CN105676229A - Laser range finder structure applied to low range - Google Patents
Laser range finder structure applied to low range Download PDFInfo
- Publication number
- CN105676229A CN105676229A CN201610182741.5A CN201610182741A CN105676229A CN 105676229 A CN105676229 A CN 105676229A CN 201610182741 A CN201610182741 A CN 201610182741A CN 105676229 A CN105676229 A CN 105676229A
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- laser
- measured target
- aid
- unit
- corner cube
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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
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/08—Systems determining position data of a target for measuring distance only
-
- 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
- G01S7/481—Constructional features, e.g. arrangements of optical elements
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Electromagnetism (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The invention discloses a laser range finder structure applied to a low range, which comprises a laser device, a right angle prism, a single-sided mirror, and either a laser high reflection mirror or a bimirror, wherein the laser device is internally integrated with a laser transmitting unit, a laser receiving unit and a data processing unit. According to the structure of the invention, through reflection or refraction of the right angle prism, the single-sided mirror, the laser high reflection mirror or the bimirror, a laser signal path is changed, and the problems that the laser device is inconvenient to mount due to limited space in the Y direction and the laser range finder is low in precision and large in errors due to small to-be-found range can be effectively solved; and the structure is simple, the cost is low, the mounting is convenient, and the low-range laser range finder precision is improved.
Description
Technical field
The present invention relates to laser measuring technique field, for installation environment apart from limited and that required precision is high close-in measurement, relate to a kind of laser ranging structure suitable in lower range.
Background technology
Laser has advantages such as high directivity, brightness is high, monochromaticity is good, coherence is good, and it is wide to have certainty of measurement height, scope, it is achieved non-cpntact measurement, is widely used in range finding field. Laser ranging system utilizes the laser substantially invariable characteristic of spread speed in atmosphere, typically via the laser signal measurement realizing distance two-way time in target range to be measured. In recent years, along with the development of laser technology, electronic technology and computer technology, laser ranging technique obtains quick development, and laser ranging system based on this develops towards the direction of digitized, automatization, low cost and miniaturization.
In lower range measurement process, existing laser ranging system uses general counter chip (clocking capability) to be difficult to accurate timing, causes bigger calculating error occur.
Additionally, in some applied environment, owing to mounting condition limits, as narrow and small in installing space, installation inconvenience etc., causes existing laser ranging system not easily to install so that range accuracy is limited.
Therefore, existing laser ranging system, within the scope of lower range compared with intermediate range scope: range accuracy is low, error is big. So, the high-precision laser range-finding structure developing a kind of lower range has practical significance.
Summary of the invention
It is an object of the invention to provide a kind of laser ranging structure suitable in lower range, solve prior art in lower range laser ranging, cause calculating time precision low due to the restriction of structure setting and installation environment is apart from limited problem.
The technical solution used in the present invention is:
Mode 1,
A kind of laser ranging structure suitable in lower range, including laser aid and a corner cube prism, laser aid has been internally integrated laser emission element, laser pick-off unit and data processing unit, the laser emitting direction of laser aid and measured target reflection direction are vertically arranged, the cross section of corner cube prism is isosceles right triangle, the inclined-plane of corner cube prism is outwardly, one right-angle side of corner cube prism is relative with laser aid, and the midpoint, inclined-plane of corner cube prism is positioned at same straight line with laser emission element emitter, laser pick-off unit receptor;Another right-angle side of corner cube prism is relative with measured target, and midpoint, corner cube prism inclined-plane is positioned at same straight line with measured target's center.
Mode 2,
A kind of laser ranging structure suitable in lower range, including laser aid and a single-surface mirror, laser aid has been internally integrated laser emission element, laser pick-off unit and data processing unit, the laser emitting direction of laser aid and measured target reflection direction are vertically arranged, the emergent light of laser emission element reflexes on measured target reflection face by single-surface mirror, and the measured reflection light on target reflection face reflexes in laser pick-off unit through single-surface mirror again.
Mode 3,
A kind of laser ranging structure suitable in lower range, including laser aid and a laser high reflective mirror, laser aid has been internally integrated laser emission element, laser pick-off unit and data processing unit, the laser emitting direction of laser aid and measured target reflection direction be arranged in parallel, laser high reflective mirror is arranged on the folding line between laser aid and measured target, the incident laser of laser emission element impinges upon on the reflecting surface of measured target by emergent light after the multiple reflections in laser high reflective mirror, and return laser light receives in unit after the reflection light multiple reflections in laser high reflective mirror on measured target reflection face.
