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- Select DAQ > Measurement Editor from the IMS panel menu. This window allows the user to view and adjust the XMSL Data Acquisition (DAQ) parameters (Figure 2).
- Interval: Number of centimeters the core will move between each image. This value is hardcoded in IMS software and cannot be changed in this window. This interval guarantees image overlap and maximizes system efficiency. Default interval is set at 12 cm.
- Width: Fixed length of the produced image. This value is dependent on the detector and hardware setup. Default length is 15 cm.
- Stack: Number of x-radiographs taken at each position. These images are stacked and averaged to produce the final raw image. 20 images is the standard. Stacking more images does not improve the image quality further. See the User Guide, 'Image Stacking' section for more explanation.
- Exposure Time: Duration of each exposure in milliseconds.
- kV: X-ray tube voltage. Maximum voltage for the source is 120 kV. Lowering the voltage while maintaining the number of x-rays penetrating the core (longer exposure or higher current) will increase image contrast.
- mA: X-ray tube current. Maximum current for the source is 1 mA. Increasing the current will increase contrast if voltage is kept constant.
Figure 2.- XMSL Measurement Editor Window.
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Figure 3.- Correct core position.
2. Click START. The Section Information screen is displayed (Figure 4).
Figure 4.- XMSL Section Information Screen.
3. Select the Core Status (left side of window) that matches the type of core being imaged.
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Figure 5.- Warning message indicating that the source is not ready to ramp up.
NOTE: If this message pops-up and both doors are closed, call the Physical Properties technitian.
6. Click MEASURE
7. The motion control pusher will move
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the section
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under the source.
8. When section is over the detector, the x-ray source will ramp up and a window with
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its status will appear (Figure 6
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)
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.
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Once
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mA and kV are stable, the window will close and image acquisition will begin.
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User may abort at any time by clicking the
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ABORT button.
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Figure 6.- X-Ray status. As the source ramps up, the measured values will update.
9. System will move the core and
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automatically take images along the section (Figure 7) until the actuator reaches its limit switch
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and returns to the home position
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. At that moment the source will ramp down.
Figure 7.
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- IMS display during imaging.
10. XMSL Section Information window will reappear on the screen (Figure 8).
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Figure 8.- Sample Information Window- Pusher End Sequence View.
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11. Open the load door and place the XMSL
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whole-round or section-half Pusher section onto the track.
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Close the load
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door.
12. Select Pusher end sequence in the Sample ID window. The source will ramp back up and the motion control system will continue to push the section through the x-ray system.
- X-Rays OFF
- Figure 9 will be displayed when the X-ray Off command is sent to the CP120 source. The window will be displayed until the kV has been confirmed to be at zero.
- You will also see this window flash on during X-Ray START when the CP120 fails to respond to the start command. The X-ray off will reset communications with the CP120 and bring it to a known state which will clear any communication issue.
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