Manual Information
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Author(s):
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M. Hastedt
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Reviewer(s):
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Crawford, Fulton, Beck
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Supervisor Approval (Name, Title, Date):
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Audience:
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Scientists and Technical Staff
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Current Version:
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V383P | Draft 11/01/08 LLP
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Revised:
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Draft 6/17/2019
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Domain:
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Physics
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Analysis:
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Section Half Imaging
Contents
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Maintenance
Instrument Preparation
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 Lights (Section for old lighting system, delete when new lighting system is approved)
Initial light installation and fine adjustment procedures are described in the SHIL: Light Array AUG. For routine operation, follow these steps:
- Rotate the lights to the desired rough angle to the camera (usually ~30° to the camera axis for sediment cores). Fine-tune the light position by observing the camera output using MAX.
- Manually turn on one line light at a time to full power by pressing the "+" button on the light controller until you reach 100%.
- Loosen the brackets on both sides of the light mounts and make small position adjustments until the brightest image is achieved.
- Turn off the light by pressing the "–" button and press Select to enable the other light.
- Repeat Steps 2–4 for the second light.
Calibration
The laboratory technician calibrates the system when needed by adjusting camera settings and analyzing an imaged MacBeth QP 101 V4 Color Standard. These lights obtain The current light system obtains nearly uniform illumination intensity from the core’s surface (half or whole round) to the bottom of the liner by a combination of high intensity, overlapping large diameter light source, close coupling to the imaged surface and the “line” image plane. The bottom edge of the brass led mount should be set between 2 and 4-cm from the image surface. For uneven hard rock cores the height can be set higher but illumination intensity will drop, exposure times lengthen, f-stop opened and scanning speed reduced. Note, any height change to the lights requires re-calibration. Heat is removed from the leds LEDSs and transferred to the surrounding air via the copper heat pipes. While these to get hot they are not a burn hazard. However they are very delicate and bend at the slightest touch, so use care when working with the camera lens.
*Method based on Instructions sent by Bill Mills. BILL ! Please and SARAH please review, correct, and update!. Any questions are marked in red for clarification.
For more detailed information on the theory behind the calibration please refer to the Advanced SHIL Calibration page.
Safety Concerns
- These lights get hot and can damage or burn surfaces if left stationary and on for over 20-secs. This is not an issue during normal imaging operations and will not heat the core surface at all. BUT during calibration process when the lights are stationary you must use the manual power switch to turn the lights on and off. Do not use the plastic Gray card but use the cardboard instead.
- Never look at the leds directly! Even the reflected light can be painful! When working under the track make sure that the power is off.
- NOTE: if you are concerned with the heat dissipation, you can use our FLIR cameras to confirm that everything is ok.
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