Mode 4,
A kind of laser ranging structure suitable in lower range, including laser aid and a bimirror, laser aid has been internally integrated laser emission element, laser pick-off unit and data processing unit, the laser emitting direction of laser aid and measured target reflection direction be arranged in parallel, bimirror is arranged on the folding line between laser aid and measured target, the incident laser of laser emission element impinges upon on the reflecting surface of measured target by emergent light after the multiple reflections in bimirror, and return laser light receives in unit after the reflection light multiple reflections in bimirror on measured target reflection face.
The invention has the beneficial effects as follows, including the following aspects:
1) by using corner cube prism, change the light path of laser signal, solve installing space one direction apart from restricted problem;
2) by changing the light path of turning back of laser signal, lower range is measured reality and measures apart from elongated, thus, reduce the required precision to tally function chip, improve lower range certainty of measurement and error;
3) simple in construction, cost are low, just can realize, simply by increasing a corner cube prism, the function that precision improves, be especially suitable for lower range high-precision laser range-finding.
Accompanying drawing explanation
Fig. 1 is the typical laser ranging system scheme of installation of existing one;
A kind of laser ranging structure that Fig. 2 is the present invention arranges schematic diagram;
The another kind of laser ranging structure that Fig. 3 is the present invention arranges schematic diagram.
In figure, 1. laser aid, 2. laser illumination path, 3. corner cube prism, 4. target, 5. refraction by prism light path, 6. laser high reflective mirror, 7. laser equipment, 8. laser emission element, 9. laser pick-off unit.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, it it is a kind of typical laser ranging mounting structure of prior art, including conventional laser equipment 7, laser equipment 7 be internally integrated laser emission element 8 and laser pick-off unit 9, measured target 4 is positioned on the laser illumination path direction of laser equipment 7, certain moment starts, measured target 4 is launched laser signal by laser emission element 8, laser pick-off unit 9 receives the echo laser signal from measured target 4, calculate laser signal and arrive the time needed for measured target 4 return laser light reception unit 9 from laser emission element 8s, thus calculate testing distance d, it is t that pulse signal comes and goes required time, the aerial spread speed of laser is c, then haveVisible, the computational accuracy of time t determines the precision of testing distance d.In lower range measurement process, owing to range is only small, existing laser distance measurement method uses general counter chip (clocking capability) to be difficult to accurately calculate the time, cause that bigger calculating error occurs, therefore, the counter chip of higher precision can only be required, thus adding equipment cost.
When reality is measured, if the testing distance N of measured target 4 is positioned in Y-direction, due to limited space in the Y direction, the installation of laser aid 1 is very inconvenient, is substantially difficult to carry out; And owing to testing distance is little, the relatively middle range of existing laser ranging system precision is low, arranges deployment cost restricted (mainly the cost of timing device), now, structure and mounting means thereof that the employing present invention is following measure, and just have better certainty of measurement.
As shown in Figure 2, the laser ranging structure of the present invention is, including laser aid 1 and corner cube prism 3, the laser emitting direction of laser aid 1 and measured target 4 reflection direction are vertically arranged, laser aid 1 has been internally integrated laser emission element 8, laser pick-off unit 9 and data processing unit three part, the cross section of corner cube prism 3 is isosceles right triangle, the inclined-plane of corner cube prism 3 is outwardly, one right-angle side of corner cube prism 3 is relative with laser aid 1, and laser emission element 8 emitter of the midpoint, inclined-plane of corner cube prism 3 and laser aid 1, laser pick-off unit 9 receptor is arranged in same straight line (figure along X-direction), another right-angle side of corner cube prism 3 is relative with measured target 4, and midpoint, corner cube prism 3 inclined-plane and measured target 4 are centrally located at same straight line (along Y direction in figure).
The above-mentioned structure measurement principle of the present invention is,
After laser aid 1 and corner cube prism 3 calibration in advance, the laser emission element 8 in laser aid 1 launches laser pulse signal, triggers signal simultaneously and makes timing circuit that timing pulse to be counted; Laser signal is totally reflected to measured target 4 by corner cube prism 3, and through the reflection of measured target 4 reflecting surface, the reflection light then reflected is totally reflected again by corner cube prism 3, is received by laser pick-off unit 9; Then, data processing unit converts optical signals to electric impulse signal, stops the control signal of counting after amplified shaping as enumerator; Finally, data processing unit reads umber of pulse n from enumerator, in conjunction with timing pulse period tau, and then calculates total distance S of laser process;
Corner cube prism 3 is arranged on the vertical intersection of both measured target 4 and laser aid 1 axis extended line, and measured target 4 is positioned at Y-direction, then the Y-direction testing distance of measured target 4 is N; Laser aid 1 is fixedly mounted on X-direction, and the fixed range of the midpoint, inclined-plane of corner cube prism 3 and laser emission element 8 emitter of laser aid 1, laser pick-off unit 9 receptor is M; Laser total reflection one way distance in corner cube prism 3 is L, then have N=S/2 M L.
