OPTICAL PYROMETER Russian patent published in 2001 - IPC

FIELD: measurement of radiation from working blade of turbine of gas-turbine engine. SUBSTANCE: optical pyrometer has outer case with deflector and ring vortex space between them communicating across outlet with ring slit for air cooling of lens and with groove for discharge of contaminants. Novelty of invention lies in that ring space communicates with slit for air cooling of lens via apparatus for air swirl having inside grooves made at acute angle with regard to direction of rotation of flow in ring space and via holes in intermediate bushing and with ring groove for discharge of contaminants via ring slit in peripheral diameter of ring vortex space and mixing space. In this case ring space at inlet communicates with tangential duct supplying air. EFFECT: increased operational reliability of optical pyrometer. 4 dwg