Device for determining the thermal conductivity of the material of bore holes, with the use of the laser flash - process in the case of measurements in the drilled hole.

摘要

The apparatus (1) for determining the thermal conductivity of the material of bore holes, with the use of a laser flash - method, especially a heat conductivity scanning in the case of measurements in the drilled hole (4) with the use of a comparison body, at least comprising– a film (7) which, with the wall of the bore hole (5) according to a pneumatic pressing a double layer (23) is formed, in which one layer, the film (7), of two layers (7, 4) of the double layer (23) is provided in a defined manner,– an externally controlled pneumatic device with a pneumatic line (8), which for the expelling of water from the drilled hole (4) by means of the film (7) by means of a pressure regulation in the measuring chamber (3) via the pneumatic line (8) is provided,– a pressure - / moisture resistant housing (30) for the in the housing (30) of the measuring apparatus (2),– at least one plate (15, 16, 17), which are partly made of heat by radiation cannot material and at least one pressure resistance and resistance to moisture to 20 bar has,– a on the housing (30) against a spring support, a direction (33) sheet fixed spring ring (6) for the elastic tensioning of the foil (7) by means of compressed air,– at least one ir - temperature sensor (13) for the active temperature regulation, into the measuring chamber (3) via the pneumatic line (8),– a module (14) in connection with one of the disks (17) for a distance determination of the heating point / measurement range (41) on the film (7) by means of light reflection on the, as far as possible, only for a frequency reflective film (7),– an evaluation unit for determining the thermal conductivity of the evaluation of the detected measured values of the double layer (23) and determination of the thermal conductivity (λ) and further heating parameter by means of program-oriented means in the evaluation unit, as well as– the comparison bodies with known predetermined thermal properties: the thermal conductivity, the density and of the specific heat capacity.