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Borehole radar


RPL0T soft 『cattle used to generate high-quality radar images. CROSSHOLE Woolf projection software uses one or more holes to explain the reflection data. 5. TOM0MA, TOMOCG and TOMO-PLOT tomography x-ray photographic method for the processing software. TOMOMAIN software used to generate a continuous input tomography x-ray photography method data file conversion process, including the routine he is asked and the range of run-time data and drill coordinates relative to end Taiwan. TOMOCG chromatography software is the main X-ray photography method procedure for the conjugate gradient method to run to completion on time or amplitude data tomography x-ray photographic method of conversion. TOMOPL0T software used to draw tomography x-ray photographic method of images. Fifth, the basic principles of radar measurement method is the use of electromagnetic pulse propagation time to determine the distance to the reflective objects. He must meet two conditions: 1. Pulse must be short. In order to provide accurate measurement results; 2. Conductor must be able to maintain constant pulse propagation without excessive attenuation. These two conditions can be met in the rocks, but sometimes encounter severe restrictions. Only the longer wavelength pulse propagation distance in the rock. So weigh the various factors, in geological conductors generally take a wavelength of 0.1 - 10m. Rhyme detection ability of borehole radar is to detect the ability of irregular objects. It depends on the physical properties of objects and their surroundings significant difference between the physical properties. In addition,[link widoczny dla zalogowanych], the size of the object also plays an important role. According to general experience. If an object in one direction extends the length equal to half the wavelength of the radar cross the length of time, then the object can be detected. Conductive body in the geological radar wave propagation due to claims by the following effects: a 9-one (1) dielectric constant e (2) permeability (3) electrical conductivity (4) According to angular frequency dielectric constant,[link widoczny dla zalogowanych], conductivity and angular frequency to calculate the Q value (Q a e) to determine whether the conductor to maintain the geological radar in spring sowing,[link widoczny dla zalogowanych], if Q>> 1,[link widoczny dla zalogowanych], the radar can be used to measure the transition; if Q <I, then the skills of any radar cross spread. Frequency of certain conditions, the radar measurement of core samples to predict the dielectric constant and conductivity of the rock radar wave propagation in this situation. Dielectric constant of most minerals, 5-7, and thus slightly higher than the speed of radar speed of light in vacuum to 1 / 3 in many geological environments, water is the only significantly different dielectric material, which measure the radar changes in velocity to that contained in the pores and pore water. Determined by the attenuation of both radar and conductivity depends on the dielectric constant. Water than most non-conductive minerals have a high electrical conductivity but + conductive minerals and salts in the rocks there are some cracks in the rock, the radar wave attenuation is usually relatively large. The salt content, metallic minerals and clay minerals can also cause ± significant attenuation borehole radar radar for different types of rock have different detection ranges. Figure 4 is based on different measurements of rock core samples of different rocks to the maximum possible detection range of investigation range (m) Frequency (MHz) Figure 4 At present, this borehole radar technology has aroused great interest in the industry of large construction projects such as underground railway tunnel geological conditions around the probe, high-rise buildings are foundations of deep geological conditions such as detection and large-scale open pit mining and quarry exploration geology, etc. The radar detection technology can be applied. It can be said is very practical borehole radar survey of engineering technology. Main
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