CN110207587B - Method for measuring optical vertex of pyramid prism - Google Patents
Method for measuring optical vertex of pyramid prism Download PDFInfo
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- CN110207587B CN110207587B CN201910495513.7A CN201910495513A CN110207587B CN 110207587 B CN110207587 B CN 110207587B CN 201910495513 A CN201910495513 A CN 201910495513A CN 110207587 B CN110207587 B CN 110207587B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/02—Testing optical properties
- G01M11/0242—Testing optical properties by measuring geometrical properties or aberrations
Abstract
The invention relates to the technical field of precision engineering measurement and discloses a pyramid prism optical vertex measuring device and a measuring method, wherein the pyramid prism optical vertex measuring device comprises a laser ranging module, a spectroscope and a pyramid prism which are sequentially arranged along the same light path; the laser ranging module is used for emitting measuring light and measuring the distance between the measuring light and the optical vertex of the pyramid prism; a second reflecting mirror is arranged on a reflection light path of a first light splitting surface of the spectroscope, and a pyramid prism is arranged on the first light splitting surface of the spectroscope relative to a transmission light path of the laser ranging module; the first light splitting surface of the light splitter is provided with a position sensitive device on a transmission light path opposite to the second reflecting mirror, and the position sensitive device is also positioned on a reflection light path of the second light splitting surface of the light splitter. The invention utilizes the pyramid prism optical vertex measuring device to ensure that the pyramid prism optical vertex measuring device can be applied to the calibration process of the pyramid prism reference ruler in the laser tracker measuring system to realize the accurate positioning and measurement of the pyramid prism optical vertex space position.
Description
Technical Field
The invention relates to the technical field of precision engineering measurement, in particular to a device and a method for measuring the optical vertex of a pyramid prism.
Background
Currently, the calibration of laser trackers is usually done using a cube-corner prism reference scale. The laser tracker measures spatial coordinates of optical vertexes of the two pyramid prisms through the pyramid prisms respectively aiming at the two ends of the reference ruler, further obtains a linear distance value between the two optical vertexes, and calibrates the laser tracker by comparing the linear distance value with a nominal value.
Some researches are carried out on the acquisition method of the nominal distance value between the optical vertexes of the pyramid prism reference ruler by a few domestic metering technical mechanisms, usually, a coordinate measuring machine probe is used for carrying out multi-point detection on the outer spherical surface of the pyramid prism, the detection points are fitted into a sphere, and the length value of a standard ball rod is determined by evaluating the distance between two sphere centers. The calibration process assumes that the center of the outer spherical surface of the pyramid prism coincides with the optical center of the prism, but actually, because the processing of the pyramid prism has deviation, the two centers are not coincident necessarily, and the accuracy of the reference ruler of the pyramid prism is reduced. Therefore, the optical vertex of the pyramid prism needs to be directly aimed at in the process of calibrating the pyramid prism reference ruler, the spatial position of the optical vertex needs to be determined, and the accuracy of the pyramid prism reference ruler needs to be improved.
Disclosure of Invention
Technical problem to be solved
In view of the technical defects and application requirements, the application provides a device and a method for measuring the optical vertex of the corner cube prism, so as to solve the problem that the optical vertex of the corner cube prism is accurately positioned in the calibration process of the reference ruler of the corner cube prism.
(II) technical scheme
To solve the above problems, the present invention provides an optical vertex measuring device for a corner cube prism, comprising: the laser ranging module, the spectroscope and the pyramid prism are sequentially arranged along the same optical path; the laser ranging module is used for emitting measuring light and measuring the distance between the measuring light and the optical vertex of the pyramid prism;
a second reflecting mirror is arranged on a reflection light path of a first light splitting surface of the spectroscope, and the pyramid prism is arranged on a transmission light path of the first light splitting surface of the spectroscope, which is opposite to the laser ranging module; and a position sensing device is arranged on the first light splitting surface of the spectroscope relative to a transmission light path of the second reflecting mirror, and the position sensing device is also positioned on the second light splitting surface of the spectroscope relative to a reflection light path of the pyramid prism.
Further, still include: and the position adjusting platform is used for fixing the pyramid prism and controlling the pyramid prism to move in a three-dimensional space.
