![]() Use of this apparatus allows the investigation of the high-temperature thermodynamic properties of important rock-forming minerals. After adjusting for errors caused by heat, the thermal expansion data measured with the differential laser-interferometer are in good agreement with previous reports. The overall sensitivity with which we can detect changes in length is about 1/100 of the wavelength of the He-Ne laser (1/100 of 0.6328 × 10 −6 m). This improvement of the basic laser-interferometer allows us to remotely measure the thermal expansion of minerals with high precision. A good introduction on this topic is found in. The main feature of the apparatus is simultaneously monitoring two fringe signals that are 90° out of phase. Thermal expansion measurements on glass are usually performed using push rod dilatometers (single push rod, or differential double push rod) 16, 17. Thermal effects affecting Persistent Scatterer Interferometry (PSI) have been observed by several authors 1-4. The changes in the distance between two faces of a stepped shape sample are measured. ![]() ![]() The thermal expansion of single-crystal Al 2O 3 (corundum) was measured up to 1000 K with the differential laser-interferometer. The differential laser interferometry method and its application for measuring the thermal expansion of samples is described. ![]()
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