EP2721372A1

EP2721372A1 - Device and method for calibrating the direction of a polar measurement device

Info

Publication number: EP2721372A1
Application number: EP12733413.4A
Authority: EP
Inventors: Rudolf Staiger
Original assignee: Zoller and Froehlich GmbH
Current assignee: Zoller and Froehlich GmbH
Priority date: 2011-06-20
Filing date: 2012-06-14
Publication date: 2014-04-23
Also published as: WO2012175185A1; US20140125997A1; DE102011105376A1

Abstract

The invention relates to a method and to a device for calibrating the direction of a polar measurement device, in particular of a laser scanner, which comprises a reference element (1) which can be or is rotationally fixed to a holding device of a polar measurement device, in particular to a stand, by means of which element a reference direction (4) is defined in a horizontal plane, and which comprises a rotating element (5) which is rotationally fixed to the polar measurement device and which can rotate together with the polar measurement device relative to the reference element (1) about a vertical axle (2), and at least one optical measurement device (3, 6, 3', 6') is provided, by means of which the agreement between an orientation of the rotating element (5) and the reference direction (4) of the reference element (1) can be measured, and in particular signaled.

Description

Device and method for directional calibration of a

Polar meter

The invention relates to a device for directional calibration of a

Polar meter. In the context of the invention, a polar measuring device is understood to mean such a measuring device which detects measured values as a function of polar coordinates, i. preferably in dependence of an angular orientation in a horizontal plane and an angular orientation in a vertical plane

Plane which is rotated around a vertical axis of rotation during the measurement.

An example of such a polar gauge is a laser scanner which has a fixed piece of equipment which is immovable in a measurement acquisition and is e.g. is connected to a holding device, in particular a tripod and has a rotating device part, which rotates at a measured value recording about a vertical axis relative to the fixed housing part.

By this rotation, the measuring direction can be specified in a horizontal plane, wherein in the rotated device part further comprises a transmitting and receiving device is provided with which at a predetermined angle in the horizontal direction in several vertical angular orientations a laser beam emitted and its reflection signal is detected. In this case, at least the duration of the reflection signal is detected, optionally depending on the laser scanner and the intensity of the reflected signal, so that there is the possibility in polar coordinates, i. the two angle coordinates in the horizontal and in the vertical plane to realize a three-dimensional visual capture of the environment.

CONFIRMATION COPY It is known to operate such polar measuring devices, in particular those laser scanners, with a holding device, by means of which the

Polarmessgerät, in particular a laser scanner, is held such that its axis of rotation about which the moving part of the laser scanner device is rotated relative to the stationary, is aligned exactly vertically. For this purpose, for example, a tripod can be used, the stand rod is kept oscillating, so that this rod automatically following gravity vertically and thus aligns vertically and thus there is a corresponding vertical alignment of the axis of rotation of the rotated laser scanner device part.

In particular, with laser scanners of this type, an application has been developed in which underground channels and their course can be detected. For this purpose, it is provided, for example, a laser scanner of the type described above, e.g. standing upside down, i. in particular with the rotating device part of the laser scanner hanging down and connected to the fixed device part with the holding device perform three-dimensional environmental recordings, such a laser scanner can be lowered through vertical manholes in depth, for which a tripod column with the hanging laser scanner by a e.g. ground-level channel opening is lowered into the channel, so as to perform laser scanning in one or more depths and thus to create all-around images of the channel environment.

It is thus possible to create images of the underground channel management without going through the channels by persons.

It has proved to be problematic that, although with such

Arrangement illustrations of the underground channel guide can be created, but it is not apparent from such a recording itself, in which orientation the channels are relative to a reference on the earth's surface. It is therefore the object of the invention to provide a device and a method for directional calibration of a polar gauge, such as a

To provide a laser scanner, which is given the opportunity to calibrate a measured value series recorded with a polar gauge, in particular a pixel scanner recorded with a laser scanner or their three-dimensional representation, with a reference, in particular an aboveground reference to the measured values or in a pictorial presentation

information presented in a given measuring level of the

Polarmessgerätes were put into relation with

Comparison data, in particular another pixel cloud or a three-dimensional reproduction formed therefrom, which comes from another, especially above-ground measurement level.

In particular with respect to this channel application, which, however, does not limit the invention, although it represents a preferred application, the orientation of underground channels represented in a pictorial representation can thus be related to an aerial one

Reference picture, for example, which shows the building surrounding the manhole.

The object is achieved by a device that a

Includes reference element, the rotationally fixed to a holding device of the

Polarmessgerätes, for example, on a tripod, is fastened or is attached to a performed assembly and by which a reference direction is defined in a horizontal plane and further comprising a rotary member which is non-rotatable with the Polarmessgerät and that together with the

Polar measuring device is rotatable relative to the reference element about a vertical axis and further comprises at least one optical measuring device, in particular electro-optical measuring device, by means of which the coincidence of alignment of the rotary member with the reference direction of the reference element is measurable, in particular can be signaled. The rotary element can be attached to the polar gauge, for example, such that it can be fastened in a rotationally fixed manner or fastened after assembly or be at least coupled to the polar meter rotatably when it is not directly or indirectly attached to this.

According to the method, therefore, the object is achieved in that a

Reference element rotatably on / in a holding device of the Polarmessgerätes, such as is arranged on / in a tripod is or is, in particular attached or is, being defined by the reference element, a reference direction in a horizontal plane and that further rotatably rotatably on a / in the Polarmessgerät is arranged, which is rotated together with the polar gauge relative to the reference element about a vertical axis, wherein by means of at least one optical measuring device, in particular electro-optical measuring device, the coincidence of the orientation of the rotary member is measured with the reference direction of the reference element.