Further, still include: a first laser absorption sheet; the first laser absorption sheet is arranged on a transmission light path of the first light splitting surface of the light splitter relative to the laser ranging module, and the first laser absorption sheet is detachably fixed between the light splitter and the pyramid prism.
Further, still include: a second laser absorption sheet; the second laser absorption sheet is arranged on a reflection light path of the first light splitting surface of the light splitting mirror, and the second laser absorption sheet is detachably fixed between the light splitting mirror and the second reflecting mirror.
Further, still include: a first reflector; the first reflector is arranged on a light path between the laser ranging module and the spectroscope and used for controlling the propagation direction of the measuring light.
Furthermore, the spectroscope is a cube type beam splitter formed by splicing two 45-degree right-angle triangular prisms, and the measuring light is split on the inclined surfaces of the triangular prisms.
Furthermore, the included angle between the spectroscope and the measuring light emitted by the laser ranging module is 45 degrees, and the measuring light emitted by the laser ranging module passes through the center of the first light splitting surface of the spectroscope.
In order to solve the above problems, the present invention further provides a method for measuring an optical vertex of a corner cube prism, the method comprising the steps of:
step S1: starting the laser ranging module to enable measuring light emitted by the laser ranging module to be divided into two parts after passing through a first light splitting surface of a spectroscope;
step S2: the first part of measuring light reaches the second reflecting mirror from the first light splitting surface of the spectroscope along a reflection light path, the measuring light reflected by the second reflecting mirror passes through the first light splitting surface of the spectroscope and reaches the position sensing device along a transmission light path, and the position coordinate of the center of the light spot on the position sensing device at the moment is recorded and used as a reference coordinate;
step S3: the second part of measuring light reaches the pyramid prism from the first light splitting surface of the light splitter along the transmission light path, the position of the pyramid prism is adjusted, the measuring light reflected by the pyramid prism reaches the position sensitive device through the second light splitting surface of the light splitter along the reflection light path until the position coordinate of the light spot center on the position sensitive device is consistent with the reference coordinate, and the space coordinate of the pyramid prism at the moment is recorded;
step S4: keeping the position of the pyramid prism unchanged, measuring the distance between the vertex of the pyramid prism and the laser ranging module by utilizing the laser ranging function of the laser ranging module, acquiring the height coordinate of the pyramid prism, and determining the space coordinate of the optical vertex of the pyramid prism.
Further, if the cube-corner prism optical vertex measuring apparatus is provided with a first laser absorption sheet and a second laser absorption sheet, the step S2 specifically includes the following steps:
and placing the first laser absorption sheet, removing the second laser absorption sheet, enabling a first part of the measuring light to reach the second reflecting mirror from the first light splitting surface of the spectroscope along a reflection light path, enabling the measuring light reflected by the second reflecting mirror to pass through the first light splitting surface of the spectroscope and reach the position sensitive device along a transmission light path, and recording the position coordinate of the center of the light spot on the position sensitive device at the moment and taking the position coordinate as a reference coordinate.
Further, if the cube-corner prism optical vertex measuring apparatus is provided with a first laser absorption sheet and a second laser absorption sheet, the step S3 specifically includes the following steps:
and placing a second laser absorption sheet, removing the first laser absorption sheet, enabling a second part of measuring light to reach the pyramid prism from the first light splitting surface of the light splitter along the transmission light path, adjusting the position of the pyramid prism, enabling the measuring light reflected by the pyramid prism to reach the position sensitive device through the second light splitting surface of the light splitter along the reflection light path until the position coordinate of the light spot center on the position sensitive device is consistent with the reference coordinate, and recording the space coordinate of the pyramid prism at the moment.
(III) advantageous effects
The invention provides a pyramid prism optical vertex measuring device and a measuring method. A second reflecting mirror is arranged on a reflection light path of the first light splitting surface of the spectroscope, and a pyramid prism is arranged on the first light splitting surface of the spectroscope relative to a transmission light path of the laser ranging module. The first light splitting surface of the spectroscope is provided with a position sensing device on a transmission light path relative to the second reflecting mirror, and the position sensing device is also positioned on a reflection light path of the second light splitting surface of the spectroscope, so that the pyramid prism optical vertex measuring device can realize accurate positioning and measurement of the pyramid prism optical vertex space position after straight calibration.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in 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 structural diagram of an optical vertex measuring apparatus of a corner cube prism according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method for measuring an optical vertex of a corner cube according to an embodiment of the present invention;
wherein, 1: a laser ranging module; 2: a first reflector; 3: a second laser absorption sheet; 4: a second reflector; 5: a first laser absorption sheet; 6: a pyramid prism; 7: a position adjustment platform; 8: a beam splitter; 9: a position sensitive device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 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.
