Patent ID: 7274867

Claim:
A temperature determining device for a receiving device for receiving a semiconductor wafer, with a temperature sensing element, which records a temperature profile for a time period from a first point of time of thermal contact of the semiconductor wafer with the temperature sensing element up to a second time of thermal equilibrium between the semiconductor wafer and the temperature sensing element, and with an evaluation device which determines back at the second point of time the temperature of the semiconductor wafer at the first point of time of thermal contact of the semiconductor wafer with the temperature sensing element based on the time period between the first point of time of thermal contact and the second point of time of thermal equilibrium of the semiconductor wafer and the temperature sensing element and based on a temperature of the semiconductor wafer reached at the second point of time of thermal equilibrium of the semiconductor wafer and the temperature sensing element with use of an equation T 0 =T G *e kΔt +T U *(1−e kΔt ), where T U is an ambient temperature and k is a time constant, the time constant k being determined by an equation k=(α*A)/(c*m), where α corresponds to a heat transfer coefficient of the semiconductor wafer in still air, A corresponds to an area of an entire surface of the semiconductor wafer, c corresponds to a specific heat capacity and m corresponds to a mass of the semiconductor wafer, and a display element, which is designed to display the temperature of the semiconductor wafer at the time of thermal contact between the semiconductor wafer and the temperature sensing element.