CN1912648A - Optical system of laser cule - Google Patents
Optical system of laser cule Download PDFInfo
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- CN1912648A CN1912648A CN 200510091221 CN200510091221A CN1912648A CN 1912648 A CN1912648 A CN 1912648A CN 200510091221 CN200510091221 CN 200510091221 CN 200510091221 A CN200510091221 A CN 200510091221A CN 1912648 A CN1912648 A CN 1912648A
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- laser
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- cule
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Abstract
An optical system of laser rule is featured as sending light emitted by laser source to object to be tested via lens set of emission end, forming a receiving light by reflected light of object to be tested via lens set of receiving end, entering said receiving light directly to light receiving surface of light receiving component and simultaneously reflecting residual light being not entered directly to said light receiving surface also to light receiving surface of light receiving component by reflecting curved surface of curved surface reflection component.
Description
[technical field]
The present invention relates to a kind of laser ruler, relate in particular to a kind of structure of optical system of laser cule.
[background technology]
Laser ruler (or claiming laser range finder) is one of important device that adopts the LASER Light Source measuring distance.Laser ruler commonly used uses LASER Light Source to send light modulated on target, come reflector laser signal to an optical fiber receive module by this object, optical fiber receive module generally is that (AvalanchePhoto Diode, APD), it changes into electric signal with light signal to an Avalanche Photodiode.Optical system of laser cule calculates half that sends pulse and received pulse mistiming between the two, multiply by the light velocity again and can obtain distance value.
But, laser ranging closely, the application in high precision field also has a lot of technical difficulties, the journey designs such as light path when receiving restricted problem that problem, optical fiber receive module receive the luminous energy size, high-acruracy survey as in-plant light etc.
At present, the method that the available technology adopting laser ruler carries out close-in measurement roughly is: the light that will receive converges via lens and is coupled into an optical fiber, is coupled out after certain distance by Optical Fiber Transmission again, converges to optical fiber receive module through little lens.Adopt the advantage of Optical Fiber Transmission to be, can make the position that is provided with of optical fiber receive module have bigger degree of freedom, can be applicable to remote and in-plant laser ranging simultaneously respectively.
To shown in Figure 12, United States Patent (USP) the 5th, 949 has promptly proposed plurality of proposals at the light-receiving aspect of close-in measurement No. 531 as Fig. 9.As shown in Figure 9, it adopts motor 11 to drive roller 12 and promotes the position that shell fragment 13 changes reception optical fiber 14, luminous energy is transferred on the optical fiber receive module 15, to realize the closely reception of reflection ray again.The scheme of Figure 10 has adopted catoptron 21, will be than the wide-angle incident ray of close-target by direct reflection to receiving on the optical fiber 14, pass light receiving element again back, but this mode can cause to a certain degree bending of light and scattering.Scheme shown in Figure 11 is then used a triangular prism 31, come the excessive light of deviation incident angle to measure target nearby, but the reflection ray of 31 pairs of part distant object of this triangular prism also can produce deviation, thereby make that receiving optical fiber 14 does not receive enough luminous energies, therefore need remove this assembly when measuring than far object.In Figure 12, it has adopted diffraction component 41, and this assembly can be handled the light of various incident angles well, but its structure more complicated, the cost economic benefit is more undesirable.
Simultaneously, these designs all fail to solve far, the ratio problem of energy when closely measuring.And the scheme that wherein has needs driven by motor (as shown in Figure 9), or needs specific components is inserted, extracted in light circuit when measuring far and near different distance.Mechanism that these are extra and member will increase labile factor and the fiduciary level of system is reduced to system, and the manufacturing cost of system is increased.And, the use of optical fiber, though made things convenient for the setting of mechanism position, energy must be lost, and the utilization factor of whole luminous energy is descended.
