CN206114895U - Laser radar optical receiving device - Google Patents
Laser radar optical receiving device Download PDFInfo
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- CN206114895U CN206114895U CN201621054857.2U CN201621054857U CN206114895U CN 206114895 U CN206114895 U CN 206114895U CN 201621054857 U CN201621054857 U CN 201621054857U CN 206114895 U CN206114895 U CN 206114895U
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- signal
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- optical signal
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- laser radar
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Abstract
The utility model discloses a laser radar optical receiving device, the device includes: be used for carrying on laser and visit time measuring, receive the echo signal's of lasing telescope, a field stop for limiting view field range, a collimating lens for inciting somebody to action disperse the incident light and gather for parallel emergent light, a variable optical attenuator for passing through the decay is transmitted the luminous power and is realized signal real time control, a narrowband filter for being directed at the bias light carries out the band -pass and filters, a focusing lens for setting a camera the signal focuses on, a photoelectric detector for being based on the signal of telecommunication that the luminous intensity of light signal comes output to correspond. The light signal of telescope outgoing loops through field stop, collimating lens, variable optical attenuator, narrowband filter, focusing lens, photoelectric detector from a left side to the right side. This optical receiving device adopts the decrement of variable optical attenuator control light signal, can the self -adaptation closely with remote detection demand, prevent that photoelectric detector work is in saturation region or detector loss.
Description
Technical field
The utility model is related to laser radar technique field, more particularly to a kind of laser radar optical receiver assembly.
Background technology
Laser radar is to launch the radar system of the characteristic quantities such as detecting laser beam target location.Laser radar is distant in the earth
Sense aspect is widely used, and needs to receive the laser echo signal apart from 10km-40km or so, but 10km- when being detected
40km laser echo signal luminous intensities have the scope of 6 magnitudes.When low latitude, often rise 3km echo-signals luminous intensity about
Reduce an order of magnitude；But in high space-time, often rising 10km echo-signals luminous intensity can reduce an order of magnitude.In order to improve spy
The height of survey, generally increases the transmission power of laser instrument or improves detector sensitivity.But increase the transmitting work(of laser instrument
After rate, the in-plant echo-signal in low latitude is very strong, easily causes reception system saturation, or even causes highly sensitive detector to damage
Lose.
The general method sought using channel structure design and timesharing is found range, to prevent photodetector to be operated in
Saturation region.Using the laser radar optical receiver assembly of channel structure design in prior art, wherein, will be connect by spectroscope
Receive light path and be divided near field and two, far field passage, so shunted the power of the echo-signal of each passage by light splitting, make
Must detect that the echo signal power near field and far field can be within the saturation range of photoelectric detector.
The optical receiver assembly has used spectroscope, after the completion of the device assembling, the splitting ratio of the optical receiver assembly
Fixed, so can not meet self adaptation closely with remote detection demand.
In view of this, prior art has much room for improvement and improves.
Utility model content
In view of the deficiencies in the prior art, the utility model purpose is to provide a kind of laser radar optical receiver assembly, from
And solve laser radar optical receiver assembly in prior art can not meet self adaptation closely with remote detection demand
Technical problem, simplify in prior art channel structure design, employ a condenser lens and a photodetector,
So that the device has, light path is simple, the characteristic of small volume.
The technical solution of the utility model is as follows：
A kind of laser radar optical receiver assembly, wherein, including being sequentially connected setting：
For carrying out during laser acquisition, the telescope of the echo-signal of laser is received；For the collimation collimated to optical signal
Lens；For carrying out the narrow band pass filter of bandpass filter to bias light；For being realized to optical signal by fading transmission luminous power
Control variable optical attenuator；For the condenser lens being focused to optical signal；For according to the luminous intensity of optical signal come
Export the photodetector of corresponding electric signal；
The diverging light of the telescope outgoing is collected as exiting parallel light after the collimation lens；Exiting parallel light leads to
Cross after the narrow band pass filter only by the optical signal of the narrow-band scope of transmitting laser；Optical signal is by the variable optical attenuation
Optical signal is exiting parallel light after device, and the optical power attenuation of optical signal is the function that variable optical attenuator adds magnitude of voltage；Light is believed
Number after the condenser lens, optical signals parallel input light is collected as focusing on emergent light；The photodetector receives poly-
Burnt optical signal, and the corresponding electric signal of optical signal is shown.
