Abstract
Temperature is one of the parameters that affects development of embryos. Therefore, it is important to keep stability of temperature in the chambers of embryo-incubators. In modern incubators, some accuracy of temperature has been achieved, although fluctuations are not eliminated yet. The aim of this research was to improve temperature accuracy by reducing of fluctuations. In modern benchtop incubators, a heating element is switched on and automatically shuts off when the desired value is reached. The heating element continues to heat up to a certain temperature after switching off, and the reverse process takes place during cooling. Inappropriate temperature may adversely affect the embryo. To control temperature more precisely, a new principle with infrared sensor has been developed, where power to heater is supplied with different PWM duty cycles. As the results, much more stable temperature with less fluctuations were achieved in comparison to modern systems using thermocouples and thermistors.
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