Patent ID: 7417736

Claim:
A method for determining a mean radiation power P rad 0 _ of an electromagnetic radiation of a radiation source, the radiation being intensity-modulated with modulation frequency ω 0 , in a predetermined time interval t 0 to t 0 +Δt, comprising: providing a reflector, which is designed to reflect electromagnetic radiation of the radiation source and electromagnetic radiation of a test radiation source; irradiating a predetermined area of the reflector with the electromagnetic radiation of the radiation source; at least partially irradiating the predetermined area of the reflector with electromagnetic radiation of the test radiation source; measuring a ω 0 -modulated power component P test,ω 0 (t) of a reflected test radiation power P test (t) of an electromagnetic radiation of the test radiation source, the radiation being reflected from the area, in the predetermined time interval; determining a mean value P test , ω 0 0 _ of the measured ω 0 -modulated power component P test,ω 0 (t) of the reflected test radiation power P test (t) in the predetermined time interval; and determining the mean radiation power P rad 0 _ from the relationship P rad 0 _ = a · P test , ω 0 0 _ , where a is a predetermined or predeterminable constant.