KR20200016220A - Beam expander adjustment support method, adjustment support device and beam expander - Google Patents

Abstract

The present invention relates to a method for assisting the adjustment of the beam expander (100), wherein the beam expander comprises a receiving tube (102) having a light entry opening (104) and a light exit opening (108) and a light entry opening (104). At least one optical element 200, 202, 204 arranged in the beam path between the light entry opening 104 and the light exit opening 108 to change the diameter of the beam bundle 106 connected through Have By this method, the beam bundle 106 along the optical axis 110 and the reference plane 114 connected to the receiving tube 102 by detecting the energy distribution of the beam bundle 106 in relation to the cross section of the receiving tube 102. The target position of the beam bundle 106 is determined along the optical axis 110 of the beam expander 100 by detecting the actual position. By comparing the actual position with the target position, the deviation value representing the deviation between the actual position and the target position is confirmed. Finally, support information 124 for supporting the operator in the adjustment using the deviation value is output.

Description

Beam expander adjustment support method, adjustment support device and beam expander

The present invention relates to a support method for the adjustment of the beam expander, the adjustment support device and the beam shock expander.

The beam expander, also called beam expander, enlarges or reduces the laser beam diameter. This allows them to match with other elements of the optical system. Thus, for example, the diameter of the laser beam at the laser exit can be tailored to the required diameter at the entrance of the lens. Such beam expanders are mainly used for laser material processing.

The optimal optical axis of the lens system is the basis of a well-functioning optical system. When installing the beam expander this should be precisely adjusted, ie ideally placed on the optical axis. The user also wants to know if the beam beam quality is normal even after exiting the beam expander.

Under this background, the present invention provides an improved method for supporting the adjustment of a beam expander, a corresponding adjustment support device and an improved beamstrip expander in accordance with the independent claims. Advantageous embodiments will become apparent from the dependent claims and the description below.

The position of the lens system in the beam expander may deviate from the ideal position by, for example, tolerances. Depending on the position of the lens system, different output beam directions and pin positions may result. The approach presented here makes it possible to accurately measure, detect, control and match the position or positioning of the beam expander. For this purpose, a mechanical or optical reference plane is defined, which is monitored by at least one sensor. If you deviate from the target position, you can take appropriate action to correct it. This ensures fast and accurate adjustments. In particular, it can be reliably adjusted even by an inexperienced worker. Similarly, this makes a reliable statement about beam quality. Thus, commissioning of the beam expander can be performed very quickly.

For example, confirmation is made regarding beam position and quality by means of temperature sensors, scattered light sensors or infrared cameras. Depending on the verification results, the user can be given simple but highly helpful feedback, for example, regarding the adjustment of the beam expander in the system.

A method for supporting the adjustment of the beam expander is presented, wherein the beam expander has a light entry opening and a light exit opening and a receiving tube having a light exit opening and a light exit opening to change the diameter of the beam bundle connected through the light entry opening. Having at least one optical element disposed in the beam path between the apertures, wherein the method comprises the following steps:

Determining the target position of the beam bundle along the optical axis of the beam expander by detecting the actual distribution of the beam bundle along the optical axis and the reference plane connected to the receiving tube by detecting the energy distribution of the beam bundle in relation to the cross section of the receiving tube;

Confirming a deviation value representing a deviation between the actual position and the target position by comparing the actual position with the target position; And

Outputting support information to assist the operator in making adjustments using deviation values.

A beam expander can be understood to mean an optical system for increasing or decreasing the beam diameter of a light beam or light beam bundle, in particular a laser beam or a laser beam bundle. An optical element can be understood to mean a lens or a mirror, for example. For example, the optical element may be disposed displaceably in the receiving tube in the longitudinal direction of the receiving tube. Reference planes can be understood to mean, for example, plate or disk shaped elements or mechanically suitable optical elements connected mechanically with the receiving tube. For example, the direction setting of the optical axis may be predetermined by the normal of the reference plane. Energy distribution can be understood to mean, for example, a temperature or luminance distribution. In particular, the energy distribution can be determined in relation to the opening of the beam expander. The assistance information may be understood to mean an operation notification for directing the beam expander. For example, the assistance information may indicate a direction or length indication for position correction of the beam expander or yes / no information or the like.

According to one embodiment, the actual position in the verifying step can be determined by detecting the temperature and / or luminance distribution of the beam bundle with respect to the cross section. This makes it possible to reliably determine the actual position with little effort.

