Laser scan micrometer for die swell measurement
Intended use
High-precision continuous, non-contact die swell measurement
High-precision continuous, non-contact die swell measurement
The Brabender® Swelltest provides high-precision, non-contact measurement of the diameter of objects with a circular cross-section and any transparency by means of a visible parallel laser beam with continuous diameter measurement on round profiles.
The Brabender® Swelltest provides:
The measuring system is attached to the Swelltest die head by means of an adaptation kit. The distance to the die head can be adjusted between 12 and 50 mm. A red laser beam emitted from the laser diode in the transmitter is converged into a parallel beam by the transmitter lens. This parallel beam passes through the measuring area before it meets a CCD image sensor in the receiver.
During processing, the extrudate runs through the measuring sector. When the laser beam meets the extrudate, its cross-section is interrupted. This interruption projects a shadow with an area proportional to the diameter of the extrudate on the receiver. The one-dimensional CCD image sensor scans and calculates the shadow area from which
the sample dimensions are calculated by the controller.
Apart from die swell measurement, the Swelltest offers a number of other applications:
| Measuring window | 30 * 300 mm |
| Measuring range | 0.5...10 mm (option: 30 mm) |
| Measuring resolution | 5 μm |
| Accuracy | ± 0.03 mm |
| Sampling rate | 780 c/s |
| Display resolution | 5 μm |
| Serial port | RS 232C, baud rate 300...9,600 b/s adjustable (option) |
| Analog voltage output | 6 V |
| Light source | visible semiconductor laser beam, wavelength 670 nm |
| Ambient temp. at sensor | 0...40 °C |
| Power supply | 85...264 VAC, 47...63 Hz |
| Enclosure rating | IP 60 |
