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2 people online in the last 1 minutes - 0 members, 0 anon and 2 guests. (Most ever was 44 at 17:01:08 Tue Nov 20 2012) |
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overtheedge Offline 708 posts Reply |
Thanks everyone.
I'm trying to use the sonar equations and an easy way to determine rough pressure wave propogation velocities by accepting greater errors than geophysicists would. I didn't intend to start a sh** storm or drag people into trying to figure out D/T curves. I have Slotnick's, Meissner's and Rockwell's articles from the 50's and 60's on hand. Lots of folks have a problem with the math and the science behind thier work. Uh, guess that includes me too. I'll pursue this problem on my own. I do have several PICs and a couple of programmers on hand as well as PIC Basic programming. Reckon I will have to spend more time studying on sampling rate and A/D conversion with the PICs. Neither my Brush or HP chart recorders are fast enough. I figure thier error rate will be about ±4mS in material with the same propagation velocity as water and 5000 ft range (based upon chart speed of 125mm/Sec). Have you priced chart paper for these old rigs? At distances less than 5000 ft and any hope of resolution goes away. And here I am looking at max distances of <50 ft. Oh well, I got them for radio astronomy anyway. So back to full circle and the PIC 16F series. Mayhaps it is my desire to simplify and accept errors in ranging trying to over-rule the science that is creating the problem. Sometimes (okay fairly often) that approach fails. Perhaps the earlier thread on fish finders needs further field testing. I see that HumminBird has a line called Fishin'Buddy. Just not enough time, money and not enough of me to get'r'done. Again my thanks and anytime you are thinking inside the box, you just might find you are in a mental institution. New ideas win out not by force of argument, but rather by outliving the detractors. |
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kringle_mining Offline 2563 posts  Reply |
No reflection is for the shallow profile. Refraction is for deeper profiles.
Reflection uses the rebound of compresional waves Refraction incorporates the use of shear waves Over needs to know the speed/velocity of the placer bedrock being measured. And a velocity of waves through unconsolidated overburden dry Through unconsolidated overburden wet and a velocity for unconsolidated "permafrost overburden. These velocities will be needed to convert his time profile into a depth measurement to located the first interface. Vortex moose also communicate the same way by tremors, low bleeting sounds and keen sense of smell |
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Seden Offline 222 posts Reply |
OTE,
While all this is being sorted out, I bought a nice Geophone from B.G. Micro here:http://www.bgmicro.com/index.asp?PageAction=VIEWPROD&ProdID=10783 Then download one of these freeware P.C. O'Scopes that are triggered by sound here:http://www.dxzone.com/catalog/Software/Oscilloscope/ Doesn't anyone use RISC 8051's? Randy |
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overtheedge Offline 708 posts Reply |
By RISC 8051, do you mean the 8051Basic that has a basic interpreter built in?
I haven't only because of the price. I do like using basic language for programming; mostly because I'm far better at it than assembly, C, Pascal, etc. The PICs are just soooo cheap and have a wide assortment of capabilities for the money. Then when you figure the forums and books written for the PICs, it is awful hard to consider other MCUs. Been a couple of years since I spent much time at the bench and I know I'll have to upgrade my reference library. I do like the books from Square One. Now if I would just get away from parallel ports and move into this century and USB. BTW, don't overlook the projects from Nuts and Volts magazine and the stuff from Scott Edwards such as the Basic Stamp series of MCUs. As I recall, my PIC Basic compiler came from Scott Edwards or maybe it was microEngineering Labs. One programmer O/H is from MicroChip and my other one is from Andomeda. I picked up my geophones from BG Micro too as I recall. They were part of a kit that included a cheapo bar graph board to measure voltage from the geophones. Thanks for the link on the PC scope software. --------------------------- I contend that the broader a person's skill set and tools to match decreases the probability of an empty stomach in a struggling economy. Of course, I've been wrong before. |
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growler Offline 51 posts Reply |
Would a SmartSeis SE that was rented be a solution? jimmy
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growler Offline 51 posts Reply |
Thanks Geo. I had not seen a rental that affordable. Very cool. Jimmy
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overtheedge Offline 708 posts Reply |
Geo
Count me among those interested in PICs, applications for geophysics and the software. Checked out the programmer I got from MicroChip a few tears ago and it is a PICLite. Not sure if it will program the newer fare from MicroChip. Might have to upgrade. Winter coming on so have to get a plan of action together to keep from going nuts. Usually I have found that my best bet is educating myself. Gotta send off an order to Square-1 Electronics and upgrade my library on PICs and the stepper motor/CNC books look interesting. Thanks for getting me re-interested in PICs. I grew up in an analog world (RF communications) and digital is quite different. Not so much more difficult, but rather a different mindset: on-off, timing and conditionals rather than biasing, feedback and amplification factors. Oh well, I figure if you aren't learning why are you hanging around stealing air? From another of your postings on another thread, I totally agree, teach others what you have learned. I tend to think the old saying about re-inventing the wheel has a counterpart; don't re-invent failure. Share the failures too. Again, my thanks. |
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overtheedge Offline 708 posts Reply |
Figured I'd share a resource from a different angle that includes a bunch of info; okay its parallel port I/O stuff. Granted parallel port is old technology, but it is still quite usable and the theory/application info is good stuff.
Parallel Port Manuals #1 & #2 hxxp://www.phanderson.com/ I got my copies while he was still at Morgan State University. These were the student driven projects with schematics and source code. The rumors that DOS is dead isn't exactly true. It still exists in older versions of Windows® such as 95 - ME. It is stable and pretty small, ie no bloatware. Not sure if it is in Windows 2000®. In newer versions, it is just a compatibility window that may or may not work for your applications. Another resource is hxxp:www.sq-1.com This is the place for a bunch of books on PICs. They are written in a tutorial type format with the schematics and source code. Don't overlook the stuff on the MicroChip site. Check out the forums and application notes. Hope this helps. Just trying to pay folks back and forward for all the info I find interesting and informative that you all have posted. |
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