According to an embodiment, the actual position in the confirming step is at least two different positions of the optically active surface of the optical element and / or the receiving tube and / or the place where the light entry opening lies ahead in the radial direction and / or the length of the receiving tube. It can be determined by detecting the energy distribution in places. An optically active surface can be understood as meaning a cross section of an optical element in the region of the opening of the beam expander. Accordingly, the accuracy of determining the actual position can be improved.

According to another embodiment, the actual position in the 'confirmation' step can be determined by detecting the energy distribution in at least two different detection directions along the section. This enables at least two-dimensional detection of the actual position along the cross section.

It is also advantageous that the actual position is determined by detecting the energy distribution in the detection direction orthogonal to each other in the confirmation step. The orthogonal detection direction may be, for example, the vertical axis and the horizontal axis of the two-dimensional coordinate system. This allows the determination of the actual position to be achieved at a relatively low cost.

The approach presented here also provides an adjustment support device for assisting the adjustment of the beam beam expander, wherein the beam expander changes the diameter of the beam bundle connected through the receiving tube and the light entry opening having the light entry opening and the light exit opening. To have at least one optical element disposed in the beam path between the light entry opening and the light exit opening, wherein the adjustment support device has the following features:

A reference surface which can be connected or connectable to the receiving tube;

Sensor means for determining a target position of the beam bundle along the optical axis of the beam expander by detecting the reference plane and determining the actual position of the beam bundle along the optical axis by detecting the energy distribution of the beam bundle in relation to the cross section of the receiving tube; And

Evaluation means for checking the deviation value representing the deviation between the actual position and the target position by comparing the actual position with the target position, and using the deviation value to output support information for assisting the operator in the adjustment.

Sensor means may be understood to mean a single sensor or an arrangement of a plurality of sensors such as temperature, light or scattered light sensors. For example, the sensor may also be distributed around the side of the receiving tube or around the edge of the optical element and arranged in a star or cross shape.

Evaluation means can be understood as meaning an electrical device which processes the sensor signal and thus outputs a control and / or data signal. The evaluation means may have an interface which may be formed on the basis of hardware and / or software. In the case of a hardware-based implementation, the interface may be part of a so-called system ASIC, for example, containing various functions of the device. However, the interface may be its own integrated circuit or may be at least partially composed of discrete components. In the case of software-based implementations, the interface may for example be a software module residing on the microcontroller in addition to other software modules.

According to one embodiment, the sensor means may have at least one temperature sensor and / or at least one light sensor and / or at least one scattered light sensor and / or at least one infrared camera. This makes it possible to accurately and accurately determine the target position and actual position.

Another embodiment may be a special microstructure or nano structuring of the lens surface. For example, it can be a "mesh" of very fine wires in which resistance changes are caused by heating. When these wires are connected to the evaluation means, since the thermal inertia of the fine wires is low, the position is confirmed accurately and quickly.

For example, the sensor means for determining the actual and / or target position is a sensor diaphragm positioned upstream of the light entry opening in the radial direction to detect the reflection of the beam bundle upon entering the receiving tube and having at least two sensors. Can have As such, the actual position and / or the target position can be determined by an evaluation regarding the reflection patterns, in particular an evaluation of the symmetry of the reflection patterns, and the like.

The approach presented here also provides a beam expander with the following features:

A receiving tube having a light entry opening and a light exit opening;

At least one optical element arranged in a beam path between the light entry opening and the light exit opening to change the diameter of the beam bundle connected through the light entry opening; And

An apparatus for assisting coordination according to one of the embodiments.

It may also be stored on a machine readable carrier or storage medium such as a semiconductor memory, a hard disk memory or an optical memory and used for performing, implementing and / or controlling the steps of the method according to one of the embodiments described above. A computer program product or computer program having a program code is advantageous, especially when the program product or program is executed on a computer or device.

