CN113466888A - Laser ranging method and laser range finder for equipment room - Google Patents
Laser ranging method and laser range finder for equipment room Download PDFInfo
- Publication number
- CN113466888A CN113466888A CN202110660872.0A CN202110660872A CN113466888A CN 113466888 A CN113466888 A CN 113466888A CN 202110660872 A CN202110660872 A CN 202110660872A CN 113466888 A CN113466888 A CN 113466888A
- Authority
- CN
- China
- Prior art keywords
- laser
- laser beam
- measured
- reference line
- equipment room
- 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.)
- Pending
Links
Images
Classifications
-
- 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
- G01S17/46—Indirect determination of position data
- G01S17/48—Active triangulation systems, i.e. using the transmission and reflection of electromagnetic waves other than radio waves
Abstract
The invention provides a laser ranging method and a laser range finder for an equipment room, wherein the plane where a first laser beam and a second laser beam are located is vertical to the plane where the second laser beam and a third laser beam are located; irradiating the first laser beam to any point on a reference line of a plane where a first measured object is located, irradiating the second laser beam to the first measured object, and irradiating the third laser beam to the reference line; keeping the position of the first laser beam still, respectively adjusting the second laser beam to irradiate on a second measured object, and the third laser beam to irradiate on a reference line; and calculating the vertical distance and the horizontal distance between the two measured objects and the reference line by using the cosine law, so as to obtain the horizontal distance and the vertical distance between the two measured objects. The invention can measure the distance between two objects to be measured in the space in the horizontal direction and the distance between the two objects to be measured in the vertical direction, has clear principle and simple structure, and opens a new idea for measuring the distance between the two objects in the space.
Description
Technical Field
The invention relates to the technical field of laser ranging, in particular to a laser ranging method and a laser range finder for an equipment room.
Background
A laser rangefinder is an instrument that uses laser to accurately measure a target object. The phase method laser range finder uses a laser transmitter to transmit a beam of fine laser to a target object, receives the reflected laser beam through a laser phase detection original piece, and calculates the distance according to the phase delay of the received laser.
Although the conventional laser range finder can accurately measure the distance between two points in a plane through one laser transmitter and one phase detection device, the conventional laser range finder cannot accurately measure the horizontal distance and the vertical distance of a measured object, and further cannot measure the distance between the two measured objects in the horizontal direction and the distance between the two measured objects in the vertical direction.
Disclosure of Invention
The invention provides a laser ranging method and a laser range finder for an equipment room, which are used for solving the problem that the distance measurement between any two spatial measured objects in the horizontal direction and the distance measurement between any two spatial measured objects in the vertical direction cannot be carried out in the prior art.
In order to achieve the above object, a first aspect of the present invention provides a laser ranging method for an equipment room, including:
the laser emitting device irradiates the measured object and the plane where the measured object is located at different angles;
the plane where the first laser beam and the second laser beam are located is perpendicular to the plane where the second laser beam and the third laser beam are located; irradiating the first laser beam to any point on a reference line of a plane where a first measured object is located, irradiating the second laser beam to the first measured object, and irradiating the third laser beam to the reference line;
keeping the position of the first laser beam still, respectively adjusting the second laser beam to irradiate on a second measured object, and the third laser beam to irradiate on a reference line;
and respectively calculating the horizontal distance between the two measured objects and any point on the reference line and the vertical distance between the two measured objects and the reference line by using the cosine law, thereby obtaining the horizontal distance and the vertical distance between the two measured objects.
According to the laser ranging method for the equipment room provided by the invention, the positions of the third laser beam irradiated on the reference line are the projection positions of the two measured objects on the reference line respectively.
According to the laser ranging method for the equipment room, the first measured object and the second measured object are located on the same plane.
According to the laser ranging method for the equipment room, provided by the invention, the laser emitting device comprises three laser range finders which are respectively a first laser range finder, a second laser range finder and a third laser range finder;
wherein the first laser range finder emits the first laser beam, the second laser range finder emits the second laser beam, and the third laser range finder emits the third laser beam.
According to the laser distance measuring method for the equipment room, the three laser distance measuring instruments form included angles with each other.
According to the laser ranging method for the equipment room, provided by the invention, the included angle is measured by the angle measuring instrument.
According to the laser ranging method for the equipment room, provided by the invention, the first measured object and the second measured object are both prefabricated embedded parts of the wall of the equipment room.
In order to achieve the above object, a second aspect of the present invention provides a laser range finder for an equipment room, which includes a laser emitting device, an angle measuring instrument, a data processing module and a display module, wherein the laser emitting device is electrically connected to the angle measuring instrument, the data processing module and the display module, respectively.
