A device is disclosed for measuring the geometry of the inner wall of bores, drill holes and passages, which are optionally countersunk, and in particular for threaded, pin, and rivet connections of workpieces, said device comprising at least one optical sensor measuring towards the inner wall and capable of being introduced into the drill hole and rotated via a feed/rotating unit, wherein an auxiliary object is provided with a passage and rests on the surface of the workpiece, through which passage said sensor is inserted into the countersink and/or bore. The device is characterized in that the inner wall of the auxiliary object is provided with a structure and that the sensor scans said structure(s) while passing through the auxiliary object. The disclosure also relates to a corresponding method.

A device is disclosed for measuring the geometry of the inner wall of bores, drill holes and passages, which are optionally countersunk, and in particular for threaded, pin, and rivet connections of workpieces, said device comprising at least one optical sensor measuring towards the inner wall and capable of being introduced into the drill hole and rotated via a feed/rotating unit, wherein an auxiliary object is provided with a passage and rests on the surface of the workpiece, through which passage said sensor is inserted into the countersink and/or bore. The device is characterized in that the inner wall of the auxiliary object is provided with a structure and that the sensor scans said structure(s) while passing through the auxiliary object. The disclosure also relates to a corresponding method.

An inner circumferential length measuring device for a circular member includes a two-dimensional sensor disposed at a predetermined measurement position facing an inner circumferential surface of a circular member placed flat in an unrestrained state on a support. By the two-dimensional sensor being rotated about a rotation shaft of a predetermined position inward of the circular member, a separation distance from the two-dimensional sensor to the inner circumferential surface is measured by the two-dimensional sensor in a non-contact state with the circular member in a range of an entire circumference of the circular member. A calculation unit calculates an inner circumferential length of the circular member based on the separation distance measured and a distance from the rotation shaft to the two-dimensional sensor.

An inner circumferential length measuring device for a circular member includes a two-dimensional sensor disposed at a predetermined measurement position facing an inner circumferential surface of a circular member placed flat in an unrestrained state on a support. By the two-dimensional sensor being rotated about a rotation shaft of a predetermined position inward of the circular member, a separation distance from the two-dimensional sensor to the inner circumferential surface is measured by the two-dimensional sensor in a non-contact state with the circular member in a range of an entire circumference of the circular member. A calculation unit calculates an inner circumferential length of the circular member based on the separation distance measured and a distance from the rotation shaft to the two-dimensional sensor.

A method for determining an inner diameter of a sounding tube, which, for measuring the fill level of a fill substance located in a process space of a container, extends in the process space, or is placed alongside the container and connected with the process space. The method can be implemented in the case of a fill-level measuring device working according to the FMCW-principle. Besides the intermediate frequency of the difference signal, also its phase shift is ascertained, wherein the exact tube inner diameter can be determined based on the phase shift. An advantage of the method is that the fill-level measuring device with the help of the then exactly known tube diameter can be recalibrated and accordingly the fill level determined more exactly. The exact tube inner diameter does not have to have been previously known.

A method for determining an inner diameter of a sounding tube, which, for measuring the fill level of a fill substance located in a process space of a container, extends in the process space, or is placed alongside the container and connected with the process space. The method can be implemented in the case of a fill-level measuring device working according to the FMCW-principle. Besides the intermediate frequency of the difference signal, also its phase shift is ascertained, wherein the exact tube inner diameter can be determined based on the phase shift. An advantage of the method is that the fill-level measuring device with the help of the then exactly known tube diameter can be recalibrated and accordingly the fill level determined more exactly. The exact tube inner diameter does not have to have been previously known.

The disclosed embodiments include systems and methods for recording a pressure profile using a sensor connected to a flowline, generating a pressure pulse in the flowline by closing a valve connected to the flowline, calculating a first derivative and a second derivative of the pressure profile, and determining a parameter of the pressure pulse based on the first derivative and the second derivative of the pressure profile.

The disclosed embodiments include systems and methods for recording a pressure profile using a sensor connected to a flowline, generating a pressure pulse in the flowline by closing a valve connected to the flowline, calculating a first derivative and a second derivative of the pressure profile, and determining a parameter of the pressure pulse based on the first derivative and the second derivative of the pressure profile.

A test system for examining a hollow body, in particular a cylinder bore in an engine block, comprises a measuring apparatus comprising an elongate body and a plurality of sensors which are connected to the body and are set up to carry out a distance measurement. The test system also comprises electronic control means which are set up to move the measuring apparatus into a hollow body to be examined and to determine an internal diameter of the hollow body on the basis of distance measurement data from the sensors. In order to examine hollow bodies of different diameters, at least some of the sensors are in the form of movable sensors which can be moved relative to the elongate body of the measuring apparatus. The electronic control means are also set up to select a measuring position of the movable sensors relative to the elongate body on the basis of a hollow body to be examined. A calibration station is provided and the electronic control means are set up to carry out a calibration process for the movable sensors. A corresponding method is also disclosed.

A test system for examining a hollow body, in particular a cylinder bore in an engine block, comprises a measuring apparatus comprising an elongate body and a plurality of sensors which are connected to the body and are set up to carry out a distance measurement. The test system also comprises electronic control means which are set up to move the measuring apparatus into a hollow body to be examined and to determine an internal diameter of the hollow body on the basis of distance measurement data from the sensors. In order to examine hollow bodies of different diameters, at least some of the sensors are in the form of movable sensors which can be moved relative to the elongate body of the measuring apparatus. The electronic control means are also set up to select a measuring position of the movable sensors relative to the elongate body on the basis of a hollow body to be examined. A calibration station is provided and the electronic control means are set up to carry out a calibration process for the movable sensors. A corresponding method is also disclosed.