The invention is explained in more detail by way of example with reference to the accompanying drawings.
1 is a schematic diagram of a beam expander according to an embodiment of the present invention in an initial state.
2 is a schematic diagram of a beam expander according to an embodiment of the present invention.
3 is a schematic view of the sensor means of FIG. 2.
4 is a schematic view of a sensor means according to an alternative embodiment of the invention.
5 is a diagram showing a temperature distribution detected by the sensor means according to an embodiment of the present invention.
6 is a diagram showing a temperature distribution detected by the sensor means according to an embodiment of the present invention.
7 is a schematic diagram of a beam expander according to an embodiment of the present invention.
8 is a schematic view of the sensor means of FIG. 7.
9 is a schematic view of a sensor means according to an alternative embodiment of the invention.
10 is a diagram showing the luminance distribution detected by the sensor means according to the embodiment of the present invention.
11 is a schematic diagram of a beam expander according to an embodiment of the present invention.
12 is a schematic diagram of a portion of a beam expander according to an embodiment of the present invention.
13 is a schematic view of the sensor image of the sensor means according to an exemplary embodiment of the present invention in the correct connection.
14 is a schematic view of the sensor image of the sensor means according to an embodiment of the present invention in the inclined connection.
15 is a schematic diagram of evaluation means according to an embodiment of the present invention.
16 is a flowchart of a method according to an embodiment of the present invention.

In the following description of the preferred embodiment of the present invention, the same or similar reference numerals are used for similarly acting elements shown in different drawings, and the repeated description for these elements is omitted.

1 shows a schematic diagram of a beam expander 100 in an initial state in accordance with an exemplary embodiment of the invention in an initial state. Beam expander 100 includes a receiving tube 102 for receiving a lens system, such as an optical zoom or a focusing system with a narrow field of view. The receiving tube 102 has a light entry opening 104 for connecting to the beam bundle 106 and a light exit opening 108 for connecting to the beam bundle 106. For clarity, beam bundle 106 is shown as a single beam. In practice, however, the beam bundle 106 may comprise a plurality of (in the same direction) single rays. In particular, the beam bundle 106 is laser light. The lens system is arranged and configured in the beam path between the light entry opening 104 and the light exit opening 108 to change the diameter of the beam bundle 106. The dotted line represents the optimal optical axis 110 of the lens system. Tolerances can cause the direction and position of the output beam to vary. In FIG. 1, three different output beam directions of the beam bundle 106 are shown in the light exit opening 108 as an example.

The beam expander 100 includes an adjustment support device 112 for assisting the operator when the operator adjusts the beam expander 100. The adjustment support device 112 has a reference plane 114 representing the orientation of the optical axis 110 and is fixedly connected to the receiving tube 102. The reference plane 114 is realized as a mechanical reference defined by the optical axis 110, for example. According to FIG. 1, the optical axis 110 extends perpendicularly to the reference plane 114. As an example, the reference plane 114 is arranged here on the light entry surface 104 of the receiving tube 102.

The adjustment support device 112 further comprises sensor means 116 designed to determine a target position of the beam bundle 106 along the optical axis 110 by detecting the reference plane 114 and output a target value representing the target position 118. Further, the sensor means 116 is configured to determine the actual position of the beam bundle 106 along the optical axis 110 by detecting the energy distribution of the beam bundle 106 in the cross section of the receiving tube 102 and output an actual value 120 representing the actual position.

For example, the adjustment support device 112 is implemented as an internal temperature sensor or a scattering light sensor as the sensor means 116.

The evaluation means 122 of the adjustment support device 112 is configured to receive the two values 118 and 120 from the sensor means 116 and to output the support information 124 for assisting the operator in the adjustment by comparing the two values 118 and 120.

According to an alternative embodiment, the determination of the target position or the actual position is made by corresponding further processing of the sensor signal of the sensor means 116 by the evaluation means 122.

2 shows a schematic diagram of a beam expander 100 for use with an embodiment of the invention. The beam expander 100 essentially corresponds to the beam expander described above with reference to FIG. 1. The first optical element 200, the second optical element 202 and the third optical element 204 are shown by way of example in the form of individual lenses of the lens system. For example, optical elements 200, 202, and 204 are slidably disposed within receiving tube 102 to change the diameter of beam bundle 106. Similar to FIG. 1, the beam bundle 106 is tilted into the receiving tube 102 with respect to the optical axis 110.

According to this embodiment, the sensor means 116 is adapted to detect the energy distribution of at least one first sensor 206, the beam bundle 106 on the second optical element 202, for detecting the energy distribution of the beam bundle 106 on the first optical element 200. And at least one third sensor 210 for detecting energy distribution of the beam bundle 106 on the at least one second sensor 208 and the third optical element 204. According to FIG. 2, the sensors 206, 208, 210 are each configured as a temperature sensor for detecting a temperature distribution along the cross section of the receiving tube 102.

The further sensor 212 of the sensor means 116 is configured to detect the temperature of the receiving tube 102, for example on the side of the receiving tube 102. The temperature of the receiving tube 102 functions as a reference temperature, for example when detecting a temperature distribution.