According to the laser distance measuring instrument for the equipment room provided by the invention, the laser emitting device is used for emitting the first laser beam, the second laser beam and the third laser beam to the reference line of the plane of the object to be measured and the object to be measured respectively.
According to the laser range finder for the equipment room provided by the invention, the data processing module is a central controller, and the display module is a touch screen.
The laser ranging method for the equipment room provided by the invention has the advantages that three different laser beams are emitted to different positions through the laser emitting device, the included angles among the three different laser beams and the distances measured by the three different laser range finders are measured, so that a triangle is formed between two adjacent laser range finders, the horizontal distance and the vertical distance of a measured object, the distance between the two measured objects in the horizontal direction and the distance between the two measured objects in the vertical direction are calculated by utilizing the cosine theorem, the principle is clear, the structure is simple, and a new thought is opened for measuring the distance between the two objects in space.
The laser range finder for the equipment room provided by the invention can accurately measure the horizontal distance and the vertical distance between two objects in the space and the horizontal distance and the vertical distance between the two objects.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a laser ranging method for an equipment room provided by the invention;
FIG. 2 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the present invention;
reference numerals:
1: a first laser range finder; 2: a second laser rangefinder; 3: a third laser range finder;
4: an angle measuring instrument; 5: a data processing module; 6: a display module;
7: a first prefabricated embedded part; 8: a second prefabricated embedded part; 9: a first laser beam;
10: a second laser beam; 11: a third laser beam; 12: a reference line.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Embodiments of the present invention will be described below with reference to fig. 1 to 3. It should be understood that the following description is only exemplary embodiments of the present invention and is not intended to limit the present invention in any way.
Referring to fig. 1 and 2, as an embodiment of the present invention, a method for measuring a distance by using a laser in an equipment room includes:
the laser emitting device irradiates the measured object and the plane where the measured object is located at different angles; it can be understood that the laser beam emitted by the laser emitting device can be irradiated to the object to be measured, and can also be irradiated to any point of the plane where the object to be measured is located.
Wherein the planes of the first laser beam 9 and the second laser beam 10 are perpendicular to the planes of the second laser beam 10 and the third laser beam 11; irradiating a first laser beam 9 to any point on a plane elevation line where a measured object is located, irradiating a second laser beam 10 to the measured object, and irradiating a third laser beam 11 to a reference line 12;
keeping the position of the first laser beam 9 still, respectively adjusting a second laser beam 10 to irradiate on a second measured object, and a third laser beam 11 to irradiate on a reference line; so that the two adjacent laser distance measuring instruments form a triangle with the measuring distance, and the included angle between the two adjacent laser distance measuring instruments and the distance between the two adjacent laser distance measuring instruments and the target point are known; namely, the length and the included angle of two adjacent sides of the known triangle are equivalent to the length of the third side.
And respectively calculating the horizontal distance between the two measured objects and any point on the reference line and the vertical distance between the two measured objects and the reference line by using the cosine law, thereby obtaining the horizontal distance and the vertical distance between the two measured objects.
The laser distance measuring device has the advantages that the laser emitting device emits three different laser beams to different positions, the included angles among the three different laser beams and the distances measured by the three different laser distance measuring instruments are measured, so that a triangle is formed between every two adjacent laser distance measuring instruments, the horizontal distance and the vertical distance of a measured object, the distance between the two measured objects in the horizontal direction and the distance between the two measured objects in the vertical direction are calculated by utilizing the cosine theorem, the principle is clear, the structure is simple, and a new thought is opened for measuring the distance between the two objects in space.
In one embodiment, the positions of the third laser beam irradiated on the reference line are the projection positions of the two measured objects on the reference line, respectively, so as to install the laser emitting device and the over-angle measuring instrument 4, and simultaneously ensure that the measured distance is the distance in the vertical direction of the measured object, namely the height of the measured object to the reference line in the plane.
In one embodiment, the first measured object and the second measured object are located on the same plane, so that measurement and calculation are convenient, and in general, the equipment is installed in the same plane, so that the equipment is more practical.
In one embodiment, the laser emitting device comprises three laser rangefinders, respectively a first laser rangefinder 1, a second laser rangefinder 2 and a third laser rangefinder 3;
wherein the first laser range finder 1 emits a first laser beam 9, the second laser range finder 2 emits a second laser beam 10, and the third laser range finder 3 emits a third laser beam 11.