The embodiment of the invention provides a pyramid prism optical vertex measuring device, as shown in fig. 1, the pyramid prism optical vertex measuring device comprises a laser ranging module 1, a spectroscope 8 and a pyramid prism 6 which are sequentially arranged along the same optical path. The laser ranging module 1 is used for emitting measuring light and measuring the distance between the measuring light and the optical vertex of the pyramid prism 6, namely the laser ranging module 1 has two functions, on one hand, continuous collimation laser can be emitted and used for measuring the optical vertex position of the pyramid prism 6, and the wavelength of the laser depends on the response wavelength of the position sensitive device 9. On the other hand, the distance between the laser ranging module 1 and the optical vertex of the corner cube 6 can be measured in a laser ranging manner. A second reflecting mirror 4 is arranged on a reflection light path of the first light splitting surface of the spectroscope 8, and a pyramid prism 6 is arranged on a transmission light path of the first light splitting surface of the spectroscope 8 relative to the laser ranging module 1. The first light splitting surface of the beam splitter 8 is provided with a position sensing device 9 on a transmission light path opposite to the second reflecting mirror 4, and the position sensing device 9 is also positioned on a reflection light path of the second light splitting surface of the beam splitter 8 opposite to the pyramid prism 6. The optical characteristic of the corner cube 6 is that it can shift the light incident on the corner cube 6 by a certain distance and then reflect the light in the original direction. Specifically, when light is incident on the optical vertex of the corner cube 6, the reflected light is returned directly in the original direction without being shifted.
In this embodiment, the collimated laser emitted by the laser ranging module 1 is transmitted to the splitting surface of the beam splitter 8 and then divided into two parts, and one part is used as the collimated laser, transmitted along the positive direction of the X axis, and reflected after reaching the second reflecting mirror 4. The normal of the surface of the second reflecting mirror 4 is parallel to the incident light, so that the light reflected by the second reflecting mirror 4 propagates along the negative direction of the X-axis, passes through the beam splitter 8 and reaches the position sensor 9. The other part is used as measuring laser and is transmitted along the Z-axis negative direction, reaches the pyramid prism 6 after passing through the spectroscope 8, is transmitted along the Z-axis positive direction after being reflected by the pyramid prism 6, and is reflected to the position sensitive device 9 by the beam splitting surface after reaching the spectroscope 8.
In the process of measuring the optical vertex by using the pyramid prism optical vertex measuring device, the laser ranging module 1 is started firstly, so that the measuring light emitted by the laser ranging module 1 is divided into two parts after passing through the first light splitting surface of the beam splitter 8. The first part of the measuring light reaches the second reflecting mirror 4 from the first light splitting surface of the beam splitter 8 along the reflection light path, the measuring light reflected by the second reflecting mirror 4 passes through the first light splitting surface of the beam splitter 8 and reaches the position sensor 9 along the transmission light path, and the position coordinate of the center of the light spot on the position sensor 9 at the moment is recorded and used as the reference coordinate. The second part of the measuring light reaches the corner cube prism 6 from the first beam splitter surface of the beam splitter 8 along the transmission light path. Adjusting the position of the pyramid prism 6, in this embodiment, only the position of the pyramid prism 6 needs to be adjusted along the direction X, Y, so that the measurement light reflected by the pyramid prism 6 reaches the position sensitive device 9 along the reflection light path through the second light splitting surface of the beam splitter 8 until the position coordinate of the light spot center on the position sensitive device 9 is consistent with the reference coordinate, the spatial coordinate of the pyramid prism 6 at this time is recorded, and at this time, the aiming measurement of the optical vertex of the pyramid prism 6 in the XY plane is completed. Keeping the position of the pyramid prism 6 unchanged, measuring the distance between the vertex of the pyramid prism and the laser ranging module 1 by utilizing the laser ranging function of the laser ranging module 1, acquiring the height coordinate of the pyramid prism 6, and determining the space coordinate of the optical vertex of the pyramid prism 6.
