CN107102314A - Rangefinder based on LED/light source - Google Patents
Rangefinder based on LED/light source Download PDFInfo
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- CN107102314A CN107102314A CN201710251044.5A CN201710251044A CN107102314A CN 107102314 A CN107102314 A CN 107102314A CN 201710251044 A CN201710251044 A CN 201710251044A CN 107102314 A CN107102314 A CN 107102314A
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/483—Details of pulse systems
- G01S7/484—Transmitters
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Measurement Of Optical Distance (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a kind of rangefinder based on LED/light source, including emission system, reception system and processing system, processing system is electrically connected with emission system and reception system respectively, emission system includes LED/light source and diversing lens device, the light that LED/light source is sent is launched by diversing lens device, reception system includes focus lens unit and detector, detector is connected with processing system, focus lens unit receives the light reflected by target object, focus on detector, reflected light information is converted into electric signal and is sent to processing in processing system by detector.Rangefinder disclosed by the invention based on LED/light source, LD light sources are substituted with the LED/light source of phase co-wavelength, the diversing lens device for being adapted to LED/light source transmitting with improving simultaneously, LED/light source is become like the collimated light beam of LD light sources, not only reduce cost, it is more obvious that the bigger cost of power is reduced, and also greatly increases detection range.
Description
Technical field
The present invention relates to rangefinder technical field, more particularly to a kind of rangefinder that ranging is carried out based on LED/light source.
Background technology
In the prior art, ranging from instrument generally use laser range finder, laser range finder is using modulating laser
Some parameter realizes the instrument of the range measurement to target.It is divided into ranging phase method instrument and impulse method rangefinder according to distance-finding method,
Pulse type laser rangefinder is operationally to project a branch of or of short duration pulse laser beam of a sequence to target, is received by photoelectric cell
The laser beam of target reflection, timer determines laser beam from the time for being transmitted into reception, calculates from observer's range-to-go.
The phase difference that Phase Laser Range Finder is occurred when being and being propagated in space using detection transmitting light and reflected light is come detecting distance.
Widely, as far as Satellite observation, closely to interior decoration, precision can reach millimeter for the application of laser range finder
Level, the laser range finder of military and technical grade can detect far distance, but civilian or family expenses laser range finder can only be visited
The distance of tens meters of survey is exactly country also with regard to 100 meters or so under most ideal conditions, the reason for crucial to civilian laser
The luminous power of device has extremely strict limitation, by taking laser range finder as an example, and the transmission power of laser cannot be greater than 1mW, and this is just big
Limit detection range greatly, can only update raising in the sensitivity of receiver and signal transacting, but be after all signal too
Weak, detection range can not possibly have more significantly to be improved, and this is for outdoor detection just without what practical value.
The content of the invention
For weak point present in above-mentioned technology, the present invention provides a kind of rangefinder based on LED/light source, with identical
LED (light emitting diode) light source of wavelength substitutes LD (laser diode) light source, while launched with the suitable LED light improved
Diversing lens device becomes like LED light LD collimated light beam, has not only saved cost, and increases power, but also
Considerably increase detection range.
In order to achieve the above object, the invention discloses a kind of rangefinder based on LED/light source, including：Emission system, connect
Receipts system and processing system, the processing system are electrically connected with emission system and reception system respectively, and the emission system includes
LED/light source and diversing lens device, the light that LED/light source is sent are launched by diversing lens device, the reception system bag
Focus lens unit and detector are included, detector is connected with processing system, focus lens unit receives the transmitting of diversing lens device
The light reflected by target object gone out, is focused on detector, and reflected light information is converted into electric signal and sent by detector
Handled into processing system.
Wherein, the diversing lens device is that the light of a spot light for sending LED/light source is changed into the list of collimated light beam
Convex lens, single convex lens are located at the light-emitting window of rangefinder, and LED/light source is located at the focal position of single convex lens, LED/light source
The light sent is parallel after single convex lens to be projected, and the single convex lens and LED/light source are coaxial to be set.
