Patent ID: 8309924

Claim:
A circuit arrangement for generating light-dependent and temperature-dependent signals representing properties of a scene, the circuit arrangement comprising: a number of first and second sensor elements which generate a number of first and second electrical signals that are dependent on impinging electromagnetic radiation from a surface located in the scene, said surface having unknown emission properties, and a circuit part designed to determine a temperature as a function of the first and second signals, wherein the first sensor elements are designed to generate the first electrical signals in a manner dependent on electromagnetic radiation from a first wavelength range comprising visible light and infrared radiation, wherein the second sensor elements are designed to generate the second electrical signals in a manner dependent on electromagnetic radiation from a second wavelength range predominantly comprising infrared radiation, wherein the first wavelength range overlaps the second wavelength range such that the second wavelength range is a subrange of the first wavelength range, and wherein the circuit part is further designed to form a quotient from the first and second signals in order to eliminate any influence of the emission properties in the process of determining the temperature.