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Modulation transfer functionmatlab

Because a material’s thermal expansion behaviour generally changes with temperature, the temperature range over which the expansion measure was made is usually indicated, i.e. α (room temperature to 200°C).

Modulation transfer functionwiki

The MTF is a criterion that describes accurately the optical system performance of imaging systems. It represents the transfer of the contrast modulation from object to image as a function of the spatial frequency (Fig below).

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Mtf modulation transfer functionppt

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Modulation transfer functionRadiology

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Within advanced and specialty ceramics, magnesia and zirconia have some of the highest expansion coefficients, and fused silica has one of the lowest. Alumina being closely matched with titanium and nickel alloys make these materials particularly well suited for brazed assemblies.

Modulation transfer functionimage processing

In other words, it describes the system ability to resolve details and is given from measurement numerically (by percentage) on a chart (modulation versus frequency).

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The Coefficient of Thermal Expansion (α) indicates the fractional change of length of a material per a degree change in temperature while at a constant pressure. The value is specified as the change in unit length per degree of temperature.

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The thermal expansion coefficients of ceramics are generally lower than the coefficients of metallic alloys and unfilled polymers, although there is an overlap. When brazing to join a ceramic and metal alloy, this differential of expansion coefficient will cause strain within the braze interface between the two joined materials. Accordingly, careful selection of an appropriate braze alloy, for the joined materials and for the intended operating temperature range, is required.

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Mtf modulation transfer functionin optics

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Specially designated software provides a graphical presentation of the MTF results (%), see Fig below. In addition, the observer who sees the image target on the computer screen determines in which group (representing different frequencies) of the resolution target the black and white lines can be seen.

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Mtf modulation transfer functionradiology

In principle, a resolution target that represents the object is placed at the focus of a collimated beam impinging on the optical system that transfers its image to a sensor (Fig below), inputting the identified signals into a computer.

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