Wherein, the diversing lens device is two-lens structure, including a convex lens and a concavees lens, convex lens are leaned on
Nearly LED/light source, and the distance between the center of LED/light source and convex lens is more than one times of focal length, the concavees lens are parallel to convex lens
Mirror, and close to light-emitting window position, the centre distance of the concavees lens and convex lens is less than the image distance of convex lens, and convex lens into
Image position is exactly the right survey focal position of concavees lens；The convex lens, concavees lens and the coaxial setting of LED/light source.
Wherein, the diversing lens device is two-lens structure, including one big convex lens and a small convex lens are convex greatly
Lens are close to LED/light source, and the distance between LED/light source and big convex lens are more than one times of focal length, and the small convex lens are close to going out
Optical port position, and the distance between small convex lens and big convex lens are more than the image distance of big convex lens, and big convex lens into image position
It is exactly the left survey focal position of small convex lens to put so that emergent ray on the right side of small convex lens is directional light, the big convex lens and
Small convex lens are coaxial with LED/light source to be set.
Wherein, the diversing lens device is total internal reflection lens, and the LED/light source is mounted on total internal reflection lens
One end, the other ends of the total internal reflection lens is towards light-emitting window position.
Wherein, in the front end of light-emitting window, and also set parallel to the position of diversing lens device and focus lens unit simultaneously
Sampler is equipped with, the sampler is the sampling prism of triangle, and sampling prism is respectively with diversing lens device with focusing on
Lens devices it is a part of overlapping, the sampler is set only for impulse method ranging, is not required to as using if ranging phase method
Will the sampler.
Wherein, the LED/light source is single lamp source or many lamp sources, and LED/light source sends the light or infrared of red
Light, dominant wavelength ranges are between 600~2000nm.
Wherein, the angle demodulator of intensity adjustment and LED/light source emergent light is provided with the LED/light source, it is described strong
Degree adjuster and angle demodulator are manual regulation, mechanical adjustment or automatically adjusted, the angle of the beam divergence angle of the LED/light source
It is 0 degree to 5 degree to spend adjustable range.
Wherein, the modulating frequency of the LED light source signal is 1MHZ to 1000MHZ.
Wherein, LD light sources are additionally provided with the emission system, the LD light sources pass through mode selector switch with LED/light source
Switching is used, and LD light sources are electrically connected with LED/light source with processing system.
The beneficial effects of the invention are as follows：
Compared with prior art, the rangefinder disclosed by the invention based on LED/light source, is replaced with the LED/light source of phase co-wavelength
For LD light sources, while being adapted to the diversing lens device that LED/light source is launched with improving, LED/light source is become like LD light sources
Collimated light beam.Because LED/light source cost is extremely cheap compared to laser diode (LD), electro-optical efficiency is higher by more than ten again
Times, and the light rate of single LEDs light source chip can reach several watts, long lifespan reaches tens of thousands of hours, and substituting LD light sources with LED/light source does
The light source of rangefinder not only reduces cost, and it is more obvious that the bigger cost of power is reduced, and also greatly increases detection range.
Brief description of the drawings
Fig. 1 is overall structure block diagram of the invention；
Fig. 2 is first embodiment of the invention structured flowchart；
Fig. 3 is the first structural representation of diversing lens device of the present invention；
Fig. 4 is second of structural representation of diversing lens device of the present invention；
Fig. 5 is the third structural representation of diversing lens device of the present invention；
Fig. 6 is the 4th kind of structural representation of diversing lens device of the present invention；
Fig. 7 is second embodiment of the invention structured flowchart.
Main components explanation：
1st, emission system 2, reception system
3rd, processing system 4, sampler
11st, LED/light source 12, diversing lens device
21st, focus lens unit 22, detector
31st, trigger 32, counter
33rd, display 34, amplification and filtration module
35th, compare and Shaping Module.
Embodiment
In order to more clearly state the present invention, the present invention is further described below in conjunction with the accompanying drawings.
