Space image range finder
The spatial image rangefinder is an optical device for measuring distances that was mainly used in the military sector. It uses the stereoscopic effect and therefore places higher demands on the spatial vision of the operator and on their training than coincidence rangefinders that only have one eyepiece .
With the spatial image rangefinder, which has two telescopes along a baseline , the targeted object is observed with both eyes. The images from the right and left telescope differ slightly and measurement marks are displayed in these images. There is a fixed scale and moving mark construction principle:
- With a fixed scale , the marks for the right and left telescope have different stereoscopic parallaxes that appear at different distances in the image. The image gives the impression that these brands represent a series that leads into depth. The distance to the targeted target can be read from the mark, which gives the observer the same distance as the target object.
- If the mark moves, only a single mark is displayed in both beam paths, but it can be moved in the direction of the depth in the image. The mark is moved next to the observation object and the distance can be determined based on the mark movement in the optics of the rangefinder.
Carl Pulfrich , head of the department for optical measuring instruments at Carl Zeiss , designed the first practicable spatial distance meter based on a patent from Hector Alexander de Grousilliers in 1899. Spatial image rangefinders were primarily used for air defense, because the disadvantage of the more complex operation was compensated for by the ability to be able to follow fast moving objects well against a background without contrast.
See also
Individual evidence
- ↑ NN: range finder, range finder, telemeter. In: Lexicon of Optics. Spektrum Akademischer Verlag, 1999, accessed on August 27, 2019 .
- ^ Josef Maria Eder: Detailed handbook of photography . 4th edition. Knapp, Halle 1932, p. 562 ( online in Google Book Search).
- ↑ Patent GB189317048 : Improved Stereoscopic Telemeter. Registered September 11, 1893 , published July 14, 1894 , inventor: Hector Alexander de Grousilliers.