Section Half Imaging Logger: User Guide
Manual Information
Author(s): | M. Hastedt |
Reviewer(s): | Crawford, Fulton, Beck |
Supervisor Approval (Name, Title, Date): |
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Audience: | Scientists and Technical Staff |
Current Version: | Draft 11/01/08 LLP |
Revised: | Draft 1/7/ |
Domain: | Physics |
Analysis: | Section Half Imaging |
Contents
Topic | See page… |
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Introduction
The section half image logger (SHIL) takes digital images of the flat face of split cores using a line scan camera. Sediment cores are imaged as soon as possible after splitting and scraping to minimize color changes that occur through oxidation and drying. The SHIL can also be used to image the outside of a whole round hard rock section (see <<section>> for details).
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SHIL system operation involves a number of processes, some performed only once upon initial installation, some only when lighting or camera equipment is replaced, and some on a routine basis at the beginning of each expedition or at the beginning of each batch of samples. The following procedures are covered in this manual:
- Installing and calibrating light array (see Light Installation).
- Setting black and white saturation gain levels (see Maximum Dynamic Sensor Range).
- Setting color balance
Reviewers – additionally, when you see an "Author" query like this one, it's a prompt for you to provide additional information. Please make sure you answer all of these questions; this may require some research or enlisting someone else's help.Wiki Markup *\[Author: Where is this covered?\].* - Making camera corrections (see Routine Camera Adjustments).
- Setting track velocity (see Track Speed Example).
- Adjusting knee slope, if needed (see Procedure: Iterative Adjustment).
- Performing QA/QC to confirm camera settings (see Quality Assurance/Quality Control).
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- Camera
- 3CCD (charge-coupled device) line scan camera: JAI model CV107CL
- Macro lens: AF micro Nikkor 60 mm (1:2.8)
- Light system
- High-current line lights: Advanced Illumination model LL068
- Power supply: 24 V/6 A
- Current source: model CS420-0103 constant (modified)
- Linear encoder: Newall 2 µm/72 in. model SHG-TT
- Motor system
- Motors: Galil model BLM-N23-50-100
- PCI controller card: model DMC-1846
- Motor amplifier: model AMP-19520
- Breakout board: ICB-90044-M 44-pin
- Power supply: CPS 56V/12A
- Connectors for motor extension cords: AMP 4-pin connectors (172167-1 male, 172159-1 female)
- Robot modules: NSK 2-meter model XY-HRS200-F06246Do we use a gearbox for this logger?F06246
- PC Workstation
- NI frame grabber card model PCIe-1429
- NI camera link I/O extension board
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All rock pieces should be dry and individually rotated such that the split face is approximately perpendicular to the axis of the camera. The lights and lens aperture are configured to give consistent illumination and focus to effectively image rubble bins.
If the user wishes to image the outside surface of….Flesh out this placeholder to discuss the whole round imaging apparatus.
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Preparing the track system for imaging cores requires adjusting the position of the lights and barcode imager for optimal quality and calibrating the system by adjusting camera settings. The position of the lights and barcode imager, once set, should be stable throughout an expedition. The technical staff will calibrate the camera settings (SHIL: Camera Configuration AUG) and light array (SHIL: Light Array AUG) whenever the camera or light sources have been repositioned or changed.
Setting up the
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Lights
Initial light installation and fine adjustment procedures are described in the SHIL: Light Array AUG. For routine operation, follow these steps:
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The laboratory technician calibrates the system when needed by adjusting camera settings and analyzing an imaged Kodak Q13 grayscale standard.
Calibration adjustments are performed using an iterative process of imaging a ruler placed crosswise on the track then counting the pixels between millimeter marks, moving the camera up or down, and repeating. See
for details on this procedure.Wiki Markup *<LINK> \[Author: Where is this procedure documented?\]*
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- Ensure that the track gantry is clear of obstacles for the entire length of its linear actuators and that camera height is adjusted so that 20 pixels = 1 mm.
- After the section has been split and prepared either by scraping or scrubbing, place the section on the rails with the section top against the stop by the color standard tiles.
- Rotate the section/hard rock pieces along their lengths so that the split surface is approximately perpendicular to the axis of the camera lens.
- Click Scan on the computer screen and verify that the barcode information has decoded correctly.
- The 2D barcode includes the original length of the section. If the section is now longer due to expansion then enter the new length manually.
- If you are satisfied that all information is correct then hit GO.
- The section will be imaged. If the image is satisfactory, select the Ends of Material Points > Save, This section is no longer correct. and a virtual label with section identification will attach to the saved image while the concatenation endpoints are recorded to the LIMS.
- Otherwise, press Discard, correct any problems, and scan the image again.
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Sample and Analysis
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Components
Analysis Code | Component | Description |
IMAGES | adapter_mag |
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| adapter_tube |
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| comment |
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| compound_field_of_view |
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| contrasting_method |
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| dimension_horizontal |
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| dimension_vertical |
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| file_create_date |
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| filename |
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| filesize |
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| filters |
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| illumination_type |
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| light_source |
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| objective |
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| objective_field_of_view |
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| objective_mag |
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| ppi |
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| total_magnification |
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| tube_field_of_view |
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Uploading Data
After section is imaged, select the Ends of Material Points > Save, and Redo this sectiona a virtual label with section identification will attach to the saved image while the concatenation endpoints are recorded to the LIMS.
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Common problems encountered when using the core imager and their possible causes and solutions:
Issue | Possible Causes | Solution |
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Actuator squeal | NA | Lightly tap the actuator housing to silence the noise |
Image too dark | Manual F-stop on the camera closed down | Have technician adjust F-stop aperture |
| Exposure time is too low | Increase exposure time |
| Focused lights are not aimed at the correct spot | Adjust lights |
Track is "stuck" | Run was aborted with the software abort switch | Reset software and run sample again |
| Run was aborted with the hardware abort switch | Reset hardware and run sample again |
| Gantry flag has tripped the end-of-travel limit switch | Adjust gantry flag and run sample again |
| Current limit on motors was exceeded | Check the Galil AMP-19520 for LED error indicators. Call track technician or ET to reset the motor controller |
| Torque limit on motors was exceeded. <we need to check how Labview handles this!> |
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Image indicates that camera was triggered erratically OR no image acquired | Camera was left in Free Run mode in MAX | Set camera to Externally Triggered for normal operation |
| Linear encoder head has failed | Call an ET to verify/repair |
| Lens cap is on | Remove cap and repeat image capture procedure. |
Scheduled Maintenance
Frequency | Task |
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Daily | Ensure that the color standards, ruler, and barcode imager lens are free from dust, smudges, and crumbs. |
Weekly | Using a mirror, ensure that there are no fingerprints or smudges on the camera lens. Call the imaging specialist if the lens needs cleaning. Do not attempt to clean it yourself! |
Monthly | Check socket head cap screws in the camera and lights mounting plates for looseness. |
Every Expedition |
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Annually |
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Standard Replacement Parts/Spares
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www.digikey.com is a good source for small quantities of AMP hardware
Related Documentation/
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Links
The following documents contain more detailed information on the logger system components:
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