Thanks

Metal is special - it actually absorbs the radar pulse and re-transmits it back to the antenna. That is why you typically get such a strong response from metal (and usually ringing as well). The non-reversal of polarity (sorry for the double-negative!) is important for its own sake. I think new FRP bars might also be a higher dielectric than concrete, and so would be expected to give a non-reversal of polarity, but the response won't be as strong as metal. So the basic concept - higher dielectric gives non-reversal, lower dielectric gives reversal - holds. I just get a little picky at the use of the word "reflection" when it comes to metal (although the word otherwise pertains for all other materials). If the metal is very, very thin (as in wire mesh), then you won't necessarily get the strong response I've seen from rebar, but that is, presumably, a more advanced topic. Having just written these sentences, I guess I'm more comfortable with "response" than I am with "reflection"... :)

hey i am in need for GPR signle processing technique could you suggest me resourse where i can learn

Can this thing detect subsurface silica deposits and water veins?

hi professor, it's crazy how good and accurate is this video. I'm currently taking a Geophisics exam, with a big focus on application to monitor landslides, they explained us the GPR method very quickly to be able to do some measurement on the field. The problem is that they had to cut half of the program to be able to finish on time, so i had some gap in the theory of GPR. Thanks a lot for the perfect explanation

Hi! bravo great job!! How can i buy Leica DS2000 .i live in outh Europe.Thanks

Not interesting system GPR. Bed resolution, so many mistakes

Ужасный лектор, много неточностей. Ну например Длинные волны (по его мнению) с 12.5 МГц- это вообще короткие волны. Работа зондирования провдяться и ниже 1 МГц. Учи матчасть неуч. 800 МГц уже далеко не длинные волны, ну никак. Ты же только что давал тадлицу с частотмаи, где VHF и UHF- это короткие и ультракороткие волны....Вообще зачем нужна ваша инвалидная коляска по полю...есть много более эффективных способов... Применение карйне скромное: вот на этой глубине лежит что-то. Столько погрешностей и неопределенностей. много исключений и неточностей в измерениях. Система полный отстой!

Hi sir .... i am osman and i have some issue with this device please tell me how can i get accurate coordinates for mark the utility and how i save the exact location coordinates for autocade drawing if send any proposals to contractor

Sir what is the propagation in ids cthrue in asphalt and concrete road plese reply

Would this machine check if anything is buried underground? My grandparents always thought there was treasure buried underground.

Garcia Cynthia Brown Kenneth Harris Joseph

Hernandez Melissa Anderson Brian Lewis Joseph

The dielectric constant we mark is approximate value for the medium or the utility ?

How good is this GPR? Looking to buy something similar for work in Nothern California

What a huge help. I was assuming "low" meant low and "high meant high and had my values backwards. This helped me clean my processed image up a lot. Thank you !

Thanks for demonstrating & explaining. I want to make a magnetic locator detection target to put on the end of a long plumber's snake that I can run through some plastic landscaping drainage pipe so I can find both where it is clogged and, eventually, where the other end is buried. I'll be using a CST/berger Magna-Trak 200 magnetic locator, and I think I could follow the location of the locator target as my assistant feeds the plumber's snake into the plastic drainpipe. Which would give me a more definitive detection as the layer of dirt & rock over the drainpipe gets thicker: a strong magnet or a ferrous iron target?

Harris Jeffrey Hall Charles White Barbara

Brown Michelle Johnson Christopher Walker Scott

What IS thé max depht it Can detect

Lawrence Forest

خدا ک ، ی ، ر رو به خر میده کو ، ص هم به کولی این دستگاه هم به شما داده که اصلا نمی فهمین به چه درد می خوره

Thank you for this video. If I need to simulate this, how can I know the central frequency, source-receiver distance, time window, etc? I am a beginner in this area. Thank you

This video is so helpful for beginners. Thank you!!!

Jerde Terrace

Excellent class . Thank you very much.

Thank you for this video...

If there a cable that is scanned right next to a piece of rebar and the scanned pics up the rebate but not the PT . Who Is liable ?

Thanks for perfect and valuable instruction

Does it give information about the diameter of the rebar?

Hey Bigman, It's been 3 years pass I am still going learning new things, but als back some of your channel following your video. So please keep updating new things. Appreciated!

In your opinion, is this ds2000 more complete than a DSX?

is it possible to create a DIY version for a project?

Merhaba profesör, videolarınızdan çokşey öğrendim. Bir sorum olacak korumalı antenler, ormanlık alanlarda çalışırken gürültüye neden olurmu?

HOW DEEP does this devise reach?

what would you use this for??

Whats the height of the gs18 one a standard mounting? 1.3m?

What would be the easiest means to find the undergound limits of an old unmarked dump/landfill?

Hi Dan, We have been researching GPR for the last few weeks with a view to purchasing a vehicle mounted system. 88% of roads in Australia are unsealed dirt roads, most of the rest use ultra thin asphalt over approx 150mm to 300mm gravel then natural soils Additional information such as ground water table would be a possible advantage but less of a priority in our case. Air coupled antenna seem a safer option given the poor running surfaces we often encounter would destroy a ground coupled antenna. Do you have any recommendations on the best configurations of antenna ? I've read 2Ghz air coupled and 900 Mhz ground coupled is a good combination. Could we substitute the 900Mhz ground coupled for a air coupled antenna and mount it on the same arm.? Also is there a minimum distance the antennas should be located from a vehicle ?

What is that

Hello, are you acquainted with Radan 7 post processing software? i am trying to build a relation between gpr to density of soil by studying the velocity variation

Do you guys walk in alternate mode? Is only one way? I mean, seems to me that one one line is created and the plotted due the GPS data. How do you guys put the image in the google map? Do you use surfer and then export?

i just bought that book . thank you so much

The green pulse, how do we know if it is a void from the wave

thank you so mcuh for sharing! is that possible to read if there are any moisture different inside the concrete?

Nice work

Nice work

Sir my gpr shows odometer error

Love this. Even though it is raining you still go to the effort to do a video for us showing exactly what we need to see. Thanks Dan.

The video was very informative it has great insight into the operation of the unit. Your technician great. Maybe also have someone else hold the camera it was moving around too much. I really had a hard time seeing the screen.