Optical geometry measurement system for reinforcing steels
The rib measuring devices are used for automated geometric measurement in quality assurance and factory testing of steel for the reinforcement of concrete or weldable reinforcing steel with two, three, four or six rows of ribs. Gewi, Bamboo, profiled and intended surface or glass-reinforced plastic (GRP), glass-fiber reinforced plastic (GFRP) can be measured. The relative rib area (fR) or relative indentation area (fP) will be detemined after the measurement is carried out according to German DIN 488, EN ISO 15630, BS 4449 and most international standards.
For the measurement, the samples must have a length between 200 mm and 500 mm. The test bar is clamped horizontally or vertically in a three-jaw chuck and, depending on the measured variable, illuminated with high-contrast or transmitted light. The test object is optically captured from different angles through a rotation unit by two to three high-resolution CMOS black and white cameras and displayed in a window on the computer monitor
A computer and an image processing unit digitize the respective image. The measuring principle is based on the search of black and white transitions, where the object boundaries are determined by means of a gradient method from the gray levels.
The instrument is calibrated by two certified calibration rods of different diameters. Calibration is automatic and can be repeated at any time.
- The rib measuring system determines the following measurements:
- Rod cross-section and nominal diameter
- Rib height at the mid and at the quarter + three-quarters point
- Rib or indentation spacing (c)
- Head width (b) and foot width of the ribs
- Transverse rib flank inclination (α) - Angle of transverse rib inclination (β)
- Distance between rows of ribs (e)
- Relative rib area (fR) or relative indentation area (fP) in several Norms
- Height and width of longitudinal ribs
- Ovality
- Radius at the foot of the GEWI ribs
Data sheet for Rib measuring system
User manual
Gallery
