The introduction to the article includes a general interpretation of infrared display system. Thermal display of buildings will be analyzed in a comparative-qualitative approach. Chapter II presents a detalied interpretation of the formulas applied at thermal research. chapter Ill quotes the kinds of errors performed at remote temperature measurements by means of single-band or double-band infrared devices. The sources of uncertainty of remote temperature measurements, elementary applications and evaluation of thermovision in building industry have been included in the final part of this.

A geo-radar method is used for detection of underground installations with the use of electromagnetic waves. Results of investigations of installations depend on physical properties of soil media, which properties result in suppression, reflection and refraction of electromagnetic waves. Three parameters, electric permittivity E, magnetic permittivity μ and the medium conductivity a play the major role in establishing electric features of a material medium. Suppression of the electromagnetic wave has the basic influence on detection of underground installations with the use of the geo-radar, and, in particular, on the depth range of the method. Relation between designing parameters of the geo-radar equipment and its depth range is determined by the basic equation of the geo-radar method. Solution of the basic equation of the geo-radar method for the needs of detection of underground installations requires performing experimental measurements. Measurements of the maximum depth of detection of underground installations with the use of the geo-radar have been performed in media of known physical properties, i.e. in the air, water and water solutions of NaCl of various concentrations. Two steel pipes of diameters of</!= 0.03 m and O. l Om were the objects for testing. Measurements were performed with the use of antennae of frequencies of !OOO MHz and 200 MHz. The results obtained in the form of echograms were analysed in order to determine the maximum distances for which the tested pipes were recorded. Experiments allowed to state that the maximum measurements of the depth range of the geo-radar equipment is rapidly decreased with the decrease of the background's specific resistance below 50 Qm. An increase of the soil resistance above 500 Q m results in slight increase of the depth range of measurements. Tests and analyses performed concerned homogenous media, i.e. metal installations, for which the electromagnetic wave is fully reflected.

A geo-radar image of a recorded underground conduit has a hyperbolic shape in an electrically homogeneous background. Echograms of conduits, which are located close to one another, overlap leading to possible interpretation errors. The paper presents a method of experimental determination of resolving power capabilities of a given type of geo-radar equipment for the needs of detection of underground installations. It has been proved, basing on performed experiments that the horizontal resolving power of detection of underground installations depends on the type of applied geo-radar equipment and on the frequency of electromagnetic waves. Together with the increase of the dielectric constant of the medium, where underground installations are located, the horizontal resolving power also increases.