In order to adjust and record the position of the corner cube 6, as shown in fig. 1, a position adjusting platform 7 may be provided, the corner cube 6 is fixed by the position adjusting platform 7, the corner cube 6 is controlled to move in a three-dimensional space, and the aimed corner cube 6 is placed on the position adjusting platform 7. The position adjustment platform 7 can move the aimed pyramid prism 6 along X, Y, Z three directions.
The invention provides a pyramid prism optical vertex measuring device which is characterized in that a laser ranging module, a spectroscope and a pyramid prism are sequentially arranged along the same light path. A second reflecting mirror is arranged on a reflection light path of a first light splitting surface of the spectroscope, and a pyramid prism is arranged on a transmission light path of the first light splitting surface of the spectroscope relative to the laser ranging module; the first light splitting surface of the spectroscope is provided with a position sensing device on a transmission light path relative to the second reflecting mirror, and the position sensing device is also positioned on a reflection light path of the second light splitting surface of the spectroscope, so that the pyramid prism optical vertex measuring device can realize accurate positioning and measurement of the pyramid prism optical vertex space position after straight calibration.
In an embodiment according to the present invention, as shown in fig. 1, if there is not enough space and the collimated laser beam emitted from the laser ranging module 1 propagates in the positive direction of the X-axis, a first reflecting mirror 2 may be disposed between the laser ranging module 1 and the beam splitter 8 to change the propagation direction of the measuring light.
In one embodiment according to the present invention, as shown in fig. 1, in order to avoid interference between various measurement lights during measurement, which may cause experimental error, a first laser absorption sheet 5 may be further provided. The first laser absorption sheet 5 is arranged on a transmission light path of the first light splitting surface of the light splitter 8 relative to the laser ranging module 1, and the first laser absorption sheet 5 is detachably fixed between the light splitter 8 and the pyramid prism 6. Similarly, a second laser absorption sheet 3 may be further disposed, the second laser absorption sheet 3 is disposed on the reflected light path of the first light splitting surface of the beam splitter 8, and the second laser absorption sheet 3 is detachably fixed between the beam splitter 8 and the second reflecting mirror 4. The first laser absorption sheet 5 and the second laser absorption sheet 3 are used for shielding the light paths where the first laser absorption sheet and the second laser absorption sheet are respectively located and absorbing laser.
When the reference coordinate is measured, the first laser absorption sheet 5 is placed, the second laser absorption sheet 3 is removed, a first part of measuring light reaches the second reflecting mirror 4 from the first light splitting surface of the beam splitter 8 along a reflection light path, the measuring light reflected by the second reflecting mirror 4 passes through the first light splitting surface of the beam splitter 8 and reaches the position sensitive device 9 along a transmission light path, and the position coordinate of the center of the light spot on the position sensitive device 9 at the moment is recorded and used as the reference coordinate.
When the spatial coordinate of the pyramid prism needs to be measured, the second laser absorption sheet 3 is placed firstly, the first laser absorption sheet 5 is removed, the second part of the measuring light reaches the pyramid prism 6 from the first light splitting surface of the spectroscope 8 along the transmission light path, the position of the pyramid prism 6 is adjusted, the measuring light reflected by the pyramid prism 6 reaches the position sensitive device 9 through the second light splitting surface of the spectroscope 8 along the reflection light path until the position coordinate of the light spot center on the position sensitive device 9 is consistent with the reference coordinate, and the spatial coordinate of the pyramid prism 6 at the moment is recorded.
In one embodiment according to the invention, as shown in fig. 1, the beam splitter 8 is a cube-type beam splitter, which is formed by two 45 ° right-angled triangular prisms on which the measuring light is split. The included angle between the spectroscope 8 and the measuring light emitted by the laser ranging module 1 is 45 degrees, that is, the spectroscope 8 is positioned on the measuring light beam transmitted along the Z axis, the included angle between the spectroscopic surface and the YZ plane is 45 degrees, and the measuring light emitted by the laser ranging module 1 passes through the center of the first spectroscopic surface of the spectroscope 8.
