APPARATUS FOR OPTICAL DETECTION OF CONTAMINATION, RADIATION SOURCE, METHOD FOR OPTICAL DETECTION OF CONTAMINATION

摘要

Apparatus and methods for optical detection of contamination are disclosed. In one arrangement, an excitation source (24) directs excitation radiation (26) into or onto an entity (22) to be tested. A first optical concentrator (28) is configured to receive radiation emitted due to fluorescence indicative of contamination in or on the entity (22). The emitted radiation (30) is received via an input surface (32). Concentrated radiation is output via an output surface (34). The first optical concentrator (28) comprises a first wavelength converting element that converts the received radiation to longer wavelength radiation prior to the output of the radiation via the output surface (34). A detection system (38) detects radiation output from the output surface of the first optical concentrator.