The work process of said structure of the present invention is:
Step 1, according to measured target 4 position, installs according to aforesaid locations of structures put in place laser aid 1, corner cube prism 3, it is determined that fixed range M and the total reflection one way distance L in corner cube prism 3, and calibration of laser device 1;
Step 2, starts laser aid 1, and the laser emission element 8 in laser aid 1 launches laser pulse signal, triggers signal simultaneously and makes the timing circuit in data processing unit that timing pulse to be counted;
Step 3, laser signal enters corner cube prism 3 by laser illumination path 2, total reflection by corner cube prism 3 inclined-plane, measured target 4 is arrived through refraction by prism light path 5, after the reflection of measured target 4 reflecting surface, echo, again through the total reflection of corner cube prism 3, is received by laser pick-off unit 9;
Step 4, the optical signal received is converted to electric impulse signal by data processing unit, stops connecing the control signal of counting as enumerator after amplified shaping;
Step 5, data processing unit reads umber of pulse n from enumerator, in conjunction with timing pulse period tau, and then calculates total distance S of laser signal traversal; The testing distance N=S/2 M L of then measured target 4.
Present invention additionally comprises but not terminate in following structure and arrange:
Corner cube prism 3 replacing with a single-surface mirror and realizes angle of incidence 45 ° and the laser total reflection of the angle of emergence 45 °, same realization is totally reflected change laser signal light path, it is achieved above-mentioned range finding purpose. Namely the emergent light of laser aid 1 reflexes on measured target 4 reflecting surface by single-surface mirror, and the measured reflection light on target 4 reflecting surface reflexes in laser pick-off unit 9 through single-surface mirror again. Like this, measure distance calculating formula and need corresponding adjustment.
As shown in Figure 3, the device changing laser signal light path may be arranged as laser high reflective mirror 6, the mounting means of laser high reflective mirror 6 and laser aid 1 is, the laser emitting direction of laser aid 1 and measured target 4 reflection direction be arranged in parallel, laser high reflective mirror 6 is arranged on the folding line between laser aid 1 and measured target 4, the incident laser of laser aid 1 impinges upon on the reflecting surface of measured target 4 by emergent light after the multiple reflections in laser high reflective mirror 6, and after the reflection light multiple reflections in laser high reflective mirror 6 on measured target 4 reflecting surface in the laser pick-off unit 9 of return laser light device 1. like this, distance value is measured accordingly by corresponding calculating formula.
Laser high reflective mirror 6 may be replaced by two bimirrors be arrangeding in parallel, realize above-mentioned range finding purpose, bimirror is arranged on the folding line between laser aid 1 and measured target 4, the incident laser of laser aid 1 is impinged upon on the reflecting surface of measured target 4 by emergent light after the multiple reflections in bimirror, and after the reflection light multiple reflections in bimirror on measured target 4 reflecting surface in the laser pick-off unit 9 of return laser light device 1. Like this, measure distance calculating formula and need corresponding adjustment.
Claims (4)
1. the laser ranging structure being applicable to lower range, including laser aid (1) and a corner cube prism (3), laser aid (1) has been internally integrated laser emission element (8), laser pick-off unit (9) and data processing unit, it is characterised in that:
The laser emitting direction of laser aid (1) and measured target (4) reflection direction are vertically arranged, the cross section of corner cube prism (3) is isosceles right triangle, the inclined-plane of corner cube prism (3) is outwardly, one right-angle side of corner cube prism (3) is relative with laser aid (1), and the midpoint, inclined-plane of corner cube prism (3) is positioned at same straight line with laser emission element (8) emitter, laser pick-off unit (9) receptor; Another right-angle side of corner cube prism (3) is relative with measured target (4), and corner cube prism (3) midpoint, inclined-plane is centrally located at same straight line with measured target (4).
2. the laser ranging structure being applicable to lower range, including laser aid (1) and a single-surface mirror, laser aid (1) has been internally integrated laser emission element (8), laser pick-off unit (9) and data processing unit, it is characterised in that:
The laser emitting direction of laser aid (1) and measured target (4) reflection direction are vertically arranged, the emergent light of laser emission element (8) reflexes on measured target (4) reflecting surface by single-surface mirror, and the measured reflection light on target (4) reflecting surface reflexes in laser pick-off unit (9) through single-surface mirror again.
