General description

The O^2DS sensor is an optical measuring device for non-contact precision measurement in two dimensions. The measurement is performed by oscillating the triangulation plane over 10° (max. 50°). A fine collimated or focused laser beam is diffusely reflected from the surface of almost any kind of material or fluid, and a CCD- camera records the image through an objective. This makes it possible for a Digital Signal Processor to calculate the (radial) distance from the centre of the mirror axis to the object surface, as well as keeping track of the angular reference position.

The O^2DS measuring system is a compact unit where optics, CCD-camera, and digital signal processing electronics all are integrated in the sensor housing. The schematic drawing to the right shows the O^2DS 130 scanner seen from the side. It is here indicated how the triangulation plane, with this orientation of the scanner, can sweep (maximum) from minus 25° below the horizontal X-plane up to plus 25° above the horizontal X-plane. The distance data is available with a measuring frequency of 2 kHz as a digital signal, and presently for Windows applications only.

The scanner is delivered with diskettes containing a Windows test/demo program as well as the DLL file. The PC program receives output data from the scanner over the RS232 or RS422/485 interface and a COM port, and presents the measured distance to the object with the aid of DLL software support that comes with the scanner. The software either converts polar coordinates of a measurement point to orthogonal X, Y-coordinates or presents a profile (table of X, Y-values) for each sweep from one side to the other. The user can within the application program specify the seize of the Y-increment and thus the length of the output table containing the profile data.

The O^2DS scanner is developed for the need of 2D- / profile-measurement in any kind of industrial application. The ruggedly constructed scanner is designed to give a very reliable measuring performance with good measuring accuracy. With output data in the software-converted form, the Y-coordinates can be used for width/hight measurement with a resolution dependent of the user chosen scan arch. By combining the X-coordinates of the profile data from two scanners, width data can be computed and presented in connection with the edge profiles measured from both sides of the object.