CN102278974B - Laser ranging apparatus - Google Patents
Laser ranging apparatus Download PDFInfo
- Publication number
- CN102278974B CN102278974B CN 201010199771 CN201010199771A CN102278974B CN 102278974 B CN102278974 B CN 102278974B CN 201010199771 CN201010199771 CN 201010199771 CN 201010199771 A CN201010199771 A CN 201010199771A CN 102278974 B CN102278974 B CN 102278974B
- Authority
- CN
- China
- Prior art keywords
- light
- optical axis
- laser ranging
- receiving objective
- sensitive surface
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Optical Distance (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention provides a laser ranging apparatus. The apparatus comprises: a laser module for generating a collimated detection beam; a receiving objective lens for receiving a reflected beam of the detection beam, wherein the receiving optical axis of the receiving objective lens is parallel to the emergent optical axis of the detection beam; a photoelectric converter for carrying out photoelectric conversion for an image generated by the reflected beam on a focal plane of the receiving objective lens, wherein a sensitization surface of the photoelectric converter is positioned on the focal plane of the receiving objective lens; a control and analysis system connected with the laser module and the photoelectric converter, wherein the size of the sensitization surface of the photoelectric converter matches with the size of the imaging light spot of the receiving objective lens. According to the present invention, influence on effective light signals due to daylight and noise is reduced, such that the effective light signals are stood out from the background light; by using the photosensitive element with the small sensitization surface, and the small imaging light spot, the weak light signal reflected from the distant place can be aggregated at a maximum, therefore, with adopting the laser ranging apparatus under the sunlight, the ranging capability can be effectively enhanced, and the ranging range is further far.
Description
Technical field
The present invention relates to a kind of distance measuring equipment for measuring the testee distance, especially a kind of laser signal that sends with laser generator carries out the laser ranging system of range observation as distance measuring signal.
Background technology
Laser ranging system is widely used in the fields such as building, indoor decoration.But, existing laser range finder, precision level and measurement range be obvious variation under daylight.Its main cause is, under daylight, the bias light that daylight forms enters into the receiving system of stadimeter with the efficient light signal, causes signal to noise ratio (S/N ratio) to descend, thereby causes the decline of range capability.
In order to improve the range capability under the daylight, the measure of the following aspects is arranged, but certain limitation is arranged.
One, improves the emergent light signal intensity
Shoot laser power is subject to the safety standard restriction, can not be greater than 1mW.The mode of using continuous signal to measure, emergent light signal boost amplitude is limited.The discontinuous signal measurement mode of another kind of employing, namely laser power is lower than 1mW when not being with measuring-signal, during the band measuring-signal, far above 1mW.This mode can promote the outgoing light signal strength, guarantee that average power satisfies the safety requirement, but implementation is complicated, and cost is high.
Two, improve the enlargement factor of signal receive section
Amplifying circuit in the practical application, when heightening enlargement factor, circuit noise also can increase.When the lifting amplitude of signal during greater than the noise and increasing amplitude, signal to noise ratio (S/N ratio) increases, and to a certain enlargement factor, the noise and increasing amplitude will be greater than the lifting amplitude of signal, and signal to noise ratio (S/N ratio) begins to descend.Moreover under daylight, a little less than the signal, noise is strong.When the enlargement factor of amplifying circuit is higher than a certain value, cause easily the generation self-excitation phenomena, covered actual signal.So the enlargement factor of signal receive section can only in a rational scope, can not will improve enlargement factor as the main direction that promotes signal to noise ratio (S/N ratio) under the daylight.
Three, use narrow band pass filter
Suppose that the shoot laser frequency is 635nm, the bandwidth of narrow band pass filter is 635 ± 5nm.Day, optical spectrum was very wide, and the outer day light frequency of narrow band pass filter energy establishment bandwidth, but the day light frequency close with shoot laser then can not be suppressed.In the actual production, the optical filter bandwidth is contracted to very narrow scope, can cause transmitance reduction in the bandwidth, the efficient light signal of having decayed to a certain extent.So the mode of narrow band pass filter can improve the signal to noise ratio (S/N ratio) under the daylight, but can not thoroughly solve the low problem of signal to noise ratio (S/N ratio) under the daylight.And in actual production, the narrow band pass filter manufacturing procedure is complicated, the difficult control of performance, and cost is high.
