CN204855796U - Laser rangefinder optical system - Google Patents
Laser rangefinder optical system Download PDFInfo
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- CN204855796U CN204855796U CN201520365207.9U CN201520365207U CN204855796U CN 204855796 U CN204855796 U CN 204855796U CN 201520365207 U CN201520365207 U CN 201520365207U CN 204855796 U CN204855796 U CN 204855796U
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- catoptron
- receiving objective
- objective
- field lens
- speculum
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Abstract
The utility model relates to a laser rangefinder optical system belongs to laser rangefinder technical field, including receiving objective, field lens, transform objective and the photoelectric detector who arranges in proper order, receiving objective, field lens and transform objective set up to the axle construction of sharing the same light, the field lens is located the focus department of receiving objective, be provided with speculum no. 1 between receiving objective and the field lens, the centre bit of speculum no. 1 is on the optical axis of receiving objective, just speculum no. 1 is 45 settings with the optical axis of receiving objective, one side of speculum no. 1 is provided with speculum no. 2, the centre bit of speculum no. 1 and speculum no. 2 in same sharp and with the optical axis of receiving objective is perpendicular, the utility model has the characteristics of compact structure, with low costs, measurement accuracy is high, prevents effectively that strong principal wave signal from causing the damage to photoelectric detector, and application scope is wide.
Description
Technical field
The utility model belongs to laser ranging technique field, relates in particular to a kind of laser ranging optical system.
Background technology
Laser ranging refers to a kind of measuring technique utilizing the laser beam of directive measuring distance of target to carry out measurement target distance.By LASER Light Source Emission Lasers bundle, the laser beam of the overwhelming majority is emitted to measuring distance of target through laser transmitting system, and returns, as echo laser beam after measuring distance of target reflection; Echo laser beam through photoelectric detector, as echoed signal; The laser beam converge of a very little part to photodetector, as main ripple signal; By the comparative analysis of echoed signal and main ripple signal, draw measured distance in conjunction with range equation.
In existing laser distance measuring system, optical system has two kinds of design proposals: a kind of design being transmitting light path and being separated with receiving light path, and whole system is comparatively complicated, is difficult to make miniaturization; Another kind launches light path and the same shaft design of receiving light path, and its main ripple signal and echoed signal need, through different photodetectors, to there is circuit delay difference, reduces measuring accuracy.
Utility model content
For all deficiencies of prior art, in order to solve the problem, a kind of compact conformation is now proposed, cost is low, measuring accuracy is high, effectively prevents strong main ripple signal from causing damage to photodetector, laser ranging optical system applied widely and main ripple signal sampling method thereof.
For achieving the above object, the utility model provides following technical scheme:
A kind of laser ranging optical system, comprise the receiving objective be arranged in order, field lens, conversion object lens and photodetector, described receiving objective, field lens and conversion object lens are set to same plain shaft structure, described field lens is positioned at the focus place of described receiving objective, catoptron one is provided with between described receiving objective and field lens, described catoptron one be centrally located on the optical axis of receiving objective, and described catoptron one is 45 ° with the optical axis of receiving objective arranges, the side of described catoptron one is provided with catoptron two, described catoptron one and catoptron two be centrally located at same straight line and vertical with the optical axis of described receiving objective.
Further, described catoptron two be arranged in parallel with the optical axis of described receiving objective.
Further, described catoptron one, catoptron two surface are all coated with the film to laser beam high reflectance.
Further, the middle position of described receiving objective is provided with through hole, and the aperture of described through hole is greater than the diameter of laser beam.
Further, the surface of described receiving objective, field lens and conversion object lens is all coated with the film to laser beam high permeability.
Further, described photodetector is provided with the photosurface to laser beam response, and described photosurface is arranged on the focal position of described conversion object lens.
The beneficial effects of the utility model are:
1, the utility model adopts and launches light path and the same shaft design of receiving light path, and by the reflex of catoptron two, complete the sampling work of main ripple signal, compact conformation, cost are low.