The laser radar optical receiver assembly, wherein, also include using between the telescope and the collimation lens
In the field stop for limiting field range.
The laser radar optical receiver assembly, wherein, the variable optical attenuator is controlled the decay of optical signal by voltage
Amount.
The laser radar optical receiver assembly, wherein, the field stop is located at the focal position of the telescope.
The laser radar optical receiver assembly, wherein, the pore size of the field stop defines that optical signal is received
Visual field size.
The laser radar optical receiver assembly, wherein, the photodetector is located at the focus position of the condenser lens
Put.
The laser radar optical receiver assembly, wherein, the variable optical attenuator is magneto-optic VOA or liquid crystal VOA.
Beneficial effect：The utility model proposes a kind of laser radar optical receiver assembly, the device employs one and gathers
Focus lens and a photodetector, in simplifying the laser radar optical receiver assembly that channel structure is designed in prior art
Using two condenser lenses and the structure of two photodetectors so that the device has that light path is simple, the characteristic of small volume；It is logical
The attenuation that variable optical attenuator controls optical signal is crossed, energy self adaptation closely and at a distance detects demand, prevents light electrical resistivity survey
Survey device and be operated in saturation region or detector loss；Magnitude of voltage in variable optical attenuator is continuously adjustable, therefore splitting ratio
It is also continuously adjustable, light splitting precision is significantly improved.
Description of the drawings
Fig. 1 is the light channel structure schematic diagram of laser radar optical receiver assembly in the utility model.
Fig. 2 is the flow chart of the operation principle of laser radar range in the utility model.
Fig. 3 is the schematic diagram of the light channel structure specific embodiment of laser radar range reception device in the present invention.
Fig. 1 symbol descriptions：21 telescopes；22 field stops；23 collimation lenses；24 narrow band pass filters；25 variable optical attenuations
Device；26 condenser lenses；27 photodetectors.
Specific embodiment
The utility model provides a kind of laser radar optical receiver assembly, to make the purpose of this utility model, technical side
Case and effect are clearer, clear and definite, and the utility model is further described below.It should be appreciated that tool described herein
Body embodiment only to explain the utility model, is not used to limit the utility model.
When laser radar range application is carried out, the target that the laser beam alignment of laser transmitter projects is detected,
Detecting laser beam to have barrier when reflected, the optical receiver assembly in laser radar receives the echo-signal and draws back
Ripple signal light intensity, obtains according to echo distance with the relation of echo-signal luminous intensity, transmitting laser intensity and other relevant parameters
Go out the distance of barrier, so, that is, realize the range finding of laser radar.
By the embodiment of laser radar range, the application to laser radar optical receiver assembly of the present utility model is carried out
Detailed description.
As shown in figure 1, being a kind of laser radar optical receiver assembly of the present utility model, the device includes：
Be successively set on telescope 21 in same light path, field stop 22, collimation lens 23, narrow band pass filter 24, can
Light attenuator 25, condenser lens 26 and photodetector 27.The optical signal of the outgoing of telescope 21 passes sequentially through regard from left to right
Field diaphragm 22, collimation lens 23, narrow band pass filter 24, variable optical attenuator 25, condenser lens 26, photodetector 27.
It is by two concave mirrors and one for carrying out the telescope 21 of the echo-signal that laser is received during laser acquisition
The reflecting telescope that individual convex reflecting mirror is constituted, is irradiated on concave mirror, through concave surface when optical signal is into the telescope
Two secondary reflections of speculum and convex reflecting mirror, optical signal is converged in the focal point of telescope.
As shown in figure 1, the emergent light data side in telescope 21 places a field stop 22, the field stop 22 is located at
The focal position of telescope 21, for limiting the field range of optical signal.The pore size of the field stop 22 defines that light is believed
Number field of view of receiver size.The optical signal of outgoing is focused on by telescope, when through field stop, only in field stop aperture
In the range of optical signal just can pass through, and the optical signal for exceeding field stop aperture edge is blocked, and is actually to stop big
The optical signal at visual angle enters the optical receiver assembly.The characteristics of laser is directional good, the angle of divergence is very little after Laser emission, swashs
Light projects 20km spot diameters and there was only 20-30cm, therefore, the spot diameter of the echo-signal of laser also very little is receiving this time
Little optical signal field of view of receiver is only needed during ripple signal, optical signal is controlled by adding the field stop of certain pore size size and is received
The size of visual field, is received so as to it also avoid substantial amounts of bias light.
