ImageJMTF

The modulation tranfer function is an objective criteria for the imaging quality of optics.OEG GmbH provides a comprehensive product line for the computer-controlled fully automatic measurement of the modulation transfer function (MTF) for quality assurance in the optics manufacturing. Depending on specimen parameter, there are different setups available.

The MTF describes how the image contrast varies with spatial frequencies. It is expressed as the ratio of contrast in the image to contrast in the object as a function of spatial frequency of a line grid with cosinus functional transmission. Spatial frequency is expressed in terms of line-pairs per millimeter (lp/mm). The MTF combines image resolution and contrast into a common representation.

Modulation transfer function

The modulation transfer function (MTF) is a recognized control criterion for the optical imaging quality. It characterizes the resolution of optical systems on the axis and in the image field. Beside the MTF a lot of other parameters can be measured, e.g. the focal length, chromatic aberrations, distortion, astigmatism, field curvature, depth of field.

The test chart image is seized with highest accuracy and evaluated by an image processing system using the according mathematical algorithms.

In the fully automatic measuring mode, measuring templates are processed automatically. Measuring templates can be generated freely by the operator.

MTF

Another feature of an MTF measuring instrument is, that it allows system testing in situations similar to actual applications. Field angle positions, spectral ranges, distances between object- and image plane can be replicated or simulated in the test of an optical system.

LensMTF

Despite the presence of sophisticated design and manufacturing techniques, lenses can still vary considerably in imaging quality because of manufacturing errors. Because of the growing demands in imaging performance of lenses their characterisation by help of the Modulation Transfer Function (MTF) as the premier parameter for objectively evaluating is more and more used.

The OEG-MTF-benches are working satisfactorily with many german and international considerable optics manufacturers in the production control. In addition it is also outstanding suitable for the employment in teachings, research, laboratory as well as goods in and outgoing inspection.

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MTF testingMastercard

The optical industry uses this parameter as meaningful quality function for the objective evaluation of optical systems.

The MTF benches of OEG provide fully automatic characterization of imaging quality on- and off-axis for any azimuth and type of object/image conjugates by measurement of the modulation transfer function (MTF).

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The fourier transformation of of the line spread function results to the complex optical transfer function. The MTF is the magnitude of the fourier transformation of the line spread function.

The MTF measurement is based on the evaluation of the test chart image, provided by the lens under test. As test chart an edge or a gap (haircross) is used.