ELCOLEVEL is a software with interfaces to electronic autocollimators and inclination levels of different manufactureres. This allows for example the 3D-Straightness measurement (twist-, roll- and yaw-angle) of slides in one and the same measuring procedure.

 

The windows software ELCOLEVEL serves for the measurement of straightness, squareness and parallelism of slides and the flatness of precision tables.

ELCOLEVEL has interfaces to electronic autocollimators and inclination levels of different manufactureres.

Measuring values of up to three measuring axes are simultaneously captured and evaluated, whereby all measuring axes can be freely combined with input devices like autocollimators or inclination levels.

The data aqusition is be made automatically and software controlled, also the manual data input is supported.

Due to the simultaneously measurement in three measuring axes (e.g. 2 autocollimation axis and 1 inclination level) it is possible, to measure the straightness of a slide in 3 axis in one and the same measuring process.

 

 

The autocollimator projects the image of a reticle pattern in collimated beam path to infinity. A mirror in the optical path reflects the beam back into the autocollimator.

The reflected beam generates the autocollimation image.

When the mirror is perpendicular to the optical axis, the beam is reflected into itself.

When the mirror is tilted with an angle alpha, the incident angle of the beam on the mirror is epsilon = alpha . After reflection the beam enters the objective obliquely with an angle of  delta = 2*Epsilon. Depending on the angle of the ray bundle to the optical axis, the autocollimation image is shifted from the centre.

The shift of the autocollimation image from the centre in both x0 and y0 directions is a measure for the tilt of the mirror.

Autocollimators that are calibrated to tilting angle show half the angle of the reflected beam to the optical axis on their reading and therefore directly the tilting angle  of the mirror.

 

The straightness measurement is the plase dependent measurement of the tilting angle of the reference mirror.

The reference mirror is set on slide. The autocollimator is adjusted to the mirror to zero position in x and y.

For the measurement, the slide with the reference mirror is moved in defined steps.

Each tilting of the mirror in the guiding direction effects a displacement of the autocollimation image from the zero-position. The displacement in each point is measurement.

ELCOWIN calculates from the displacement data the form of the slide.

 

 

 

For the measurement of planarity of surfaces several straightness measurements (s. p. 30) are carried out. The straightness measurements form a geometrical pattern, e.g. the so-called »Union Jack« pattern (fig. a). The autocollimator is put at one end of the line of measurement and adjusted such, that the light beam from the autocollimator is propagating in the direction of measurement.

 

A straightness measurement is carried out using the base mirror. A ruler can be used as a guide way for the base mirror. This procedure is repeated for the other lines of measurement.

 

The height profiles of the lines are combined to a two dimensional pattern, here the »Union Jack«, by linking at the intersection points (fig. b).

 

This evaluation is most easily carried out on a computer, using the special software ELCOLEVEL.

 

 

 

 

New interfaces for tilt angle measuring devices are always developed. Please call OEG or ask by mail, so we can inform you, which angle measuring devices are compatible with ELCOLEVEL. If your device is not compatible yet, the OEG software engineers also gladly develope a interface for your application.