Fig. 1-Fig. 2 is referred to, the present invention provides a kind of rangefinder based on LED/light source, and the rangefinder can be impulse method
The rangefinder of measurement or the rangefinder measured with phase method, in the present embodiment, the rangefinder measured with impulse method
Mechanism illustrates the application of structure of the present invention.In the present embodiment, the rangefinder of LED/light source includes：Emission system 1, reception
System 2 and processing system 3, are connected with sampler 4,3 points of triggered display system between emission system 1 and reception system 2
Do not electrically connected with emission system 1 and reception system 2, in the present embodiment, emission system 1 includes LED/light source 11 and diversing lens
Device 12, reception system 2 includes focus lens unit 21 and detector 22, and processing system 3 includes amplification and filtration module 34, ratio
Compared with Shaping Module 35, trigger 31, counter 32 and display 33, in the present embodiment, detector 22 with amplification and filter
Module 34 is electrically connected, and amplification and filtration module 34 are electrically connected with being compared with Shaping Module 35, is compared and Shaping Module 35 and triggering
Device 31 is electrically connected, and trigger 31 is electrically connected with counter 32, and counter 32 is electrically connected with display 33, and counter 32 and triggering
Device 31 is electrically connected with LED/light source 11 simultaneously.In the present embodiment, after the light that LED/light source 11 is sent is by diversing lens device 12
Gone out from light-emitting window, diversing lens device 12 mainly pools the light source that LED/light source dissipates as LD LASER Light Sources
Collimated light beam, the illumination sent out by diversing lens device 12 is mapped on target object, is reflected again, by reception system 2
On focus lens unit 21 receive, focus lens unit 21 includes condenser lens 211 and optical filter 212, and what is reflected is flat
Row light is filtered by being gathered together after condenser lens 211, then by the veiling glare of optical filter 212, is received, is visited by detector 22
Survey device 22 optoelectronic information of detection is delivered in amplification and filtration module 34 be amplified with after filtering process, then by comparing
With passed to trigger 31 after the comparison and shaping of Shaping Module 35, trigger 31 and LED/light source 11 and counter 32 are simultaneously
Connection, trigger 31 is received after photosignal, is carried out technology to optical path information by counter 32 and is calculated specific distance,
And show on the display 33, meanwhile, trigger 31 constantly triggers LED/light source 11 before specific data are not detected also
Launch light source.In the present embodiment, the basis that counter 32 is counted, is the sampling of sampler 4, in the present embodiment, takes
Sampling device 4 is set to the sampling prism of triangle, and sampling prism respectively with diversing lens device 12 and focus lens unit 21
It is parallel, and it is a part of overlapping with focus lens unit 21 with diversing lens device 12 respectively to sample prism, in order to more preferable
Ground receives transmitting and is reflected back light information.
Compared with prior art, LD light sources mainly on 75m, are substituted for LED/light source by the present invention, LED/light source with
LD light sources are compared, and feature is as follows：
1) it is diverging to light, but the lighting angle of packaged LED lamp bead can concentrate on tens degree of scope, is added
Optical focusing system can make the same effect of similar laser beam；
2) the corresponding time is identical, and the response time of red-light LED light source is again smaller than 10-9Second (nanosecond), completely can be as laser
LD equally sends ultrashort pulse or the high frequency modulated by hundreds of million Hz；
3) LED/light source is not monochromatic, but spectrum is very narrow, by taking 635nm red-light LEDs as an example, and its halfwidth only has nm more than 20,
That is most light can be by the optical filter before the detector of laser range finder, usual bandwidth is also nm more than 20；
4) the luminous of LED/light source is not relevant nor polarization, but rangefinder and does not need these characteristics；
5) the far super LD light sources of the luminous efficiency of LED/light source, by taking the laser in current laser range finder as an example, output swash
Luminous power is 1mW, and driving electrical power is mW more than 20, and electro-optical efficiency is less than 5%, and LED electro-optical efficiency surpasses already
Cross 60%, that is identical electrical power drives LED, can send more than ten times stronger than LD light source of light；
6) price of LED/light source is extremely cheap, and the price of 1mW lasers is several pieces of RMB in current laser range finder
Money, and light output mW more than 20 LED chip is less than 1 point of of RMB, finished product lamp bead also only money, the high-power feux rouges of 5W in a measure
LED chip also only has 0.7 yuan of RMB, and 5W high-power semiconductor lasers want thousands of members, and bulky；
7) LED/light source is usually constructed with 50,000 hour life-span, and it is enough to be used as ranging.Present invention phase co-wavelength
LED/light source substitutes LD light sources, while being adapted to the diversing lens device that LED/light source is launched with improving, LED/light source is become like
The collimated light beam of LD light sources.Because LED/light source cost is extremely cheap compared to laser diode (LD), electro-optical efficiency is again high
Go out more than ten times, and the light rate of single LEDs light source chip can reach several watts, long lifespan reaches tens of thousands of hours, and LD is substituted with LED/light source
The light source that light source makees rangefinder not only reduces cost, and it is more obvious that the bigger cost of power is reduced, and also greatly increases spy
Ranging from.