Reference element and rotating element may be used in the embodiment e.g. to

Holding device and / or the polar meter to be separate components that are attached to these or are fastened or at least rotatably coupled. However, these elements can also be an integral part of

Holding device and / or polar gauge form, e.g. the reference element as an integral part of the holding device and the rotary element as an integral part of the polar measuring device. It is essential for all embodiments only that the electro-optical measuring device has an optical beam path and both rotary element and reference element are at least partially incorporated in this beam path, e.g. in that one or both of the

Elements carry or form at least one component of the measuring device, so that changes by rotation of at least one of the elements of the beam path of the measuring device. As a supporting element reference element / rotating element may be formed, for example, as a rod, plate or other support structure. The physical training of these elements is not limited by the invention. An optical measuring device may also be formed at least partially integrally in the holding device and / or the polar measuring device. However, there will always be a part of the beam path of the measuring device which extends between the polar gauge and the holding device or between the reference element and the rotary element in order to achieve an influence on the beam path by a relative rotation.

There is thus the possibility according to the invention of using a polar measuring device, for example a laser scanner, in a first horizontal plane to create a reference measurement, in particular a three-dimensional image recording, which is based on the set reference direction, which is predetermined by the reference element.

For this purpose, a reference element may be attached to a part of the holding device remaining stationary during the measurement, e.g. a tripod, to be attached. It can be provided that the reference direction is defined solely by the attachment or it can also be provided in one embodiment that the reference element about a vertical axis of rotation first to the holding device can be rotatably adjusted in a desired reference direction and then rotatably connected to the holding device is to fix this reference direction.

According to the invention, it is then provided for a first measurement, the

Polar gauge, in particular a laser scanner, align by rotation about the vertical axis such that a match of the orientation of the rotary element, which is connected to the polar gauge, given with the reference direction of the reference element, which according to the invention by an optical measuring device, in particular electro-optical

Measuring device, is measurable and in particular can be signaled.

Thus, e.g. Measurement taken in a first plane, in particular a three-dimensional one recorded aboveground with a laser scanner

Image representation a reference to the specified reference direction of Reference element and there is then still the possibility of further data acquisition with the polar gauge, in particular more

Image captures with a laser scanner to make in other horizontal planes, for example after driving into a manhole, for which it is intended to determine a match of the orientation of the rotary element with the reference direction of the reference element at each measurement by means of the optical measuring device and thus measured values, in particular a 3D image representation to detect in another horizontal plane, which is correlated with the previous measurement in terms of orientation.

If, in the optical channel measurement application, a three-dimensional image obtained from a channel depth is considered, the course of underground channels or the orientation of the channel can be considered

Canal mouths are placed in a relation with an above-ground

Picture showing, for example, the buildings around the manhole to which the underground canals run. For example, with respect to a laser scanner, a null direction, i. a rotation angle about the vertical axis of rotation of the laser scanner are set, which can be achieved in all adjustable horizontal planes of the laser scanner by displacement of a holding element of the holding device, such as a tripod column.

For example, it is thus possible to record a single aboveground image, with a reference orientation, for example, as a zero degree position and thus as the start of the vertical rotation, and at least one, possibly several measured value images, in different horizontal planes

Entering into a vertically extending shaft, so that each of the three-dimensional all-round views gained there in the same

Nullgradrichtung starts as a reference orientation or on the

Reference orientation can be recalculated when in each of the

adjusted horizontal planes before recording or even during recording, the coincidence of an orientation of the rotary member with the Reference direction of the reference element is detected by means of the optical measuring device.

Here, it is a significant advantage of the invention that the coincidence of the orientation of the rotary element with the reference direction of the

Reference element is purely optically with an optical measuring device and thus eliminates any mechanical coupling between these elements.

In addition, it is possible to form by means of an optical measuring device at least one optical measuring section of the measuring device in the vertical direction between the rotary element and the reference element, so that this optical measuring section can be used to determine the correspondence between the orientation of the rotary element and the reference direction,

regardless of what altitude the polar gauges relative to

Reference element occupies. This independence results according to the invention by the vertical measuring section, which changes in a change in the horizontal plane of the Polarmessgerätes at best in length, but not in the direction. According to the invention, therefore, the coincidence of the orientation of the rotary element with the reference direction of the reference element for all possible Absenktiefen the polar gauge, in particular the laser scanner, can be determined.

According to the invention, it is considered to be particularly advantageous if the optical measuring device is formed by at least one light source and at least one light detector, wherein between the reference element and the rotary element at least one measuring section as Lichtpropagationsstrecke

is formed, in which the at least one light beam passing through the

at least one light source is generated, propagated vertically in a region between reference and rotary element and wherein the at least one light detector or a downstream electronics in a match of

Alignment of the rotary element with the reference direction of the reference element generates a match signal. Such a match can preferably present when the at least one vertically propagating light beam at least partially meets the at least one light detector, preferably in a predetermined position.

It is irrelevant for the measurement and the device or the method according to the invention, whether the at least one generated light beam from

Promotes reference element in the direction of the rotating element and thus also stationary due to the stationary arrangement of the reference element or whether propagated in the reverse direction, the at least one light beam from the rotary member in the direction of the reference element and thus can be moved with the rotary member of the light beam, in particular by a vertical Axis.

It is essential in each case that only in a certain angular position of the relative rotational position between the reference element and the rotary element, the at least one light beam strikes the at least one light detector and a

Match signal generated.

Such a match signal can also be transmitted between the rotary element and the reference element, depending on which element an electronic system is provided for generating the signal. The transmission may e.g. wirelessly, e.g. by means of a Bluetooth connection or also optically e.g. about the light beam propagating between the elements.

In one possible embodiment, it can be provided, for example, that in the vertical direction between the reference and rotary element

propagating at least one light beam through a laser light beam

is formed, in this embodiment by means of a light detector, the

Correspondence between the orientation of the rotary member and the

Reference direction of the reference element can be determined.

For example, here a light detector or a downstream electronics generate a match signal, which results from the fact that the propagating in the vertical direction of light beam after passing through his Propagation distance between the reference and rotary element meets the light detector and thus this event is detected by measurement.

The correspondence between the orientation of the rotary element and the reference direction of the reference element can be carried out, for example, in the simplest version even with a single laser light beam propagated from a laser light source to a light detector in the vertical direction or by several light beams, each of which hit a detector, wherein alignment of the alignment can be obtained from the simultaneous occurrence of a match signal of all the detectors involved, each of the involved laser light beams propagating vertically, eg can be generated by its own respective laser light source or by a single laser light source after appropriate beam splitting.

In an alternative embodiment of an optical measuring device, it may be provided, for example, to use a camera as the light detector, with which within the camera image, in particular within a predetermined nominal position of the camera image, the occurrence of a light signal, e.g. a predetermined light pattern is detected, which is propagated or projected in the vertical direction between the rotary element and reference element and hits the camera.

For example, it may be provided here to fix a camera on the reference element and to rotate a light source with the rotary element (or vice versa) emitting a light bundle in the vertical direction, eg its cross section perpendicular to the direction of propagation describes a predetermined pattern and determine by image interpretation, when this pattern appears within the camera image in a predetermined target position. If this is the case, then the correspondence between the orientation of the rotary element and the reference direction of the reference element is given. Regardless of the specific design of light source and light detector, it is necessary in each case that at least the optical axis of an emitted light beam, if necessary. Also, the optical axis of the light beam detecting light detector are aligned in the measurements exactly vertical. For this purpose, it can be provided, for example, that each light source and / or each

Light detector self-leveling are arranged on the reference element or

Rotary element to automatically ensure this necessary vertical alignment of the respective optical axes. The optical axis of a divergent light bundle can be understood to mean, in particular, the angle bisector between the marginal rays of the bundle.

In a possible alternative embodiment of the device it may

be provided that, for example, the rotary member is fastened or fixed to a device part of the polar gauge, which in the measuring operation of the

Polarmessgerätes to the vertical axis of rotation and the holding device is rotationally fixed and that the rotary member is rotatable in the reference direction before the start of a measured value with the Polarmessgerät, for example, by hand or automated by a motor drive, and it may then be provided in a preferred embodiment that the optical

Measuring device is arranged to signal the conformity of the orientation of the rotary element with the reference direction of the reference element. The attachment to the non-rotating during the measurement device part can be done directly on this or indirectly via an element that is non-rotatable with the device part, e.g. on a holding element, such as the stand rod.

In a motorized embodiment of this variant, it may be provided to arrange a motor between the stand rod and the device not rotating part measuring device with which, in particular automated, the non-rotating in operation device part are rotated relative to the same in operation not rotating stand rod before a measurement can to achieve the match between the orientation of the rotary member and the reference direction. In a manual or motorized adjustment of the rotary element in accordance with the reference direction of the reference element, it may be provided that the optical measuring device provides an acoustic or optical signal or triggering signal to the

Match the orientations to a user of the device. A user can then start a measurement acquisition in this detected match of the orientation of the rotary element and the reference element. By a triggering signal, the measured value recording can also be started automatically, if previously the motor matching the alignment of the rotational element was found with the reference direction.

It can also be provided that by means of a motor arrangement of stationary during a measurement about the vertical axis of rotation of the polar meter device part is rotated relative to the reference element or to the holding device motor, the drive of the motor for rotating takes place until the optical measuring device the Matched alignment of the orientation of the rotary element with the reference direction, wherein in this

Moment the control of the motor is turned off and the rotary member remains in the position thus found, after which the measured value detection can be started with the polar gauge, either manually or just as automated.

In such an embodiment, it may be provided, for example, that the rotary element together with the polar gauge, for example by

Displacement of a holding element of the holding device, e.g. a pendulum held tripod column can be set at different distances to the reference element, so that depending on the distance between the rotating element and reference element, the optical Lichtpropagationsstrecke between the rotating element and the reference element changes in length. However, this is not a problem because due to the exact vertical orientation of

Lichtpropagationsstrecke and a preferably swinging suspension of the Polar measuring device ensures that the Lichtpropagationsstrecke is exactly parallel to the axis of rotation of the polar gauge.

This is a particular advantage of the device and the method according to the invention, as independent of the distance between the rotating element and

Reference element and thus independent of the altitude of the

Polarmessgerätes relative to the holding device always with the same optical measuring device, the conformity of the orientation of the rotary member with the reference direction can be detected by measurement, since in this embodiment, the optical measuring device, in particular the length of

Propagation line automatically adjusts.

In another embodiment, it may also be provided that the

Rotary element and the reference element in the vertical direction are stationary relative to each other, therefore, the rotating element in a change in the altitude of the polar gauge, e.g. by adjustment or displacement of a

Holding element, in particular a tripod column, does not change its own altitude.

In this case, it is then further provided that the rotary member is rotationally coupled to a displaceable in the vertical direction of the holding device holding device, such as a tripod column, a tripod, which means that rotation of the stand column and the rotary member relative to the reference element is rotated, for example when Polar gauge is rotated together with the tripod column about the vertical axis, either manually or automatically motorized.

In such an embodiment, it may further be provided that the

Retaining element in the vertical direction is displaceable through the rotary member. Thus, therefore, can be rotary element and retaining element, in particular the pillar, in this embodiment in one dimension, namely in the height direction move relative to each other, wherein upon rotation, the rotary member is coupled to the stand column.

For example, this can be achieved by a stand column being in operative connection with its mantle surface with the rotary element, e.g. a

Longitudinal groove, in which engages a projection of the rotary element, so that in a longitudinal displacement of the pillar, ie a shift in

Height direction, the tripod column can be pushed past the rotary member, however, when rotating about the vertical axis, the rotary member is carried by the existing engagement.

In such a design of the device according to the invention, this can for example be mounted completely above ground on a holding device, in particular on a stand, which due to the constant, in particular small distance between the rotary member and the reference element a high

Measuring accuracy guaranteed, however, the coupling active connection between the rotating element and tripod column in a rotation about the vertical axis caused.

In another alternative embodiment, it may also be provided that the rotary member is attachable to a device part of the polar gauge, which is rotated in the measuring operation of the polar gauge about its vertical axis of rotation and relative to the holding device, wherein the rotary member during a measured value acquisition with the polar gauge together with the rotating device part at least once through the reference direction

is rotatable, wherein the optical measuring device is arranged to signal the coincidence of the orientation of the rotary member with the reference direction of the reference element during rotation.

In this embodiment, it does not require a prior adjustment of the

Polarmessgerätes before the start of a measurement such that the orientation of the rotary element coincides with the reference direction of the reference element. Rather, automatically during a measurement in which the rotating element with the rotating part of the polar gauge rotates about the vertical axis, automatically detected by the optical measuring device and a downstream electronics when a match between the orientation of the rotary member and the reference direction of the reference element is present and signaled by a generated signal.

This signal of coincidence of the two orientations can

For example, together with the measured values, which are detected by the polar gauge, recorded and stored, so that within the measured values of the polar gauge a pair of measured values is identified, which was taken at the time of coincidence of the orientation of the rotary element with the reference direction of the reference element, so that all measurements on the angle thus determined in the horizontal plane can be converted as a starting angle.

For this purpose, it may be provided, for example, that the signal which provides the optical measuring device or downstream electronics is supplied to an interface of the polar measuring device so as to associate the directional reference with at least one measured value pair of polar coordinates. Since this can be done with the above-described channel application both in an above-ground three-dimensional recording with a laser scanner as well as at least one underground recording, it is possible to use the measured value pairs identified in the measured values

Correlate images with respect to their direction in the horizontal plane, e.g. by converting the angles in the horizontal plane to a respective starting angle, which is identified by the generated signal.

If it is provided in a laser scanner to sample the angles in horizontal and vertical direction in time steps, it may therefore also be provided to detect the coincidence signal of the alignments between the rotary element and reference element in time and therefore over the time stamp both in the signal of the measuring device invention Device as well as the polar gauge those horizontal

In particular, to find vertical measuring angle of the polar gauge, which were detected at the time of coincidence of the orientation of the rotary member and the reference element.

Particularly in this embodiment, in which the correspondence between the orientation of the rotary element with the reference direction of the reference element quasi "on the fly" during the measured value detection is determined, the rotary element will be arranged together with the polar gauge in the vertical direction relative to the reference element slidably, so that However, due to the vertical propagation of the at least one light beam within the optical measuring device, this is not critical because of the displacement of the holding element, in particular of a stand rod of a stand.

In an embodiment of the optical measuring device with at least one

Laser light source and at least one laser light detector may be provided that due to the cross section of the laser light and the overlap with a detector surface, this detector surface provides a spatial resolution to detect the position of the projected laser spot of vertically propagating laser light beam within the total area of the light detector and so. evaluate when the laser spot occupies a predetermined target position.

For this purpose, for example, a light detector may be formed as a planar sensor with a spatial resolution of a plurality of pixels, so that, for example, such a laser detector by a two-dimensional

Camera chip can be realized.

Furthermore, there is also the possibility of a light detector as

Quadrant detector to form so the relative position between the

projected light spot of the laser beam relative to the individual Determine detector quadrants by determining the light intensity recorded in each quadrant.

Likewise, any other arrangement can be used as a light detector, which allows to determine the position of a projected laser spot within the light detector with sufficient accuracy and from this

Generate match signal on the basis of which the coincidence of the orientation of the rotary element and the reference direction of the

Reference element can be signaled.

In one possible embodiment, it may also be provided between

Reference and rotating element each form a plurality of vertical light beams, in particular a plurality of vertical laser beams and each laser beam to assign at least one light detector, as described above, each of the laser beams can be generated by a separate laser light source or even after beam splitting by a single laser light source.

Here, for example, there is the possibility of the light detectors and / or

Light sources all in a line, which e.g. the axis of rotation of the

Polar gauge is cutting. In an alternative embodiment, the arrangement may also be selected such that the line on which the respective

Light detectors and / or light sources, the axis of rotation of the

Offset polar gauge, which is an acentric arrangement of

Reference element and / or rotating element with respect to a holding element of a holding device, in particular a tripod column allowed.

When using a plurality of light beams, in particular laser light beams, it may be provided regardless of the number of these generating laser light sources that the intersections of the laser beams with a horizontal plane are all in line, which according to the aforementioned first embodiment, the axis of rotation of the polar gauge or according to cuts the second embodiment is offset to the axis of rotation of the polar gauge just as the light detectors.

In yet another embodiment, it can also be provided that with the at least one laser light source at least one vertically propagating light beam is generated, which is fanned out in a plane parallel to

Rotary axis of the polar gauge is or particularly preferred

Embodiment in which the axis of rotation of the polar measuring device is arranged.

For example, such a fanning can be generated by a cylindrical lens or a cylindrical concave mirror which is arranged in the propagation path of a laser light beam. In such a case, it may be provided to detect the example of the reference element in the direction of the rotary element or vice versa projected line of the laser beam by means of a plurality of light detectors arranged in a line or a line detector whose detector line exactly coincide in agreement of the orientation of the rotary element and reference element Direction of the projected

Laser light line is located. Accordingly, all generate in this line

Light detectors or the line detector in total with all its

photosensitive elements an output signal, so this is the

Agreement of the orientation of the rotary element and reference direction of the reference element determined.

The device according to the invention also has the further advantage that it can be used with already existing measuring devices comprising a tripod and a laser scanner, since according to the invention

Devices according to a particular advantage retrofitted to such

Measuring arrangements are.

For example, only one reference element must be firmly connected to the tripod, in particular the above-ground part of a tripod, whereas, for example, the rotating element is attached directly to the laser scanner, either at its rotating or non-rotating device part.

Thus, by attaching these elements to such an existing measuring device carried out an appropriate retrofit, which the

Transmission of the reference direction of the reference element from the above-ground side of the tripod easily due to the optical measuring device in depth to a laser scanner at the bottom of a tripod column allowed.

Possible embodiments of the invention will be described in more detail below, wherein the discussed figures omitting the representation of the polar gauge and the holding device, so for example a

Laser scanner and a tripod to its holder only the

Reference element, the rotary member and the optical measuring device comprising at least one light source and at least one light detector describe.

Figure 1 shows a simple arrangement of a reference element 1 which is fixed in place e.g. aboveground is attachable to a tripod, which is a

Laser scanner on his tripod column carries. The fixed attachment of the reference element 1 remains this after setting up the tripod in its once set position, which is either directly defined by the erection of the tripod or e.g. is defined by a user by rotation of the

Reference element relative to the tripod in a desired position, which is then fixed.

In the arrangement shown here, a reference direction is defined, which results for example from the intersection of the axis of rotation 2, which may correspond to the vertical axis of rotation of the laser scanner or the tripod column, which is mounted on the tripod pendulum with the reference element 1 and the location of here attached to the reference element 1 light source, in particular laser light source, 3. The connecting line between this intersection and the light source 3 provides Accordingly, a reference direction in a horizontal plane, which is symbolically represented by the arrow 4 here. This reference direction in a horizontal plane, namely the one in which the reference element lies, can define the zero-degree direction in a laser scanner, for example, from which a laser scan is started. Here is the exact direction in terms

Directional parameters such as angle data in the earth coordinate system uninteresting.

To start a scan, it is provided here, the rotary element 5, which is attached to the laser scanner, in particular to its non-rotating during the measurement part, by rotation of the not yet measuring

Laser scanner to rotate about the axis of rotation 2 until its detector 6, which has the same radial distance from the axis of rotation 2 as the light source 3 is arranged on the reference element, that of the light source 3 in the vertical direction to the rotary member 5 projected light beam, in particular Laser light beam 7 impinges on the photosensitive surface of the detector 6 and thereby a match signal is generated, for example by

Measurement of the light intensity, which is measured by the detector 6, so that this coincidence signal indicates when the rotary member 5 a

Alignment according to the arrow 8, which coincides exactly with the reference direction of the arrow 4 of the reference element.

In the arrangement shown here, an orientation of the rotary member 5 is defined, e.g. results from the intersection of the axis of rotation 2, which may correspond to the vertical axis of rotation of the laser scanner or the tripod column, which is mounted pendulum on the tripod with the rotary member 5 and the location of here attached to the rotary member 5 detector 6. The connecting line between this intersection and the detector 6 thus represents the orientation 8 of the rotary element 5,

After achieving this agreement, which can be achieved manually or with a motor drive for rotating the laser scanner relative to the reference element 1, the laser scan can thus be started, which then in Zero-degree direction relative to the horizontal plane begins, which lies in the direction of the reference direction 4 or at least to a fixed position occupies.

In this configuration, for example, an above-ground image with the

Laser scanner recorded, so any subterranean image, which is taken after lowering the laser scanner in a channel, be set in relation to this image of the above-ground area, characterized in that prior to each recording of a subterranean image the same orientation 8 of the rotary element

5 in the direction of the reference direction 4, which can be found for each further measurement in the same way as before by the fact that the propagating in the vertical direction of the light beam 7 to the detector 6 of

Turning element meets.

In addition to the alignment of the laser scanner described here before the start of a measurement, it may alternatively also be provided that the rotary element 5 is mounted on the part of the rotary body 5 rotating about the vertical axis 2 during a measurement

To attach a laser scanner so that a measurement without prior alignment of the laser scanner can be started in any position and at the same time the signal of the optical measuring device, here in particular an intensity signal of the laser scanner at the measured value

Light detector 6 is recorded, which is recorded along with the measured values of the laser scanner, then during the measurement

determine when the match between the directions 8 and 4 of the rotary element and reference element is given, namely in particular when the intensity maximum of the measured light intensity to a detector

6 occurred.

Since this coincidence signal, here in particular the intensity maximum, is recorded in each individual laser scan, it is accordingly readily possible to normalize the individual three-dimensional image recordings of the laser scanner to the one pair of angles in which the coincidence signal of the light detector 6 simultaneously detects has been. Even so, according to the invention, each underground channel receptacle can be correlated with respect to its direction to an aboveground receptacle which, for example, shows the buildings surrounding the manhole into which the laser scanner on the stand column has been lowered.

The further figures essentially describe modifications of the optical measuring device with the same possible arrangement of reference element 1 and rotary element 5 with regard to holding device or tripod and polar measuring device or laser scanner.

FIG. 2 is modified relative to FIG. 1 merely in that, in the orientation 8 of the rotary element 5, which passes through the intersection of the

Rotary axis 2 is given with this element and the detector 6, not only a detector 6 is arranged, but also another detector 6 ', which is arranged around the rotation axis 2 by 180 degrees offset to the light detector 6. Accordingly, there are two positions in which an overlap between the light spot produced by the light beam 7 and an illuminated detector 6 or 6 'results, whereby two mutually antiparallel

Orientations relative to the reference direction 4 of the reference element 1 can be detected.

Similarly, Figure 3 shows the arrangement of two light sources 3 and 3 ', respectively, in an 80 degree orientation about the axis of rotation 2 on

Reference element 1 are arranged and in each case downward to the rotary member 5 a light beam 7 and 7 'emit, wherein the rotary member 5 in this embodiment, only a detector 6 is arranged, in conjunction with the intersection of the axis of rotation 2 and the rotary member 5, the orientation of the eighth defined the rotary element.

In this embodiment as well, two mutually antiparallel orientations are thus detected, which lie parallel or antiparallel to the reference direction 4 of the reference element and result from the fact that the one detector 6 once with the light beam 7 of the light source 3 and the other time with the light beam 7 'of the light source 3' is covered.

In order to be able to distinguish these two orientations, since only one agrees with the desired reference direction, it can e.g. be provided, the light beams or their emitting light sources different and thus to design the light beams distinguishable.

Quite generally and independently of the embodiments described here, it can thus be provided for all embodiments in which at least two light beams propagate vertically within the at least one optical beam path of the at least one measuring device that the at least two light beams are configured distinguishable from each other. For this, e.g. the light beams have different intensity or at least one of the light beams may e.g. be modulated, for example, temporally or spatially. The detectors or their downstream electronics can thus

For example, be established on the existence of such

In particular, a match signal is output only when a searched distinguishing feature (temporal / spatial modulation or intensity, etc.) has been found in the incident light beam.

The sought correct orientation of the rotary element to the reference direction is thus given only if of a plurality of distinguishable light beams of each of a detector associated light beam impinges on this and is detected. Accordingly, it may be provided to arrange at least one such association between at least one of the plurality of distinguishable ones

To make light beams and at least one detector. There is thus according to such an assignment at least a pair of light beam (or this generating light source) and detector, which upon the arrival of the light beam to the detector, the correct orientation of the rotary element to

Display reference direction. FIG. 4 also shows an embodiment in which, with respect to FIG. 3, another detector 6 'is also arranged on the other side of the rotation axis 2 and thus oriented 180 degrees to the detector 6, so that here

Match signal is generated when both detectors 6 and 6 'with the light beams 7 and 7' overlap.

The distinction as to whether the desired parallel match occurs

(Light beam 7 of the light source 3 strikes detector 6 and light beam 7 ^' of light source 3 ^' strikes detector 6 ^' ) or the anti-parallel position offset by 180 degrees (light beam 7 of light source 3 strikes detector 6 ^' and light beam 7 ^' of FIG

Light source 3 ^' applies to detector 6) is present, it can also be done here, for example, that the light beams 7 and 7 ^{' have} different intensities or the light source 3 ^' temporarily issued or modulated or other distinctness is present. Here, for example, the light beam 7 may be assigned to the detector 6 and the light beam 7 ^'to the detector 6 ^' . Thus, if the light beam 7 impinges on the detector 6 ^' , these form an unassigned pair of light beam and detector and no match signal is generated since the light beams 7 and 7 ^{' are} distinguishable.

The reference direction 4 can be advantageous in this arrangement by the

Connecting line between the light sources 3 and 3 ^'are defined.

Accordingly, the orientation 8 of the rotary member by the

Connecting line between the two detectors 6 and 6 ^' defines.

For the definition of a direction (reference direction of the reference element or orientation of the rotary element) may be provided with general validity preferred for all, not shown embodiments that the respective direction between two points of each element is defined, of which at least one part of the Beam path of the optical measuring device is. A direction definition can thus take place, for example, by the point in which the vertical axis of rotation of the polar measuring device or of the stand rod is the respective one Element intersects and the point at which a detector or a light source or other optical element of the beam path is arranged on / on this element. The direction can thus also be defined by two points, which are each part of the beam path, for example by the fact that in these points light source / detector and a mirror or other deflecting element are arranged.

In the embodiments of FIGS. 1 and 4 shown here, provision is made in each case for the light sources, in particular laser light sources, to be arranged on the upper reference element 1 and for their light beams to propagate vertically downwards to the rotary element 5, which is then brought into alignment with the reference direction, which is defined by the reference element 1, are rotated until the detectors provided on the rotary element indicate an intensity signal. Of course, there is also the possibility here that the light source / n 3 on the rotary member 5 and / the

Detector / s 6 are attached to the Referenzelement.1.

In contrast, for example, Figure 5 shows another embodiment in which the light source and the detector on the same element, here on

Rotary element 5 are arranged. In this case, the measuring device is configured such that the light source 3 and the detector 6 are arranged directly next to one another at a distance from the axis of rotation 2 on the rotary element 5 or even formed by the same component, wherein the propagation distance of the light in this embodiment is vertical from below is above the reference element, on which a retroreflector 9 is arranged, which reflects the received light beam 7 as a light beam 7a exactly parallel, possibly with a lateral offset, in the direction of the rotary member 5 on the arranged next to the light source detector. 6

Exactly at the moment when therefore the light detector 6 measures a light signal, the orientation 8 of the rotary element 5 is coincident with the

Reference direction 4 of the reference element 1, wherein the reference direction Here now results from the connecting line from the intersection of the axis of rotation 2 with the reference element 1 in the direction of the retroreflector 9 and the orientation of the rotary member 5 is defined by the line connecting the

Intersection of the axis of rotation 2 and the rotary member 5 and the light source 3 and the detector. 6

Of course, there is also the possibility here of fixing the light source 3 and the detector 6 on the reference element 1 and the retroreflector on the rotary element 5.

The embodiment of FIG. 6 differs from that of FIG. 5 again in that the optical measuring device is provided twice here, namely oriented 180 degrees to one another around the axis of rotation 2.

Thus, a match signal is produced if of both

Detectors 6 and 6 'the incident light of the light source 3 and 3' after

Passing through the light propagation distance towards the retroreflector and back takes place.

FIG. 7 shows a modified embodiment, in which a light source 3 is arranged on the rotary element 5 and at a distance from the axis of rotation, so that in turn the orientation 8 of the rotary element 5 is defined, but the entire Lichtpropagationsweg next to two vertical

Also includes a horizontal path portion. Here, first, the light from the light source 3 is vertically upward to

Reference element 1 out to be deflected from there by means of a mirror, in particular deflecting prism, 10 in the horizontal direction to a point which is rotated at 180 degrees about the rotation axis 2 on the other side of the reference element 1, then with this mirror, in particular

Deflection prism, 10 'turn to be reflected in a vertical direction downwards in the direction of the rotary member 5, on which also rotated by 180 degrees about the rotation axis 2, the detector 6 is arranged. Thus, an alignment 8 of the rotary element is defined between light source 3 and detector 6, as well as between the mirrors 10 and 10 'the reference direction of

Reference element. It can be seen that only the light beam 7 impinges on the detector 6 after its reflections, if the alignment 8 of the rotary member 5 exactly with the reference direction, defined by the two mirrors, in particular deflection prisms, 10 and 10 'matches.

FIGS. 8 and 9 furthermore describe an embodiment in which the respective rotary element 5 has respective detectors 6 in an arrangement of 90 degrees to each other within its horizontal plane, which detectors can therefore be rotated together with the rotary element 5 about the axis of rotation 2. In FIG. 8, the reference element 1 has a single light source, as in FIGS. 1 and 2, whereas in FIG. 9 two light sources 3 and 3 'are provided at 180 degrees to one another, corresponding to the same arrangement of FIGS. 3 and 4.

Accordingly, conformity signals between the orientations of rotary element 5 and reference element 1 also result here whenever a light detector in FIG. 8 or two light detectors in FIG. 9 simultaneously coincide with the light beams 7. With particular reference to FIG. 8, it may be provided here that a match signal is to be regarded as detected only when it originates from a very specific one of the total of a plurality of detectors 6 here. If a light signal is detected from another one of the detectors 6 than predetermined, an automatic device may calculate therefrom, in which direction e.g. the rotary element must be automatically rotated by a motor to rotate the rotary member 5 in the correct orientation, which by the connection between

Intersection of the rotation axis 2 and rotary member 5 and the predetermined detector 6 is defined. It is thus achieved the goal that after a maximum of 180 degrees rotation of the laser scanner exactly in the right desired

Reference direction can be aligned. Of course, the number of detectors 6 can be further increased. FIGS. 0 and 11 also show, as further developments, the possibility of providing a plurality of light sources 3 or detectors 6, all of which are arranged on one side in relation to the axis of rotation 2 in FIG.

FIG. 11 also shows, in comparison with FIG. 0, the further development that at least the detectors 6 are arranged on a common line on both sides of the axis of rotation 2 and thus define the orientation of the rotary element 5.

FIG. 12 shows the same arrangement of light sources 3 and detectors 6 in each case in a line which intersects the axis of rotation 2, so that here each one

Light source 3, a respective vertically underlying detector 6 of the

Rotary element 5 is assigned. A match of the alignment between reference element 1 and rotary element 5 is achieved here when all detectors 6 receive a corresponding light signal.

FIGS. 3 and 14 show two different embodiments in which, with reference to FIG. 13, only one side of the axis of rotation 2 and with reference to FIG. 14 are offset on both sides of the axis of rotation 2 by 180 degrees relative to one another at the reference element 1 at a distance from each other Rotary axis 2, a light source 3 is arranged, which, however, in the present case instead of a light beam having a propagation direction substantially constant cross-sectional area now a line 3a in the direction of the rotary member 5, wherein it is provided on the rotary member 5 to provide an elongated sensor 6 whose geometric longitudinal extent intersects the point of intersection of the axis of rotation 2 with the rotary element 5.

FIGS. 15 and 16 describe further embodiments in which it is intended to generate two vertically propagating light beams around the axis of rotation 2, with which an associated detector 6 is illuminated in each case when the orientation of the rotary element 5 and the direction of the

Reference element 1 are consistent. It is provided, according to the figure 15 to the reference element 1 to arrange a light source 3, by means of in vertical direction, a light beam 7 is generated, which is divided at the beam splitter 11 into two beams, one of which propagates further in the vertical direction and the other is deflected in the horizontal direction to a lying on the other side of the rotation axis 2 mirror, in particular deflection prism, 10th , with which in turn the light beam is reflected downwards in the vertical direction, so that here both generated partial light beams 7 only one

Indicate coincidence of the orientation of rotary element 5 with the reference direction when both hit the detectors 6.

In contrast, FIG. 16 shows an embodiment in which an original light beam 7 is collinearly fed to the rotation axis 2 of the apparatus and is deflected by a beam splitter 1 in two opposite directions to respective mirrors, in particular deflection prisms 10, which are at 180 degrees about the rotation axis 2 are arranged oriented to the reference element 1, so that only by the reflection of these mirrors 10, the vertically downwardly propagating light beams 7 are generated, which meet at a direction match on the respective detectors 6 on the rotary member 5 and thus produce a match signal.

FIG. 17 further shows that, in a view in the direction of the axis of rotation 2, the arrangements of light sources 3 and / or detectors 6 either on

Reference element 1 or the rotary member 5 may lie on a line L which intersects the axis of rotation 2 exactly. In contrast, FIG. 18 shows that the connecting line between the light sources 3 and the light beams 7 in a horizontal section is parallel to the reference or rotary element or the light beam

Detectors 6 are located on a common line L, which is spaced from the axis of rotation 2. This creates the possibility of arranging the reference element and the rotating element and, in particular, the light source / s and the detector / s, acentrically with respect to the axis of rotation, which can be structurally advantageous.

In all embodiments, it may be provided that an evaluation electronics downstream of the one or more light detectors determines when a the coincidence of the alignments between reference and rotary element defining overlap between the laser spot and the light detector is given. Here, for example, a control loop can be implemented, with which the deviation between a desired position of the laser spot on the detector and the current actual position is minimized, after reaching this goal, the coincidence of the orientation of the rotary element is given with the reference direction of the reference element. Accordingly, such an alignment can also be fully automated by a motor control, until the match signal is generated by the transmitter.

In another embodiment, it may also be provided, the

Match the alignment e.g. determined by polarized light which is projected either by the reference element in the direction of the rotary element or in the opposite direction and to the respective

downstream element by a polarizer downstream

Light intensity detector is detected. Here, a maximum or a minimum light intensity is detected when the polarization direction of the polarizer is the same direction or perpendicular to the polarization direction of the vertically propagating light. Thus, this criterion of minimum or maximum intensity can also be evaluated at the detector during a rotation about the axis of rotation 2 in order to determine the direction coincidence between the rotary element and the reference element.

Claims

claims

1. Device for directional calibration of a polar gauge, in particular a laser scanner, characterized in that it is a

Reference element (1) comprises that non-rotatably on a holding device of the Polarmessgerätes, in particular on a tripod, fastened / fastened and by which a reference direction (4) is defined in a horizontal plane and a rotary member (5) that is rotatably with the Polarmessgerät and together with the polar gauge relative to

Reference element (1) about a vertical axis (2) is rotatable and at least one optical measuring device (3, 6, 3 ^' , 6 ^' ) is provided, by means of the coincidence of alignment of the rotary member (5) with the

Reference direction (4) of the reference element (1) is measurable, in particular can be signaled.

2. Device according to claim 1, characterized in that the

Rotary element (5) on a holding element and / or device part of the

Polarmessgerätes fastened / fastened, which is in the measuring operation of

Polarmessgerätes to the vertical axis of rotation and the holding device is rotationally fixed and the rotary member (5) before the start of a measured value with the polar meter in the reference direction (4) is rotatable, in particular by hand or automated, in particular wherein the optical

Measuring device (3, 6, 3 ^' , 6 ^' ) is arranged, the coincidence of the orientation of the rotary element (5) with the reference direction (4) of the

Signal reference element (1).

3. Device according to one of the preceding claims, characterized

in that the rotary element (5) and the reference element (1) are stationary with respect to each other in the vertical direction, wherein the rotary element (5) is displaceable with a vertically displaceable holding device

Retaining element, in particular with the stand rod of a Statives, is rotationally coupled and the retaining element in the vertical direction displaceable by the rotary member (5) is passed.

4. Apparatus according to claim 1, characterized in that the

Rotary element (5) is fastened / fixed to a device part of the polar gauge, which is rotatable / rotated in the measuring operation of the polar gauge about its vertical axis of rotation and relative to the holding device and the rotary member (5) during a measured value with the polar meter together with the rotating device part at least Once through the reference direction (4) is rotatable, in particular wherein the optical measuring device (3, 6, 3 ^' , 6 ^' ) is arranged, the match of

Alignment of the rotary element (5) with the reference direction (4) of

Reference element (1) to signal, in particular to the electronics of the polar meter.

5. Device according to one of claims 1, 2 or 4, characterized

characterized in that the rotary element (5) together with the

Polarmessgerät in the vertical direction relative to the reference element (1) is displaceable, in particular by displacement of a holding element, in particular the stand rod of a tripod.

6. Device according to one of the preceding claims, characterized

characterized in that the optical measuring device (3, 6, 3 ^' , 6 ^' ) is formed by at least one light source (3, 3 ^' ), in particular laser light source and at least one light detector (6, 6 ^' ), wherein between the reference element (1) and at least one light propagation path is formed in the rotary element (5), in which the at least one light beam (7, 7 ^' ) propagates vertically in a region between reference (1) and rotary element (5), wherein the at least one light detector (6, 6 ^' ) or a downstream electronics in a coincidence of the orientation of the rotary member (5) with the reference direction (4) generates a match signal, in particular where there is a match, if the at least one vertically propagating light beam (7, 7 ^' ) the at least one light detector ( 6, 6 ^' ).

7. Device according to one of the preceding claims, characterized in that for generating at least one in the vertical direction between reference (1) and rotary element (5) propagating light beam (7, 7 ^' ), in particular laser beam, the light source (3, 3 ^' ) and / or the

Light detector (6, 6 ^' ) or at least a part of whose / their optics is self-leveling.

8. Device according to one of the preceding claims, characterized

in that a plurality of vertical light beams (7, 7 ^' ), in particular laser beams, are formed between reference (1) and rotary element (5) and at least one light detector (6, 6 ^' ) is associated with each of the light beams (7, 7 ^' ), in particular, wherein the light detectors (6, 6 ^' ) each

Light beam (7, 7 ^' ) and the intersections of the laser beams with a horizontal plane all lie in a line which a. the axis of rotation (2) of the polar gauge intersects or b. is offset to the axis of rotation (2) of the polar gauge.

9. Device according to one of the preceding claims, characterized

characterized in that the at least one light source (3, 3 ^' )

at least one vertically propagating light beam (7, 7 ^' ) is generated, which is fanned out in a plane parallel to the axis of rotation (2) of the

Polarmessgerätes lies or in which the axis of rotation (2) of

Polar meter is located.

10. Measuring device comprising a holding device of a polar gauge, in particular a tripod and a polar measuring device attached thereto, characterized in that it comprises a device according to one of the preceding claims.

11. A method for directional calibration of a Polarmessgerätes, in particular a laser scanner, characterized in that a reference element (1) rotatably on / in a holding device of the Polarmessgerätes, in particular on / in a tripod, is arranged or is, wherein by the

Reference element (1) a reference direction (4) is defined in a horizontal plane and rotatably a rotary member (5) on / in the polar meter is arranged, which is rotated together with the polar gauge relative to the reference element (1) about a vertical axis (2) wherein by means of at least one optical measuring device (3, 6, 3 ^' , 6 ^' )

Correspondence of the orientation of the rotary element (5) with the

Reference direction (4) of the reference element (1) is measured.