CN216792443U - Laser distance measuring device - Google Patents
Laser distance measuring device Download PDFInfo
- Publication number
- CN216792443U CN216792443U CN202123415230.9U CN202123415230U CN216792443U CN 216792443 U CN216792443 U CN 216792443U CN 202123415230 U CN202123415230 U CN 202123415230U CN 216792443 U CN216792443 U CN 216792443U
- Authority
- CN
- China
- Prior art keywords
- laser
- detector
- receiving lens
- positions
- distance measuring
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Optical Distance (AREA)
- Optical Radar Systems And Details Thereof (AREA)
Abstract
The utility model provides a laser distance measuring device, which relates to a triangulation laser distance measuring technology and comprises the following steps: the laser device is used for emitting laser to irradiate the object to be measured; the receiving lens can adjust the position relative to the laser, and is used for focusing diffuse reflection light reflected by the object to be detected irradiated by the laser and forming light spots on the detector; and the detector is used for detecting the position of the light spot on the detector. This application can adjust the position of receiving lens for the laser instrument when the diffuse reflection light is sheltered from, changes receiving lens's incident angle, makes the diffuse reflection light that is not sheltered from by receiving lens focus, forms the facula on the detector to solve the problem that the diffuse reflection light is sheltered from, ensure measuring precision.
Description
Technical Field
The utility model relates to a triangulation laser ranging technology, in particular to a laser ranging device.
Background
The triangulation laser ranging technology is a method for obtaining the distance between an object to be measured and a laser ranging device through the geometrical relation among diffuse reflection light, the object to be measured and the laser ranging device based on the diffuse reflection principle. The method has the advantage of higher precision in short-distance measurement. However, the triangulation laser ranging device relies on diffuse reflection light on the surface of the object to be measured, and when the diffuse reflection light is blocked and cannot be received by the laser ranging device, the triangulation laser ranging device cannot complete ranging. The problem that distance measurement cannot be completed due to the fact that diffuse reflection light is shielded is solved by arranging a plurality of groups of laser receivers in the conventional triangular laser distance measuring device. However, the increase of the laser receivers increases the volume and the cost of the laser distance measuring device, and the use rate of a plurality of groups of laser receivers is low in use, which causes waste.
SUMMERY OF THE UTILITY MODEL
To the deficiency of the above prior art, the present application provides a laser rangefinder, the position of adjustable receiving lens prevents to be sheltered from because of the diffuse reflection and produces measuring error.
In order to achieve the above object, the present application provides a laser ranging apparatus, including:
the laser is used for emitting laser to irradiate the object to be detected;
the receiving lens can adjust the position relative to the laser and is used for focusing diffuse reflection light reflected by the laser irradiated on the object to be detected and forming light spots on the detector;
and the detector is used for detecting the position of the light spot on the detector.
This application has adopted above-mentioned technical scheme, makes it have following beneficial effect:
when the diffuse reflection light is shielded, the position of the receiving lens relative to the laser can be adjusted, the incident angle of the receiving lens is changed, and the non-shielded diffuse reflection light irradiates the receiving lens, so that the distance measurement is completed, and the measurement error caused by shielding of the diffuse reflection light is reduced. This application simple structure, the processing ease need not to set up multiunit laser receiver, has reduced laser rangefinder volume and cost, reduce cost.
Drawings
FIG. 1 is a schematic diagram of triangulation laser ranging in one embodiment of the present application;
FIG. 2 is a schematic illustration of diffuse reflection in an embodiment of the present application;
FIG. 3 is a diagram of an optical path when a portion of the diffusely reflected light is blocked according to an embodiment of the present application;
FIG. 4 is a diagram of an optical path after moving a receiving lens according to an embodiment of the present application;
FIG. 5 is a schematic diagram of Samm's Law in one embodiment of the present application.
Wherein, 1: a laser; 2: an object to be tested; 3: a receiving lens; 4: and a detector.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that all directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly, and the connection may be a direct connection or an indirect connection.