Based on above-mentioned advantage, because the voltage-current characteristic of LED/light source is almost identical with LD light sources, existing laser ranging
Transmitting, receiving, test, calculating and display system in instrument can be used directly on LED, and it is exactly outgoing uniquely to need improved
The diversing lens device of light, because LED/light source lighting angle is bigger than LD light source, the present invention replaces the LD light sources of emitting parallel light
Diversing lens device is carried out an improvement by the crucial of LED/light source for launching diverging light, and specific improvement project has following several：
Referring to Fig. 3, being the structural representation of diversing lens device 12 in embodiment one, diversing lens device 12 is one
Focus light is changed into single convex lens 12A of collimated light beam, single convex lens 12A is located at the light-emitting window of rangefinder, and LED/light source 11
In single convex lens 12A focal position, to ensure that the light launched from focal position turns into parallel after the refraction of single convex lens
A few part is launched light and is reflected back processing unit 23 as reference light by light beam, in the present embodiment, sampling prism, for
The contrast of reflected light.In the present embodiment, using convex lens structures, the LED/light source of divergence form can just be pooled it is similar with it is sharp
The light of parallel light light, simple in construction, it is easy to realize.
Referring to Fig. 4, being the structural representation of diversing lens device 12 in embodiment two, diversing lens device is double lens
Structure, an including convex lens 121B and a concavees lens 122B, convex lens 121B are close to LED/light source 11, and LED/light source 11 with
The distance between convex lens 121B centers are more than one times of focal length of convex lens, in order to which the light that LED/light source is launched is passed through into convex lens
Mirror 121B is gathered together, meanwhile, concavees lens 122B is placed parallel to convex lens 121B, and close to light-emitting window position, it is recessed
Mirror 122B and convex lens 121B distance is less than convex lens 121B image distance, so, wants to converge in one by convex lens 121B
The light risen becomes the same collimated light beam of similar laser, reaches the mesh as LD light sources further through concavees lens 122B refraction
's.
Referring to Fig. 5, being the structural representation of diversing lens device 12 in embodiment three, diversing lens device is double lens
Structure, including convex lens 121C one big and convex lens 122C one small, big convex lens 121C are close to LED/light source 11, and LED light
The distance between source 11 and big convex lens 121C centers are more than one times of focal length of big convex lens, and reason is as embodiment two, no
It is that concavees lens become small convex lens 122C with part, small convex lens 122C is prevented in close light-emitting window position, and small convex lens
The distance between mirror 122C and big convex lens 121C are more than big convex lens 121C one times of focal length, and big convex lens imaging point just
It is the focus on the left of small convex lens, so, the light converged by big convex lens 121C converges to after imaging point and continues to dissipate,
The light of diverging is by parallel after small convex lens 122C, and big convex lens 121C imaging point is also small convex lens 122C focus position
Put, big convex lens 121C be arranged in parallel with small convex lens 122C.
