Diseñan el termómetro más sensible del mundo

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Según explican en el artículo, publicado en Physical Review Letters, este aparato ha sido capaz de medir la temperatura con una precisión de 30 millonésimas de un grado. "Creemos que esta es la mejor medida que jamás se ha hecho de la temperatura a temperatura ambiente", ha indicado el autor principal del trabajo, Andre Luiten, quien ha precisado que con este termómetro es posible hacer mediciones más sensibles de la temperatura en ambientes criogénicos (a muy bajas temperaturas) cercanas al cero absoluto.

El documento describe un nuevo y muy sensible, pero poco ortodoxo, termómetro que utiliza la luz para medir la temperatura. El termómetro inyecta dos colores de luz (rojo y verde) en un disco cristalino altamente pulido. Los dos colores viajan a velocidades ligeramente diferentes en el cristal, en función de la temperatura de éste. "Cuando calentamos el cristal nos encontramos con que la luz roja se ralentiza con respecto a la luz verde", ha apuntado Luiten.

"Al obligar a la luz a circular miles de veces alrededor del borde de este disco, de la misma manera que hace el sonido, se concentra y se refuerza en las curvas con un fenómeno conocido como 'galería de los suspiros', es cuando se puede medir la diferencia minúscula en la velocidad de amabas luces con gran precisión", apunta el estudio.

Luiten dice que los investigadores han desarrollado esta nueva técnica y que ésta podría ser rediseñada para mediciones ultrasensibles de otras cosas, como la presión, la humedad, la fuerza o la búsqueda de un producto químico determinado.

"Ser capaz de medir diferentes aspectos de nuestro entorno con un alto grado de precisión y con un instrumento lo suficientemente pequeño como para llevarlos a todas partes. se trata de un trabajo que viene a revolucionar la tecnología", ha concluido el autor.

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