An optional cover glass 214 covering the light exit opening 108 is also shown.

3 schematically shows the sensor means 116 of FIG. 2. A front view of the first optical element 200 is shown. However, the following description of the sensor means 116 may similarly apply to the second or third optical element of the beam expander.

In order to detect the four temperature values T1, T2, T3 and T4 for determining the temperature distribution and thereby to locate the actual position of the beam bundle 106, four first sensors 206 are arranged at even intervals around the edge of the optical element 200. It is distributed. A beam bundle 106, such as a 1 / e2-laser beam, is within the effective opening 300 of the beam expander.

The first sensor 206 is arranged crosswise, and the two sensors 206 are paired with each other to face each other. This makes it possible to detect the actual position of the beam bundle 106 in two different, orthogonal detection directions along the cross section of the receiving tube.

According to this exemplary embodiment, the sensor 206 is distributed around the lens edge 302 of the optical element 200.

4 shows a schematic view of the sensor means 116 according to an alternative exemplary embodiment of the invention. Unlike FIG. 3, the sensor means 116 has eight first sensors 206 instead of four. In this case, the sensors 206 are distributed in, for example, ring-shaped around the optical element 200 and arranged in pairs opposite to each other so that the temperature distribution can be detected in four different detection directions. For example, the four detection directions are transposed by an angle of 45 degrees each.

FIG. 5 shows a diagram illustrating the temperature distribution detected by the sensor means according to the invention, for example the sensor means described above with reference to FIG. 3. A two-dimensional coordinate system is shown for measuring or calculating the center of the beam expander. Here, the vertical axis 500 corresponds to the first detection direction of the sensor means, and the horizontal axis 502 corresponds to the second detection direction. Point 504 represents the actual position of the beam bundle in the cross section of the receiving tube, more specifically in the optically active side of the optical element of FIG. 3. As an example, the point 504 is in the fourth quadrant of the coordinate system corresponding to the actual position of the beam bundle.

6 is a view showing a temperature distribution detected by the sensor means according to an embodiment of the present invention. A coordinate system is shown for a more complex computational model for calculating the center of the beam expander, in particular with the aid of sensors distributed in the longitudinal direction of the receiving tube and each position moved in millimeters on the horizontal axis 502. In addition to point 504, two further points 600, 602 are shown, each representing the actual position of the beam bundle at different measuring points in the longitudinal direction of the receiving tube, for example in the second and third optical elements. .

5 and 6 illustrate a computational model that can be used to determine sensor position. The beam position identified therefrom generates information for correction via, for example, an LED or a display.

7 shows a schematic diagram of a beam expander 100 according to an embodiment of the invention. The beam expander 100 substantially corresponds to the beam expander described above with reference to FIG. 2, but in order to determine the actual position of the beam bundle 106 with reference to the luminance distribution along the cross section of the receiving tube 102, the sensors 206, 208, 210, There is a difference that 212 is not configured as a temperature sensor but is configured as an optical sensor or a scattered light sensor.

The optical sensor or the scattered light sensor is arranged in a ring or cross shape around the outer edges of the optical elements 200, 202, 204, respectively, for example as shown in FIGS. 8 and 9.

8 schematically shows the sensor means 116 of FIG. 7. A front view of a first optical element 200 having four first sensors 206 in the form of an optical sensor or a scattered light sensor is shown, which are described with reference to FIG. 3 to detect the four luminance values P1, P2, P3, P4. Similar to the exemplary embodiment described above, they are arranged in a cross shape around the edge of the optical element 200.

9 shows a schematic view of the sensor means 116 according to an alternative exemplary embodiment of the invention. In contrast to FIG. 8, similar to the exemplary embodiment described above with reference to FIG. 4, the sensor means 116 uses eight sensors 206 in the form of a photodiode or scattered light sensor for each optical element to detect scattered light or back reflection. Have The sensor 206 is arranged in a ring shape around the optical element as shown in FIG. 9 as an example of the first optical element 200.

The temperature profiles shown in FIGS. 3, 4, 8 and 9 may be constructed using, for example, special microstructures or nanostructures of the lens surface. Here, for example, a "mesh" of very fine wires extending horizontally and vertically to the lens surface and configured to cause a change in resistance when heated can be used. When these wires are connected to the evaluation unit, the low thermal inertia of the (micro) wires allows accurate and rapid identification of the location of the heated spot by evaluating the resistance of the individual wires. Therefore, checking the center of gravity of the heated spot in the horizontal and vertical directions can be performed very easily. In this way, the confirmation of the heated position can be performed very quickly and accurately, so that the adjustment is made very quickly and accurately based on this known position. The settling time of the adjustment support device based on this approach is also very short.