Referring to Fig. 6, being the structural representation of diversing lens device 12 in example IV, diversing lens device is complete interior anti-
Lens (TIR lens, Total Internal Reflection) 12D is penetrated, LED/light source is mounted on total internal reflection lens 12D
One end, the total internal reflection lens 12D other end fills towards light-emitting window position, and a total internal reflection lens 2D part with sampling
The position put is parallel and overlapping, and total internal reflection lens 12D is a kind of circular light spot that axial symmetry design is provided, and can be both combined into
Many KED turn into array lenses, can also single plus support installed and control light with facilitating, using total internal reflection lens, will dissipate
LED/light source 11 be changed into collimated light beam.
Above is several structures on diversing lens device of the present invention, rangefinder of this several structure in the present embodiment
On be applicable, while being not limited to this several structure, it is therefore an objective to which LED diverging light is changed into directional light.It should be noted that this
LED/light source 11 in invention can be single lamp source, or many lamp sources, multiple LED emission wavelength can be with identical
Can be different, and the connected mode of LED/light source can be series, parallel or connection in series-parallel, the light source of plurality of LEDs composition can be 2
Or more than 2 share one group of diversing lens device 12 or per chips be used alone one group of diversing lens device 12.
In the present embodiment, preferably, LED/light source 11 sends the light or infrared light of red, and dominant wavelength ranges are in 600~2000nm
Between, this is primarily to as the light that LD LASER Light Sources are launched.To ensure low cost, the low-power consumption of LED/light source 11, big work(
Rate and big detection range.In the present embodiment, LED packing forms are not limited, and can be imitative lumen structure, SMD, EMC, COB etc.；
The baseplate material of LED/light source can be ceramics, aluminium, copper, circuit board etc.；LED chip surface applies silica gel or epoxy resin simultaneously
Protective layer, the shape of protective layer can be it is flat can also be arc surface；
In the present invention, it can be adjusted with being further provided with intensity and angle demodulator and frequency on LED/light source 11
Device, the modulating frequency of frequency regulator is 1MHZ to 1000MHZ, and intensity and angle demodulator can be adjusted for regulation manually, machinery
Save or automatically adjust, the angle of regulation range of the beam divergence angle of LED/light source 11 is 0 degree to 5 degree, but is also not limited to adjustable
Section, is also designed to fixed form, is specifically determined with use occasion, in the present invention, and adjustable angle is primarily to adapt to
The size and flatness of target reflecting surface, further to improve the practicality of rangefinder.
Referring to Fig. 7, in the present invention, in order that rangefinder function is more, further can also be gone back in emission system 1
LD light sources are provided with, LD light sources are used with LED/light source by mode selector switch switching, and LD light sources and LED/light source are with touching
The electrical connection of display system is sent out, triggering control is carried out again by trigger 31, it is only necessary to which the signal of a LD light sources access is provided,
The conversion of LED/light source and LD light sources can be achieved, the method belongs to not to be repeated in prior art, the present invention.
In the present invention above-mentioned introduction for impulse method rangefinder, diversing lens device 12 of the invention is surveyed suitable for phase method
Distance meter, ranging phase method instrument difference is the structure of its own, including emission system 1B, reception system 2B, processing system
3B, in the present embodiment, processing system 3B include phase-shift measurement and apart from computing device 31B and signal source 32B, emission system
1 is electrically connected by signal source 32B with phase-shift measurement with apart from computing device 31B, and equally, reception system 2 is also by phase-shift measurement
Electrically connect, be with impulse method rangefinder difference with apart from computing device 31B, emission system 1B include LED/light source 11B,
Diversing lens device 12B, transmitter unit 13B and modulating signal source 14B, the frequency mixing module of modulating signal source and signal source 32B
321B connections, reception system 2B includes focus lens unit 21B, detector 22B, the mixing of detector 22B also with signal source 32B
Module 322B connections, and two groups of frequency mixing modules apart from computing device 31B simultaneously with phase-shift measurement with being analyzed and processed.
