The rotational frequency of aero-engine has an important influence on its working efficiency

safety and reliability

too fast and too slow numercical value will affect the running state of engine. Test technology of engine of our country started relatively late

so the measurement of engine parameters is particularly important. A hightemperature rotating speed sensor based on eddy current principle is designed

which meets the requierment of engine rotating speed mesaruement under high temperature condition

it can effectively monitor efficiency of engine operation.