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Figure 4. Section Information window. Add Image.
B. Instrument Calibration
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- Ensure the values in the window are set as shown in Figure 14.
- The instrument X-offset is measured from the home switch to the center pixel of the detector (Figure 15).
- This value must be updated should the detector position change or if the home switch on the track is modified.
- Click ACCEPT to save the changes and write them to the configuration file. Click Cancel to revert to previous values.
Figure 14. XMSL Parameters Window.
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Figure 21. Dialog when after user selects abort during imaging. The x-ray source will automatically ramp down once abort is selected. The section in the imager will need to be restarted from the beginning once abort is selected.
G. IMS Utilities
a) XMSL: Image Utility
The image utility can be found under Instruments > XMSL: Image Utility (Figure 22). This utility is useful for determining the proper voltage, current, and integration (exposure) time for imaging cores. User can also review the processed images in this utility.
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Figure 22. General Image Utility User Interface Window. This utility is used test exposure settings before imaging a section. The histogram (upper left) will be displayed when the ROI box tool is used and the line profile (lower left) is displayed when the ROI line tool is used.
b) Automatic Image Processing - XMSL: Image Process Utility
Image Processing Utility has the following purpose:
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- The axis of the source’s x-ray beam must centered on the detector and perpendicular to its surface.
- The pixel to centimeter scaling factor must be determined. As of X379 this value was determined to be 109.6px/cm when measured at the half-core height. A grid standard is available for use to repeat the measurement
- In IMS, you must set the instrument offset to the center row of pixels of the detector.
c) XSCAN Automatic Image Processing
This utility was designed to be used on the XSCAN. During X396T in was implemented on the XMSL with the purpose of testing it in subsequent expeditions.
The utility allows the user to have greater control over the process that is being applied to the images.
d) Manual Image Processing
The IODP processing algorithm is available in a Linux and PC version and can easily be placed on any work station. This program allows the user to adjust the contrast and change settings related to instrument setup and geometry. The processing software files must be placed in a directory above the location of the images to ensure file navigation will work.
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2. No images appear after selecting Process Images: The bit size or pixel length are not set correctly. Check the command window for error messages and check the settings in the processing settings window.
III. Transferring Images to Data 1
A. Data Upload Procedure
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e) XMSL: View Last Images Utility
View Last Images utility can be found under Instruments > XMSL: View Last Images (Figure 45B). This utility is useful review the characteristics of the selected images.
Figure 45B. View Last Images utilily
III. Transferring Images to Data 1
A. Data Upload Procedure
Images are transferred to Data 1 via a script on the XMSL host PC. The script copies the output from the XMSL to data1 automatically and is executed via a task scheduler every 30 minutes.
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Click Accept to save the values or Cancel to return to previous values.
Figure 55. XMSL Motor and Track Options Setup Window
Figure 56. Motion Utility Window
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Note, these values along with the detector position set in the Camera: General Setup under instruments must be accurate for proper motion control. Take care in setting these values.
Figure 57. XMSL Fixed Positions Window
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- This panel is used to define the orientation of the track system, limit switches, and the home switch (Figure 58). The MDrive can be used with either a dedicated Home switch or a limit switch as a home switch. In the case of the XMSL track we use a home switch.
- Select Axis: In the case of the XMSL it is always X.
- Select Track and Home Geometry: For the XMSL, select CW look @ CCW Edge
- Click the Motion Utility button to test the settings.
- Click Accept to save the settings. Click Cancel to return to previous values.
Figure 58. XMSL Limit and Home Switches Window
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Click Accept to save the settings. Click Cancel to return to previous values.
Figure 59. Motion Profiles Window
The following table shows the motion profile settings for the SHMSL X and Y axes controlled by the interface.
Axis→ | X-Axis | ||
|---|---|---|---|
Profile↓ | Speed | Accel. | Decel. |
DAQ Move | 5.0 | 20.0 | 30.0 |
Limit Seek | 5.0 | 1.0 | 80.0 |
Home Final | 3.0 | 2.0 | 80.0 |
Load/Unload | 5.0 | 5.0 | 10.0 |
Push-Slow | 5.0 | 5.0 | 100.0 |
Push-Fast | 5.0 | 5.0 | 50.0 |
User Defined | 5.0 | 5.0 | 5.0 |
Table: Motion Profile by Axis for WRMSL/STMSL
C.1 Hardware
The IODP x-ray system is composed of a 120 kV, 1 mA constant potential x-ray source and a detector unit. The source is a Teledyne ICM CP120B portable x-ray generator with a 0.8 by 0.5 mm focal spot. The beam angle is 50 by 50 degrees generating a directional cone onto the detector, which is distanced 65 cm from the source. The detector is a Go-Scan 1510 HR unit composed of an array of CMOS sensors with an active area of 102 by 153 mm and a resolution of 99 microns.
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