Four, reduce the photosensitive area of signal receive section
Because some restrictions in actual production and the application, existing scheme all adopts the light activated element photosensitive area greater than the mode of imaging facula face.These limiting factors mainly contain:
When the imaging hot spot is significantly less than the light-sensitive surface of light activated element, in Project Realization that both align deviations of allowing are larger, easily alignment.
In the long-term use procedure of stadimeter, receiving objective parameter commonly used can be changed by environment (such as temperature variation, factors such as humidity variations) impact, causes that imaging facula change of shape and facula position drift about.
Equally in long-term use procedure, the factor such as expand with heat and contract with cold can cause that also small movement occurs the aligned position between light-sensitive surface and imaging facula.
Another key factor is that existing stadimeter needs the light activated element of large light-sensitive surface when close-in measurement is used, so that reduce in the prior art difficult realization of photosensitive area, be explained as follows:
Laser ranging system mainly comprises: Laser emission, receiving system and laser signal disposal system.As shown in Figure 1, Laser emission, receiving system synoptic diagram for existing laser ranging system comprise a laser module 307, for generation of the measuring beam of collimation, this alignment measurement light beam projects on the coarse target face of nature 301, forms hot spot 302 in target face 301; One receiving objective 305, for the folded light beam that receives described measuring beam, the reception optical axis 303 of receiving objective 305 is parallel with the emergent light axis 304 of measuring beam; One photoelectric commutator 306 is used for hot spot 302 is carried out opto-electronic conversion in the focus place imaging of receiving objective 305, and the light-sensitive surface of this photoelectric commutator 306 is positioned on the focal plane of receiving objective 305.
Be illustrated in figure 2 as index path, when telemeasurement, for the focal length of receiver lens 305, target face 301 at a distance is equivalent at infinity, the light beam 123 that the laser that is reflected by target face 301 forms can be seen as approx and be parallel to the parallel beam that receives optical axis 303, focus on the focus place of receiving objective 305 after process receiving objective 305 converges, and be arranged on light-sensitive surface 125 receptions of the photoelectric commutator 306 at this place; But when close-in measurement, impact owing to distance between the emergent light axis 304 of the reception optical axis 303 that is subject to receiving objective 305 and measuring beam, light beam 127 and reception optical axis 303 that the laser that is reflected by target face 301 forms are angled, the kine bias that forms after converging through receiving objective 305 is from receiving optical axis 303, thereby departs from light-sensitive surface 125.
As shown in Figure 3, for target face near the time, the biased synoptic diagram that moves of laser reflection laser image spot below is the analysis of light-sensitive surface and close-in measurement relation:
Flare is through behind the receiving objective, and on the focal plane, imaging center and the side-play amount that receives optical axis can calculate according to following formula.
In the formula: the distance between the reception optical axis of the emergent light axis of D-measuring beam and receiving objective, d-laser image spot offset distance, the L-distance of finding range, f'-receiving objective focal length.
In existing non-axis light scheme, suppose the receiving objective focal distance f ' be 32mm, two smooth axle bases are 15mm.The diameter of laser image spot is 80um, and the light-sensitive surface diameter of light activated element (photoelectric commutator) is the circle of 230um.
Beat when remote (for example 20 meters) when the outgoing measuring beam, D is 15mm, and L is 20m, calculates gained by formula 5, and the imaging facula center is 24um with the side-play amount d that receives optical axis, and the offset direction is that emergent light axis points to the direction that receives optical axis.Light image spot after departing from is in the light-sensitive surface scope (referring to Fig. 3 (a)) still, and signal is received not impact.And at closely (for example 4 meters), D still is 15mm, and L is 4m, can be calculated, imaging facula and the side-play amount d that receives between optical axis increase to 120um, and spot center has been offset out the edge of light-sensitive surface, laser image spot 38.6% also in the light-sensitive surface scope (referring to Fig. 3 (b)) that only have an appointment.When distance was nearer, shift phenomenon was more obvious.In theory, in 3.1 meters, hot spot will be offset out light-sensitive surface (referring to Fig. 3 (c)) fully.
The obvious skew in laser image spot center will have a strong impact on the intensity that receives the efficient light signal on the light-sensitive surface.Thereby can affect the in-plant measurement capability of laser range finder.The light activated element that existing non-coaxial light path scheme all adopts the light activated element of " greatly " light-sensitive surface or adopts lengthening imaging facula offset direction light-sensitive surface (as shown in Figure 4, the part that mesh lines is arranged among the figure is light-sensitive surface 1), remedied the closely side-play amount of imaging facula.Adopt this mode certainly will will have a strong impact on closely and remote signal to noise ratio (S/N ratio), reduced the measurement capability under strong bias light.