In one embodiment, included angles exist among the three laser range finders, that is, the three laser range finders are not collinear with each other, so that planes where laser beams emitted by two adjacent laser range finders are located form a triangle, and the distance between measured objects to be measured can be calculated conveniently through the cosine theorem of the triangle.
In one embodiment, the included angle is measured by the angle measuring instrument 4. Here, a resistance angle measuring instrument may be used, and the angle measuring instrument 4 may be arranged along a plane where the first laser range finder 1 and the second laser range finder 2 are located, that is, the first laser range finder 1 and the second laser range finder 2 are connected through a rotating shaft, and the angle measuring instrument 4 is also installed on the rotating shaft; the angle measuring instrument 4 can also be arranged along the plane where the second laser distance measuring instrument 2 and the third laser distance measuring instrument 3 are located, i.e. the first laser distance measuring instrument 1 and the second laser distance measuring instrument 2 are connected by a rotating shaft, and the angle measuring instrument 4 is also installed on the rotating shaft.
In one embodiment, the first object to be measured and the second object to be measured are both prefabricated embedded parts of the wall of the equipment room. Specifically, the prefabricated embedded part can be a steel plate preset before concrete pouring so as to facilitate subsequent fixing equipment.
Referring to fig. 2 and 3, as another embodiment of the present invention, the present invention provides a laser range finder for an equipment room, including a laser emitting device, an angle measuring apparatus 4, a data processing module 5 and a display module 6, wherein the laser emitting device is electrically connected to the angle measuring apparatus 4, the data processing module 5 and the display module 6, respectively.
In one embodiment, the laser emitting device is used for emitting the first laser beam 9, the second laser beam 10 and the third laser beam 11 to a plane reference line 12 (a mark height line) of a measured object and the measured object respectively.
Specifically, the data processing module is a central controller, performs information processing and reflects the processed information on the display module, and the display module is a touch screen, so that the information can be displayed and can be used as input equipment to realize man-machine interaction.
In the distance measuring process, a first laser beam 9 irradiates to any point on an elevation line of a plane where a first measured object is located, and the distance between the first laser distance meter 1 and any point on the elevation line of the plane where the first measured object is located can be measured through wall reflection; irradiating a second laser beam 10 to the first measured object, and measuring the distance between the second laser range finder 2 and the first measured object in the same way; the third laser beam 11 irradiates to a reference line (a height line), and the position of the third laser beam 11 irradiating to the reference line (the height line) is the projection of the first measured object on the reference line; the distances measured by the three laser range finders respectively form two triangles, the distance between the first measured object and the reference line in the vertical direction is calculated by using the cosine law and is recorded as D1, and the horizontal distance between the first measured object and the point of the first laser beam irradiated on the reference line is recorded as L1.
Keeping the position of the first laser beam 9 on the reference line still, adjusting the irradiation of the second laser beam 10 to the second measured object, the irradiation of the third laser beam 11 on the reference line, that is, the point of the second measured object projected on the reference line, and the same can obtain the distance D2 between the second measured object in the vertical direction and the reference line, and the horizontal distance L2 between the projection of the second measured object on the reference line and the point of the first laser beam 9 on the reference line. The difference between the distances of the two measured objects in the horizontal direction (D2-D1) is the horizontal distance between the two measured objects, and the difference between the distances of the two measured objects in the vertical direction (L2-L1) is the vertical distance between the two measured objects.
In order to more clearly and completely describe the technical scheme of the present invention so that the technical scheme of the present invention can be clearly realized, the following examples are given:
the first embodiment is as follows:
the laser emitting device adopted by the invention comprises three laser range finders, namely a first laser range finder 1, a second laser range finder 2 and a third laser range finder 3.
The plane formed by the first laser beam 9 and the third laser beam 11 emitted by the first laser range finder 1 and the third laser range finder 3 respectively is recorded as a plane a.
The plane formed by the second laser beam 10 and the third laser beam 11 respectively emitted by the second laser range finder 2 and the third laser range finder 3 is recorded as a plane b. The plane a and the plane b are arranged perpendicular to each other.
When in use, the first laser beam 9 emitted by the first laser range finder 1 is aligned to any point O on a horizontal reference line (elevation line) 12 of the side wall where the prefabricated embedded part to be measured is located. The second laser beam 10 emitted by the second laser range finder 2 is directed at one of the objects to be measured, and the third laser beam 11 emitted by the third laser range finder 3 is irradiated on a horizontal reference line (height line) 12, which is the projection of the object to be measured on the reference line.
Assuming that a point on a horizontal reference line (a height line) 12 irradiated by the third laser beam 11 emitted by the third laser range finder 3 is a point P, a distance from the point P to the point O is a horizontal distance between a projection of the first pre-buried part 7 on the reference line and the point O. The distance between the first buried preform 7 and the point P is the distance between the first buried preform 7 and the horizontal reference line 12 in the vertical direction.
