Profile projectors - viewing and measuring small objectsThe Profile projector has an illuminated table on which the object is placed and a screen on which the magnification is displayed. The maximum workpiece height that can be placed on the object table is 90 mm. The measuring table has a size of 340 x 152 mm or 196 x 96 mm if the glass measuring table is used instead of the steel cross table. The screen of the projector has a diameter of 300 mm, so that the magnified objects can be displayed very clearly and in detail. The profile projectors allow both transmitted light illumination and reflected light illumination. This results in two different working techniques. With incident light illumination, the object is illuminated from above. It therefore appears brightly illuminated on the monitor. Transmitted light illumination, on the other hand, takes place from below. The object thus creates a shadow image and the outer area along the profile is bright. The combination of both lighting techniques allows outline shapes and surface texture to be clearly displayed and compared.
Enlargements true to scale allow precise measurementsThe special feature of the profile projector is the true-to-scale magnification. This means that the object is not only clearly visible in its profile, but precise measurements can also be made on the monitor. The profile projectors have an accuracy of +/- 0.08 percent for magnifications. In addition, an integrated data processor belongs to the projector, which helps with the measurement work. This processor enables a variety of measurements directly on the projector. For example, two points can be marked on the monitor and the distance between them can be measured. Likewise, the distance between two objects can be measured. It is also possible to make three-point measurements. In this way, the radius or centre of a circle can be determined. The data processor also measures angles, whereby both lines and points can be used for calculations. The measured data is shown on a display next to the monitor. This is also where the control unit is located, which is used to enter the various functions.
Digitizing and transmitting dataIn today's world, it is important for measuring tools to integrate seamlessly into the digital network. This saves time and opens up new possibilities for how the data is used. For this purpose, the profile projectors have a data output with the rs232c interface. Via this data output, the measured values can be transmitted in digital form for further use.
Interchangeable lenses extend the functionsA major advantage of the profile projectors are the interchangeable lenses. As standard, the projectors are equipped with a lens with tenfold magnification. This lens provides a 30 mm diameter field of view on the monitor. Other lenses are available as accessories. The 20x magnification lens provides a 15 mm diameter field of view. For particularly small objects with a fine profile, the lenses with 50x or even 100x magnification are suitable. These magnify a field of view of six or three mm on the stage.
The measuring stage can be moved along the x and y axes. This means that even a larger object can be viewed in all its details at different points. Other accessories available for the profile projectors include blue filters, various measuring rods, prism holders and aids for calibrating the system. A compact thermal printer is also available for some models. This allows the measurement data to be output directly at the workstation without the need for a detour via a computer system.