The diameter of supposing the light-sensitive surface of light activated element is contracted to 80um, and imaging facula also is that diameter is the circle of 80um, other parameter constants.Then calculate by formula 5, the flare at distance receiving objective 12m place, its imaging facula center has been offset to the light-sensitive surface edge; The flare at 6m place, its imaging facula will be offset out light-sensitive surface fully.
So in non-coaxial light path scheme, because the closely existence of imaging facula shift phenomenon can not with dwindling the light activated element light-sensitive surface to the consistent mode of imaging facula, realize optimum signal-noise ratio.
Summary of the invention
For above-mentioned prior art be difficult to improve laser range finder under strong daylight background signal to noise ratio (S/N ratio) and precision level and finding range defective of variation all the invention provides a kind of laser ranging system that still has good range capability under strong bias light.
For solving above technical matters, the present invention by the following technical solutions:
A kind of laser ranging system comprises:
One laser module, for generation of the measuring beam of collimation,
One receiving objective, for the folded light beam that receives described measuring beam, the reception optical axis of receiving objective is parallel with the emergent light axis of described measuring beam,
One photoelectric commutator is used for described folded light beam imaging on the focal plane of described receiving objective is carried out opto-electronic conversion, and the light-sensitive surface of this photoelectric commutator is positioned on the focal plane of receiving objective,
The one control analysis system that is connected with described laser module and described photoelectric commutator,
Wherein, the imaging facula size of the light-sensitive surface of described photoelectric commutator and described receiving objective is complementary, laser ranging system also comprises one makes the measuring beam turnover become the light turning device of the second light beam, the second light beam has the second optical axis, the second optical axis is parallel to the reception optical axis, and the distance between the second optical axis and the reception optical axis is less than the distance between emergent light axis and the reception optical axis.
Preferably, the imaging facula diameter of described receiving objective is 32～100 microns.
Preferably, the imaging facula diameter of described receiving objective is 50～85 microns.
Preferably, the imaging facula diameter of described receiving objective is 80 microns.
Preferably, the imaging facula area of described receiving objective is 800～7850um2.
Preferably, the imaging facula area of described receiving objective is 1960～5670um
2
Preferably, the light-sensitive surface diameter of described photoelectric commutator is 32～100 microns.
Preferably, the light-sensitive surface diameter of described photoelectric commutator is 50～85 microns.
Preferably, the light-sensitive surface diameter of described photoelectric commutator is 80 microns.
Preferably, the light-sensitive surface area of described photoelectric commutator is 800～7850um2.
Preferably, the light-sensitive surface area of described photoelectric commutator is 1960～5670um
2
Distance between described the second optical axis and the reception optical axis equals the diameter of an outgoing hot spot.
Described the second optical axis and receive distance between the optical axis be described receiving objective bore 1/12～1/3.
Described the second optical axis and receive distance between the optical axis be described receiving objective bore 1/5.
Described smooth turning device comprises parallelogram prism.
By adopting above technical scheme, the present invention can realize following useful technique effect:
(1) photoelectric commutator of the present invention adopts light-sensitive surface and imaging facula to mate suitable light activated element, promote simultaneously Iimaging Stability and the imaging capability of receiving objective, so that the imaging of receiving objective is stable and guarantee that size is in 80um, by using the light activated element of " little " light-sensitive surface, and little imaging facula, be applied under the daylight, can effectively promote range capability, finding range is farther.The faint optical signal that is reflected back at a distance can be assembled to greatest extent, and the light-sensitive surface of light activated element and object lens light spot received are complementary, and has reduced the impact of day optical noise on useful signal.This combination of 2 has improved the signal to noise ratio (S/N ratio) of light signal so that the efficient light signal highlights from bias light.And stable receiving objective can guarantee stadimeter in whole life cycle, and imaging facula does not drift about, and is indeformable, guarantees range performance.
(2) the present invention also comprises one and makes the turnover of described measuring beam become the light turning device of the second light beam, described the second light beam has the second optical axis, described the second optical axis is parallel to described reception optical axis, and the distance between the second optical axis and the reception optical axis is less than the distance between emergent light axis and the reception optical axis.Because therefore the second optical axis and to receive between the optical axis distance very near can be ignored at in-plant imaging facula center offset, remote and closely, spot center is not offset.Reduce the range finding " blind area " of super close distance, also improved the Measurement sensibility of super close distance, so that range of application is wider
After using this scheme, promoted the range capability of laser range finder under daylight, can the survey scope increase to more than 30 meters, precision can reach ± 10mm, substantially satisfies the user uses laser range finder under daylight demand.