The invention also provides a method for measuring the optical vertex of the corner cube prism. As shown in fig. 1, the measurement method utilizes a pyramid prism optical vertex measurement device, which includes a laser ranging module 1, a spectroscope 8 and a pyramid prism 6 sequentially arranged along the same optical path. The laser ranging module 1 is used for emitting measuring light and measuring the distance between the measuring light and the optical vertex of the pyramid prism 6, a second reflecting mirror 4 is arranged on the reflection light path of the first light splitting surface of the spectroscope 8, and the pyramid prism 6 is arranged on the transmission light path of the first light splitting surface of the spectroscope 8 relative to the laser ranging module 1. The first light splitting surface of the beam splitter 8 is provided with a position sensing device 9 on a transmission light path opposite to the second reflecting mirror 4, and the position sensing device 9 is also positioned on a reflection light path of the second light splitting surface of the beam splitter 8 opposite to the pyramid prism 6. For a more detailed structure, please refer to the text description related to fig. 1, which is not described herein again.
As shown in fig. 2, the method comprises the steps of:
step S1: starting the laser ranging module to enable measuring light emitted by the laser ranging module to be divided into two parts after passing through a first light splitting surface of a spectroscope;
step S2: the first part of measuring light reaches the second reflecting mirror from the first light splitting surface of the spectroscope along a reflection light path, the measuring light reflected by the second reflecting mirror passes through the first light splitting surface of the spectroscope and reaches the position sensing device along a transmission light path, and the position coordinate of the center of the light spot on the position sensing device at the moment is recorded and used as a reference coordinate;
step S3: the second part of measuring light reaches the pyramid prism from the first light splitting surface of the light splitter along the transmission light path, the position of the pyramid prism is adjusted, the measuring light reflected by the pyramid prism reaches the position sensitive device through the second light splitting surface of the light splitter along the reflection light path until the position coordinate of the light spot center on the position sensitive device is consistent with the reference coordinate, and the space coordinate of the pyramid prism at the moment is recorded;
step S4: keeping the position of the pyramid prism unchanged, measuring the distance between the vertex of the pyramid prism and the laser ranging module by utilizing the laser ranging function of the laser ranging module, acquiring the height coordinate of the pyramid prism, and determining the space coordinate of the optical vertex of the pyramid prism.
As shown in fig. 1, step S2 includes the following steps after the first laser absorption sheet 5 and the second laser absorption sheet 3 are disposed in the corner cube optical vertex measuring apparatus: the first laser absorption sheet 5 is placed, the second laser absorption sheet 3 is removed, a first part of measuring light reaches the second reflecting mirror 4 from the first light splitting surface of the beam splitter 8 along a reflection light path, the measuring light reflected by the second reflecting mirror 4 passes through the first light splitting surface of the beam splitter 8 and reaches the position sensitive device 9 along a transmission light path, and the position coordinate of the light spot center on the position sensitive device 9 at the moment is recorded and used as a reference coordinate.
As shown in fig. 1, step S3 includes the following steps after the first laser absorption sheet 5 and the second laser absorption sheet 3 are disposed in the corner cube optical vertex measuring apparatus: the second laser absorption sheet 3 is placed firstly, the first laser absorption sheet 5 is removed, the second part of measuring light reaches the pyramid prism 6 from the first light splitting surface of the spectroscope 8 along the transmission light path, the position of the pyramid prism 6 is adjusted, the measuring light reflected by the pyramid prism 6 reaches the position sensitive device 9 through the second light splitting surface of the spectroscope 8 along the reflection light path until the position coordinate of the light spot center on the position sensitive device 9 is consistent with the reference coordinate, and the space coordinate of the pyramid prism 6 at the moment is recorded.