3. the laser ranging structure being applicable to lower range, including laser aid (1) and a laser high reflective mirror (6), laser aid (1) has been internally integrated laser emission element (8), laser pick-off unit (9) and data processing unit, it is characterised in that:
The laser emitting direction of laser aid (1) and measured target (4) reflection direction be arranged in parallel, laser high reflective mirror (6) is arranged on the folding line between laser aid (1) and measured target (4), the incident laser of laser emission element (8) impinges upon on the reflecting surface of measured target (4) by emergent light after the multiple reflections in laser high reflective mirror (6), and return laser light receives in unit (9) after the multiple reflections that the reflection light on measured target (4) reflecting surface is in laser high reflective mirror (6).
4. the laser ranging structure being applicable to lower range, including laser aid (1) and a bimirror, laser aid (1) has been internally integrated laser emission element (8), laser pick-off unit (9) and data processing unit, it is characterised in that:
The laser emitting direction of laser aid (1) and measured target (4) reflection direction be arranged in parallel, bimirror is arranged on the folding line between laser aid (1) and measured target (4), the incident laser of laser emission element (8) is impinged upon on the reflecting surface of measured target (4) by emergent light after the multiple reflections in bimirror, and after the reflection light multiple reflections in bimirror on measured target (4) reflecting surface, return laser light receives in unit (9).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610182741.5A CN105676229B (en) | 2016-03-28 | 2016-03-28 | A kind of laser ranging structure suitable for lower range |
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| CN201610182741.5A CN105676229B (en) | 2016-03-28 | 2016-03-28 | A kind of laser ranging structure suitable for lower range |
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| CN105676229A true CN105676229A (en) | 2016-06-15 |
| CN105676229B CN105676229B (en) | 2019-03-22 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107153183A (en) * | 2017-07-18 | 2017-09-12 | 丹阳市瑞华光学元件有限公司 | A kind of vehicle-mounted laser rangefinder |
| CN107607961A (en) * | 2017-09-18 | 2018-01-19 | 西安理工大学 | A kind of phase-shift laser range-finder and method based on FPGA |
| CN108279422A (en) * | 2018-04-28 | 2018-07-13 | 中国农业科学院棉花研究所 | A kind of measuring device of crop plant height |
| CN109186470A (en) * | 2018-11-06 | 2019-01-11 | 南京林业大学 | A kind of mounting distance can automatic adjusument laser displacement sensor |
| CN111711749A (en) * | 2020-06-01 | 2020-09-25 | Oppo（重庆）智能科技有限公司 | Laser ranging device, camera module, electronic equipment and control method |
| CN112888959A (en) * | 2019-09-30 | 2021-06-01 | 深圳市大疆创新科技有限公司 | Measuring method and system for measuring range of laser range finder and storage medium |
| CN112946673A (en) * | 2021-01-29 | 2021-06-11 | 上海睿钰生物科技有限公司 | Laser ranging method, focusing method, laser ranging system and focusing system |
| WO2022161123A1 (en) * | 2021-01-29 | 2022-08-04 | 上海睿钰生物科技有限公司 | Laser distance measuring method, focusing method, laser distance measuring system, focusing system, and auto-focusing analysis device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107153183A (en) * | 2017-07-18 | 2017-09-12 | 丹阳市瑞华光学元件有限公司 | A kind of vehicle-mounted laser rangefinder |
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| CN108279422A (en) * | 2018-04-28 | 2018-07-13 | 中国农业科学院棉花研究所 | A kind of measuring device of crop plant height |
| CN109186470A (en) * | 2018-11-06 | 2019-01-11 | 南京林业大学 | A kind of mounting distance can automatic adjusument laser displacement sensor |
| CN112888959A (en) * | 2019-09-30 | 2021-06-01 | 深圳市大疆创新科技有限公司 | Measuring method and system for measuring range of laser range finder and storage medium |
| CN111711749A (en) * | 2020-06-01 | 2020-09-25 | Oppo（重庆）智能科技有限公司 | Laser ranging device, camera module, electronic equipment and control method |
| CN112946673A (en) * | 2021-01-29 | 2021-06-11 | 上海睿钰生物科技有限公司 | Laser ranging method, focusing method, laser ranging system and focusing system |
| WO2022161123A1 (en) * | 2021-01-29 | 2022-08-04 | 上海睿钰生物科技有限公司 | Laser distance measuring method, focusing method, laser distance measuring system, focusing system, and auto-focusing analysis device |
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