One option available to cutting machine builders is to use a more capable cutting head with a motorised zoom collimator and variable beam expander, which enables the focal spot size
to be modified.
This system is to offer at least 240kV capability, with a 5 m focal spot size
, supplied with its own enclosure and have the additional capability of scanning and capturing data on long objects in an automated fashion.
Schematic indicating the effect on the focus of an x-ray tube as the focal spot size
Spatial resolution in CT is primarily determined by the pixel size of the detector, the ratio of the distance between the source and the object and the object and the detector (geometric magnification), and the X-ray focal spot size
(Goldman 2007; Romans 2011; Staude & Goebbels 2011).
Besides the physical dimension of the detector, the focal spot size
of the lens mechanism is another factor that can cause signal fall-off.
Measuring the acoustic impedance with a 230-MHz transducer would be time-consuming and have a more localized reading, however, because the focal spot size
of the transducer is so much smaller.
The different geometries have been compared in terms of the focal spot size
, the side lobe level, and the amplitude of the field at the focal point.
Laser fluence used is 3.18 J/cm2 where the focal spot size
on target surface is 100 um.
The detectable flaw size depends on the focal spot size
, detector resolution and magnification-not the software.
Knowing the focal spot size
and position during the critical start-up phase of a manufacturing process is critical to providing consistent and quality parts.
The phantom was imaged at 40 kV using the small focal spot size
. The images were scored on the 3 megapixel screen used for clinical evaluation.
The penetration depth in laser welding is proportional to the power density of the laser beam and is incident function between the focal spot size
and its power.