Specifically, as shown in fig. 1, the specific process of measuring the optical vertex of the corner cube prism is as follows: first, self-calibration of the device is performed. And starting the laser ranging module 1, placing the first laser absorption sheet 5, and removing the second laser absorption sheet 3. The continuous collimation laser emitted by the laser ranging module 1 reaches the second reflecting mirror 4 after passing through the first reflecting mirror 2 and the spectroscope 8, and passes through the spectroscope 8 to reach the position sensitive device 9 after being reflected by the second reflecting mirror 4. And recording the position coordinates of the center of the light spot on the position sensitive device 9 as reference coordinates at the moment, and finishing the self-calibration of the device. After the self-calibration of the device is completed, the aiming measurement is carried out on the optical vertex of the pyramid prism. The first laser absorbing sheet 5 is removed and a second laser absorbing sheet is placed. The aimed pyramid prism 6 is placed on the position adjustment stage 7. The position adjustment platform 7 can move the aimed pyramid prism 6 along X, Y, Z three directions. The optical characteristic of the corner cube 6 is that it can reflect light incident on the corner cube in the original direction after shifting a distance. Specifically, when light is incident on the optical vertex of the corner cube, the reflected light will return directly in the original direction without being shifted. Therefore, when the measurement light does not enter the optical center of the corner cube 6 and the reflected light thereof propagates to the position sensor 9, the center coordinates of the reflected light spot do not coincide with the reference coordinates. And (3) adjusting the position of the pyramid prism 6 along the direction X, Y until the central coordinate of the reflected light spot is consistent with the reference coordinate, recording the space coordinate of the pyramid prism 6 at the moment, and finishing the aiming measurement of the optical vertex of the pyramid prism 6 in the XY plane at the moment. Keeping the position of the pyramid prism 6 unchanged, and measuring the distance between the vertex of the pyramid prism and the laser ranging module 1 by using the laser ranging function of the laser ranging module 1. In this way, the spatial position of the optical apex of the corner cube 6 can be completely determined.
The measurement of the optical vertex of the pyramid prism is repeatedly tested for many times by the technical scheme, the displacement of the three-dimensional position adjusting platform along the X, Y direction is measured by the laser interferometer, and the repeated positioning precision is inspected. After the optical vertex of the corner cube is first aimed, the displacement measurement system indication in the direction of X, Y, Z is set to 0, and this position is used as a reference. And repeatedly aiming and measuring the optical vertex of the pyramid prism for multiple times, respectively recording the readings of the X, Y, Z direction position measuring system, and calculating the repeated positioning precision and the space coordinate repeated positioning precision of each direction according to a Bessel formula. The results of the measurements are shown in Table 1 below.
The standard uncertainty introduced by the positioning repeatability in each direction is as follows:
the spatial coordinate measurement standard uncertainty is as follows:
according to the calculation, repeated positioning tests are carried out on the vertex of the pyramid prism for many times, the measurement uncertainty in each direction and the measurement uncertainty of the space coordinate are small, and the measurement method is proved to have good measurement accuracy.
TABLE 1 measurement of repeatability of optical vertex of cube-corner prism
In summary, the method for measuring the optical vertex of the corner cube provided by the invention comprises the step of sequentially arranging the laser ranging module, the spectroscope and the corner cube along the same optical path. A second reflecting mirror is arranged on a reflection light path of the first light splitting surface of the spectroscope, and a pyramid prism is arranged on the first light splitting surface of the spectroscope relative to a transmission light path of the laser ranging module. The first light splitting surface of the spectroscope is provided with a position sensing device on a transmission light path relative to the second reflecting mirror, and the position sensing device is also positioned on a reflection light path of the second light splitting surface of the spectroscope, so that the pyramid prism optical vertex measuring device can realize accurate positioning and measurement of the pyramid prism optical vertex space position after straight calibration.
The above-described embodiments of the apparatus are merely illustrative, and the units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. One of ordinary skill in the art can understand and implement it without inventive effort.