Description of drawings
Fig. 1 is the light path system synoptic diagram of existing laser range finder, wherein the reception optical axis disalignment of the emergent light axis of measuring beam and receiving objective;
Fig. 2 is the index path of existing laser range finder when reaching close-in measurement at a distance;
Fig. 3 is for having laser range finder now when flare is close gradually, laser facula picture (imaging facula) skew synoptic diagram;
Fig. 4 is used for compensating closely spot center shift phenomenon for the light activated element light-sensitive surface shape figure that existing laser range finder has improved individually;
Fig. 5 is the synoptic diagram after light activated element light-sensitive surface (latticed), imaging facula legend and both alignment, (a) light activated element synoptic diagram wherein, (b) object lens imaging synoptic diagram, the laser facula picture that (c) has alignd and light-sensitive surface synoptic diagram;
Fig. 6 is the consistent situation of object lens imaging and the large logotype of light activated element light-sensitive surface, wherein the light-sensitive surface of (a) light activated element is less than the laser imaging hot spot, (b) light-sensitive surface of light activated element is greater than the laser imaging hot spot, and (c) light-sensitive surface of light activated element just mates the laser imaging hot spot;
Fig. 7 is the laser ranging system synoptic diagram of the first-selected embodiment of the present invention;
Fig. 8 is laser ranging system of the present invention when being used for super close distance and measuring, and the location diagram of shade and light activated element light-sensitive surface is blocked in the cross section at the focus place;
Fig. 9 is the laser ranging system close with the present invention program when being used for super close distance and measuring, and the location diagram of shade and light activated element light-sensitive surface is blocked in the cross section at the focus place.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in further detail.
Fig. 7 is the synoptic diagram of laser ranging system of the present invention, wherein mainly shows Laser emission, receiving system part.Laser ranging system comprises: a laser module 907, measuring beam 909 for generation of collimation, laser module 907 is comprised of laser generator and the collimation lens that measuring beam 909 is collimated that produces high frequency modulated measuring beam 909, this alignment measurement light beam 909 is become the second light beam 910 by 908 turnovers of a light turning device, the second light beam 910 projects on the coarse target face of nature 901, forms hot spot 902 in target face 901; A receiving objective 905, be used for receiving the folded light beam that is reflected by target face 901, the reception optical axis 903 of receiving objective 905 is parallel to the emergent light axis 911 of measuring beam 909 and the second optical axis 904 of the second light beam 910, and the distance between the second optical axis 904 and the reception optical axis 903 is less than the distance between emergent light axis 911 and the reception optical axis 903; A photoelectric commutator 906, be used for folded light beam imaging on the focal plane of receiving objective 905 is carried out opto-electronic conversion, photoelectric commutator 906 preferably adopts avalanche photodide or PIN photodiode as light activated element, and the light-sensitive surface of this light activated element is positioned on the focal plane of receiving objective 905; A control analysis system (not shown) that is connected with laser module 907 and photoelectric commutator 906 is used for that laser generator is carried out high frequency modulated and makes it produce high frequency modulated measuring beam 909 and the electric signal of photoelectric commutator 906 outputs is carried out analyzing and processing.
Smooth turning device of the present invention is a parallelogram prism, this parallelogram prism comprises two reflectings surface that are parallel to each other, the measuring beam of laser module outgoing projects on the reflecting surface and through another reflecting surface ejaculation becomes the second light beam, those skilled in the art can be easy to expect, in other embodiments, the light turning device also can adopt two catoptrons, can realize the function of parallelogram prism in the present embodiment as long as the reflecting surface of these two catoptrons is parallel to each other.
The present invention adopts the optical glass of high stability, and material is: K9.The technical requirement of receiving objective is: at the flare (wavelength is 635nm) of 30m distant place diameter 20mm, be roughly the circle of diameter 32um～100um through receiving objective imaging hot spot, the imaging facula of preferred receiving objective is about 50～85um, the light-sensitive surface of selected light activated element is the circle of diameter 32um～100um, the light-sensitive surface of preferred light photosensitive elements is the circle of diameter 50～85um, and the light-sensitive surface of first-selected light activated element is the circle of diameter 80um.Certainly, as long as light-sensitive surface and the imaging facula size of light activated element is complementary, of the present invention be complementary be defined as
All can reach the effect that improves signal to noise ratio (S/N ratio).In the imaging facula size to 80 micron, the imaging capability of receiving objective is more outstanding, and range capability can be stronger.