As shown in figure 1, going out one collimation lens 23 of placement on the right side of light in field stop, field stop 22 is located at collimation lens
23 focal point, by after the collimation lens 23 to optical signal collimate, will diverging incident light be collected as exiting parallel light.Collimation
Lens 23 are common convex lens.
As shown in figure 1, the optical signal after collimation is incided on narrow band pass filter 24, the narrow band pass filter 24 enters to bias light
Row bandpass filter.The echo-signal that laser radar is received in addition to launching the echo-signal of laser wavelength, also including it is extraneous other
Optical signal, need to remove the bias light outside detectable signal wave band.Narrow band pass filter allows the optical signal of specific band to pass through, and deviates
Optical signal beyond this wave band is prevented from.It is thereby possible to select the narrow band pass filter of the narrow-band scope of transmitting laser, light letter
Only by the optical signal of the narrow-band scope of transmitting laser dress can be received in the optics number after the narrow band pass filter
Put the middle bias light for removing interference.Optical filter is usually that plastics or sheet glass add particular dye and form.
As shown in figure 1, placing a variable optical attenuator 25 on the right side of narrow band pass filter 24.Variable optical attenuator 25 passes through
Fading transmission luminous power realizes the control to optical signal, and the attenuation of optical signal can be controlled by voltage.Optical signal is by described
Optical signal is exiting parallel light after variable optical attenuator.Luminous power=light intensity * receives the scope (angle) of optical signal.In the dress
The angular range for putting middle variable optical attenuator reception optical signal is constant, be therefore, it can directly by the light intensity of fading transmission
Realize the control to optical signal.Variable optical attenuator (Variable optical attenuator) can be magneto-optic VOA, liquid crystal
VOA, bloom constant materials VOA etc..
In range finding, if the luminous intensity for passing through the optical signal after narrow band pass filter 24 is I0, when on variable optical attenuator
Making alive V, the optical power attenuation of optical signal is the function that variable optical attenuator adds magnitude of voltage, and the luminous intensity of outgoing optical signal is
The function of voltage V, the luminous intensity of the outgoing optical signal is I '=I0(V)。
When target is near field, the echo-signal luminous intensity of optical signal is very strong, is likely to result in the work of photodetector 27
Make to be lost in saturation region or detector, receive therefore, it is necessary to pass through the variable optical attenuator 25 and reduce photodetector 27
The echo-signal luminous intensity for arriving.It is I by the luminous intensity of the optical signal after narrow band pass filter 24 when near field is found range0 near field, it is variable
Add in optical attenuator 25 after voltage V, the luminous intensity of optical signal is I'Near field=I0 near field(V), and I' is metNear field＜ I0 near field.Can basis
Need to adjust decay amount, you can add different magnitudes of voltage as needed.As shown in figure 3, I0 near fieldRepresent that the target of range finding is nearer
When, it is I by the luminous intensity of the optical signal after narrow band pass filter 240 near field, I0 near field(V) effect by attenuator is represented, is voltage
Function；The luminous intensity of I ' should be less than detector permission it is auxiliary enter largest light intensity, more than the threshold value light intensity of detector, just can guarantee that
Can normal work.
When target is in far field, the echo-signal luminous intensity of optical signal is weaker, is not required to decay light intensity, now declines
Decrement is adjustable as 0.It is I by the luminous intensity of the optical signal after narrow band pass filter 24 when far field is found range0 far field, variable light decay
The attenuation for subtracting device 25 is 0, and the luminous intensity of optical signal is I 'Far field=I0 far field。
Impact of the distance to echo-signal luminous intensity is very big, I0 far field＜ ＜ I0 near fieldIf not increasing variable optical attenuator 25 can
The failure of photodetector 27 can be caused, after increasing variable optical attenuator 27, I' can be causedFar field、I'Near fieldValue it is close, Dou Nengluo
Enter within the investigative range of photodetector.