[summary of the invention]
The object of the present invention is to provide a kind of optical system of laser cule, it is under the condition of no measurement target thing, particularly under the situation of closely range finding, realize that optical fiber receive module all can obtain light signal in the measurement range (0.3-30 rice) of whole laser ruler, and the energy of light signal satisfy Avalanche Photodiode be subjected to the optical range demand.
For achieving the above object, the invention provides a kind of optical system of laser cule that a determinand is found range of being used for, the optical fiber receive module that it comprises LASER Light Source, transmitting terminal lens subassembly, receiving end lens subassembly, has the camber reflection assembly of reflecting curved surface and have optical receiving surface.Wherein, the emission light that LASER Light Source is sent arrives determinand through the transmitting terminal lens subassembly, and the reflection ray after the determinand reflection receives light via forming behind the receiving end lens subassembly.This reception light can be partly directly into the optical receiving surface that is incident upon optical fiber receive module, simultaneously, the reflecting curved surface of this camber reflection assembly can receive the optical receiving surface that light reflexes to optical fiber receive module with the residue of failing in the aforementioned reception light directly into the optical receiving surface that is incident upon optical fiber receive module.
Optical system of laser cule of the present invention utilizes the reflex of camber reflection assembly to light, realizes the reception of close-in measurement light.And, utilize aspheric surface technology processing curve reflecting surface assembly, make under the condition of no measurement target thing, can realize that optical fiber receive module all can obtain light signal in the measurement range (0.3-30 rice) of whole laser ruler, and the energy of light signal can satisfy optical fiber receive module be subjected to the optical range demand.
In addition, the present invention adopts the camber reflection assembly, makes full use of luminous energy, improves signal to noise ratio (S/N ratio); And utilize the characteristics of system self, realize the energy coincidence in the whole measurement range, no too much additional structure.Simultaneously, optical system of laser cule of the present invention has also that movable component simple in structure, no, tolerance are loose, assembly processing production height, is convenient to advantage such as volume production.
[description of drawings]
Fig. 1 is the index path of the present invention when measuring than distant object.
Fig. 2 is the index path of the present invention when measuring the closer distance target.
Fig. 3 is the view that Fig. 2 rotates to an angle along the system axis.
Fig. 4 is the structural representation of camber reflection assembly first design proposal of the present invention.
Fig. 5 is the structural representation of camber reflection assembly second design proposal of the present invention.
Fig. 6 is the synoptic diagram of optical system of the present invention.
Fig. 7 be presented at different measure apart from the time reflection ray path variation figure.
Fig. 8 is the influence that adds among the path variation figure that is presented at as shown in Figure 7 behind the camber reflection assembly light path.
Fig. 9 is the index path that adopts the prior art of optical fiber.
Figure 10 is the index path that adopts the prior art of catoptron.
Figure 11 is the index path that adopts the prior art of triangular prism.
Figure 12 is the index path that adopts the prior art of diffraction component.
[embodiment]
The detailed description of relevant optical system of laser cule of the present invention and technology contents now are that accompanying drawings is as follows:
See also Fig. 6, optical system of laser cule of the present invention is a kind of optical system that a determinand is found range of being used for, the optical fiber receive module 3 that it comprises LASER Light Source 5, transmitting terminal lens subassembly 4, receiving end lens subassembly 1, has the camber reflection assembly 2 of reflecting curved surface 20 and have optical receiving surface 30.
As Fig. 1, Fig. 2 and shown in Figure 3, be to show the index path of laser ruler of the present invention when measuring a distant object in Fig. 1, index path when Fig. 2 then shows a measurement close-in target, Fig. 3 is similar to Fig. 2, but rotates to an angle formed view in the embodiment of displayed map 2 along the system axis.In these embodiments, the emission light that LASER Light Source 5 is sent arrives determinand (not shown) through transmitting terminal lens subassembly 4, and the reflection ray after the determinand reflection receives light via the 1 back formation of receiving end lens subassembly.This reception light can be partly directly into the optical receiving surface 30 that is incident upon optical fiber receive module 3, simultaneously, the reflecting curved surface 20 of this camber reflection assembly 2 can receive light with the residue of failing in the aforementioned reception light directly into the optical receiving surface 30 that is incident upon optical fiber receive module 3, reflexes to the optical receiving surface 30 of optical fiber receive module 3.
Wherein, this camber reflection assembly 2 can be combined by two or more common spheric reflection assemblies 24,25 (Fig. 4), perhaps constitute by single aspheric surface reflection subassembly (not shown), and also can be free form surface reflection subassembly 26 (Fig. 5).
If this camber reflection assembly 2 is an aspheric surface reflection subassembly, then its radius-of-curvature can be 10～30mm, taper (conic) coefficient is-50～40, four times, six times asphericity coefficient is 0, eight times asphericity coefficient is-0.00035～0.0001, ten times asphericity coefficient is-0.00002～0.00003, and eight asphericity coefficients and ten asphericity coefficients can not be simultaneously greater than 0.
As shown in Figure 6, this receiving end lens subassembly 1 is a non-spherical lens.Consider the Laser emission light beam with and the interference problem of optical fiber receive module 3, optical system of laser cule receiving end lens subassembly 1 of the present invention is provided with a hole or breach 11 in the position of correspondence emission light transmission, to avoid transmitting and receiving the interference between the light beam.
As shown in Figure 1, the present invention is when being applied to measure at a distance, and reflection ray, directly focuses on the optical receiving surface 30 of optical fiber receive module 3 through converging of receiving end lens subassembly 1 almost with parallel angle incident.When being used to measure closely, as shown in Figures 2 and 3, reflection ray is with the incident of a certain angle of inclination, through converging of receiving end lens subassembly 1, wherein part light arrives camber reflection assembly 2, and through reflecting curved surface 20 reflections, because curvature of curved surface on-fixed value, make light to several directional divergences, a part is wherein received by optical fiber receive module 3.When measuring closely, distance is different, and the angle that light incides reflecting curved surface 20 is also different, and reflection direction also changes thereupon.Utilize the curved surface of particular design, make that the direction after the light reflection of different incident directions always contains the residing position of optical fiber receive module 3 light-receiving areas, thereby guaranteed that light arrives optical fiber receive module 3.
The determinand that the present invention is directed to can be the artificial object to be measured that is provided with, and perhaps also can be a natural target thing.Optical receiver system of the present invention is directed to and measures reflecting surface is that the situation of the reflecting surface of nature thing designs, and can realize the laser ranging of driftlessness thing.
This optical fiber receive module 3 can be a breakdown diode.Optical system of laser cule of the present invention utilizes the receiving area of optical fiber receive module 3 and the characteristic of optical focus skew closely, in the time of can realizing close-in measurement to the selection of light.Make in whole range, the signal energy difference that optical fiber receive module 3 is received is unlikely to excessive, has reduced the degree of difficulty of later stage circuit to Signal Processing.
This camber reflection assembly 2 can be placed on position as shown in Figure 1 and Figure 2, also can be placed on receiving end lens subassembly 1 near, or the arbitrary ad-hoc location between these two positions, this depends primarily on the design of curved surface.Being located at particular location between receiving end lens subassembly 1 and the optical fiber receive module 3 as for this camber reflection assembly 2, then is to obtain by computer simulation experiment control.
Again as shown in Figure 7, optical system of laser cule of the present invention because of the signal hot spot of the reflection ray that reflected back by determinand departs from the optical axis of receiving end lens subassembly 1 (aspheric mirror), and can't arrive the optical receiving surface 30 of optical fiber receive module 3 when measuring closely.Along with distance is more and more nearer, the convergent point of light behind receiving end lens subassembly 1 (aspheric mirror) also more and more departs from the optical axis of aspheric mirror.