In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
As shown in fig. 1, the principle of triangulation laser ranging is demonstrated. As shown in fig. 2, the laser beam is irradiated on the object 2 to cause diffuse reflection, and the diffuse reflection light is isotropic and can be irradiated in various directions. Part of the diffusely reflected light that can impinge on the receiving lens 3 is focused by the receiving lens 3 to form a light spot on the detector 4. And taking the plane where the original position of the object 2 is located as a reference plane, moving the object 2 to be measured to the laser ranging device, and thus obtaining another light spot on the detector 4. The detector 4 obtains the distance between the measuring centers of the two light spots, and the distance between the object 2 to be measured and the laser ranging device can be obtained according to the geometric relationship.
In one embodiment, there is provided a laser ranging apparatus including:
the laser 1 is used for emitting laser to irradiate the object 2 to be measured.
And a receiving lens 3 capable of adjusting a position relative to the laser 1, for focusing the diffuse reflection light reflected by the object 2 irradiated with the laser light to form a light spot on the detector 4.
And a detector 4 for detecting the position of the light spot on the detector 4.
The adjusting the position relative to the laser 1 includes, but is not limited to, moving the receiving lens 3 toward the laser 1, or rotating the receiving lens 3 around the laser 1 with the laser 1 as a center.
As shown in fig. 3, the optical path diagram is a diagram when a part of the diffuse reflected light is blocked. When the object 2 has a convex edge, the diffuse reflection light generated by the laser irradiated on the object 2 is blocked by the convex edge, so that a part of the receiving lens 3 cannot receive the diffuse reflection light. Because part of the diffuse reflected light is missing, it causes the reception lens 3 to shift the measurement center of the light spot formed on the detector 4. Therefore, the laser ranging device is prone to generate measurement errors after the diffuse reflection light is blocked.
As shown in fig. 4, an optical path diagram after the reception lens 3 is moved. In the embodiment, the receiving lens 3 is moved towards the laser 1, the included angle between the receiving lens 3 and the laser is reduced, and the unhindered diffuse reflection light irradiates the receiving lens 3, so that the problem that the diffuse reflection light is blocked is solved, and the measurement error caused by the fact that the diffuse reflection light is blocked is reduced.
In this embodiment, by adjusting the position of the receiving lens 3 relative to the laser 1, the receiving lens 3 can avoid blocking the reception of the diffuse reflected light, thereby forming a spot on the detector 4. The receiving lens 3 is moved to replace a plurality of groups of laser receivers, so that the volume and the manufacturing cost of the laser ranging device are reduced, and the cost is reduced.
In one embodiment, a laser distance measuring device is provided, the receiving lens 3 can move towards the laser 1, and the detector 4 can move synchronously with the receiving lens 3, so that the distance between a light spot and the detection edge of the detector 4 is larger than or equal to a preset distance.
The detector 4 has a detection edge, and when the position of the light spot exceeds the detection edge, the detector 4 cannot detect the position of the light spot.
When the receiving lens 3 is moved towards the laser 1, the position of the spot formed on the receiver is also moved accordingly. In order to keep the light spot within the detection range of the detector 4, the detector 4 and the receiving lens 3 need to move synchronously, so that the distance between the light spot and the detection edge of the detector 4 is greater than or equal to a preset distance, and the light spot is kept on the detector 4.
The synchronous movement of the detector 4 can prevent the light spot from moving out of the detection edge of the detector 4 due to the overlarge moving distance of the receiving lens 3 in the measuring process, so that the moving range of the receiving lens 3 can be enlarged, and the anti-blocking capability is enhanced.
In one embodiment, a laser distance measuring device is provided, wherein at least one of the receiving lens 3 and the detector 4 can rotate, so that the lens plane of the receiving lens 3, the imaging plane of the detector 4 and the shooting plane of the object 2 to be measured intersect on the same straight line.
In the process of using the triangulation method for ranging, the object to be measured 2 needs to be moved, and in order to enable the object to be measured 2 before and after movement to form clear light spots on the detector 4, the lens plane of the receiving lens 3, the imaging plane of the detector 4 and the shooting plane of the object to be measured 2 need to meet the requirements of the schem's law. As shown in fig. 5, a schematic diagram of schemer's law. The plane where the positions of the object 2 before and after movement are located is the shooting plane of the object 2, and the shooting plane is parallel to the movement direction of the object 2. The laser light in this embodiment is on the object plane of the object 2.
