Patent ID: 7916299

Claim:
Device for optical detection of at least one of a phase transition between at least two media and a static state of media, which media are at least one of drawn into a line and dispensed from the line by an intake and/or dispensing device, comprising a pump for intake and dispensing of at least one of the media into and out of the line, a probe arranged at the end of the line, at least one light-emitting transmission element for emitting light across and onto the line at a measurement point intended for this purpose, at least one receiving element for receiving the light that has been influenced by the media in the line and is emitted by the transmitting element to form reception signals, an analyzer unit for analyzing the reception signals for detection of the phase transition or the static state, at least one waveguide provided between the measurement point and at least one of the transmitting element and the receiving element, said waveguide being continued up to the measurement point, wherein the waveguide is arranged in parallel with and separated from the line, and wherein at least one deflecting lens for deflecting at least one of the light emitted and the light to be detected is provided in the area of the measurement point, while the media is moved by the pump in the line in parallel to the waveguide.