And as shown in Figure 8, because the deviation angle of light behind receiving end lens subassembly 1 change to some extent along with the difference that measures distance, thereby in the variation range of this angle, can get the angle of intermediate value, promptly as the light of the dark straight line representative among Fig. 8.For making the optical receiving surface 30 that can arrive optical fiber receive module 3 along the light of this angle, we are placed on camber reflection assembly 2 on the light path of this light process, and the tangent line of supposing its reflecting curved surface 20 recesses is a level crossing, shown in the light dotted line (tangent line) of Fig. 8, thereby determined the position of camber reflection assembly 2.
Because of the singularity of the reflecting curved surface 20 of camber reflection assembly 2, make the different light of deviation angle all can arrive the optical receiving surface 30 of optical fiber receive module 3, thereby realized in-plant measurement through a certain pocket reflection of reflecting curved surface 20.
Therefore, optical system of laser cule of the present invention utilizes the reflex of 2 pairs of light of camber reflection assembly, realizes the reception of close-in measurement light.And, utilize aspheric surface technology processing curve reflecting surface assembly, make under the condition of no measurement target thing, can realize that optical fiber receive module all can obtain light signal in the measurement range (0.3-30 rice) of whole laser ruler, and the energy of light signal can satisfy optical fiber receive module be subjected to the optical range demand.
The present invention can make emission light that the transmitting terminal by LASER Light Source 5 places sends after the converging of receiving end lens subassembly 1, be directly incident on the optical fiber receive module 3, or incide on the optical fiber receive module 3 through camber reflection assembly 2 again, the efficiency of light energy utilization is significantly come highly than what disclose in the aforementioned prior art.
In addition, optical system of laser cule of the present invention adopts camber reflection assembly 2, can make full use of luminous energy, improves signal to noise ratio (S/N ratio); And utilize the characteristics of system self, realize the energy coincidence in the whole measurement range, no too much additional structure.Simultaneously, laser ruler of the present invention system has also that movable component simple in structure, no, tolerance are loose, assembly processing production height, is convenient to advantage such as volume production.
Claims (10)
1, a kind of optical system of laser cule can be found range to determinand; It is characterized in that: the optical fiber receive module that it comprises LASER Light Source, transmitting terminal lens subassembly, receiving end lens subassembly, has the camber reflection assembly of reflecting curved surface and have optical receiving surface; The emission light that light source sends arrives determinand through the transmitting terminal lens subassembly, reflection ray after the determinand reflection, receive light via forming behind the receiving end lens subassembly, the reflecting curved surface of this camber reflection assembly can receive the optical receiving surface that light reflexes to optical fiber receive module with the part of failing in the aforementioned reception light directly into the optical receiving surface that is incident upon optical fiber receive module.
2, optical system of laser cule as claimed in claim 1 is characterized in that: this camber reflection assembly can be formed by two or more common spheric reflection combination of components.
3, optical system of laser cule as claimed in claim 1 is characterized in that: this camber reflection assembly can be made of single aspheric surface reflection subassembly.
4, optical system of laser cule as claimed in claim 3, it is characterized in that: the radius-of-curvature of this aspheric surface reflection subassembly is 10～30mm, the taper coefficient is-50～40, four times, six times asphericity coefficient is 0, eight times asphericity coefficient is-0.00035～0.0001, ten times asphericity coefficient is-0.00002～0.00003, and eight asphericity coefficients and ten asphericity coefficients can not be simultaneously greater than 0.
5, optical system of laser cule as claimed in claim 1 is characterized in that: this camber reflection assembly can be the free form surface reflection subassembly.
6, as claim 1 or 2 or 3 or 5 described optical system of laser cule, it is characterized in that: this camber reflection assembly is located between receiving end lens subassembly and the optical fiber receive module, and its particular location can obtain by computer control emulation.
7, optical system of laser cule as claimed in claim 6 is characterized in that: this receiving end lens subassembly is a non-spherical lens.
8, optical system of laser cule as claimed in claim 7 is characterized in that: this receiving end lens subassembly is provided with a hole or breach in the position of correspondence emission light transmission, interferes to avoid launching light and to receive to produce between the light.
