초록 ▼

A sensor for measuring stress, temperature, pressure, sound, etc. comprising an optical waveguide, preferably an optical fiber waveguide, a light source which injects light into one end of the waveguide, a deformer contacting and deforming the waveguide to cause light to couple from originally excit

A sensor for measuring stress, temperature, pressure, sound, etc. comprising an optical waveguide, preferably an optical fiber waveguide, a light source which injects light into one end of the waveguide, a deformer contacting and deforming the waveguide to cause light to couple from originally excited modes to other modes, and an optical detector to detect the change in light coupling caused by deformation of the waveguide.

대표청구항 ▼

A sensor comprising an optical waveguide having means for transmitting light in at least two groups of modes denoted A and B, an optical light source means for injecting light into said waveguide so that light transmitted at least initially along said waveguide will be substantially in one of said g

A sensor comprising an optical waveguide having means for transmitting light in at least two groups of modes denoted A and B, an optical light source means for injecting light into said waveguide so that light transmitted at least initially along said waveguide will be substantially in one of said groups, deformer means responsive to an external stress for deforming a region of said waveguide with such deformation being effective to change the character of the transmission of at least a portion of the light in the vicinity of the deformation from said one group to the said other group of modes, the change being approximately a linear function of the change in the external stress, and an optical detector having means to detect a change in the light in said other group only and thereby monitor said external stress.