2, the utility model adopts a photodetector, completes the reception work of echoed signal and main ripple signal, avoids producing circuit delay difference, and accuracy of measurement is high.
3, the utility model can according to the light intensity of Emission Lasers, the reflectivity of adjustment catoptron two, thus adjusts the light intensity of main ripple signal, effectively prevents strong main ripple signal from causing damage to photodetector.
4, the laser beam in the utility model can be continuous laser or pulse laser, applied widely.
Accompanying drawing explanation
Fig. 1 is one-piece construction schematic diagram of the present utility model;
Fig. 2 is receiving objective plan structure schematic diagram of the present utility model.
In accompanying drawing: receiving objective 1, through hole 11, catoptron 1, catoptron 23, field lens 4, conversion object lens 5, photodetector 6, laser beam 71, transmitted beam 72, transmitted light beam 81, folded light beam 82, sample beam 83, receiving beam 9.
Embodiment
The technical solution of the utility model is understood better in order to make those skilled in the art; below in conjunction with accompanying drawing of the present utility model; clear, complete description is carried out to the technical solution of the utility model; based on the embodiment in the application; other roughly the same embodiment that those of ordinary skill in the art obtain under the prerequisite not making creative work, all should belong to the scope of the application's protection.
Embodiment one:
As shown in Figure 1, a kind of laser ranging optical system, comprise the receiving objective 1, field lens 4, conversion object lens 5 and the photodetector 6 that are arranged in order, described receiving objective 1, field lens 4 and conversion object lens 5 surface are all coated with the film to laser beam 71 high permeability, described photodetector 6 is provided with the photosurface responded laser beam 71, and described photosurface is arranged on the focal position of described conversion object lens 5.
Described receiving objective 1 is for receiving described receiving beam 9, described field lens 4 to departing from the sample beam 83 of described receiving objective 1 focus, receiving beam 9 converges, described conversion object lens 5 are for changing the spot size of sample beam 83, receiving beam 9, itself and described photosurface size are matched, described photodetector 6 is for completing the reception work of echoed signal and main ripple signal, avoid producing circuit delay difference, accuracy of measurement is high.
As shown in Figure 2, the middle position of described receiving objective 1 is provided with through hole 11, and the aperture of described through hole 11 is greater than the diameter of laser beam 71, guarantees that described laser beam 71 can pass through smoothly.
Embodiment two:
As shown in Figure 1, described receiving objective 1, field lens 4 and conversion object lens 5 are set to same plain shaft structure, described field lens 4 is positioned at the focus place of described receiving objective 1, catoptron 1 is provided with between described receiving objective 1 and field lens 4, described catoptron 1 adopts edge method of clamping, it is centrally located on the optical axis of receiving objective 1, and described catoptron 1 be 45 ° with the optical axis of receiving objective 1 arranges, impel transmitting light path and receiving light path coaxial.
The side of described catoptron 1 is provided with catoptron 23, described catoptron 23 be arranged in parallel with the optical axis of described receiving objective 1, described catoptron 1 and catoptron 23 be centrally located at same straight line and vertical with the optical axis of described receiving objective 1, by the reflex of catoptron 23, complete the sampling work of main ripple signal, compact conformation, cost are low.
Described catoptron 1, catoptron 23 surface is all coated with the film to laser beam high reflectance, the reflectivity of described catoptron one 2 pairs of laser beams 71 is R1, transmissivity is T1, and T1=1-R1, 99.5%<R1<100%, the reflectivity of described catoptron 23 pairs of laser beams 71 is R2, and 0<R2<100%, according to the light intensity of Emission Lasers 72, the reflectivity R2 of adjustment catoptron 23, thus adjust the light intensity of main ripple signal, impel the light intensity magnitude of the light intensity of main ripple signal and echoed signal close, effectively prevented strong main ripple signal from causing damage to photodetector 6, described laser beam 71 can be continuous laser or pulse laser, applied widely.