Because imaging facula is not to be circular completely usually, but roughly rounded, so the present invention further explains the feature of imaging facula with area, the imaging facula area of receiving objective of the present invention is 800～7850um
2, the imaging facula area of preferred receiving objective is 1960～5670um
2, the area corresponding and light-sensitive surface that imaging facula mates is 800～7850um
2, preferably the area of light-sensitive surface is 1960～5670um
2
The theory that can promote signal to noise ratio (S/N ratio) with the adaptive light-sensitive surface of imaging facula that the present invention adopts " little " is derived as follows:
For a given range measurement system, the parameters such as the focal length of receiving objective, light inlet aperture are determined.Also just determine through the receiving objective imaging at the object of a certain distance like this.
The angle of divergence of laser module ejaculation laser is fixed in the system, generally is that distance is far away, and laser facula is just larger.
For the ease of analyzing, suppose that shoot laser beats a long way off an area enough on the large metope, metope has solar radiation.In conjunction with Fig. 5 (b), in the focal plane imaging, it is superimposed as 3 with bias light as 2 to can be regarded as laser facula through receiving objective for reflector laser.Latticed part is light activated element light-sensitive surface 1 among Fig. 5 (a), the laser facula that Fig. 5 (c) has alignd as 2 with light-sensitive surface 1 synoptic diagram.
Laser facula is in the circle that is imaged as of focal plane, and establishing its luminous flux is F
i, image planes are long-pending to be S
i, laser facula is as luminous energy e
i=F
i* S
i(formula 1).
Background daylight imaging on the focal plane is equally distributed, and establishing its luminous flux is F
n
The projected area of background day light image on light-sensitive surface is S
n, background luminous energy e then
nFor: e
n=F
n* S
n(formula 2).The area of general light activated element light-sensitive surface is much smaller than the area of background daylight picture on focal plane, so the photosensitive area of light activated element is exactly the projected area of background day light image on light-sensitive surface.
The projected area of signal laser image spot on light-sensitive surface is S
s, signal luminous energy e then
sFor: e
s=F
i* S
s(formula 3).
Only the signal to noise ratio (S/N ratio) N from the angle analysis efficient light signal of luminous energy is:
(formula 4).
The light-sensitive surface of supposing selected light activated element also is circular, and area is S.Being analyzed as follows of useful signal energy and useful signal signal to noise ratio (S/N ratio):
Shown in Fig. 6 (a), light-sensitive surface 1 is less than imaging facula 2, this moment S＜S
i, S then
s=S, e
s=F
i* S, background luminous energy e
n=F
n* S, signal to noise ratio (S/N ratio)
With this understanding, signal to noise ratio (S/N ratio) N has reached maximum.Because S＜S
iSo, e
s＜e
i, can not take full advantage of laser facula as luminous energy, the gained useful signal a little less than, to the object ranging ability of distant object or antiradar reflectivity.
Shown in Fig. 6 (b), light-sensitive surface 1 is greater than imaging facula 2, this moment S＞S
i, S then
s=S
i, e
s=F
i* S
i, S
n=S, background luminous energy e
n=F
n* S, signal to noise ratio (S/N ratio)
With this understanding, e
s=e
i, can take full advantage of laser facula as luminous energy, but S＞S
iSo
Signal to noise ratio (S/N ratio) is along with the light-sensitive surface of light activated element increases and more reduces.
Shown in Fig. 6 (c), light-sensitive surface 1 imaging facula 2 in the same sizes, at this moment S=S
i, S then
s=S
i, e
s=F
i* S
i, background luminous energy e
n=F
n* S
i, signal to noise ratio (S/N ratio)
With this understanding, e
s=e
i, can take full advantage of laser facula as luminous energy.And having maximum signal to noise ratio (S/N ratio), is optimal application model.
