Radiation Pyrometry in Turbosupercharger Testing

With increase in operating temperatures and speeds of turbines such as are used in turbosuperchargers, the demands for turbine-wheel and bucket temperature measurement have become increasingly exacting. Requests appear for such measurements under operating conditions with measurement tolerances varying from ±50 F in flight test to ±5 F in certain ground tests. This paper outlines the procedures used for measurements ranging from as low as 300 F up.