At the moment, the included angle between the laser beams is measured by the angle measuring instrument 4, the distances measured by the laser distance measuring instruments form a triangle, the included angle between two adjacent laser distance measuring instruments is known, and two adjacent laser distance measuring instruments can measure two adjacent distances, so that the distance L1 in the horizontal direction and the distance D1 in the vertical direction of the first prefabricated embedded part 7 are calculated according to the cosine law.
Example two:
on the basis of the first embodiment, the first laser beam 9 emitted by the first laser range finder 1 is kept to be on the point O, the second laser range finder 2 is adjusted to emit the second laser beam 10 to be on the second pre-buried part 8, and the third laser range finder 3 is adjusted to emit the third laser beam 11 to be on the horizontal reference line 12.
Let the intersection of the third laser beam 11 emitted by the third laser rangefinder 3 and the horizontal reference line 12 be Q. The distance from the point Q to the point O is the horizontal distance between the projection of the second pre-buried part 8 on the reference line and the point O. The distance between the second buried preform 8 and the point Q is the vertical distance between the second buried preform 8 and the horizontal reference line 12.
At this time, the included angle between the laser beams is measured by the angle measuring instrument 4, and the laser distance measuring instruments can measure the distance from the reference point to the embedded part and the reference line 12, and according to the cosine law, the horizontal distance L2 and the vertical distance D2 of the second prefabricated embedded part 8 are calculated.
And finally, calculating the difference (D2-D1) between the distances of the two prefabricated embedded parts in the horizontal direction, namely the horizontal distance between the two prefabricated embedded parts, and calculating the difference (L2-L1) between the distances of the two prefabricated embedded parts in the vertical direction, namely the vertical distance between the two prefabricated embedded parts.
And the prefabricated embedded parts are steel plates which are preset in advance when a concrete wall is poured at the position where the equipment is installed in the equipment room, and the installation position of the equipment can be designed more accurately by measuring the horizontal distance and the vertical distance between every two adjacent prefabricated embedded parts so as to improve the installation efficiency of the equipment.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A laser ranging method for an equipment room is characterized by comprising the following steps:
the laser emitting device irradiates the measured object and the plane where the measured object is located at different angles;
the plane where the first laser beam and the second laser beam are located is perpendicular to the plane where the second laser beam and the third laser beam are located; irradiating the first laser beam to any point on a reference line of a plane where a first measured object is located, irradiating the second laser beam to the first measured object, and irradiating the third laser beam to the reference line;
keeping the position of the first laser beam still, respectively adjusting the second laser beam to irradiate on a second measured object, and the third laser beam to irradiate on a reference line;
and respectively calculating the horizontal distance between the two measured objects and any point on the reference line and the vertical distance between the two measured objects and the reference line by using the cosine law, thereby obtaining the horizontal distance and the vertical distance between the two measured objects.
2. The laser ranging method for the equipment room of claim 1, wherein the positions where the third laser beam is irradiated onto the reference line are projected positions of the two measured objects on the reference line, respectively.
3. The laser ranging method for equipment room of claim 2, wherein the first measured object and the second measured object are located on the same plane.
4. The laser ranging method for the equipment room as claimed in claim 2, wherein the laser emitting device comprises three laser rangefinders, a first laser rangefinder, a second laser rangefinder and a third laser rangefinder, respectively;
wherein the first laser range finder emits the first laser beam, the second laser range finder emits the second laser beam, and the third laser range finder emits the third laser beam.
5. The laser ranging method for the equipment room of claim 4, wherein the three laser ranging devices are mutually inclined.
6. The laser ranging method for equipment room of claim 5, wherein the included angle is measured by an angle measuring instrument.
7. The laser ranging method for the equipment room of any one of claims 1 to 6, wherein the first measured object and the second measured object are both prefabricated embedded parts of the wall of the equipment room.
8. The utility model provides a laser range finder for equipment room, includes laser emitter, angle measuring apparatu, data processing module and display module, laser emitter respectively with angle measuring apparatu, data processing module and display module electric connection.
9. The laser range finder for equipment room of claim 8, wherein the laser emitting device is configured to emit the first laser beam, the second laser beam and the third laser beam onto a reference line of a plane where the object to be measured is located and the object to be measured, respectively.
