Method and Device For Measuring the Concentricity of an Optical Fiber Core

A device for measuring the position, especially the concentricity, of the core (21) of an optical fiber (19) relative to a reference axis (22), comprising a means for determining the position of the intersection of the reference axis (22) with an optical face (23) on the end of the optical fiber (19), a means (17) for injecting light into the core (21) of the optical fiber (19), an objective (30) and a means (4) for observing, in a plane (5) conjugate with the optical face (23), the light emitted by the core (21) of the optical fiber (19), characterized in that the objective (30) has a numerical aperture (sin β) smaller than the numerical aperture (sin α) of the optical fiber to be measured.

A method for measuring the concentricity of the core (21) of an optical fiber (19) relative to a reference axis (22), the optical fiber (19) having an optical face (23) at one end, in which method light is injected into the core (21) of the optical fiber (19), the light emitted by the core (21) is observed by means of an objective (30) and the position of the intersection of the reference axis (22) with the optical face (23) is determined, characterized in that the propagation modes that are peripheral to the central axis (31) of the objective (30) are filtered out.