Automatic Determination of Optimal Computed Tomography Settings

With automatic determination of the optimal settings, the operation of coordinate measuring machines (CMM) with computed tomography (CT) has become simplified. . With WinWerth TomoAssist, any user can achieve good reproducibility with short measurement times, regardless of experience level.

The new WinWerth TomoAssist software module from Werth Messtechnik, Germany, makes the companies TomoScope and TomoCheck CT machines even easier to use. TomoAssist automatically determines the optimal CT setup parameters for a particular measurement task. Suggestions are made for the tube power, voltage, hardware filters, exposure time, and number of projections. The new process takes into account the component properties such as geometry, orientation, and material as well as the structural resolution required, based on the critical inspection dimensions.

Optimization of precision for a given measurement time (top): The automatic setting algorithm of WinWerth TomoAssist guarantees better precision (green) than the operator (red) for the same measurement time. Optimization of the measurement time with specified precision (bottom): The automatic setting algorithm in WinWerth TomoAssist guarantees a shorter measurement time (green) than the operator (red) with the specified precision. Although the operator accepts a longer measurement time TomoAssist achieves better precision.

When the precision of the measurement values is specified, for example given by the workpiece manufacturing tolerances, the parameters are automatically set to minimize the measurement time minimizing inspection costs.  An estimate of the measurement time is also provided. If the measurement time is specified, as is often the case when defined by the manufacturing cycle time, the precision is automatically optimized and the expected value provided. Complicated and expensive test measurements can be avoided using this technique putting the CT machine to more efficient use. Any user can determine the optimal tomography parameters in just a few steps without needing expert knowledge.

Experienced users can also use WinWerth TomoAssist to adjust individual parameters specifically when boundary conditions change; the tube power level can be maximized for a given structural resolution. Optimizing the voltage and pre-filter ensures high contrast and low noise making it possible to either increase reproducibility or reduce measurement time. By optimizing the exposure time and the number of rotary steps, the measurement time is reduced to the minimum necessary.

WinWerth TomoAssist covers a wide variety of applications, from first article inspection to the creation and optimization of measurement sequences.

Optimization of precision for a given measurement time (top): The automatic setting algorithm of WinWerth® TomoAssist guarantees better precision (green) than the human being (red) for the same measurement time. Optimization of the measurement time with specified precision (bottom): The automatic setting algorithm in WinWerth® TomoAssist guarantees a shorter measurement time (green) than the human being (red) with the specified precision. Although the operator accepts a longer measurement time to be on the safe side, TomoAssist achieves better precision.

For more information: www.werth.de

 

HOME PAGE LINK