For example, the receiving objective focal length is 32mm, and shoot laser is beaten at 20m to be had on the sunlit metope at a distance.Laser facula is the circle of diameter 20mm.Laser facula is in the circle that is imaged as diameter 32um of focal plane.Be that (area is diameter 80um with light-sensitive surface respectively
Corresponding signal to noise ratio (S/N ratio) is N
80) and 230um (area is S
230, corresponding signal to noise ratio (S/N ratio) is N
230) circular light activated element receives this light signal.Because under strong daylight, F
nMuch larger than F
i, can be calculated,
As shown in Figure 8, when being used for the super close distance measurement for laser ranging system of the present invention, the location diagram of shade and light activated element light-sensitive surface is blocked in the cross section at the focus place.The second optical axis and reception optical axis are approximate coaxial, and it approximately is to depart from an outgoing beam diameter that the spacing between the second optical axis and reception optical axis preferably is worth, and the diameter of this outgoing beam also can be expressed as the diameter of outgoing hot spot; Evidence, the second optical axis is relevant with the bore that receives spacing between optical axis and receiving objective, and two distance between axles are about about 1/12 ~ 1/3 of aperture of objective lens, all can reach better effects, and preferred two distance between axles are about 1/5 o'clock of aperture of objective lens, and effect is even more ideal.
Shifted onto as can be known by above-mentioned theory, if employing axis light scheme, i.e. emergent light axis (the second optical axis) and reception optical axis coincidence.Closely, D is about 0mm in the formula 5, can ignore at in-plant imaging facula center offset.So the axis light scheme can guarantee, remote and closely, spot center is not offset.The scheme of " dwindling " light-sensitive surface adopts the axis light scheme, so that can be used.Guarantee in whole finding range, all can reach " the best " signal to noise ratio (S/N ratio).In fact, when super close distance (less than 300mm), also there is a defective in the axis light scheme.
In the axis light scheme, be used for the optical device of turnover emergent light can be on receiving objective shading.In range measurement system, the light activated element after the alignment all is to be fixed on the focus, and when super close distance, as shown in Figure 9, light activated element light-sensitive surface 1 is in and blocks among the shade 4.At this moment the light signal that receives of light activated element all is that light path is not the straight line path along flare to light activated element through other paths reflections.Often can be subject to the variation of local reflex condition and change.So that final optical path footpath is not unique, it is uncertain to cause measuring registration like this.
When the scheme that adopts approximate axis light of the present invention, namely distance is very near between emergent light axis (the second optical axis) and the reception optical axis, can well evade this defective, can embody again the advantage of axis light.
Suppose that f' still is 32mm, the space D between two optical axises is contracted to 1.5mm.According to formula 5, even L is reduced to 2m, side-play amount d also only is 24um, and is consistent with axis light scheme effect.And when super close distance, light activated element light-sensitive surface 1 is no longer blocked (such as Fig. 8) by shade 4.
Experiment showed, and adopt approximate axis light scheme, can further dwindle the range finding " blind area " of laser ranging in the super close distance scope to 20mm, and the uniqueness that guarantees final measuring route, improve and measure reliability and precision.
Claims (15)
1. laser ranging system comprises:
One laser module, for generation of the measuring beam of collimation,
One receiving objective, for the folded light beam that receives described measuring beam, the reception optical axis of receiving objective is parallel with the emergent light axis of described measuring beam,
One photoelectric commutator is used for described folded light beam imaging on the focal plane of described receiving objective is carried out opto-electronic conversion, and the light-sensitive surface of this photoelectric commutator is positioned on the focal plane of receiving objective,
The one control analysis system that is connected with described laser module and described photoelectric commutator,
It is characterized in that: the imaging facula size of the light-sensitive surface of described photoelectric commutator and described receiving objective is complementary, described laser ranging system also comprises one makes described measuring beam turnover become the light turning device of the second light beam, described the second light beam has the second optical axis, described the second optical axis is parallel to described reception optical axis, and the distance between the second optical axis and the reception optical axis is less than the distance between emergent light axis and the reception optical axis.
2. laser ranging system according to claim 1, it is characterized in that: the imaging facula diameter of described receiving objective is 32～100 microns.
3. laser ranging system according to claim 2, it is characterized in that: the imaging facula diameter of described receiving objective is 50～85 microns.
4. laser ranging system according to claim 3, it is characterized in that: the imaging facula diameter of described receiving objective is 80 microns.
5. laser ranging system according to claim 1, it is characterized in that: the imaging facula area of described receiving objective is 800～7850um
2
6. laser ranging system according to claim 5, it is characterized in that: the imaging facula area of described receiving objective is 1960～5670um
2
7. laser ranging system according to claim 1, it is characterized in that: the light-sensitive surface diameter of described photoelectric commutator is 32～100 microns.
