Abstract: A measuring apparatus for measuring a modulation transfer function (MTF) of an afocal optical system has a receiving device, a light-providing device, a camera, at least one further light-providing device, at least one further camera, and a transmission interface. In an operational state, the light-providing device, the afocal optical system, and the camera are arranged coaxially on or with measurement axes parallel to a measuring axis oriented perpendicularly to the receiving plane. The further light-providing device, the afocal optical system, and the further camera are arranged coaxially on or with measurement axes parallel to an oblique measuring axis oriented obliquely to the measuring axis. An evaluation unit is configured to identify, using at least one camera image, the modulation transfer function of the afocal optical system.

Abstract: An MTF testing apparatus including a plurality of telescopic cameras each mounted at a fixed predetermined position on a camera holder, each camera receiving an image projected by at least one lens of a single device under test. A processor is coupled to the telescopic cameras. is the processor configured to receive image data from every telescopic camera and perform a plurality of MTF measurements, the telescopic cameras are mounted on the camera holder such that every telescopic camera captures image data resulting in an MTF measurement at a different field position of the lens. The camera holder comprises a holding structure and at least two brackets elongated elements projecting between first and second end portions, the end portions being releasably mounted on the holding structure, and at least two cameras are mounted on every bracket and the brackets are individually detachable from the holding structure.

Abstract: A device for measuring imaging properties of an optical system including: a rigid holding device; and MTF measuring devices arranged at predefined positions of the holding device such that, by each of the MTF measuring devices, a modulation transfer function can be measured at respective different, predefinable, angular positions in the image field of the optical system; wherein the holding device includes at least a first holder and a second holder; the MTF measuring devices include a first group and a second group; the first holder holds the first group at first positions so that the first group are arranged on a first spherical shell; the second holder holds the second group at second positions so that the second group are arranged on a second spherical shell; and the first spherical shell and the second spherical shell have different radii and are arranged so as to be mutually concentric.

Abstract: The invention relates to an apparatus (2) for detecting imaging quality of an optical system (4) with at least one lens (6) or lens group. The apparatus (2) includes an MTF measuring apparatus (10) for measuring a modulation transfer function at a plurality of field points in the field of view of the optical system (4), and a centering measuring apparatus (18) for measuring a centered state of the optical system (4).

Abstract: An MTF testing apparatus including a plurality of telescopic cameras each mounted at a fixed predetermined position on a camera holder, each camera receiving an image projected by at least one lens of a single device under test. A processor is coupled to the telescopic cameras. is the processor configured to receive image data from every telescopic camera and perform a plurality of MTF measurements, the telescopic cameras are mounted on the camera holder such that every telescopic camera captures image data resulting in an MTF measurement at a different field position of the lens. The camera holder comprises a holding structure and at least two brackets elongated elements projecting between first and second end portions, the end portions being releasably mounted on the holding structure, and at least two cameras are mounted on every bracket and the brackets are individually detachable from the holding structure.

Abstract: The invention relates to an apparatus (2) for detecting imaging quality of an optical system (4) with at least one lens (6) or lens group. The apparatus (2) includes an MTF measuring apparatus (10) for measuring a modulation transfer function at a plurality of field points in the field of view of the optical system (4), and a centering measuring apparatus (18) for measuring a centered state of the optical system (4). Furthermore, the invention relates to a method for detecting imaging quality of an optical system (4) having such a apparatus (2).

Abstract: A device for measuring the MTF or another imaging property of an optical system has a light pattern generating unit that generates a light pattern in a focal plane of the optical system. A reference axis of the device is oriented along an optical axis of the optical system. The device further comprises an arrangement of N, N=2, 3, 4, . . . , cameras that are separated from one another. Each camera has an objective and a light sensor that is arranged in a focal plane of the objective. The cameras are arranged on a side opposite the light pattern generating unit such that the light sensor of each camera detects an image of exactly one section of the light pattern. At least one beam deflecting element is arranged between the optical system and at least one of the cameras such that it deflects light away from the reference axis before the light impinges on the at least one camera.

Abstract: The invention relates to a system for determining the position of a test object comprising the following features: an autocollimation telescope having a beam source for emitting a beam; a beam splitter; a detector unit and an objective lens; and an optical element embodied as a focusing device, wherein the test object, the beam source and the focusing device are arranged along a common optical axis (z), and a control device for controlling the focusing device, which is designed in such a way that the beam can be focused onto a center of curvature of a first test surface of the test object with the coordinates (x1, y1) and at least onto a center of curvature of a second test surface of the test object with coordinates (x2, y2).

