CN207216020U - A kind of laser range finder - Google Patents

Abstract

The utility model discloses a kind of laser range finder, belongs to laser ranging technique field.The laser range finder includes laser generator, spectroscope, reflective mirror, isolator, photodetector and concentrator, the laser generator launches laser measurement signal, the spectroscope is positioned over the front end of the laser generator, the laser measurement signal is divided into the first transmission signal and the second transmission signal, second transmission signal described in the mirror reflection, make first transmission signal parallel and in opposite direction with the second transmission signal, the concentrator is by the photopolymerization of multiple directions and is sent to the photodetector.The utility model provides that a kind of application scenario is wider, the laser range finder that measurement accuracy is higher, flexibility is good and inexpensive.

Description

A kind of laser range finder

Technical field

The utility model belongs to laser ranging technique field, is a kind of laser range finder that can realize bidirectional ranging.

Background technology

Laser has the characteristics that good monochromaticjty, high directivity, strong interference immunity.Laser range finder (laser distance Measuring instrument) it is the instrument measured using laser as light source to target range, it has feasibility Well, the characteristics of speed is fast, precision is high.Early stage can use tape measure or tape measure when measuring the distance between two targets, when tested The distance between two targets farther out when, it is necessary to two personal synergics or tape measure or tape measure one end are fixed, then draw respectively Tight tape measure or tape measure and bear against two determinands and could complete to measure, if target to be measured is ceiling or target Between hypertelorism, can lead to not to measure or produce due to that can not tense when tape measure or tape measure larger measurement and miss Difference.In order to solve measurement in inconvenience and improve measurement accuracy, technical staff begin to use laser range finder measure object it Between distance.

Common rangefinder is all unidirectional rangefinder on the market at present, measure two targets apart from when, it is necessary to ranging The reference plane of instrument is close to one of target, then launches laser with the direction in vertical reference face, measures opposite determinand and base The distance between quasi- face.Unidirectional rangefinder work is due to needing to meet above-mentioned particular/special requirement --- and needs are by the reference plane of rangefinder It is close to one of them target to be measured, when particular application measures using limited.Such as between two inclined-planes of measurement loft Horizontal range, measurement datum be the particular application such as tunnel internal width of arc surface, use common unidirectional Laser Measuring Reference plane, which is not easy determination, during distance meter causes measurement error larger, therefore common unidirectional laser range finder is not suitable in such particular field Close and use, use range is restricted.

Patent CN201320216332.4 proposes a kind of two-way laser rangefinder, and the two-way laser rangefinder is treated in measurement two Reference plane need not be determined when surveying the distance between target, the deficiency for solving unidirectional laser range finder, but the two-way laser ranging Instrument three photodiodes of needs could realize the measurement of distance between two targets to be measured, because each photodiode needs Independent drive circuit is wanted, therefore the method hardware circuit that the invention is proposed is more complicated, manufacturing cost is higher, and its valency Lattice are also more expensive, hardly result in and are widely applied.

Following deficiency be present in existing laser range finder：Firstth, unidirectional rangefinder using when need meet some requirements, The unidirectional rangefinder application of special occasion is limited, measurement error is larger；Secondth, existing two-way laser rangefinder solves unidirectional survey To the technical problem of application scenario limitation when distance meter measures, but its hardware circuit is more complicated, manufacturing cost is higher is unfavorable for The popularization and application of laser range finder.

In view of this, a kind of laser range finder how is designed, is industry to eliminate drawbacks described above and deficiency of the prior art An interior person skilled problem urgently to be resolved hurrily.

Utility model content

In order to overcome the technical problem of above-mentioned laser range finder in the prior art, the utility model provides a kind of application The laser range finder that occasion is wide, measurement accuracy is high, flexibility is good and inexpensive.

