Registered in England and Wales company # 03449181.
© Copyright: Conwy Valley Systems Limited 2000-2016.
Conwy Valley Systems Limited,
Wells House, 12, Hawes Drive,
Deganwy, Conwy, LL31 9BW, United Kingdom.
VAT# GB 741 5190 48
A Geoscience Wales founding member.
The Prior Scientific (formerly Swift) electro-mechanical microscope slide stepper has been one of the most reliable pieces of equipment in use in the oil industry. In its 40 years of production, over one thousand have been sold but there are no known cases of a replacement having been ordered, so production has been on a steady decline. Coupled to a drop in demand for petrographic analysis, limiting the number of new entrants to the market, it was perhaps not surprising that no-one noticed that production depended on one man, an ex-employee of James Swift, who manufactured them at home, on machine tools from the former Swift factory.
Unfortunately, he died recently and his widow apparently didn’t appreciate the importance of his work and of the tools cluttering up the place. Last year, it became apparent that orders could not be fulfilled and that the market did not warrant resumption of manufacture, as that now entailed re-establishing a manufacturing process.
Whilst this was inconvenient for those wanting to set up a new petrographic workstation, it was catastrophic for Conwy Valley Systems limited (CVS), a small company dedicated to reversing the decline in demand for petrographic analysis by enabling petrographers to bring it up to date in the digital data age and make it relevant to petrophysicists and engineers. CVS therefore set about making a replacement stepper, taking the opportunity to effect significant improvements on a 40-year-old design.
The new stepper has been built by Bangor University’s electronic engineering group (IDB). It comprises two precision miniature linear actuators fixed together to form an X-Y position controller. Each actuator is based on an 8mm diameter stepper motor driving a lead screw whose carriage runs on a linear slide. Precision and repeatability is assured without employing feedback sensors. The current version is coupled to its controller via a cable, but a cordless, remote-controlled unit is being developed. Position is under software control from a PC mouse and can be programmatically determined as either absolute or relative position.
Oil-IT magazine 2002, reproduced with the permission of the author
For further reading : Swift Polarising Microscope
|Academic and Research|
|Papers Referencing PETROG|
|Who Uses Petrog ?|
|Upgrade from PetrogLite|
|Custom Work Flow and Protocols|
|Data Capture & Analysis|
|Data : Storage & Exchange|
|Area of Interest|
|Set Area of Interest|
|Compositional Analysis Methodology|
|Qualifiers and Relationships|
|Microporosity and XRD|
|SteppingStage Manual Control|
|Compositional Data Entry|
|Textural Data Capture|
|Quantitative Composition Data Entry|
|Textural and Compositional Data Entry|
|Composition Data Capture|
|Colour Space Analysis|
|Grain Size Annotation|
|Data Editing and Review|
|Point counting Application|
|Compositional Data Entry Image|
|Quantitative Composition Summary|
|Concentric Pie Chart|
|Grain Size Analysis|
|Where is Petrog ?|
|Replacing a point counter|
|10 years of the SteppingStage|
|PETROG 4 Installation|
|The Imaging Source Installation|
|Zeiss (Axiocam) Installation|
|Zeiss (ICc) Installation|
|Installation With No Camera|
|PETROG 3 Upgrade|
|PETROG 3 Installation|
|PetrogLite 3 Upgrade|
|PetrogLite 3 Installation|
|Windows 7 Installation|
|Control Box Chip Upgrade (2009)|
|USB - Serial connection|
|Nikon Small World 2013|