Abstract: An apparatus (10) and method for adjusting and/or calibrating a multi-camera module (2) having a plurality of cameras (4a, 4b). The apparatus (10) includes an optical arrangement for creating first virtual test structures (22) at an infinite distance and second test structures (26, 32) at a finite distance. Individual images (20a, 20b) captured with the cameras (4a, 4b) of the multi-camera module (2) include respectively the first and the second test structure (22, 26, 32). Based on the deviation of the position of the test structures (22, 26, 32) in the two individual images (20a, 20b), the cameras (4a, 4b) of the multi-camera module (2) are aligned relative to each other.

Abstract: An apparatus for measuring a wavelength-dependent optical characteristic of an optical system has a light-pattern generation device which generates a pattern of polychromatic light in an object plane. Together with the optical system, a measuring optical unit images the object plane on a spatially resolving light sensor. A dispersive optical element is arranged in a light path between the optical system and the light sensor in such a way that a plurality of images of the pattern with different wavelengths are generated simultaneously on the light sensor. The evaluation device determines the wavelength-dependent characteristic of the optical system from the plurality of images on the light sensor.

Abstract: In a method for measuring the positions of centers of curvature of optical surfaces of a single- or multi-lens optical system, an imaging lens system images an object plane into a first and a second image plane. The first image plane is produced by a first ancillary lens system having a first focal length and defining a first beam path, while the second image plane is produced by a second ancillary lens system having a second focal length that is different from the first focal length and defining a second beam path that is different from the first beam path. An object arranged in the object plane is then imaged simultaneously or sequentially at the first and the second image plane by means of measuring light. Reflections of the measuring light at optical surfaces of the optical system are detected by means of a spatially resolving light sensor. The actual positions of the first and the second center of curvature are calculated from the detected reflexes.

Abstract: A method for measuring the positions of centers of curvature of optical surfaces of a single- or multi-lens optical system, an imaging lens system simultaneously images an object plane into a first and a second image plane. The optical system is arranged so that a supposed position of a first center of curvature is situated in the first image plane of the imaging lens system and a supposed position of a second center of curvature is situated in the second image plane of the imaging lens system. An object arranged in the object plane is then imaged simultaneously or sequentially at the first and the second image plane by means of measuring light. Reflections of the measuring light at optical surfaces of the optical system are detected by means of a spatially resolving light sensor. The actual positions of the first and the second center of curvature are calculated from the detected reflexes.

Abstract: A method measures the positions of centers of curvature of optical surfaces of a multi-lens optical system. The spacings between the surfaces are measured along a reference axis using an interferometer. Subsequently the centers of curvature of the surfaces are measured using an optical angle-measuring device. In the course of the measurement of the position of the center of curvature of a surface situated within the optical system, the measured positions of the centers of curvature of the surfaces situated between this surface and the angle-measuring device and the previously measured spacings between the surfaces are taken into consideration computationally. In this way, a particularly high accuracy of measurement is achieved, because desired spacings do not have to be fallen back upon.

Abstract: A method for measuring spacings between optical surfaces of a multi-lens optical system includes detecting the centring state of the optical system by taking into consideration all optical surfaces of the optical system. Then the optical system is adjusted in such a way, taking the centring state into consideration, that the optical axis of the optical system is aligned as far as possible with a reference axis. In a next step the spacings between the optical surfaces are determined with the aid of a short-coherence interferometer. The measuring-light ray directed onto the optical system for this purpose runs likewise along the reference axis.

Abstract: A method measures the positions of centres of curvature of optical surfaces of a multi-lens optical system. The spacings between the surfaces are measured along a reference axis using an interferometer. Subsequently the centres of curvature of the surfaces are measured using an optical angle-measuring device. In the course of the measurement of the position of the centre of curvature of a surface situated within the optical system, the measured positions of the centres of curvature of the surfaces situated between this surface and the angle-measuring device and the previously measured spacings between the surfaces are taken into consideration computationally. In this way, a particularly high accuracy of measurement is achieved, because desired spacings do not have to be fallen back upon.