According to the request of tip clearance measurement

a new optical fiber sensor is designed.Its configuration is single-bundle optical fiber for transmitting laser beam

and multi-bundle optical fibers for receiving the scattered light.The transmitting fiber lies in the center

and multi-bundle receiving fibers are around it.By ratio operation of light intensity of different receiving optical fibers

the effect of tip surface reflectivity variation on measurement results is eliminated

it can as well as reduce the effect of tip surface and inter-angle of sensor on measurement results.With the help of rotating speed synchronization sensor

it can measure all the blade tips real time.When the rotating speed of blades changes from 0

1

2000r/min

the measurement range of tip clear

ance is from 0

3

mm

and the measurement precision is 25μm.