DD263670A3 - DEVICE FOR PRODUCING LIGHT INTERFACES - Google Patents

Abstract

Device for producing light sections with a measuring camera and a Lichtschnittgeraet, which are set on a measuring line in a space whose contours are determined and whose surface is to be measured, at a distance from each other. By a directed light beam and use of reflected light, the production of the absolutely necessary parallelism of the image plane to the light section plane takes place. The mirror reflecting the light is provided with a black matted cross, which divides the mirror surface into four parts and whose center is exactly above the measuring line. The two plates of the Lichtschnittgeraetes are of different sizes, the surface of the rear plate is larger on all sides than the front. Fig. 1

Description

Mirror surface according to the invention by a black-matte cross whose center is located exactly above the measuring line or to the same extent as the light source is offset to her, is divided into four sub-areas. The light-section device possesses; a rear plate, which is arranged at a small distance parallel to the front and whose surface is larger on all sides than that of the front plate. As is known, a light source, preferably a flashlight device, whose light aperture is directed into the gap between the plates, is attached to the light-section device on the rear plate.

With this device, an outwardly accurate exactly produced parallelism between their parts is achieved quickly and safely and made a highly visible and effective to be used comparison surface.

embodiment

The invention will be explained in more detail below by way of example. In the accompanying drawing mean:

Fig. 1: View of the device at a site; *

Fig. 2: View of the Lichtschnittferät from the direction of the measuring camera.

In a route of underground mining, in which route profile measuring buoys are to be executed by applying the light-section method, a measuring line 2 is placed in the longitudinal axis of the route by means of two fixed points 1. On the measuring line 2, a measuring camera 4 mounted on a stand 3 and at a distance of 3 m from this position a light-section device are arranged. The light-section apparatus consists of a front plate 5 having an area of 300 × 500 mm and a rear plate 6 connected to the front plate 5 so as to leave a uniform gap of 4 mm between them, and a flash unit 7 whose light exit surface is in the gap between the plates 5; 6 is directed. By means of a suspension 8, the light section device is detected on the measuring line 2. At the measuring camera 4 facing surface of the front plate 5 of the light-section device plane-parallel to this, a mirror 9 is fixed, the mirror surface of 100 x 150mm of a black ma oriented cross 10 with 30mm beam thickness is divided into four parts. The center of the black-matte cross 10 is located just above the measuring line 2. At the farthest from the center of the black-matte cross 10 corner of each face, at exactly the same distance from the center, a photocell 14 is attached. All four together represent the receiving device and are set to respond to a uniform level of light. Opposite the front plate 5, the rear plate 6 has a larger area, which projects on all sides 5mm over the surface of the front plate 5 also. On the measuring camera 4 ere light source 11 is fixed, whose directional light beam perpendicular to the image plane 12 of the measuring camera 4 and parallel to the measuring line 2 is emitted. After determining the measuring line 2 in the longitudinal axis of the distance to be measured, the device is used by the measuring camera 4 and the light-section device are arranged on the measuring line 2. The light source 11 and the center of the black-matte cross 10 are located just above the measuring line 2. The directional light beam emitted by the light source 11 is directed in the direction of the measuring line 2. The light-section device assumes a position in which, from the view of the measuring camera 4, all four partial surfaces on the mirror 9 are illuminated from the center by reflected light of the light beam impinging on the center of the black-frosted cross 10, without any flashback through the reflector directly reflected light beam can enter. Image plane 12 and light section plane 13 extend in a position perpendicular to the measuring line 2 and exactly parallel to each other when allo four faces are illuminated uniformly. The set amount is exceeded at the same time on all four photocells 14, and thereby they are activated. In this situation, the measuring camera 4 is opened and the flash unit 7 is operated in the gap between the two plates 5; 6 produces a lens which simultaneously illuminates the contours of the track to be measured in this plane and the surface portions of the rear plate 6 projecting beyond the surface of the front plate 5 in the same plane. The illuminated areas are recorded by the recording camera 4 prepared for taking photographs and are available for a subsequent evaluation.

Claims (2)

Apparatus for producing light sections with a measuring camera and a light intersecting device, consisting of two plates mounted in close proximity to each other in parallel and comprising a flashlight device whose light exit surface is directed into the gap between the two plates, as well as devices which connect both parts of the device in the Distance from each other in a space to be measured, especially in mining underground, fix on a measuring line, further with a light source, which is attached to ugr measuring camera and whose light beam is directed exactly over or pa ^r allel offset to the measuring line, and with a mirror , which, mounted plane-parallel to the light-section device, divided into four partial surfaces and equipped with a receiving device, characterized in that the mirror (9) a black-matte cross ('P) is mounted, whose center is located exactly above the measuring line (2 / to which Betrar is parallel to her, the a It also has the light beam of the light source (11), and that the area of the back plate (6) is greater on all sides than the area of the front plate (5). For this 2 pages drawings Field of application of the invention The device is for the manufacture of light cuts in Berghau underground, but also for Innenprof ilmessung in larger containers, pipelines and channels under conditions determined in which by means of light section cross-sections of cavities are to be measured. Characteristic of the known state of the art It is according to llschner, Neue Bergbautechnik, 14th year (1), known that along a measuring line a measuring camera and a light-section device be so 'set up that the light disc generated by the light-slit illuminates the contour of the space to be measured at this point and the camera can photograph them. The light-section device consists of two equal-sized plates. Between these, which have a small distance from each other, there is a flash unit. The light exiting from the narrow gap between the plates when it is actuated draws the contours of the space and at the same time strikes reflector rods arranged on the outside. Thus, a fitting point system is recorded as a reference surface for image evaluation. The light-slit device has no aids for orientation to the measuring camera. As a result, the parallelism of the light-section plane to the image plane of the measuring camera, which is an indispensable prerequisite for an accurate measurement, must be established by measuring with geodetic devices from location to location before each profile measurement. The necessary attaching and removing the attachable reflector rods and the production of parallelism find time and laboraufwendign measures, especially if the measurement must be in narrowly limited and differently designed spaces vonstatten. It is also according to DD-WP 140081, the use of a light source and a mirror for testing the parallel position of two surfaces and according to DD-WP 136070, the decomposition of the mirror surface in four sub-areas, in each of which a photocell is known. The use of such devices in unilluminated rooms at the time of measurement using a light beam directed at a mirror can not preclude flashback, which significantly compromises the safety and accuracy of producing the required parallelism of the planes. Object of the invention The aim of the invention is a device that ensures the production of parallelism of image plane and light section plane safely and at high speed in narrowly limited, low mining cavities or technical structures such as containers, channels and passable pipes and produces a constantly consistent and well-lit comparison area. Explanation of the essence of the invention The object of the invention is to limit to a device for producing light sections a constantly fixed Vergleichflächn by glowing lines and to achieve the production of the Parallelst the image plane and the Lichtschnittbüne by optical means in such a way that flashbacks are prevented by an inserted mirror , The device consists of a measuring camera and a light-slit device, both of which are placed on a fixed by two measuring points measuring line at a distance from each other. On the measuring camera, a light source fjst is attached, whose light beam along the measuring line or parallel offset it. At a front Pia.Ό of the light-section device, a mirror with a Ernpfangsvorrichtung is fixed to the measuring camera facing surface plane-parallel to this, the