In the embodiment, at least one of the receiving lens 3 and the detector 4 is rotated, so that the lens plane of the receiving lens 3, the imaging plane of the detector 4 and the shot plane of the object 2 to be measured meet the requirement of the schemer's law, and the measurement accuracy is improved.
In one embodiment, a laser distance measuring device is provided, on which a plurality of first positions of the receiving lens 3 and a plurality of second positions of the detector 4 are preset, and the first positions and the second positions correspond to each other one by one. The receiving lens 3 can adjust the position to any one first position, and the detector 4 adjusts the position to a corresponding second position along with the receiving lens 3, so that the lens plane of the receiving lens 3, the imaging plane of the detector 4 and the shooting plane of the object 2 to be measured intersect on the same straight line.
Wherein, the first position on the laser ranging device can be provided with two or more, preferably, the first position can be provided with three or five. The number of second position settings is the same as the number of first position settings. The first position and the second position are in one-to-one correspondence, so that the distance between the light spot and the detection edge of the detector 4 is greater than or equal to a preset distance, and the light spot can be detected by the detector 4. The angle of the first preset included angle between each first position and the laser is different, and the second preset included angle between the second position and the laser is matched with the corresponding first included angle, so that the lens plane of the receiving lens 3, the imaging plane of the detector 4 and the shooting plane of the object to be measured 2 meet the requirements of the Schlemm's law.
The triangulation distance measurement is to calculate the distance between the object 2 to be measured and the laser 1 by using a geometric relationship, and the distance between the receiving lens 3 and the detector 4 in the direction of the main optical axis needs to be determined in the calculation process. When the problem that the diffuse reflection light is blocked is solved, the distance between the receiving lens 3 and the detector 4 is changed. It is therefore necessary to determine the distance parameters of the receiving lens 3 and the detector 4 at each position. And the distance parameter determination generally needs calibration, which greatly increases the workload and the calculation complexity during ranging.
In the embodiment, the limited first positions and the limited second positions are set, and only the distance parameters corresponding to the preset first positions and the preset second positions need to be calibrated, so that the calibration times can be reduced, and the workload is reduced. The laser ranging device provided by the embodiment can solve the problem that diffuse reflection light is blocked, reduces the calibration times and reduces the workload.
In one embodiment, a laser ranging device is provided, which further comprises a storage medium for storing position parameters of a plurality of first positions and a plurality of second positions.
The position parameters represent parameters used for calculating the distance between the laser and the object to be measured in the distance measuring process, and include but are not limited to the distances between the first position and the laser, and the included angles between the first position and the laser, between the second position and the laser. The process of acquiring the position parameters is as follows: adjusting the position of the receiving lens 3 to each first position, and adjusting the position of the detector 4 to a corresponding second position; then calibration is carried out in sequence, and the corresponding position parameters are stored in the storage medium. The corresponding location parameters stored in the storage medium can be called up during the distance measurement.
In one embodiment, there is provided a laser range finder, wherein the receiving lens 3 is an aspherical mirror for focusing the diffusely reflected light at different first positions to form a light spot on the detector 4.
When the receiving lens 3 and the detector 4 are at different positions, the included angle between the receiving lens 3 and the detector 4 is different, so that the problem of image blurring can be caused by using a spherical mirror. The embodiment uses the aspherical mirror to enable the receiving lens 3 at different positions to form clear light spots on the detector 4, thereby improving the measurement accuracy.
In one embodiment, a laser distance measuring device is provided, wherein a plurality of light inlets corresponding to a plurality of first positions are arranged on the laser distance measuring device, and a switch is arranged on each of the plurality of light inlets.
The diameter of the light inlet hole can be set according to the receiving lens 3, the light inlet hole with a proper size can prevent the interference of stray light, and the measurement precision is improved. The positions of the light inlet holes correspond to the first positions one by one. The switch arranged on the light inlet can prevent the light leakage of other light inlets when the receiving lens 3 is at different positions. A plane mirror can be arranged on the light inlet hole to block dust and stray light. Preferably, a narrow-band filter is installed on the light inlet hole.
In one embodiment, a laser distance measuring device is provided, which is provided with a first moving mechanism on which a receiving lens 3 is mounted and a second moving mechanism on which a detector 4 is mounted; the plurality of first positions are preset positions on a motion path of the first motion mechanism, and the plurality of second positions are preset positions corresponding to the first positions on a motion path of the second motion mechanism.
Wherein the first movement mechanism may include a moving pair and a rotating pair, thereby achieving movement and rotation of the receiving lens 3; the second motion mechanism may include a moving pair and a rotating pair, which enable the movement and rotation of the probe 4.
In the measurement process, when the included angle between the laser and the main optical axis of the receiving lens 3 is too small, the measurement accuracy is reduced. According to the technical scheme provided by the embodiment, the number of the first positions and the second positions is not limited by the structure of the laser ranging device, and more first positions and second positions can be provided. Therefore, under the condition that diffuse reflection light is not blocked, the included angle between the laser and the receiving lens 3 is increased, and the measurement precision is improved.
In one embodiment, there is provided a laser distance measuring device, the first moving mechanism includes a first rail, and a first slider disposed on the first rail, and the receiving lens 3 is mounted on the first slider. The second movement mechanism comprises a second track and a second sliding block arranged on the second track, and the detector 4 is arranged on the second sliding block. A plurality of first positions are arranged on the first track, and a plurality of second positions are arranged on the second track.
Wherein, the first position and the second position can be determined by arranging a gear groove, a magnet, a contact and the like on the first track and the second track respectively. And determining the first angle and the second angle according to the shapes of the first track and the second track. The receiving lens 3 and the detector 4 may be driven to move in the first orbit and the second orbit, respectively, by an electric push rod or the like.
The laser ranging device provided by the embodiment can position the first position and the second position according to the track, so that the receiving lens 3 can keep high position accuracy in each first position, and the detector 4 can also keep high position accuracy in each second position. In use, the position accuracy of the receiving lens 3 at the first position and the detector 4 at the second position is high, so that higher measurement accuracy can be obtained.
In one embodiment, a laser distance measuring device is provided, and the detector 4 and the receiving lens 3 can rotate synchronously with the laser as an axis.
In the problem that part of the diffuse reflected light is blocked, only part of the angle of the diffuse reflected light is blocked. Therefore, the problem that diffuse reflection light is blocked can be solved only by synchronously rotating the receiving lens 3 and the detector 4 by a certain angle by taking laser as an axis, an included angle between the laser and a main optical axis of the receiving lens 3 cannot be reduced, and the measurement precision is further improved.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A laser ranging device, comprising:
the laser device (1) is used for emitting laser to irradiate the object to be measured (2);
the receiving lens (3) can adjust the position relative to the laser (1), and is used for focusing the diffuse reflection light reflected by the laser irradiated on the object to be detected (2) and forming a light spot on the detector (4);
the detector (4) is used for detecting the position of the light spot on the detector (4).
2. Laser rangefinder apparatus according to claim 1, characterized in that the receiving lens (3) is movable towards the laser (1) and the detector (4) is movable in synchronism with the receiving lens (3) such that the distance between the spot and the detection edge of the detector (4) is greater than or equal to a preset distance.
3. The laser distance measuring device of claim 1 or 2, wherein at least one of the receiving lens (3) and the detector (4) can rotate, so that the lens plane of the receiving lens (3), the imaging plane of the detector (4) and the shooting plane of the object (2) to be measured intersect on the same straight line.
4. The laser distance measuring device according to claim 1, wherein a plurality of first positions of the receiving lens (3) and a plurality of second positions of the detector (4) are preset on the laser distance measuring device, and the first positions correspond to the second positions one by one; the receiving lens (3) can adjust the position to any one of the first positions, the detector (4) adjusts the position to the corresponding second position along with the receiving lens (3), and the lens plane of the receiving lens (3), the imaging plane of the detector (4) and the shot plane of the object to be measured (2) are intersected on the same straight line.
5. The laser ranging device of claim 4, further comprising a storage medium for storing the position parameters of the plurality of first positions and the plurality of second positions.
6. Laser distance measuring device according to claim 4, characterized in that said receiving lens (3) is an aspherical mirror for focusing said diffusely reflected light at different said first positions, forming said spot on said detector (4).