8. laser ranging system according to claim 7, it is characterized in that: the light-sensitive surface diameter of described photoelectric commutator is 50～85 microns.
9. laser ranging system according to claim 8, it is characterized in that: the light-sensitive surface diameter of described photoelectric commutator is 80 microns.
10. laser ranging system according to claim 1, it is characterized in that: the light-sensitive surface area of described photoelectric commutator is 800～7850um
2
11. laser ranging system according to claim 10 is characterized in that: the light-sensitive surface area of described photoelectric commutator is 1960～5670um
2
12. laser ranging system according to claim 11 is characterized in that: the distance between described the second optical axis and the reception optical axis equals the diameter of an outgoing hot spot.
13. laser ranging system according to claim 11 is characterized in that: described the second optical axis and receive distance between the optical axis be described receiving objective bore 1/12～1/3.
14. laser ranging system according to claim 13 is characterized in that: described the second optical axis and receive distance between the optical axis be described receiving objective bore 1/5.
15. to 14 each described laser ranging systems, it is characterized in that according to claim 13: described smooth turning device comprises parallelogram prism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199771 CN102278974B (en) | 2010-06-09 | 2010-06-09 | Laser ranging apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010199771 CN102278974B (en) | 2010-06-09 | 2010-06-09 | Laser ranging apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102278974A CN102278974A (en) | 2011-12-14 |
| CN102278974B true CN102278974B (en) | 2013-04-17 |
Family
ID=45104561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010199771 Active CN102278974B (en) | 2010-06-09 | 2010-06-09 | Laser ranging apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102278974B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103105140B (en) * | 2013-01-28 | 2016-03-09 | 唐山学院 | Building deformation monitoring device and the method with its monitoring |
| CN104457689B (en) * | 2013-09-25 | 2017-06-20 | 北京航天计量测试技术研究所 | A kind of optics receiving structure for closely laser range finder |
| CN106405564A (en) * | 2015-07-29 | 2017-02-15 | 上海诺司纬光电仪器有限公司 | Distance measurement system and method of calibrating optical path of distance measurement system |
| CN107121232B (en) * | 2017-05-12 | 2019-07-16 | 哈尔滨工程大学 | A kind of fin shaft device and method based on laser ranging real-time detection dynamic lift |
| FR3074308B1 (en) | 2017-11-24 | 2020-05-01 | Safran Electronics & Defense | OPTICAL MODULE FOR MONOSTATIC OR QUASI-MONOSTATIC LASER TELEMETER |
| CN109253701A (en) * | 2018-11-09 | 2019-01-22 | 中国农业大学 | Pig carcass back-fat thickness laser detection system and method |
| CN113433564B (en) * | 2020-03-06 | 2023-05-23 | 上海禾赛科技有限公司 | Laser radar and method for ranging using laser radar |
| CN111337900B (en) * | 2020-03-27 | 2022-04-22 | 广东博智林机器人有限公司 | Laser radar ranging system and laser radar |
| CN114440880B (en) * | 2022-01-28 | 2023-06-13 | 山东省路桥集团有限公司 | Construction site control point positioning method and system based on self-adaptive iterative EKF |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4575211A (en) * | 1983-04-18 | 1986-03-11 | Canon Kabushiki Kaisha | Distance measuring device |
| US4828390A (en) * | 1986-02-25 | 1989-05-09 | Okada Inc. | Optical axis displacement sensor |
| DE4211875A1 (en) * | 1990-10-09 | 1993-10-14 | Zeiss Carl Fa | Optical rangefinder with electronic correction for spot eccentricity - evaluates measurement error due to e.g. inclination of object surface in terms of spot displacement at second photodetector. |
| CN1123573A (en) * | 1993-05-15 | 1996-05-29 | 莱卡公开股份有限公司 | Device for measuring distance |
| CN1624492A (en) * | 2004-12-15 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Electro light modulation laser distance measuring method and its device |
| CN101101197A (en) * | 2006-12-31 | 2008-01-09 | 沈阳工业大学 | On-line imaging detection device and method for cylindrical internal and external wall machining accuracy |
| CN101446490A (en) * | 2008-12-25 | 2009-06-03 | 常州市新瑞得仪器有限公司 | Laser range finder |
