Device for measuring vibration amplitudes of the blade tips in a turbomachine

A device for measuring vibration amplitudes of the blade tips in a turbomachine, comprising:

• a support mounted in an orifice of a casing of a turbomachine and wherein are housed first and second optical guides exiting inside the casing across from the tips of the blades of a turbine wheel, with the first optical guide being connected to a source of light for the propagation of a light signal to the blade tips and the second optical guide being connected to means for processing and analysing the light signal reflected by the blade tips,
• wherein each optical guide comprises an optical fiber connected by a mechanical connector to a rigid needle of which a core is made of a material able to transmit a light signal and which is resistant to temperatures equal to 1100° C. and which exits at a distal end thereof inside the casing across from the blade tips, and
• wherein each connector comprises an axially split tube wherein are maintained in contact the proximal end of the needle and the distal end of the optical fiber.