If you want to discover new things, you either need to look in new places or try new methodologies.

Our scanner works with a unique combination of physics, mathematics and technical innovation.

Dr Colin Stove, the founder and inspiration behind the Adrok ADR Scanner, had a distinguished career in the field of radar – working with radar sensors from both satellites and the Space Shuttle, as well as working extensively with ground penetrating radar.

This fundamental understanding of wave and light physics gave him the insight and knowledge he needed to successfully reinvent the subsurface scanner using an advanced ‘coherent’ beam (two waves working together), that has worked so effectively, it is fundamentally changing the way the exploration industry works.

Why Atomic Dielectric Resonance?

The first three letters of our name A. D. R. stand for ‘Atomic Dielectric Resonance’. And this phrase is the key to how the scanner works. This is what we create and what we interpret. We measure ‘dielectric resonance’, which is the unique way materials resonate when hit by electromagnetic waves.

How does the scanner do what other scanners can’t?

The Adrok scanner transmits and then receives back, narrow pulsed beams of micro and radio waves. When these waves cross a boundary between material types, an ‘echo’ is reflected back to the scanner.

But the ‘echo’ that is received is different to the one that was sent out. It has a slightly different resonance. Why? Because a material has its own Dielectric Permittivity – or ‘resistance’ to the electromagnetic wave that we hit it with - think of it like pouring water on a variety of household objects - all will absorb and repel the water in a different and unique way depending on what it is made of.

This ‘echo’ is as unique as a fingerprint, and can then be analyzed to reveal detailed information on the characteristics of the material that has been discovered.

Because the micro and radio waves are both absorbed and reflected by materials, we can also obtain accurate measurements of the shape and depth of the materials scanned (effectively a map).

Predrilling Virtual Logging ®.

Its Less Boring with Adrok ®.

Sustainably Extending Resources Life™

Download our ADR Technical White Paper for more information

Turning doubters into believers...

Some frequently asked questions about our technologies?

Q: Do we emit a narrow beam as a laser?

A: No, as our deeply penetrating centre frequency has a wavelength of about 30metres the narrowest possible beam would be about 10 times wider than the wavelength because of Huygens' principle. However we do use beam modelling (a form of raytracing) in our analysis and some forward models.

Q: With a wavelength of 30m don't we have an error of 30m in feature localization?

A: This is true if we used a single photon. If N photons are used the theoretical error is 30m/sqrt(N). Classically we use phase information to accurately locate a reflector. In practice accuracy is limited by sampling rate, and not the theoretical limit as N is of course very large.

Q: Doesn't Maxwell's equation predict radio waves don't penetrate?

A: Maxwell's equations govern electromagnetic phenomena in vacuum only. To model propagation in materials such as the earth a specific model of the electrical properties of the earth has to be created and then coupled to the Maxwell equations. Such models are phenomenological and usually have several parameters that are difficult to measure in-situ. Download our technical note on the propagation and attenuation of EM waves in complex media for further technical explanations. Also here is a research project that demonstrates our signals' two-way reflection propagation through 1.1km of rock to ground level from inside one of Europe's deepest underground mines.

Q: Can't we just measure the electromagnetic properties of rocks in the lab and then use that in a forward model for subsurface propagation?

A: When material is removed from the ground atmospheric contamination (mainly moisture) changes the electrical properties, so these values are not the in-situ values governing propagation. Apparently Erwin Schrödinger, one of the founders of Quantum Mechanics, measured such changes for his thesis and found the resistivity can change by many orders of magnitude. As a consequence the attenuation of the EM waves in the ground as predicted by ground model parameters obtained in the lab from rock samples often displays strong attenuation, whereas field measurements show wave propagation with much less attenuation. We have performed in-situ measurements of attenuation at selected locations and found that when in-situ experimental data is used the attenuation is several orders of magnitude less than predicted by “book” values. Details can be found in SEG2014 conference paper (Doel et al, 2014) and CSIT2018 peer-reviewed journal paper (Doel & Stove, 2018).

Q: Why do some geophysicists say that this technology does not work?

A: Cognitive biases and uncertainty (incomplete understanding) may be at play. Have you asked them whether they have tested or used our technology before? The likelihood is that they have not bothered; which clearly does not mean that our technology does not work or will not be successful. There are many geophysicists with vested interests in the geoscience industries who become nervous about competition and do not like new ideas or new technology generated by others, as it may adversely affect their own positions and reputations.

As Sir Arthur Charles Clarke stated - Every revolutionary idea — in science, politics, art, or whatever — seems to evoke three stages of reaction. They may be summed up by the phrases:

(1) "It's completely impossible — don't waste my time";

(2) "It's possible, but it's not worth doing";

(3) "I said it was a good idea all along."

Opportunities are found where the speed of scientific and technological innovations outpace the rate of Humans' adaptability to change.

Learn more about Adrok's deep penetrating ADR Technology

Download a Glossary of Terms




Atomic Dielectric Resonance

Correlation Method

Stacks a large number of traces from a series of stare scans and applies mathematical filtering to give a baseline over which the signal can be described as being of high quality. The signal returns are analyzed to show distinct changes in lithology for the area under investigation

Dielectric Constant (DC)

The index of the rate of transmission of our ADR wave packet through a medium relative to the transmission rate of the beam through vacuum. This is also sometimes called the transmissivity index, or relative permittivity. The vacuum has a dielectric constant of 1. For a medium such as limestone the dielectric constant (er) is typically 9

E-Log (Energy log)

During a stationary scan (“Stare” scan) the ADR transmitter and receiver antennas are positioned at known grid co-ordinates and aimed downward. The energy log (“E-log”) indicator is produced by dividing the Stare scan image data in time windows. Windowing is carried out in equal time intervals or the time axis is migrated to depth after our WARR tracking of dielectric and windowing is performed equal spatial intervals. The data windows are subsequently analyzed and/or enhanced utilizing a suite of signal and image processing techniques such as Fourier analysis, wavelet decomposition, and image enhancement algorithms using RADAMATIC, Adrok’s proprietary data analysis software. Amongst other indicators, this analysis produces the E-Logs which represent estimated energy values as a function of depth and were found to be excellent indicators. In this paper they are plotted on a logarithmic scale


Profile Scan of the subsurface with fixed focus Antenna spacings at ground level. Both Transmitting and Receiving Antennas are moved simultaneously in parallel along the length of the scan line. This produces an image of the subsurface (from ground level) based on the two-way travel time of Adrok ADR Scanner’s beams from Transmitter (Tx) to Receiver (Rx) Antenna. The WARR data converts the P-Scan time-stamps into depths in metres.


A stationary scan where data collected with both antennae pointing the ground


“Wide Angle Reflection and Refraction” scan to triangulate subsurface depths from the surface ground level. The transmitting antenna is moved at ground level along the scan line, away from the stationary receiving antenna which is positioned at the start of the scan line. Collected by ADR Scanner at ground level (produces depth calculations)

Weighted Mean Frequency

The frequency and energy values are combined to produce a Weighted Mean Frequency for each measured depth interval. WMF is the energy weighted mean of the frequencies. Therefore, frequency values with a high weight contribute more to the WMF than frequency values with a low weight