The relation of the voltage added on the splitting ratio γ of laser radar optical receiver assembly and variable optical attenuator 25 is：
The splitting ratio γ of laser radar optical receiver assembly is the letter of the voltage V added on variable optical attenuator 25 in formula 1
Number, the voltage of addition is continuously adjustable, therefore, splitting ratio is also continuously adjustable, and light splitting precision is significantly improved.
When echo-signal is after variable optical attenuator 25, by the condenser lens 26 that can be focused to optical signal, will
Optical signal is focused on photodetector 27, and the photodetector 27 is located at the focal position of condenser lens 26.Optical signal leads to
After crossing the condenser lens, optical signals parallel input light is collected as focusing on emergent light.The condenser lens is common convex lens
Mirror.
The optical signal of the collectiong focusing of photodetector 27, and the corresponding electric signal of optical signal is shown.The light electrical resistivity survey
Surveying device 27 is used to export corresponding electric signal according to the luminous intensity of optical signal, uses for subsequent conditioning circuit.Photodetector 27
In the focal position of the condenser lens 26.The luminous intensity of the optical signal of equity is converted electrical signals to, according to the light of the detection
The luminous intensity of signal and the luminous intensity of the laser signal of transmitter transmitting and the luminous intensity of target range and other influences optical signal
Parameter relation, target can be calculated to the distance between optical receiver.These parameters include：Laser beam characteristic, optics
System effectiveness, decay amount of optical signal etc..
Based on described above for a kind of laser radar optical receiver assembly, as shown in Fig. 2 laser radar in the utility model
The operation principle of range finding comprises the steps：
S100, laser radar transmitter are to objective emission laser signal.
Laser radar range is really encountered by laser and reflected after barrier, according to the luminous intensity of laser signal
Lose to determine the distance of target.Therefore, when being found range, it should by laser radar transmitter alignment target and launch laser letter
Number.
S200, on the variable optical attenuator of laser radar optical receiver assembly add voltage V, it is determined that pass through variable light decay
Subtract the attenuation of device optical signal.
If the transmission power of transmitter is very big, when target is low latitude object, then cause echo-signal very strong, light electrical resistivity survey
Survey device easily to reach saturation or even cause the loss of highly sensitive detector.Variable optical attenuator controls optical signal by voltage
Attenuation.When voltage is added on the variable optical attenuator in optical receiver assembly, can decay the echo optical signal of reception
Luminous power so that the luminous power of reception is in the investigative range of photodetector；When target is in high-altitude object, echo light
The meeting decay of signal, now without to adding voltage on variable optical attenuator, the light of the echo optical signal that photodetector is received
Power is actual luminous power so that the luminous power of the echo optical signal of reception is still within the investigative range of photodetector
It is interior.Voltage V to adding on variable optical attenuator can be adjusted according to the distance of detection echo-signal.
S300, with the laser radar optical receiver assembly receive laser echo signal.
Laser radar optical receiver assembly is used to receive echo optical signal, and by the optics in optical receiver assembly
Optical signal is optimized and is exported.The structure of the laser radar optical receiver assembly, as detailed above.
S400, according to receive the luminous intensity of laser signal, the luminous intensity of laser signal of transmitter transmitting, target range and
The parameter of the luminous intensity of other influences laser signal, calculates target to the distance between optical receiver.
The calculating of target to the distance between optical receiver is not only related to the luminous intensity of laser signal, also special with laser beam
Property, decay amount of optical system efficiency, optical signal etc..Distance and these parameters between have determine relation, when parameters it is true
Regularly, the distance between the target of out position and optical receiver can be calculated.
In sum, a kind of laser radar optical receiver assembly disclosed in the utility model, the device have light path it is simple,
The feature of good stability；And the optical receiver assembly controls the attenuation of optical signal using variable optical attenuator, energy self adaptation is near
Distance and at a distance detection demand, prevent photodetector to be operated in saturation region or detector loss；Variable optical attenuator
In magnitude of voltage be continuously adjustable, therefore splitting ratio is also continuously adjustable, and light splitting precision is significantly improved.
It should be appreciated that application of the present utility model is not limited to above-mentioned citing, those of ordinary skill in the art are come
Say, can according to the above description be improved or be converted, all these modifications and variations should all belong to the appended power of the utility model
The protection domain that profit is required.