10 is a diagram showing the luminance distribution detected by the sensor means according to the present invention, for example, the sensor means described above with reference to FIG. 8. The luminance distribution is shown similarly to the temperature distribution described above with reference to FIG. 5 in a two-dimensional coordinate system with axes 500 and 502. Here, nonlinear scaling is needed to calculate the center of the beam expander.

11 shows a schematic diagram of a beam expander 100 according to an embodiment of the invention. According to this embodiment, the sensor means 116 comprises an additional sensor ring 1100 of at least four optical sensors 1101. In order to detect the actual position or the target position, in order to detect the reflection of the beam bundle 106 upon entering the receiving tube 102, the sensor ring 1100 is a light entry opening 104 in the reflection direction, more precisely the light entry of the first optical element 200. Located upstream of the surface. The optical sensor 1101 is for example adapted to the wavelength of application of the beam expander 100.

12 shows a schematic diagram of a cross section of a beam expander 100 according to an embodiment of the invention. The sensor ring 1100 of FIG. 11 is shown and is implemented here as a sensor diaphragm for passing the beam bundle 106 within an angular range determined by a suitable geometric diaphragm structure.

The arrangement shown here is based on the fact that in the central state also the residual reflection must provide a symmetrical pattern. For this purpose, a ring of suitable light sensor is arranged at a position where such residual reflection can be detected. Optionally, using a filter ensures that all other wavelengths are not detected and no interference signal is generated.

13 shows a schematic sensor image 1300 of a sensor means according to an exemplary embodiment of the present invention when the beam bundle is correctly connected into the beam expander. The sensor image 1300 shows the distribution of illuminance intensities detected by the sensor means along the optical axis of the beam expander.

FIG. 14, unlike FIG. 13, shows a schematic sensor image 1400 of the sensor means in the case of a tilted connection.

15 shows a schematic diagram of the evaluation means 122 according to an embodiment of the present invention. The evaluation means 122 includes a confirming unit 1500 for confirming the deviation value 1502 by comparing the target position with the actual position using the target value 118 and the actual value 120. Thus, the deviation value 1502 represents the deviation between the target position and the actual position. The output unit 1504 is configured to output the assistance information 124 using the deviation value 1502. Assistance information 124 indicates, for example, an indication that can be displayed via an LED or a display. For example, the LED lights green if the temperature or luminance profile detected by the sensor means indicates the correct alignment of the beam expander and red if the temperature or luminance profile does not indicate the correct alignment of the beam expander. It is also possible to display a medium level LED indication or a direction recommendation that references a reference on the display.

16 shows a flowchart of a method 1600 according to an embodiment of the present invention. For example, the method 1600 for supporting beam expander coordination may be performed using the coordination assistance device described above. In this case, in step 1610, the target position of the beam bundle is determined by detecting the reference plane. Likewise, the actual position of the beam bundle is determined at step 1610 by detecting the energy distribution of the beam bundle in the receiving tube. In a further step 1620, the deviation value between the actual position and the target position is determined by comparing the actual position with the target position. Finally, in step 1630, the assistance information is output using the deviation value to assist the operator in the adjustment of the beam expander.

Next, various embodiments of the approach presented herein are summarized again in another word. Adjustment of the optical system by the beam expander 100 is accomplished by determining a target position with reference to the reference plane 114 along the optical axis 110 and measuring and adjusting by at least one sensor.

According to one exemplary embodiment, a sensor system having at least one temperature sensor and / or light sensor and / or scattered light sensor is used for this purpose. In this case, the sensors are in particular connected to one another and networked to respond to very small deviations and to make corrections and adjustments. Data detection for correction is made with reference to the reference plane 114.

According to another embodiment, the beam expander 100 has at least one adjusting diaphragm with a sensor, also referred to as sensor ring 1100 above. Optionally, detection is achieved via an IR-camera image using an IR-camera, IR / VIS-camera or scattered light sensor.

For example, to determine the sensor position, a computational model is used, which generates the beam position identified therefrom and finally provides information for correction.

The optical elements and sensors of the optical system are in particular located in accordance with the reference plane 114. Reference plane 114 is, for example, a mechanical or optical reference, through which very precise adjustments are possible.

The light sensor is arranged for example on or above the optically active surface, for example on an individual optical element, lens or diaphragm. Combinations of temperature and light sensors are also possible.

The embodiments described and shown in the figures are selected by way of example only. Different embodiments may be combined with one another completely or with respect to individual features. In addition, one embodiment may be complemented by features of another embodiment.

Furthermore, the steps of the method according to the invention may be repeated or executed in a different order than the described order.

If an example embodiment includes a “and / or” link between a first feature and a second feature, an example embodiment according to one embodiment has both a first feature and a second feature, and in yet another embodiment It is to be understood that the exemplary embodiment accordingly has only the first feature or only the second feature.

Claims (11)

A method 1000 for assisting the adjustment of the beam expander 100, the beam expander 100 comprising a receiving tube 102 having a light entry opening 104 and a light exit opening 108, and the light entry At least one optical element 200, 202 arranged in a beam path between the light entry opening 104 and the light exit opening 108 to change the diameter of the beam bundle 106 connected through the opening 104. 204, and the method 1600 includes the following steps:
The beam bundle 106 along the optical axis 110 and the reference plane 114 connected to the receiving tube 102 by detecting the energy distribution of the beam bundle 106 in relation to the cross sections 300, 302 of the receiving tube 102. Detecting the actual position and determining 1610 a target position of the beam bundle 106 along the optical axis 110 of the beam expander 100;
Identifying 1620 a deviation value 1502 representing a deviation between the actual position and the target position by comparing the actual position with the target position; And
Outputting 1630 support information 124 to assist the operator in making adjustments using the deviation value 1502. As a method 1600 according to claim 1, the actual position in the step of decision 1610 is determined by detecting the temperature and / or luminance distribution of the beam bundle 106 in relation to the cross sections 300, 302. As a method 1600 according to one of the preceding clauses, the actual position in the step of crystal 1610 is determined by the optically active surface of the optical element 200, 202, 204 and / or the receiving tube 102 and / or in the radial direction. It is determined by detecting the energy distribution at a location located upstream of the entry opening 104 and / or at least two different locations in the longitudinal direction of the receiving tube 102. As a method 1600 according to one of the above clauses, the actual position in the step of decision 1610 is determined by detecting the energy distribution in at least two different detection directions along the cross-sections 300, 302. As a method 1600 according to claim 4, in the step of decision 1610, the actual position is determined by detecting the energy distribution in a detection direction orthogonal to each other. An adjustment support device 112 for assisting in the adjustment of the beam expander 100, the beam expander 100 comprising a receiving tube 102 having a light entry opening 104 and a light exit opening 108; At least one optical element 200 arranged in a beam path between the light entry opening 104 and the light exit opening 108 to change the diameter of the beam bundle 106 connected through the light entry opening 104; 200, 204, the adjustment support device 112 has the following features:
A reference plane 114 connected or connectable with the receiving tube 102;
By detecting the reference plane 114, the target position of the beam bundle 106 along the optical axis 110 of the beam expander 100 is determined and the beam bundle (in relation to the cross sections 300, 302 of the receiving tube 102) Sensor means 116 for determining the actual position of the beam bundle 106 along the optical axis 110 by detecting the energy distribution of 106; And
Checking the deviation value 1502 representing the deviation between the actual position and the target position by comparing the actual position with the target position, and using the deviation value 1502 to output support information 124 for assisting the operator in the adjustment. Evaluation means 122. The adjustment support device 112 according to claim 6, wherein the sensor means 116 comprises at least one temperature sensor and / or at least one light sensor and / or at least one scattered light sensor and / or at least one infrared camera. Have 8. The adjustment support device 112 according to claim 6, wherein the sensor means 116 for determining the actual position and / or the target position, enters the beam bundle 106 when entering the receiving tube 102. It has a diaphragm 1100 located upstream of the light entry opening 104 in the radial direction to detect reflection of the light source and having at least two sensors 1101. Beam expander 100 having the following features:
A receiving tube 102 having a light entry opening 104 and a light exit opening 108;
At least one optical element 200 arranged in a beam path between the light entry opening 104 and the light exit opening 108 to change the diameter of the beam bundle 106 connected through the light entry opening 104. , 202, 204; And
An apparatus for assisting coordination (112) according to claims 6-8. A computer program configured to execute and / or control the steps of the method 1600 according to claim 1. A machine-readable storage medium having a computer program according to claim 10 stored therein.

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