9, optical system of laser cule as claimed in claim 8 is characterized in that: this optical fiber receive module can be a breakdown diode.
10, optical system of laser cule as claimed in claim 1 is characterized in that: this camber reflection assembly is not movablelyly and both set a distance of the maintenance between the optical fiber receive module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100912215A CN1912648B (en) | 2005-08-10 | 2005-08-10 | Optical system of laser ruler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2005100912215A CN1912648B (en) | 2005-08-10 | 2005-08-10 | Optical system of laser ruler |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1912648A true CN1912648A (en) | 2007-02-14 |
| CN1912648B CN1912648B (en) | 2011-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2005100912215A Expired - Fee Related CN1912648B (en) | 2005-08-10 | 2005-08-10 | Optical system of laser ruler |
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| Country | Link |
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| CN (1) | CN1912648B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216558B (en) * | 2008-01-21 | 2011-08-24 | 中国科学院安徽光学精密机械研究所 | Laser radar emission and receiving light path parallel regulating system and method |
| CN102645738A (en) * | 2012-04-23 | 2012-08-22 | 南京德朔实业有限公司 | Laser range finder and condensing mirror applicable for receiving light of laser range finder |
| WO2013013349A1 (en) * | 2011-07-22 | 2013-01-31 | 江苏徕兹光电科技有限公司 | Optical system structure of laser range finder |
| WO2013013488A1 (en) * | 2011-07-22 | 2013-01-31 | 江苏徕兹光电科技有限公司 | Optical system structure of laser range finder |
| CN104457689A (en) * | 2013-09-25 | 2015-03-25 | 北京航天计量测试技术研究所 | Optical receiving and sending structure for short-distance laser distance measuring instrument |
| CN112731417A (en) * | 2020-12-18 | 2021-04-30 | 维沃移动通信有限公司 | Distance measuring device, electronic equipment and measuring method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4316348A1 (en) * | 1993-05-15 | 1994-11-17 | Wild Heerbrugg Ag | Distance measuring device |
| CN2356317Y (en) * | 1999-01-08 | 1999-12-29 | 陆建红 | Aimed semiconductor pulse laser distance measurer |
| CN2551982Y (en) * | 2002-06-14 | 2003-05-21 | 中国科学院上海光学精密机械研究所 | Flying laser pulse autocorelation measurer |
| CN2572337Y (en) * | 2002-10-18 | 2003-09-10 | 苏州－光仪器有限公司 | Optical wave rangefinder |
-
2005
- 2005-08-10 CN CN2005100912215A patent/CN1912648B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101216558B (en) * | 2008-01-21 | 2011-08-24 | 中国科学院安徽光学精密机械研究所 | Laser radar emission and receiving light path parallel regulating system and method |
| WO2013013349A1 (en) * | 2011-07-22 | 2013-01-31 | 江苏徕兹光电科技有限公司 | Optical system structure of laser range finder |
| WO2013013488A1 (en) * | 2011-07-22 | 2013-01-31 | 江苏徕兹光电科技有限公司 | Optical system structure of laser range finder |
| CN102645738A (en) * | 2012-04-23 | 2012-08-22 | 南京德朔实业有限公司 | Laser range finder and condensing mirror applicable for receiving light of laser range finder |
| CN104457689A (en) * | 2013-09-25 | 2015-03-25 | 北京航天计量测试技术研究所 | Optical receiving and sending structure for short-distance laser distance measuring instrument |
| CN112731417A (en) * | 2020-12-18 | 2021-04-30 | 维沃移动通信有限公司 | Distance measuring device, electronic equipment and measuring method |
| CN112731417B (en) * | 2020-12-18 | 2024-04-05 | 维沃移动通信有限公司 | Distance measuring device, electronic equipment and measuring method |
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| Publication number | Publication date |
|---|---|
| CN1912648B (en) | 2011-07-27 |
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