Thz measuring method and thz measuring device for measuring a joint of a container
OwnerJan Hendrik BECKMANN, Markus HILDEBRANDTinventors
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Abstract
A THz measuring method and a THz device for measuring a container with a joint, in particular, a blow mold container with a pinch-off seam, where a THZ sensor is adjusted relative to a container region in multiple positions with different orientations of the optical axis, THz radiation is emitted as a non-parallel beam bundle from the THz sensor towards the container region, and THz radiation partially reflected on the interior surface and the exterior surface of the container area is received, and one or more of the characteristics of the joint are determined.
Claims17
A THz measuring method for measuring a container with a joint, including at least the following steps:
- positioning a container area made of a material transparent for a THz radiation and having a joint, and
- relative adjustment of at least one THz sensor in relation to the container region in multiple positions with at least partially different orientations of the optical axis of the THz sensor,
- in the multiple positions, emitting THz radiation as a non-parallel beam bundle from the THz sensor along its optical axis towards the container region and detecting THz radiation partially reflected on the interior surface and the exterior surface of the container area by the THz sensor, and creating data sets from the measuring signals and position data with the orientations,
- evaluating the data sets, where one or more of the following characteristics of the joint are determined:
- a length of the joint in its longitudinal direction,
- a width of the joint in a transverse direction perpendicular to the longitudinal direction,
- a layer thickness profile of the layer thickness in the longitudinal direction and the transverse direction,
- a ripple wall thickness of one or two ripples formed on an interior surface,
- a residual wall thickness in an indentation between two ripples, a joint angle of the joint on the interior surface in an indentation between two ripples.
A THz measuring device for measuring of a container with a joint, in particular, a blow mold container with a pinch-off seam, the THz measuring device comprising:
- a THz sensor configured to emit a non-parallel beam bundle along its optical axis, to detect reflected THz radiation, and to put out a measuring signal, an adjustment device for adjusting the at least one THz sensor in pre-defined positions and aligning the optical axis relative to a container,
- a controller means configured to receive the measuring signals and to create data sets from the measuring signals, position data of the adjustment device and orientation data of the THz sensor,
- an evaluation unit configured to determine one or more of the following characteristics of the joint from the data sets:
- a length of the joint in its longitudinal direction,
- a width of the joint perpendicular to its longitudinal direction,
- a layer thickness profile of the layer thickness in a longitudinal direction of the joint and in a transverse direction perpendicular to the longitudinal direction,
- a ripple wall thickness of a Welle of the pinch-off seam formed on an interior surface,
- a residual wall thickness in an indentation between the ripples,
- a joint angle of the joint on the interior surface between the ripples.
Dependencies are inferred from the claim text.