 meter of length, and there are two rotating shafts the lens barrel both sides, are fixed on the trolley platform by two bearing bracket stands, and lens barrel is anterior to be supported on the trolley platform with an adjusting double-screw bolt, and as required, lens barrel can be made pitch regulation.
Light signal receiving 4 comprises collimating mirror L, optical filter F, unimodal high-reflecting film mirror M
9, photoelectric detector 9, collimating mirror L is parallel beam with the focused beam of receiving telescope 8 collimation, optical filter F is used for the elimination parasitic light, centre wavelength is respectively 300.0nm and 449.0nm, bandwidth is 5.0nm, can change, unimodal high-reflecting film mirror M
9Be a reflection optical filter, centre wavelength is respectively 300.0nm and 449.0nm, and bandwidth is 5.0nm, and its effect also is to be used for the elimination parasitic light.A kind of section of structure of this device as shown in Figure 4, on collimation microscope base 26, be equipped with collimating mirror L, available nut is fixed, have unthreaded hole A in collimation microscope base 26 bottoms, collimation microscope base 26 lower ends are inserted in 8 of the receiving telescopes, make unthreaded hole A be in the focus place of receiving telescope 8, and collimation microscope base 26 upper ends are fixed on the wedge 25, wedge 25 is fixed on 8 of the receiving telescopes, an available therebetween rubber gasket.Be equipped with optical filtering bar 22 between cross-staff 20 and adapter sleeve 23, place optical filter F on it, adapter sleeve 23 usefulness springs 24 are supported on the wedge 25, and can adapter sleeve 23 toward pressing down, can be changed optical filtering bar 22 and optical filter F fast along wedge 25 upper and lower slips.Be built-in with high-reflecting film microscope base 21 at cross-staff 20, be fixed with unimodal high-reflecting film mirror M on it
9, when the high-reflecting film microscope base is installed, can guarantee mirror M with pin location
9Can make incident ray be folded to photoelectric detector 9, as required, can change high-reflecting film microscope base 21 and high-reflecting film mirror M easily
9For example, when surveying NO
2The time, mirror M
9Centre wavelength is 450nm; When surveying SO
2The time, mirror M
9Centre wavelength is 300nm.Photoelectric detector 9 (comprising the base of being with bleeder circuit) can be screwed on circuit shell block 17, circuit shell block 17 is fixed on 8 of the receiving telescopes, photoelectric detector case 18 is housed outside photoelectric detector 9, be close to photoelectric detector case 18 inwalls not alloy cover 19 of skin is housed, be used to prevent magnetic interference, after light path is adjusted, cross-staff 20 and photoelectric detector case 18 are fixed.
Photoelectric detector 9 is optional with photomultiplier or microchannel plate, and photomultiplier adopts Japanese shore pine: R928.
Data Collection ﹠ Processing System 5 comprises amplifier 10, data collecting card 11 and computing machine 12, amplifier 10 converts the current signal of photoelectric detector 9 outputs to voltage signal output, voltage output is regulated between hundreds of mV to 3V, response time is the ns magnitude, capture card 11 can adopt ADT-F905, sample rate 100M, saturation voltage 3V.First via laser flash signal is exported a trigger action capture card 11 simultaneously in the laser instrument, and capture card 11 is started working, and with the electric signal of record emission laser wave and return laser beam, the data of record are handled by computing machine 12 again.
Claims (8)
1. double End Differential Absorption Laser Radar, it is characterized in that: form by dipulse dual-wavelength tunable solid state laser (1), optical coupling system (2), telescopic optical system (3), light signal receiving (4), data Collection ﹠ Processing System (5)
Dipulse dual-wavelength tunable solid state laser (1) produces dipulse dual-wavelength tunable laser;
Optical coupling system (2) comprises mirror M
1And mirror M
2, by the harmonic wave of laser instrument (1) output through mirror M
1, M
2The reflection back is coaxial with receiving telescope (8) rotating shaft;
Telescopic optical system (3), transmitter-telescope (6) is installed on the receiving telescope (8) with observation telescope (7), places the mirror M of transmitter-telescope (6)
3Reception is through mirror M
2Beam reflected, total reflective mirror M
5With mirror M
4The beam reflection that reflection comes enters receiving telescope (8), in order to measure the laser power of two pulses, total reflective mirror M
6Cooperative target during as measurement, with measuring beam reflected back receiving telescope (8), the light beam that enters receiving telescope (8) is through parabolic mirror M
7Focus on, and through mirror M
8Reflection output;
Light signal receiving (4), the light signal that receiving telescope (8) is received converts current signal output to through photoelectric detector (9), and it comprises collimating mirror L, optical filter F, unimodal high-reflecting film mirror M
9, photoelectric detector (9), collimating mirror L is parallel beam, optical filter F and mirror M with the focused beam of receiving telescope 8 collimation
9Be used for the elimination parasitic light;
Data Collection ﹠ Processing System (5), comprise amplifier (10), data collecting card (11) and computing machine (12), amplifier (10) converts the current signal of photoelectric detector (9) output to voltage signal output, response time is the ns magnitude, first via laser flash signal is exported a trigger action capture card (11) simultaneously in the laser instrument (1), capture card (11) is started working, and with the electric signal of record emission laser wave and return laser beam, the data of record are handled by computing machine (12) again.
2. laser radar according to claim 1 is characterized in that: the structure of laser instrument (1) is that one the tunnel comprises spherical reflector M
11, dispersing prism group P
1, Q-switch Q
1, laser crystal C
1, mirror M
16, dichronic mirror M
14, crystal BBO
1And level crossing M
13, another road comprises spherical reflector M
10, dispersing prism group P
2, Q-switch Q
2, laser crystal C
2, mirror M
15, dichronic mirror M
14, crystal BBO
1And level crossing M
12, by crystal C
1Power supply trigger crystal C
2Power supply, the harmonic wave λ that top two-way is produced
1, λ
2Pass through mirror M
17And M
18Synthetic a branch of, by mirror M
19Reflection output second harmonic.
3. laser radar according to claim 2 is characterized in that: with crystal BBO
2Push light path, place dichronic mirror M
14With crystal BBO
1Between, mirror M
19Be output as third harmonic.
4. laser radar according to claim 1 is characterized in that: the structure of laser instrument (1) is that one the tunnel comprises spherical reflector M
20, dispersing prism group P
3, dull and stereotyped P
t, Q-switch Q
3, laser crystal C
3And mirror M
22, another road comprises spherical reflector M
21, dispersing prism group P
4, dull and stereotyped P
t, Q-switch Q
3, laser crystal C
3And mirror M
22, dull and stereotyped P
tBy the driven by motor rotation, two-way produces first-harmonic λ respectively above making
01, λ
02, again by laser crystal C
4Amplify, by crystal BBO
3The output second harmonic.
5. laser radar according to claim 4 is characterized in that: with crystal BBO
4Push light path, place crystal BBO
3Afterwards, export third harmonic thus.
6. according to claim 2,4 described laser radars, it is characterized in that: laser crystal C
1, C
2, C
3And C
4Can be Cr: LiSAF crystal or titanium sapphire crystal.
7. laser radar according to claim 1, it is characterized in that, the structure of light signal receiving (4) is, on collimation microscope base (26), be equipped with collimating mirror L, have unthreaded hole A in collimation microscope base (26) bottom, collimation microscope base (26) lower end is inserted in receiving telescope (8) tube, make unthreaded hole A be in the focus place of receiving telescope (8), collimation microscope base (26) upper end is fixed on the wedge (25), wedge (25) is fixed on receiving telescope (8) tube, between cross-staff (20) and adapter sleeve (23), be equipped with optical filtering bar (22), place optical filter F on it, adapter sleeve (23) is supported on the wedge (25) with spring (24), and can be along on the wedge (25), lower slider, be built-in with high-reflecting film microscope base (21) at cross-staff (20), be fixed with unimodal high-reflecting film mirror M on it
9Photoelectric detector (9) is fixed on the circuit shell block (17), circuit shell block (17) is fixed on receiving telescope (8) tube, photoelectric detector case (18) is housed outside photoelectric detector (9), be close to photoelectric detector case (18) inwall not alloy cover (19) of skin is housed, cross-staff (20) fixes with photoelectric detector case (18).