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 (7)
1. A method for measuring an optical vertex of a corner cube, the method comprising measuring the optical vertex of the corner cube using a corner cube optical vertex measuring apparatus, the corner cube optical vertex measuring apparatus comprising:
the laser ranging module, the spectroscope and the pyramid prism are sequentially arranged along the same optical path; the laser ranging module is used for emitting measuring light and measuring the distance between the measuring light and the optical vertex of the pyramid prism;
a second reflecting mirror is arranged on a reflection light path of a first light splitting surface of the spectroscope, and the pyramid prism is arranged on a transmission light path of the first light splitting surface of the spectroscope, which is opposite to the laser ranging module; a position sensing device is arranged on the first light splitting surface of the light splitter mirror relative to the transmission light path of the second reflecting mirror, and the position sensing device is positioned on the second light splitting surface of the light splitter mirror relative to the reflection light path of the pyramid prism;
the method for measuring the optical vertex of the corner cube prism comprises the following steps:
step S1: starting the laser ranging module to enable the measuring light emitted by the laser ranging module to pass through the first light splitting surface of the light splitter and then be divided into two parts;
step S2: a first part of the measuring light reaches the second reflecting mirror from the first light splitting surface of the light splitter along a reflection light path, the measuring light reflected by the second reflecting mirror passes through the first light splitting surface of the light splitter and reaches the position sensitive device along a transmission light path, and the position coordinate of the center of the light spot on the position sensitive device at the moment is recorded and used as a reference coordinate;
step S3: the second part of measuring light reaches the pyramid prism from the first light splitting surface of the light splitter along a transmission light path, the position of the pyramid prism is adjusted, the measuring light reflected by the pyramid prism passes through the second light splitting surface of the light splitter and reaches the position sensitive device along a reflection light path until the position coordinate of the light spot center on the position sensitive device is consistent with the reference coordinate, and the space coordinate of the pyramid prism at the moment is recorded;
step S4: keeping the position of the pyramid prism unchanged, measuring the distance between the vertex of the pyramid prism and the laser ranging module by utilizing the laser ranging function of the laser ranging module, acquiring the height coordinate of the pyramid prism, and determining the space coordinate of the optical vertex of the pyramid prism.
2. The method of claim 1, wherein the apparatus further comprises:
and the position adjusting platform is used for fixing the pyramid prism and controlling the pyramid prism to move in a three-dimensional space.
3. The method of claim 1, wherein the apparatus further comprises:
a first laser absorption sheet; the first laser absorption sheet is arranged on a transmission light path of the first light splitting surface of the light splitter relative to the laser ranging module, and the first laser absorption sheet is detachably fixed between the light splitter and the pyramid prism;
a second laser absorption sheet; the second laser absorption sheet is arranged on a reflected light path of the first light splitting surface of the light splitter, and the second laser absorption sheet is detachably fixed between the light splitter and the second reflecting mirror;
the step S2 specifically includes the following steps:
and placing the first laser absorption sheet, removing the second laser absorption sheet, enabling a first part of the measuring light to reach the second reflecting mirror from the first light splitting surface of the spectroscope along a reflection light path, enabling the measuring light reflected by the second reflecting mirror to pass through the first light splitting surface of the spectroscope and reach the position sensitive device along a transmission light path, and recording the position coordinate of the center of the light spot on the position sensitive device at the moment and taking the position coordinate as a reference coordinate.
4. The method of claim 1, wherein the apparatus further comprises:
a first laser absorption sheet; the first laser absorption sheet is arranged on a transmission light path of the first light splitting surface of the light splitter relative to the laser ranging module, and the first laser absorption sheet is detachably fixed between the light splitter and the pyramid prism;
a second laser absorption sheet; the second laser absorption sheet is arranged on a reflected light path of the first light splitting surface of the light splitter, and the second laser absorption sheet is detachably fixed between the light splitter and the second reflecting mirror;
the step S3 specifically includes the following steps:
and placing a second laser absorption sheet, removing the first laser absorption sheet, enabling a second part of measuring light to reach the pyramid prism from the first light splitting surface of the light splitter along the transmission light path, adjusting the position of the pyramid prism, enabling the measuring light reflected by the pyramid prism to reach the position sensitive device through the second light splitting surface of the light splitter along the reflection light path until the position coordinate of the light spot center on the position sensitive device is consistent with the reference coordinate, and recording the space coordinate of the pyramid prism at the moment.
5. The method for measuring the optical vertex of the corner cube according to claim 1, further comprising:
a first reflector; the first reflector is arranged on a light path between the laser ranging module and the spectroscope and used for controlling the propagation direction of the measuring light.
6. The method as claimed in claim 1, wherein the beam splitter is a cube type beam splitter formed by combining two 45 ° right-angled triangular prisms, and the measuring light is split at the inclined surfaces of the triangular prisms.
7. The method as claimed in claim 6, wherein the angle between the beam splitter and the measuring light from the laser ranging module is 45 degrees, and the measuring light from the laser ranging module passes through the center of the first beam splitting surface of the beam splitter.
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