10. The laser range finder for equipment room of claim 8, wherein the data processing module is a central controller and the display module is a touch screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110660872.0A CN113466888A (en) | 2021-06-15 | 2021-06-15 | Laser ranging method and laser range finder for equipment room |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110660872.0A CN113466888A (en) | 2021-06-15 | 2021-06-15 | Laser ranging method and laser range finder for equipment room |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113466888A true CN113466888A (en) | 2021-10-01 |
Family
ID=77869924
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110660872.0A Pending CN113466888A (en) | 2021-06-15 | 2021-06-15 | Laser ranging method and laser range finder for equipment room |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113466888A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088039A (en) * | 2021-11-23 | 2022-02-25 | 贵州电网有限责任公司 | Distance measuring device for charged equipment and using method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000018508A (en) * | 1998-09-02 | 2000-04-06 | 박정근 | Laser distance measuring device |
| CN107462883A (en) * | 2017-08-04 | 2017-12-12 | 中车青岛四方机车车辆股份有限公司 | Method and laser range finder of the measurement point to any dimension plan range in space |
| CN110849273A (en) * | 2019-11-20 | 2020-02-28 | 上海电力大学 | Non-contact space point location measuring method and device |
| CN110988895A (en) * | 2019-11-11 | 2020-04-10 | 深圳市度彼电子有限公司 | Measuring device, system and method |
| CN211528691U (en) * | 2019-12-10 | 2020-09-18 | 云南交通运输职业学院 | Laser ranging device for two-point distance ranging |
-
2021
- 2021-06-15 CN CN202110660872.0A patent/CN113466888A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20000018508A (en) * | 1998-09-02 | 2000-04-06 | 박정근 | Laser distance measuring device |
| CN107462883A (en) * | 2017-08-04 | 2017-12-12 | 中车青岛四方机车车辆股份有限公司 | Method and laser range finder of the measurement point to any dimension plan range in space |
| CN110988895A (en) * | 2019-11-11 | 2020-04-10 | 深圳市度彼电子有限公司 | Measuring device, system and method |
| CN110849273A (en) * | 2019-11-20 | 2020-02-28 | 上海电力大学 | Non-contact space point location measuring method and device |
| CN211528691U (en) * | 2019-12-10 | 2020-09-18 | 云南交通运输职业学院 | Laser ranging device for two-point distance ranging |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088039A (en) * | 2021-11-23 | 2022-02-25 | 贵州电网有限责任公司 | Distance measuring device for charged equipment and using method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7110092B2 (en) | Measuring device and measuring method for determining distance and/or position | |
| JP7257326B2 (en) | Surveying instrument, surveying system, surveying method and surveying program | |
| US8269984B2 (en) | Distance-measuring method for a device projecting a reference line, and such a device | |
| CN109031253A (en) | Laser radar calibration system and scaling method | |
| US20150042645A1 (en) | Processing apparatus for three-dimensional data, processing method therefor, and processing program therefor | |
| JP2016505838A (en) | Method and apparatus for determining position coordinates of a target | |
| JP2013190272A (en) | Three-dimensional laser measuring apparatus and three-dimensional laser measuring method | |
| JP6545862B1 (en) | Method for setting reference position of elevator equipment, method for installing elevator equipment, reference position setting device for elevator equipment, and reference position setting system | |
| CN103673999B (en) | A kind of laser measurement best measurement position positioning system | |
| Wang et al. | Modeling of binocular stereo vision for remote coordinate measurement and fast calibration | |
| CN105423999A (en) | Measurement device with adjustable light source distance and measurement method | |
| CN113466888A (en) | Laser ranging method and laser range finder for equipment room | |
| JP6252722B2 (en) | Laser distance measuring method and laser distance measuring apparatus | |
| CN106323170B (en) | The method of real-time of concrete vibrating quality based on laser three-D positioning | |
| CN202102110U (en) | Phased array radar apparatus for measuring stacked diffuse solid material | |
| Mohammed | Important methods measurements to exam the accuracy and reliability of reflector-less total station measurements | |
| US11874369B2 (en) | Location detection method, apparatus, device and readable storage medium | |
| CN110910633A (en) | Road condition information processing method, device and system | |
| US20130021618A1 (en) | Apparatus and method to indicate a specified position using two or more intersecting lasers lines | |
| JP2002257545A (en) | Simplified measuring method and measuring device of vertical displacement or the like | |
| CN110127521B (en) | Steel coil center coordinate detection device and method | |
| CN108072326B (en) | Method and device for observing light beam irradiation | |
| JP2009300365A (en) | Profilometer | |
| CN205228386U (en) | Pointolite size measurement device | |
| CN110244312B (en) | Distributed multi-source information cooperative positioning system and method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |