Optical radiation sensor device and use in a radiation source module

摘要

An optical radiation sensor device for detecting radiation in a radiation field, the device comprising: a radiation collector (152) for receiving radiation from a predefined arc around the collector within the field and redirecting the received radiation along a predefined pathway; and a sensor element (154) capable of detecting and responding to incident radiation along the pathway. A radiation source assembly, a radiation source module and fluid treatment system comprising the optical radiation sensor are also disclosed.