Isra Surface Vision Gmbh

Flachglas Aktiengesellschaft

Paul Weigt

Peter Paulus

Ulrich Pingel

Rolf Kubiak

Christian Ripperda

Hans-Jurgen Niklewski

Stefan Leute

The invention concerns an apparatus for determining a secondary image angle () of a light source () on a transparent object (). To achieve the objective of building a simple apparatus and to determine the secondary image angle () with higher measuring point densities even on transparent objects () with large surfaces in a quick, reliable manner with few movements, the apparatus includes an illuminating device (), which has multiple, simultaneously illuminating, punctiform light sources (), a two-dimensional target () with at least one camera (), whereby at least one camera () is set up to capture the positions of a primary image () and a secondary image () of multiple simultaneously illuminating light sources () at the same time, whereby the primary image () and the secondary image () of one light source () are generated on the target by one of the volume elements () of the transparent object illuminated by the light source (), and an evaluation device () is set up to determine the secondary image angle () of the respective volume element () of the transparent object () based on the positions of the primary image () and the secondary image (). Furthermore, a method for determining the secondary image angle is also specified.

Apparatus and method for determining a double image angle and/or a viewing angle

A method for determining a refractive power of a large-surface-area transparent object, such as a windshield, a visual aid, a cockpit glazing, a helmet visor, or the like, includes detecting a first imaging of a first line grating through the transparent object at at least one predetermined point of the object using a camera and determining a line spacing of the first imaging, the rotation of the lines relative to the first line grating or both through use of a computing unit on the basis of the first imaging at the at least one specified point and using the line spacing or rotation of lines to determine the refractive power at the at least one predetermined point of the transparent object.

Method for determining the refractive power of a transparent object, and corresponding device

The invention relates to device for measuring the thickness of a transparent sample (), particularly a glass strip or a glass pane, involving the use of: a first light beam (L), particularly a first laser beam, which strikes upon the front surface () of the sample () at a first angle of incidence (&#x3b1;); a second light beam (L), particularly a second laser beam, which strikes upon the front surface () of the sample () at a second angle of incidence (&#x3b1;), the first angle of incidence (&#x3b1;) and the second angle of incidence (&#x3b1;) being different, and; at least one detector () for detecting the light beams (L', L&#x2033;, L&#x2032;, L&#x2033;) of the first and second incident light beams (L, L) reflected by the sample, and for determining the position thereof. In order to also be able to carry out a correction for curvature, at least one incident light beam (L), which is essentially parallel to the first or second light beam (L, L), is oriented toward the front surface () of the sample (), and at least one detector () is provided for detecting a light beam (L&#x2032;) of the parallel light beam (L) reflected by the sample () and for determining the position thereof. The invention also relates to a corresponding method.

Device and method for measuring the thickness of a transparent sample

A windshield has a generally upright transparent panel, an array of horizontal and generally parallel heater conductors on the panel and having opposite ends, and respective conductive busses connected to the heater conductors at the opposite ends thereof. Thus electricity can be applied to the busses to pass current through the heater conductors and thereby heat the panel at the array. A pair of generally upright, generally parallel, and horizontally spaced antenna conductors on the panel extend across and connect at crossing locations to the heater conductors and an output conductor is connected electrically to the antenna conductors so that radio-frequency output is taken off the output conductor. The crossing locations of each of the antenna conductors are all located at points of the same potential on the respective heater conductors and the only direct electrical connection between the pair of antenna conductors is through the heater conductors. The output conductor can be connected to one of the heater conductors and therethrough to the antenna conductors. It can also be connected directly to one of the antenna conductors and indirectly via a nonresistive impedance to the other antenna conductor. This nonresistive impedance can be a capacitor or an inductor. It is also possible to connect both the antenna conductors via such a nonresistive impedance to the output conductor.

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Bochum, Germany

Paul Weigt