Claims (6)
1. a kind of laser radar optical receiver assembly, it is characterised in that be included in what is set gradually in same light path：
For carrying out during laser acquisition, the telescope of the echo-signal of laser is received；
For the collimation lens collimated to optical signal；
For carrying out the narrow band pass filter of bandpass filter to bias light；
For realizing the variable optical attenuator of the control to optical signal by fading transmission luminous power；
For the condenser lens being focused to optical signal；
For exporting the photodetector of corresponding electric signal according to the luminous intensity of optical signal；
The diverging light of the telescope outgoing is collected as exiting parallel light after the collimation lens；Exiting parallel light passes through institute
State after narrow band pass filter only by the optical signal of the narrow-band scope of transmitting laser；Optical signal is after the variable optical attenuator
Optical signal is exiting parallel light, and the optical power attenuation of optical signal is the function that variable optical attenuator adds magnitude of voltage；Optical signal leads to
After crossing the condenser lens, optical signals parallel input light is collected as focusing on emergent light；The photodetector collectiong focusing
Optical signal, and the corresponding electric signal of optical signal is shown.
2. laser radar optical receiver assembly according to claim 1, it is characterised in that
Also include the field stop for limiting field range between telescope and collimation lens.
3. laser radar optical receiver assembly according to claim 1, it is characterised in that
The variable optical attenuator is controlled the attenuation of optical signal by voltage.
4. laser radar optical receiver assembly according to claim 2, it is characterised in that
The field stop is located at the focal position of telescope.
5. laser radar optical receiver assembly according to claim 1, it is characterised in that
The photodetector is located at the focal position of condenser lens.
6. laser radar optical receiver assembly according to claim 1, it is characterised in that
The variable optical attenuator is magneto-optic VOA or liquid crystal VOA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054857.2U CN206114895U (en) | 2016-09-13 | 2016-09-13 | Laser radar optical receiving device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621054857.2U CN206114895U (en) | 2016-09-13 | 2016-09-13 | Laser radar optical receiving device |
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| Publication Number | Publication Date |
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| CN206114895U true CN206114895U (en) | 2017-04-19 |
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| CN201621054857.2U Expired - Fee Related CN206114895U (en) | 2016-09-13 | 2016-09-13 | Laser radar optical receiving device |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154248A (en) * | 2016-09-13 | 2016-11-23 | 深圳市佶达德科技有限公司 | A kind of laser radar optical receiver assembly and laser radar range method |
| CN107703497A (en) * | 2017-11-07 | 2018-02-16 | 北京瑞特森传感科技有限公司 | Laser radar system and its lighting device and distance-finding method |
| CN108226948A (en) * | 2018-03-09 | 2018-06-29 | 北京理工大学 | A kind of three-dimensional solid-state face battle array laser radar and its distance measuring method |
| CN111381246A (en) * | 2018-12-27 | 2020-07-07 | 北京万集科技股份有限公司 | Laser radar receiving assembly and laser radar system |
| CN113206708A (en) * | 2021-05-06 | 2021-08-03 | 西安邮电大学 | High-dynamic underwater wireless light receiving system |
-
2016
- 2016-09-13 CN CN201621054857.2U patent/CN206114895U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106154248A (en) * | 2016-09-13 | 2016-11-23 | 深圳市佶达德科技有限公司 | A kind of laser radar optical receiver assembly and laser radar range method |
| CN107703497A (en) * | 2017-11-07 | 2018-02-16 | 北京瑞特森传感科技有限公司 | Laser radar system and its lighting device and distance-finding method |
| CN108226948A (en) * | 2018-03-09 | 2018-06-29 | 北京理工大学 | A kind of three-dimensional solid-state face battle array laser radar and its distance measuring method |
| CN111381246A (en) * | 2018-12-27 | 2020-07-07 | 北京万集科技股份有限公司 | Laser radar receiving assembly and laser radar system |
| CN113206708A (en) * | 2021-05-06 | 2021-08-03 | 西安邮电大学 | High-dynamic underwater wireless light receiving system |
| CN113206708B (en) * | 2021-05-06 | 2022-06-14 | 西安邮电大学 | High-dynamic underwater wireless light receiving system |
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Granted publication date: 20170419 Termination date: 20210913 |