7. The laser distance measuring device as claimed in any one of claims 4 to 6, wherein a plurality of light inlets corresponding to the plurality of first positions are provided on the laser distance measuring device, and a switch is provided on each of the plurality of light inlets.
8. The laser distance measuring device according to claim 4, characterized in that it is provided with a first movement mechanism on which the receiving lens (3) is mounted and a second movement mechanism on which the detector (4) is mounted; the plurality of first positions are preset positions on the motion path of the first motion mechanism, and the plurality of second positions are preset positions corresponding to the first positions on the motion path of the second motion mechanism.
9. Laser rangefinder apparatus according to claim 8, characterized in that the first movement mechanism comprises a first track, and a first slider arranged on the first track, the receiving lens (3) being mounted on the first slider; the second movement mechanism comprises a second track and a second sliding block arranged on the second track, and the detector (4) is arranged on the second sliding block; the plurality of first positions are arranged on the first track, and the plurality of second positions are arranged on the second track.
10. Laser rangefinder apparatus according to claim 1, characterized in that the detector (4) and the receiving lens (3) are rotatable synchronously about the laser axis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123415230.9U CN216792443U (en) | 2021-12-31 | 2021-12-31 | Laser distance measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123415230.9U CN216792443U (en) | 2021-12-31 | 2021-12-31 | Laser distance measuring device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216792443U true CN216792443U (en) | 2022-06-21 |
Family
ID=82010093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123415230.9U Active CN216792443U (en) | 2021-12-31 | 2021-12-31 | Laser distance measuring device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216792443U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115877391A (en) * | 2023-01-31 | 2023-03-31 | 宜科(天津)电子有限公司 | Data processing system for detecting object distance |
-
2021
- 2021-12-31 CN CN202123415230.9U patent/CN216792443U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115877391A (en) * | 2023-01-31 | 2023-03-31 | 宜科(天津)电子有限公司 | Data processing system for detecting object distance |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4660970A (en) | Method and apparatus for the contact-less measuring of objects | |
| US8670114B2 (en) | Device and method for measuring six degrees of freedom | |
| JP3511450B2 (en) | Position calibration method for optical measuring device | |
| CN110542542B (en) | Device and method for detecting consistency of optical axis of optical simulator under condition of moving platform | |
| JPS63500119A (en) | Instruments for measuring surface morphology | |
| GB2327123A (en) | Angle detection method for bending machine, angle detection apparatus and angle sensor | |
| CN108444410B (en) | Device and method for measuring parallelism of convergent laser emission optical axis and tracking visual axis | |
| CN106425691B (en) | Measuring of Axis Rotating Accuracy detection device and method based on laser interference principle | |
| CN109655235A (en) | A kind of detection method and its device of imaging sensor and camera lens faces parallel | |
| CN106249222B (en) | A kind of femtosecond laser tracker optical axis geometric error caliberating device | |
| CN109655236A (en) | Sensor is as plane and lens interface faces parallel detection method and device | |
| CN216792443U (en) | Laser distance measuring device | |
| CN110132374A (en) | A kind of self-compensation type laser liquid-level measuring system | |
| JP5242940B2 (en) | Non-contact shape measuring device | |
| CN114440800A (en) | Method for accurately measuring effective area of light spot in laser damage threshold test | |
| US4657393A (en) | Pattern optimization when measuring depth to a surface using lens focusing | |
| CN107588929A (en) | Ball-screen projection/tracking system scaling method and calibration device | |
| CN102980534B (en) | The non-contact measurement method of a kind of hidden rotating shaft and end face squareness and system | |
| CN210426956U (en) | Long-focus optical system focus measuring device based on self-aligning plane mirror | |
| CN107085233B (en) | Local radiation flow measurement system based on precise pinhole | |
| CN109990732B (en) | Transverse subtraction differential confocal curvature radius measuring method | |
| CN107168018B (en) | A kind of focusing alignment device and alignment methods | |
| CN111707446B (en) | Method and system for adjusting alignment of light spot center and detector receiving surface center | |
| CN110793468B (en) | Optical element position detection device, control device and detection method | |
| JPH0360260B2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |