Patent ID: 8043568

Claim:
An ozonesonde for in-situ measurement of stratospheric ozone concentration profiles by balloon launches, the ozonesonde comprising: a measurement cell including an aqueous reaction solution having a salt content and melting and boiling points dependent thereon; a pump configured to pass ambient air through the aqueous reaction solution; and a hydrothermal buffer including a vessel surrounding the measurement cell and being filled with water to a level that is at least as high as a level of the aqueous reaction solution in the measurement cell, a melting point of the water being higher than the melting point of the aqueous reaction solution and a boiling point of the water being lower than the boiling point of the aqueous reaction solution so that a temperature in the measurement cell is stabilized between the melting point and the boiling point of the aqueous reaction solution, upon the ozonesonde reaching the stratosphere, by a transfer of energy to or from the aqueous reaction solution in a thermodynamically passive process occurring between the aqueous reaction solution in the measurement cell and the water which surrounds the measurement cell, the thermodynamically passive process including an earlier phase transition of the water before a reaching of a triple point of the water.