Created the world's most precise thermometer – light

Physics-researchers from the University of Adelaide (Australia) under the guidance of Professor andré Luiten of zostalismy accurate thermometer in the world. It can be used to measure the temperature with a precision of 1/30 of a billionth of a degree per second. As you know, the atoms of any substance are in constant motion and the speed of their movement not in the least affected by ambient temperature. The thermometer is a polished crystalline disk, which contains two beams of red and green. Depending on the temperature of the crystal the speed of their passage is changing.

So when heating the crystal a beam of red light slightly behind the green. Further there is a kind of circulation, which resulted in the rays of thousands of times crossing the disk, creating well-known in physics phenomenon of "whispering gallery". Something similar, only in relation to sound can be observed in St. Paul's Cathedral in London, or among the Quiet walls of the reservoir in the Barossa. Scientists it remains only to measure the existing difference in speed with maximum accuracy.

According to Professor A. Luiten, the developed method will allow in the future to produce high-precision measurement of other quantities, for example, pressure, humidity, force, which will be of great importance for scientific research in various fields.

Source: techcult.ru