Geophysics Forum

The RIM method is primarily used for low frequency (kHz to low MHz) crosshole imaging, primarily to detect voids in coal mines before additional mining. They also make an EM gradiometer for detecting shallow conductors. The EM gradiometer system has a passive tunable receiver and can use three diffe...

Stolar Global of Raton, NM, USA does this service and builds their own equipment.

I have used most of the brands on the market and my current system is the Impulse Radar PinPointR. It uses real time sampling (RTS), operates at both 400 and 800 MHz, and is very compact in size. The price is very competitive at around $16K plus the tablet controller. I am using the Samsung Galaxy T...

Why do you want to do airborne GPR on a river? I have done tons of geophysical surveys from walking to towing, to real helicopters and planes and also from unmanned aerial systems (UAS). In my opinion towed surveys are the sweet spot for value. Waterborne surveys are just another variation on towed ...

Since it appears that you have more time than money, the target is relatively shallow, and relatively large versus the depth I would suggest electrical resistivity tomography. The DUOYI DY4300B 4-Terminal Earth Ground Resistance and Soil Resistivity Meter costs just over $300 USD for a kit with a re...

Is there any interest in a complete system like this? What would a good price be for the complete system? Would it be better to break it up into components to sell?

Thanks for any feedback.

I have a GSSI SIR-4000 GPR controller along with several antennas and number of accessories that I want to sell. I would ideally be able to sell everything as a complete package, but if I can’t get a a reasonable price I might consider breaking some of it up into individual items. The SIR-4000 contr...

Since you seem to have acquired data from somewhere without a plan on what to do with it, I am going to assume that you don’t have a budget for processing and analysis software. If this assumption is incorrect, then please correct me. If this assumption is correct, then you might want to try Geopsy....

You are stuck in the middle of a large industrial change. CAD and GIS software were originally designed for very different problem sets with very different needs. These types of software are controlled by two 800 pound gorillas, ESRI and Autodesk, who are on a collision course. Both are converging o...

I’m glad you got your GPS working with your GPR. I’m sorry to hear that some manufacturers are still charging extra to use a capability that should be standard in 2019. I had some difficulties a few months ago when attempting to help some users get GPS working with a US Radar Quantum Imager. It was ...

What specific model of Mala GPR?

What type of processing and analysis do you need to do? Are you just looking at profiles, or do you need time slices? What brand and model of GPR are you using? Each manufacturer has their own software which usually comes with the purchase of the equipment. If your university has GPR equipment, I ha...

I don’t remember the details on that instrument but the founder of the company, Dr. Larry Stolarczyk, patented everything. So I would do a patent search under his name an you should find the details.

For commercial equipment I am aware of only one company working in this area. Stolar Global Imaging sells and also provides service for coal seam imaging. The system is a wound coil for low frequency radar imaging.

Stolar Global Imaging
http://stolarglobal.com/
Radar Imaging Method(RaiM)

I realize that this post was from many years ago, but I was bored while sitting at my desk and waiting for some data processing to complete. I was skimming through old posts and saw this one. There are two problems that occur when you are making geophysical surveys on grids with alternating line dir...

USA

Both antennas are still available, $3000 each or best offer.

I have two GSSI antennas for sale, a 400 MHz and a 270 MHz. Both are in pristine condition but have been replaced with a 350 Mhz Hyperstacking (HS) antenna.

The first step in answering this question is to define bistatic and monostatic. Monostatic means that one antenna element is functioning as both the transmitter (Tx) and the receiver (Rx). All monostatic systems have the antenna in a single housing, while some bistatic systems have both Tx and Rx in...

Most of my PhD research was on better ways to measure the electromagnetic properties of soils to improve detection of small compact targets. What frequency range are you interested in? What spatial scale are you interested in? What is your required accuracy? Do you have a fixed price that you are ta...

We have lots of methods for this specific problem. Some of them work well and some work really well. The issue is money, no one really wants to spend the money to solve the problem. I do this for a living and my group has been doing this since the early 1980s.

Did you solve this problem or are you still looking? If you are still looking, please send me an email at 99thpercentile@gmail.com.

I suggest making a Kirk shear wave source. If anyone wants it I have the PDF of the USGS Open File Report describing it. It can be modified so that you can do any polarization orientation of your source and then also your geophones, although the two most common orientations are parallel to survey li...

This is a difficult question in GPR as well. There was a conference paper by Richard Yelf titled, "Where is True Time Zero?" published in 2004. Many of the GPR manufacturers use different definitions, either the the first negative break or the peak of the first positive break.

Look into infrasound to see the seismic method most often used for comprehensive nuclear test ban treaty violations.