Abstract: A method for testing a tire by interferometry in a pressure chamber of a tire testing device includes capturing phase images at different pressures in the pressure chamber, generating partial phase difference images between successive phase images, and summing the partial phase difference images to form an overall phase difference image. The pressure in the pressure chamber is changed in a first direction during a first measurement phase and the pressure is changed in the opposite direction during a second measurement phase, wherein at least one partial phase difference image from the first measurement phase and at least one partial phase difference image from the second measurement phase are included in the summation.

Abstract: A method for testing a tire by interferometry in a pressure chamber of a tire testing device includes capturing phase images at different pressures in the pressure chamber, generating partial phase difference images between successive phase images, and summing the partial phase difference images to form an overall phase difference image. The pressure in the pressure chamber is changed in a first direction during a first measurement phase and the pressure is changed in the opposite direction during a second measurement phase, wherein at least one partial phase difference image from the first measurement phase and at least one partial phase difference image from the second measurement phase are included in the summation.

Abstract: A tire inspection apparatus for the optical inspection of a tire (4) comprises a housing with a support surface (3) for the tire (4) to be inspected; several measuring heads (7, 8, 9, 10; 12, 13, 14, 15, 16, 17), each of which comprises an optical measuring system, for inspecting the inside tread surface (11) and/or the external lateral surface (18) of the tire (4); and a positioning device (21, 22, 23, 24) for moving some or all of the measuring heads (7-10; 12-17) into a rest position and into a measuring position. To improve a tire inspection apparatus of this type, the measuring heads (7-10; 12-17) and the support surface (3) are installed without freedom of rotation.

Abstract: A tire inspection apparatus for the optical inspection of a tire (4) comprises a housing with a support surface (3) for the tire (4) to be inspected; several measuring heads (7, 8, 9, 10; 12, 13, 14, 15, 16, 17), each of which comprises an optical measuring system, for inspecting the inside tread surface (11) and/or the external lateral surface (18) of the tire (4); and a positioning device (21, 22, 23, 24) for moving some or all of the measuring heads (7-10; 12-17) into a rest position and into a measuring position. To improve a tire inspection apparatus of this type, the measuring heads (7-10; 12-17) and the support surface (3) are installed without freedom of rotation.

Abstract: The present invention relates to an inspection apparatus for tires having a positioning device for the tire to be inspected and a laser inspection device. In accordance with the invention, the inspection device comprises several measuring heads, in particular laser measuring heads in order to reduce the inspection time. In accordance with one aspect of the invention, several observation units and associated lighting sources are integrated in each measuring head.

Abstract: A method serves the direct phase-angle measurement of radiation, in particular of light radiation which is reflected from a body. The body is exposed to coherent radiation. The radiation reflected from the body is imaged by an imaging optical system (6) in an image plane in which a sensor is located. A reference radiation generated in accordance with the shearing method is superimposed on the sensor. The phase of the radiation from the body is determined from the measurement signals of the sensor. To improve such a method, the imaging optical system (6) possesses a diaphragm (11) having one or two apertures (12, 13) (FIG. 2a).