DILATOMETER Russian patent published in 2018 - IPC G01N25/16 

FIELD: physics.

SUBSTANCE: invention relates to the field of material research by means of thermophysical measurements, namely to the devices for measuring the temperature coefficient of linear expansion (TCLE). The dilatometer comprises a heating chamber with a detachable tube, in which the test sample and pushers are horizontally mounted tightly in contact with the opposite ends of the sample, measuring mirrors fixed at the ends of the pushers and located outside the heating chamber, a laser, and an optical system for measuring the elongation of the sample. To create a constant in magnitude and symmetrical pushing of the pushers to the test sample, a clamping system is used. In the optical system, an interferometer is used to measure the elongation of the sample, including a beam splitter, dividing the laser beam into the working and reference beams, four bypass mirrors for the working beam, return mirrors for the working and reference beams, respectively, and a photodetector. Electrical signals from the photodetector and the thermocouple, which registers the heating temperature of the sample, are transmitted to the PC, where they are synchronously recorded. The dilatometer is calibrated with a sample from the reference material with known characteristics of the TCLE change in the required temperature range. For this, elongation of the pushers is determined by subtracting the calculated elongation of the reference sample from the measured total elongation of the "reference sample-pusher" system. The reference sample is replaced with the test sample. When the latter is heated in the same program as for the reference sample, its elongation is determined by subtracting the previously obtained elongation of the pushers from the total measured elongation of the "test sample-pusher" system. According to the obtained data, the value of the mean integral TCLE is determined.

EFFECT: increasing the accuracy of measuring the elongation of the sample.

5 cl, 4 dwg