Optics: measuring and testing – Range or remote distance finding – Triangulation ranging with photodetection – but with no...
Patent
1995-09-06
1998-02-24
Hellner, Mark
Optics: measuring and testing
Range or remote distance finding
Triangulation ranging with photodetection, but with no...
356375, 348357, 348374, G01C 300, G01B 1114, G03B 1300
Patent
active
057216118
DESCRIPTION:
BRIEF SUMMARY
The invention relates to a photogrammetric camera, in particular for photogrammetric measurements of technical objects using a focussable objective and at least one high resolution sensor movable across an optical axis, and a distance measurement device.
BACKGROUND OF THE INVENTION
Photogrammetric cameras of this kind are known for photogrammetric measurements of terrestrial objects from the ground or from the air. Generally, light-sensitive film on a photochemical base is used as the photographic receiver. The typical film format amounts to 23*23 cm or 13*18 cm and the resolution a maximum of 50 lines/mm for black and white aerial survey films.
To be able to measure objects which lie far apart with consideration of the resolution power, several overlapping exposures must be made which are assembled into a complete picture with the aid of control points. Before the final image is available for measurement and analysis, the exposed film must be developed, rectified if necessary, and the partial images must be assembled at the control points.
For the measurement of technical objects, i.e., for processing information through tooling machines, this expenditure and the time span between the exposure and the possibility of evaluating the pictures is uneconomical and unsatisfactory.
When optoelectric sensors, the image information of which is stored in memory, are used as a photographic receiver instead of a photochemical film, the time expenditure for the development of the film material drops away, but an immense storage capacity is required for this to store the image information, which in turn requires a significant processing time for computer processing the image information as a result. In this way, the optoelectric substitution of the known photochemical photographic receiver does not offer an economic alternative either.
For achieving technical objects, it is a matter of the image information lying in sections of the complete picture, while the image information lying in the remaining sections is extraneous.
A photogrammetric camera which includes a focussable objective and a sensor is known from EP 0 505 037 A2. A distance measuring arrangement makes the measurement of the distance between the objective and the sensor possible. The sensor is designed as a horizontal CCD line and is arranged on a platform which is movable across the optical axis of the objective in the vertical direction so that a two-dimensional image can be scanned by moving the CCD line.
Furthermore, an optoelectric camera in which the image is broken into partial images by lenses is known from DE 35 37 220 A1. An image projected from a first objective to a focal plane is reproduced by further lenses on a 1:1 scale on the surfaces of the CCD surface sensors. In this way, standard small surface sensors can be used for obtaining a large image.
Finally, a position indicator for determining the position of a sampling device relative to a surface that can be positioned is known from DE 39 09 855 C2. For this, marks at a constant interval which are arranged in two coordinate directions on a positionable surface are evaluated by means of samplers, from which all three coordinate directions of a Cartesian coordinate system can be determined.
SUMMARY OF THE INVENTION
The invention provides a photogrammetric camera including a focussable primary lens system having a focal plane, a high resolution sensor unit which is movable across an optical axis of the primary lens system, and a distance measuring unit including at least one high resolution distance measurement device which detects the distance between at least one projection center of the secondary lens system and a reference point of the at least one high resolution sensor, and the distance between the projection center and the optical axis of the primary lens system. The high resolution sensor unit includes a secondary lens system which reproduces at least one enlarged section of the focal plane of the primary lens system on at least one high resolution sensor allocated to the second
REFERENCES:
patent: 5196400 (1993-03-01), Petterson
patent: 5404226 (1995-04-01), Kellner
patent: 5435785 (1995-07-01), Lenhardt et al.
patent: 5453839 (1995-09-01), Samuelsson
E.M.S. Technik GmbH
Hellner Mark
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