Embodiment three:
As shown in Figure 1-2, described laser beam 71 is pulse laser, and power is P, and beam diameter is 20mm, pulsewidth is 10ns, wavelength is 1064nm, the reflectivity R1=99.8% of described catoptron one 2 pairs of laser beams 71, and transmissivity is T1=0.2%, the reflectivity of described catoptron 23 pairs of laser beams 71 is R2=90%, the aperture of described through hole 11 is 25mm, when utilizing the laser ranging optical system of the present embodiment to carry out laser ranging, comprises the steps:
(1) laser beam 71 is incident to catoptron 1 with the incident angle of 45 °, the side of described laser beam 71 incidence and the position not homonymy at catoptron 23 place, a part for described laser beam 71 is reflected by catoptron 1 and runs through through hole 11, as transmitted beam 72; Another part of described laser beam 71 is transmitted through catoptron 1, and as transmitted light beam 81, the power of described transmitted light beam 81 is P × 0.2%, is P × (1-99.8%);
(2) transmitted light beam 81 incides catoptron 23, and reflects through catoptron 23, and as folded light beam 82, the power of described folded light beam 82 is P × 0.2% × 90%, is P × (1-99.8%) × 90%;
(3) folded light beam 82 incides catoptron 1 again, a part for described folded light beam 82 is reflected by catoptron 1, as sample beam 83, the power of described sample beam 83 is P × 0.2% × 90% × 99.8%, is P × (1-99.8%) × 90% × 99.8%;
(4) sample beam 83 is after the convergence effect of field lens 4, is incident to conversion object lens 5 place, and described sample beam 83, after conversion object lens 5 carry out hot spot adjustment, is incident to photosurface, obtains main ripple signal;
(5) transmitted beam 72 runs through through hole 11 and arrives measuring distance of target, through measuring distance of target reflection, as receiving beam 9;
(6) receiving beam 9 is incident to receiving objective 1, more successively through field lens 4 and conversion object lens 5, carries out beams converge and hot spot adjustment, be finally incident to photosurface, obtain echoed signal;
(7) by comparing analysis to echoed signal and main ripple signal, measuring distance is drawn in conjunction with range equation.
In the present embodiment, the power of main ripple signal is about P × 0.18%, according to the light intensity of Emission Lasers 72, at the film of catoptron 23 plated surface different reflectivity, the reflectivity R2 of catoptron 23 can be adjusted, thus adjust the size of main ripple signal, can effectively prevent strong main ripple signal from causing damage to photodetector 6.
By in the present embodiment in conjunction with the measuring distance that range equation draws, compare with actual range, measuring accuracy is 99.78%.
Embodiment four:
As shown in Figure 1-2, described laser beam 71 is continuous laser, power is P, and beam diameter is 15mm, when wavelength is 905nm, the reflectivity R1=99.6% of described catoptron one 2 pairs of laser beams 71, transmissivity is T1=0.4%, and the reflectivity of described catoptron 23 pairs of laser beams 71 is R2=95%, and the aperture of described through hole 11 is 18mm, when utilizing the laser ranging optical system of the present embodiment to carry out laser ranging, comprise the steps:
(1) laser beam 71 is incident to catoptron 1 with the incident angle of 45 °, the side of described laser beam 71 incidence and the position not homonymy at catoptron 23 place, a part for described laser beam 71 is reflected by catoptron 1 and runs through through hole 11, as transmitted beam 72; Another part of described laser beam 71 is transmitted through catoptron 1, and as transmitted light beam 81, the power of described transmitted light beam 81 is P × 0.4%, is P × (1-99.6%);
(2) transmitted light beam 81 incides catoptron 23, and reflects through catoptron 23, and as folded light beam 82, the power of described folded light beam 82 is P × 0.4% × 95%, is P × (1-99.6%) × 95%;
(3) folded light beam 82 incides catoptron 1 again, a part for described folded light beam 82 is reflected by catoptron 1, as sample beam 83, the power of described sample beam 83 is P × 0.4% × 95% × 99.6%, is P × (1-99.6%) × 95% × 99.6%;
(4) sample beam 83 is after the convergence effect of field lens 4, is incident to conversion object lens 5 place, and described sample beam 83, after conversion object lens 5 carry out hot spot adjustment, is incident to photosurface, obtains main ripple signal;
(5) transmitted beam 72 runs through through hole 11 and arrives measuring distance of target, through measuring distance of target reflection, as receiving beam 9;
(6) receiving beam 9 vertical incidence is to receiving objective 1, more successively through field lens 4 and conversion object lens 5, carries out beams converge and hot spot adjustment, be finally incident to photosurface, obtain echoed signal;
(7) by comparing analysis to echoed signal and main ripple signal, measuring distance is drawn in conjunction with range equation.