In order to realize foregoing invention purpose, the utility model discloses a kind of laser range finder, including laser generator, point Light microscopic, reflective mirror, isolator, photodetector and concentrator, the laser generator launch laser measurement signal, the light splitting Mirror is positioned over the front end of the laser generator, and the laser measurement signal is divided into the first transmission signal and the second transmitting is believed Number, the second transmission signal described in the mirror reflection makes first transmission signal parallel with the second transmission signal and direction On the contrary, the concentrator is by the photopolymerization of multiple directions and is sent to the photodetector.

Further, the angle of the spectroscope and the reflective mirror is 90 degree.

Further, the isolator is respectively placed in where first transmission signal and second transmission signal In two light paths.

Further, the isolator is electric control optical switch.

Further, the concentrator is optical lens module or optical fiber component.

Further, the angle of the spectroscope and the laser measurement signal is 45 degree, the reflective mirror and described the The angle of two transmission signals is 45 degree.

Further, the isolator is that liquid crystal light valve or electric-controlled mechanical switch.

Further, the optical lens module includes reflecting element and lens group, and the reflecting element reflection is tested Signal that target reflects simultaneously passes it to the lens group, and photodetector is focused on through the lens group.

Further, described optical fiber component is multichannel optical fiber, and the multichannel optical fiber receives multichannel input signal, defeated Go out signal all the way.

Further, the angle of two reflectings surface of the reflecting element is 90 degree.

Compared to prior art, technical scheme provided by the utility model has advantages below：Firstth, compared to existing Unilateral laser range finder in technology, this laser range finder need not successfully solve existing unilateral laser ranging against target to be measured It is not easy to determine the technical problem of reference plane in instrument measurement process, application scenario is wider, measurement accuracy is higher, using more flexible；Phase Than being required for the two-way laser ranging of independent drive circuit in three photodiodes of existing needs, each photodiode Instrument, one group of emitting laser is used only for the laser range finder of the application and photodiode can realizes two-way non-contact survey Away from manufacturing cost is low, easy to spread.

Brief description of the drawings

Fig. 1 is the operation principle schematic diagram of laser range finder provided by the utility model；

Fig. 2 is the operation principle schematic diagram of concentrator provided by the utility model.

Embodiment

Describe specific embodiment of the utility model in detail below in conjunction with the accompanying drawings.In the explanation of specific examples below, In order to clearly show that structure and working method of the present utility model, will be described by many Directional words, but should By the Word Understanding such as "front", "rear", "left", "right", " outer ", " interior ", " outside ", " inside ", " axial direction ", " radial direction " for convenience of use Language, and it is not construed as word of limitation.

In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this Utility model, it is not used to limit the utility model.

If Fig. 1 is a kind of structural representation of laser range finder provided by the utility model, the laser range finder is specific Including：Laser generator 1, spectroscope 2, speculum 3, isolator 4, isolator 5, concentrator 6 and photodetector 7.

The wherein inside of laser generator 1 includes laser drive circuit, laser tube and transmitting focusing lens, laser drive circuit Laser tube is driven to produce modulating lasering beam, the laser beam is changed into collimated light beam a after transmitting focusing lens；Spectroscope 2 is placed In the front end of laser generator, 45 degree of placements, laser signal a is divided into b and c two-way；Reflective mirror 3 and optical signal c is put into 45 degree Put, reflected light signal c, make optical signal b parallel with c directions opposite；Isolator 4,5 in Laser emission light path, controls respectively Light beam b and c conducting and cut-off, it is that liquid crystal light valve or electric-controlled mechanical switch, and its break-make is controlled by MCU；Laser range finder Operation principle be：Light beam b and light beam c is formed by spectroscope 2 by laser generator 1 emitting parallel light beam a, light beam a, when When isolator 4 turns on, isolator 5 ends, and light beam b is run into after object reflects by the isolator 4 of conducting forms light beam d, light Beam d pools light beam f by concentrator 6, and light beam f is radiated on photodetector 7, and photodetector 7 changes beam signal Into electric signal, distance measurement function is realized；When isolator 5 turns on, isolator 4 ends, and launches isolators 5 of the light beam c by conducting Light beam e is formed after running into object reflection；Light beam e pools light beam f by concentrator 6, and light beam f is radiated at photodetector 7 On, beam signal is converted into electric signal by photodetector 7, realizes distance measurement function.Wherein concentrator 6 can be optical lens group Part or optical fiber component.

