METHOD FOR DETERMINING THE PHASE TRANSITION TEMPERATURE AND THE VOLUME OF A LIQUID SAMPLE USING A THERMOELECTRIC ICING SENSOR Russian patent published in 2022 - IPC G01N25/12 G01K17/06 B64D15/20 

FIELD: measuring technology.

SUBSTANCE: invention relates to the field of temperature measurement and thermometry and can be used in the operation of icing sensors for remote detection of icing and determination of environmental conditions similar to the conditions for the formation or predisposition to the formation of icing of various surfaces. A method for determining the phase transition temperature and the volume of a liquid sample using a thermoelectric icing sensor containing a thermoelectric module, a temperature sensor and a thermoelectric heat flow sensor equipped with a contact surface in contact with the sample consists in: setting and stabilizing the initial temperature of the contact surface by adjusting the thermoelectric module. Then the contact surface is cooled at a constant speed by regulating the thermoelectric module and simultaneously taking readings from the temperature sensor and the heat flow sensor. Next, the temperature of the phase transition at the cooling stage is determined by a sharp jump in the temperature of the crystallizing sample and the moment of the end of crystallization is determined by a change in the heat flow. Then the contact surface is heated to the initial temperature by means of a thermoelectric module and simultaneously readings of the temperature sensor and the heat flow sensor are taken and the phase transition temperature is determined at the stage of heating the crystallized sample by changing the slope of the temperature dependence on time at the time of completion of the melting of the sample. Next, the mass of the sample is determined by the dependence of the heat flow on the time received from the heat flow sensor, and the volume of the liquid sample, taking into account the measured amount of heat of crystallization of the sample, the specific heat of crystallization of the sample and the density of the liquid sample.

EFFECT: increase in the accuracy of measurements of both the phase transition temperature and the quantitative characteristics of the sample.

5 cl, 4 dwg