In the present embodiment, the power of main ripple signal is about P × 0.38%, according to the light intensity of Emission Lasers 72, at the film of catoptron 23 plated surface different reflectivity, the reflectivity R2 of catoptron 23 can be adjusted, thus adjust the size of main ripple signal, can effectively prevent strong main ripple signal from causing damage to photodetector 6.
By in the present embodiment in conjunction with the measuring distance that range equation draws, compare with actual range, measuring accuracy is 99.86%.
Below the utility model is described in detail, the above, be only the preferred embodiment of the utility model, when not limiting the utility model practical range, namely allly do impartial change according to the application's scope and modify, all should still belong in the utility model covering scope.
Claims (6)
1. a laser ranging optical system, comprise the receiving objective be arranged in order, field lens, conversion object lens and photodetector, described receiving objective, field lens and conversion object lens are set to same plain shaft structure, it is characterized in that: described field lens is positioned at the focus place of described receiving objective, catoptron one is provided with between described receiving objective and field lens, described catoptron one be centrally located on the optical axis of receiving objective, and described catoptron one is 45 ° with the optical axis of receiving objective arranges, the side of described catoptron one is provided with catoptron two, described catoptron one and catoptron two be centrally located at same straight line and vertical with the optical axis of described receiving objective.
2. a kind of laser ranging optical system according to claim 1, is characterized in that: described catoptron two be arranged in parallel with the optical axis of described receiving objective.
3. a kind of laser ranging optical system according to claim 2, is characterized in that: described catoptron one, catoptron two surface are all coated with the film to laser beam high reflectance.
4. a kind of laser ranging optical system according to claim 3, is characterized in that: the middle position of described receiving objective is provided with through hole.
5. a kind of laser ranging optical system according to claim 4, is characterized in that: the surface of described receiving objective, field lens and conversion object lens is all coated with the film to laser beam high permeability.
6. a kind of laser ranging optical system according to claim 5, is characterized in that: described photodetector is provided with the photosurface to laser beam response, and described photosurface is arranged on the focal position of described conversion object lens.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520365207.9U CN204855796U (en) | 2015-06-01 | 2015-06-01 | Laser rangefinder optical system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520365207.9U CN204855796U (en) | 2015-06-01 | 2015-06-01 | Laser rangefinder optical system |
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|---|---|
| CN204855796U true CN204855796U (en) | 2015-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520365207.9U Expired - Fee Related CN204855796U (en) | 2015-06-01 | 2015-06-01 | Laser rangefinder optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044703A (en) * | 2015-06-01 | 2015-11-11 | 中国工程物理研究院激光聚变研究中心 | Laser range finding optical system and dominant wave signal sampling method thereof |
| WO2021134690A1 (en) * | 2019-12-31 | 2021-07-08 | 深圳市大疆创新科技有限公司 | Ranging device and ranging system |
-
2015
- 2015-06-01 CN CN201520365207.9U patent/CN204855796U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105044703A (en) * | 2015-06-01 | 2015-11-11 | 中国工程物理研究院激光聚变研究中心 | Laser range finding optical system and dominant wave signal sampling method thereof |
| CN105044703B (en) * | 2015-06-01 | 2018-06-01 | 中国工程物理研究院激光聚变研究中心 | A kind of laser ranging optical system and its main ripple signal sampling method |
| WO2021134690A1 (en) * | 2019-12-31 | 2021-07-08 | 深圳市大疆创新科技有限公司 | Ranging device and ranging system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151209 Termination date: 20160601 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |