OPTICAL PYROMETER Russian patent published in 2001 - IPC

FIELD: measurement of radiation from working blade of turbine of gas-turbine engine. SUBSTANCE: optical pyrometer includes outer case with deflector and ring vortex space between them communicating at outlet with ring slit for air cooling of lens and with groove for discharge of contaminants. Novelty of invention consists in that ring space communicates with slit for air cooling of lens via recess in hole behind circular baffle on inner surface of bushing and with ring groove for discharge of contaminants via open diffuser and space of sudden expansion. Ring space at inlet is connected to tangential duct for supply of air. EFFECT: increased operational reliability of optical pyrometer. 1 cl, 3 dwg