| CN201298079Y (en) * | 2008-11-17 | 2009-08-26 | 南京德朔实业有限公司 | Laser range finding apparatus |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10332335A (en) * | 1997-04-03 | 1998-12-18 | Keyence Corp | Optical displacement gauge |
| JP2000266540A (en) * | 1999-03-17 | 2000-09-29 | Topcon Corp | Electronic level |
| US6469777B2 (en) * | 2000-06-12 | 2002-10-22 | Asahi Kogaku Kogyo Kabushiki Kaisha | Surveying instrument having an optical distance meter |
-
2010
- 2010-06-09 CN CN 201010199771 patent/CN102278974B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4575211A (en) * | 1983-04-18 | 1986-03-11 | Canon Kabushiki Kaisha | Distance measuring device |
| US4828390A (en) * | 1986-02-25 | 1989-05-09 | Okada Inc. | Optical axis displacement sensor |
| EP0234562B1 (en) * | 1986-02-25 | 1993-07-14 | Okada Inc. | Displacement sensor |
| DE4211875A1 (en) * | 1990-10-09 | 1993-10-14 | Zeiss Carl Fa | Optical rangefinder with electronic correction for spot eccentricity - evaluates measurement error due to e.g. inclination of object surface in terms of spot displacement at second photodetector. |
| CN1123573A (en) * | 1993-05-15 | 1996-05-29 | 莱卡公开股份有限公司 | Device for measuring distance |
| CN1624492A (en) * | 2004-12-15 | 2005-06-08 | 中国科学院上海光学精密机械研究所 | Electro light modulation laser distance measuring method and its device |
| CN101101197A (en) * | 2006-12-31 | 2008-01-09 | 沈阳工业大学 | On-line imaging detection device and method for cylindrical internal and external wall machining accuracy |
| CN201298079Y (en) * | 2008-11-17 | 2009-08-26 | 南京德朔实业有限公司 | Laser range finding apparatus |
| CN101446490A (en) * | 2008-12-25 | 2009-06-03 | 常州市新瑞得仪器有限公司 | Laser range finder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102278974A (en) | 2011-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102278974B (en) | Laser ranging apparatus | |
| CN111025317B (en) | Adjustable depth measuring device and measuring method | |
| CN111142088B (en) | Light emitting unit, depth measuring device and method | |
| CN101349757B (en) | Active collaboration type phase laser distance measuring method and apparatus | |
| CN111025318B (en) | Depth measuring device and measuring method | |
| CN109814082A (en) | Optical receiver module and laser radar system | |
| TW202201915A (en) | Adaptive ladar receiver | |
| CN104035099B (en) | Dual-transmitting dual-receiving phase measurement-based calibration method and range finding device | |
| CN111025321B (en) | Variable-focus depth measuring device and measuring method | |
| CN104122542A (en) | Correcting method, correcting device and measuring apparatus for laser ranging | |
| CN101852924A (en) | Automatic light beam capturing device and light beam capturing method | |
| Guillory et al. | High resolution kilometric range optical telemetry in air by radio frequency phase measurement | |
| CN204044355U (en) | A kind of calibrating installation of laser ranging and surveying instrument | |
| CN111398933B (en) | Laser radar detection system and laser radar | |
| CN111025319B (en) | Depth measuring device and measuring method | |
| CN108226947B (en) | Vortex optical ranging system based on optimal aperture noise filtering | |
| CN109211879A (en) | A kind of gas remote measurement device and method | |
| WO2016187826A1 (en) | Optical receiver and optical receiver-based optical signal adjustment method | |
| JP2000068934A (en) | Optical communication device mounted on satellite | |
| CN111427025B (en) | Laser radar and ranging method of laser radar | |
| CN112987018B (en) | Laser imaging optical system for realizing large staring visual field detection by utilizing planar micro-nano structure lens | |
| CN110530514A (en) | A kind of device and method reducing the loss of balanced homodyne detection system optics | |
| EP4228122A1 (en) | Laser emitting apparatus, laser emitting method and laser wireless charging system | |
| CN205120046U (en) | System for measure inclination and displacement | |
| CN204855796U (en) | Laser rangefinder optical system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 211106 No. 529, 159, Jiangjun Avenue, Jiangning District, Nanjing, Jiangsu Province Patentee after: Nanjing Quanfeng Technology Co.,Ltd. Address before: 211106, No. 159, general road, Jiangning economic and Technological Development Zone, Nanjing, Jiangsu Patentee before: NANJING CHERVON INDUSTRY Co.,Ltd. |
|
| CP03 | Change of name, title or address |