Concentrator 6 described in the utility model, its preferred embodiment, should as shown in Fig. 2 be optical lens module structure Structure top is the reflecting element 6-1 that two reflecting surface angles are 90 °, axis and lens subassembly 6-2 optical axis coincidences, by measured target The light beam d and e reflected, lens subassembly 6-2 surfaces, wherein photodetector 7 are reached after reflecting element 6-1 reflections Positioned at lens subassembly 6-2 focal position, laser beam is focused on after lens subassembly 6-2 on photodetector 7.

Concentrator 7 described in the utility model can also be optical fiber component, defeated all the way using multichannel optical fiber, multipath reception Go out, laser beam d and e is transferred on photodetector 7.

Unless otherwise instructed, it is herein presented be similar to " first ", the qualifier of " second " do not mean that it is suitable to the time The restriction of sequence, quantity or importance, and be used for the purpose of a technical characteristic in the technical program and another technology Feature is mutually distinguished.Similarly, the herein presented qualifier similar to " one " does not mean that the restriction to quantity, but describes The technical characteristic not occurred above.Similarly, occur herein before number be similar to " about ", " approx " Modifier generally comprises this number, and its specific implication should combine context meaning and understand.Similarly, only have specific The noun of quantity measure word modification, otherwise should be regarded as including plural form again comprising singulative, in the technology herein The individual technical characteristic of odd number can be included in scheme, a plurality of technical characteristics can also be included.

Simply preferred embodiment of the present utility model described in this specification, above example is only illustrating this The technical scheme of utility model rather than to limitation of the present utility model.All those skilled in the art are logical according to design of the present utility model The available technical scheme of logical analysis, reasoning, or a limited experiment is crossed, all should be within the scope of the utility model.

Claims (9)

1. a kind of laser range finder, it is characterised in that including laser generator, spectroscope, reflective mirror, isolator, photodetection Device and concentrator, the laser generator launches laser measurement signal, before the spectroscope is positioned over the laser generator End, the laser measurement signal is divided into the first transmission signal and the second transmission signal, the second hair described in the mirror reflection Signal is penetrated, makes that first transmission signal and second transmission signal are parallel and in opposite direction, and the isolator is placed respectively In in two light paths where first transmission signal and second transmission signal, the concentrator is by the light of multiple directions It polymerize and is sent to the photodetector.

2. laser range finder according to claim 1, it is characterised in that the angle of the spectroscope and the reflective mirror is 90 degree.

3. laser range finder according to claim 1, it is characterised in that the isolator is electric control optical switch.

4. laser range finder according to claim 1, it is characterised in that the concentrator is optical lens module or light Fine component.

5. laser range finder according to claim 2, it is characterised in that the spectroscope and the laser measurement signal Angle is 45 degree, and the reflective mirror and the angle of second transmission signal are 45 degree.

6. laser range finder according to claim 3, it is characterised in that the isolator is liquid crystal light valve or electric-controlled mechanical Switch.

7. laser range finder according to claim 4, it is characterised in that the optical lens module include reflecting element and Lens group, the reflecting element reflects the signal reflected by measured target and passes it to the lens group, through described Lens group focuses on the photodetector.

8. laser range finder according to claim 4, it is characterised in that the optical fiber component is multichannel optical fiber, described Multichannel optical fiber receives multichannel input signal, exports signal all the way.

9. laser range finder according to claim 7, it is characterised in that the angle of two reflectings surface of the reflecting element is 90 degree.