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ATR sonde

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ATR stands for "attenuated total reflection." By passing from ATR crystal (high refractive index) to the solution (low refractive index), the light beam is usually fully reflected. However, in practice, the light beam passes partially in the solution and can be absorbed. The total reflected light is then reduced to give an absorption spectrum in transmission. ATR probes are used for measurements of strongly absorbing solution.
The ATR probe head has a 3 sapphire reflections head that is immersed directly in the solution.

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