Claims (10)
1. a kind of rangefinder based on LED/light source, it is characterised in that including：Emission system, reception system and processing system, institute
State processing system to electrically connect with emission system and reception system respectively, the emission system includes LED/light source and diversing lens are filled
Put, the light that LED/light source is sent is launched by diversing lens device, the reception system includes focus lens unit and detection
Device, detector is connected with processing system, and what focus lens unit reception diversing lens device was launched is reflected back by target object
The light come, is focused on detector, and reflected light information is converted into electric signal and is sent to processing in processing system by detector.
2. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the diversing lens device is one
The light of the individual spot light for sending LED/light source is changed into single convex lens of collimated light beam, and single convex lens are located at going out for rangefinder
Optical port, and LED/light source is located at the focal position of single convex lens, the light that LED/light source is sent is parallel after single convex lens to be projected, institute
State single convex lens and the coaxial setting of LED/light source.
3. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the diversing lens device is double
Lens arrangement, including a convex lens and a concavees lens, convex lens are close to LED/light source, and the center of LED/light source and convex lens
The distance between be more than one times of focal length, the concavees lens are parallel to convex lens, and close to light-emitting window position, the concavees lens with it is convex
The centre distance of lens is less than the image distance of convex lens, and the image space of convex lens is exactly the right survey focal position of concavees lens；It is described
Convex lens, concavees lens and the coaxial setting of LED/light source.
4. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the diversing lens device is double
Lens arrangement, including one big convex lens and a small convex lens, big convex lens are close to LED/light source, and LED/light source and big convex lens
The distance between mirror is more than one times of focal length, and the small convex lens are between light-emitting window position, and small convex lens and big convex lens
Distance be more than the image distances of big convex lens, and the image space of big convex lens is exactly the left survey focal position of small convex lens so that small
Emergent ray on the right side of convex lens is directional light, and the big convex lens and small convex lens are coaxial with LED/light source to be set.
5. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the diversing lens device is complete
Internal reflection lens, the LED/light source is mounted on one end of total internal reflection lens, the other end court of the total internal reflection lens
To light-emitting window position.
6. the rangefinder based on LED/light source according to claim 1-5 any one, it is characterised in that in light-emitting window
Front end, and it is additionally provided with sampler, the sampling dress parallel to the position of diversing lens device and focus lens unit simultaneously
The sampling prism of triangle is set to, sampling prism is a part of overlapping with focus lens unit with diversing lens device respectively.
7. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the LED/light source is single lamp source
Or many lamp sources, and LED/light source sends the light or infrared light of red, dominant wavelength ranges are between 600~2000nm.
8. the rangefinder according to claim 1 based on LED/light source, it is characterised in that be provided with the LED/light source strong
The angle demodulator of adjuster and LED/light source emergent light is spent, the intensity adjustment and angle demodulator are regulation manually, machinery
Adjust or automatically adjust, the angle of regulation range of the beam divergence angle of the LED/light source is 0 degree to 5 degree.
9. the rangefinder according to claim 1 based on LED/light source, it is characterised in that the modulation of the LED light source signal
Frequency is 1MHZ to 1000MHZ.
10. the rangefinder according to claim 1 based on LED/light source, it is characterised in that also set up in the emission system
Have a LD light sources, the LD light sources are used with LED/light source by mode selector switch switching, and LD light sources and LED/light source with place
Reason system is electrically connected.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710251044.5A CN107102314A (en) | 2017-04-18 | 2017-04-18 | Rangefinder based on LED/light source |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710251044.5A CN107102314A (en) | 2017-04-18 | 2017-04-18 | Rangefinder based on LED/light source |
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| CN107102314A true CN107102314A (en) | 2017-08-29 |
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| CN201710251044.5A Pending CN107102314A (en) | 2017-04-18 | 2017-04-18 | Rangefinder based on LED/light source |
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| CN (1) | CN107102314A (en) |
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