8. according to claim 1,7 described laser radars, it is characterized in that: photoelectric detector (9) is photomultiplier or microchannel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00229072 CN2403017Y (en) | 2000-01-11 | 2000-01-11 | Double-end differential absorption laser radar |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 00229072 CN2403017Y (en) | 2000-01-11 | 2000-01-11 | Double-end differential absorption laser radar |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2403017Y true CN2403017Y (en) | 2000-10-25 |
Family
ID=33592438
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 00229072 Expired - Fee Related CN2403017Y (en) | 2000-01-11 | 2000-01-11 | Double-end differential absorption laser radar |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2403017Y (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518085B (en) * | 2003-01-15 | 2010-05-12 | 内格夫技术有限公司 | High-speed in-line electro-optics testing method and system for defects on chip |
| CN102288550A (en) * | 2010-06-21 | 2011-12-21 | 张国胜 | Differential measuring method and device applicable to photoelectric detection |
| CN102353650A (en) * | 2011-07-06 | 2012-02-15 | 南京信息工程大学 | Method and system for detecting liquid explosive based on laser radar technology |
| CN101776751B (en) * | 2010-01-21 | 2012-05-23 | 北京理工大学 | Laser radar echo optical signal filtering and gating system |
| CN102495041A (en) * | 2011-12-08 | 2012-06-13 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN1942780B (en) * | 2004-04-02 | 2012-07-04 | 莱卡地球系统公开股份有限公司 | Electronic distance meter featuring spectral and spatial selectivity |
| CN103115888A (en) * | 2013-02-02 | 2013-05-22 | 中国科学院安徽光学精密机械研究所 | Time division multiplexing system for data collection by utilizing differential absorption lidar |
| CN105572097A (en) * | 2015-12-29 | 2016-05-11 | 北京华泰诺安探测技术有限公司 | Dual-wavelength remote Raman detection system |
-
2000
- 2000-01-11 CN CN 00229072 patent/CN2403017Y/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1518085B (en) * | 2003-01-15 | 2010-05-12 | 内格夫技术有限公司 | High-speed in-line electro-optics testing method and system for defects on chip |
| CN1942780B (en) * | 2004-04-02 | 2012-07-04 | 莱卡地球系统公开股份有限公司 | Electronic distance meter featuring spectral and spatial selectivity |
| CN101776751B (en) * | 2010-01-21 | 2012-05-23 | 北京理工大学 | Laser radar echo optical signal filtering and gating system |
| CN102288550A (en) * | 2010-06-21 | 2011-12-21 | 张国胜 | Differential measuring method and device applicable to photoelectric detection |
| CN102353650A (en) * | 2011-07-06 | 2012-02-15 | 南京信息工程大学 | Method and system for detecting liquid explosive based on laser radar technology |
| CN102495041A (en) * | 2011-12-08 | 2012-06-13 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN102495041B (en) * | 2011-12-08 | 2013-09-11 | 吉林大学 | Optical diagnostic system on basis of laser spontaneous Raman scattered ray imaging |
| CN103115888A (en) * | 2013-02-02 | 2013-05-22 | 中国科学院安徽光学精密机械研究所 | Time division multiplexing system for data collection by utilizing differential absorption lidar |
| CN105572097A (en) * | 2015-12-29 | 2016-05-11 | 北京华泰诺安探测技术有限公司 | Dual-wavelength remote Raman detection system |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |