US 11,454,499 B2Granted

Measurement method for a surface-measuring measuring machine

AssigneeLeica Geosystems AG

InventorsHeinz Lippuner, Urs Vokinger, Knut Siercks

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Abstract

Measurement method where a code projection which is dependent on a three-dimensional position of a code carrier relative to a sensor arrangement is generated on a sensor arrangement, and at least part of the code projection is captured. An angular position of the code carrier with reference to the defined axis of rotation is ascertained and a current measurement position of the measurement component relative to a base is determined, wherein, a position value for at least one further degree of freedom of the code carrier relative to the sensor arrangement is ascertained on the basis of the code projection and is taken into account to determine the current measurement position, and a relative position of the connecting element with respect to the holder and/or the deformation thereof is determined from the position value in the form of a change in shape or size.

Claims17

Dependent claims

A method for determining a measurement position of a surface-measuring measuring machine measuring a surface, the surface-measuring measuring machine comprising:

a base;
a measurement component for producing and maintaining a contact-making or contactless measurement connection to the surface to be measured, wherein the measurement component is connected to the base by at least one connection element;
at least one rotary encoder, which detects a rotation of the at least one connection element with respect to a receptacle and in each case has a code carrier and a sensor arrangement, wherein code carrier and sensor arrangement are rotatable with respect to one another about a defined axis of rotation as a first degree of freedom, wherein on the basis of a code projection on the sensor arrangement, said code projection being dependent on the three-dimensional position of the code carrier relative to the sensor arrangement, a rotational position relative to the defined axis of rotation and a position value for at least one further degree of freedom of the code carrier relative to the sensor arrangement for the at least one rotary encoder are determinable, wherein the position value is usable to determine a relative position of the connection element with respect to the receptacle;
and
an evaluation unit;
wherein the method comprises:
determining with the evaluation unit a measurement position of the measurement component relative to the base using the rotational position of the at least one rotary encoder and the relative position,
wherein the rotary encoder has at least two code carriers, which are rotatable about the same axis of rotation and are arranged at a distance from one another in a direction of the axis of rotation, and a position value is determined for each of the two code carriers on the basis of the respective code projection, wherein the combination of the position values of the two code carriers is used to determine a relative position of the connection element with respect to the receptacle, therein determine a change in length of the common axis or of a housing of the connection element and/or a flexure and/or a total movement of the connection element.

5 more elements

A measurement method for a surface-measuring measuring machine, comprising:

a base;
a measurement component for producing and maintaining a contact-making or contactless measurement connection to a surface to be measured, wherein the measurement component is connected to the base by at least one connection element;
at least one rotary encoder, which detects a rotation of the at least one connection element with respect to a receptacle and in each case has a code carrier and a sensor arrangement, wherein code carrier and sensor arrangement are rotatable with respect to one another about a defined axis of rotation as a first degree of freedom;
and
an evaluation unit;
wherein the method comprises:
generating a code projection on the sensor arrangement, said code projection being dependent on the three-dimensional position of the code carrier relative to the sensor arrangement, and detecting at least part of the code projection;
determining with the rotary encoder a rotational position relative to the defined axis of rotation of the code carrier on the basis of the code projection;
determining a position value for at least one further degree of freedom of the code carrier relative to the sensor arrangement for the at least one rotary encoder on the basis of the code projection, and using the position value to determine a relative position of the connection element with respect to the receptacle;
determining with the evaluation unit a current measurement position of the measurement component relative to the base using the rotational position of the at least one rotary encoder and the relative position,
wherein the rotary encoder has at least two code carriers, which are rotatable about the same axis of rotation and are arranged at a distance from one another in a direction of the axis of rotation, and a position value is determined for each of the code carriers on the basis of the respective code projection, wherein the combination of the position values of the two code carriers is used to determine a relative position of the connection element with respect to the receptacle, therein to determine a change in length of the common axis or of a housing of the connection element and/or a flexure and/or a total movement of the connection element.

8 more elements

Dependencies are inferred from the claim text.