Abstract
We describe an optical measurement system based on a fiber optic sensor that detects, with 20–30 μ accuracy, displacements of a remote reflective target at a distance of 200–500 mm. The light source is a single mode laser whose wavelength is ramped linearly in time. The requirements of laser ramp linearity and coherence in order to achieve the desired sensitivity are elaborated. The sensor can be operated with comparable accuracy in single-pass mode for a well aligned target, or in double-pass mode for a somewhat misaligned target. This sensor can be employed for remotely sensing minute displacements of objects in harsh environments, including the cryomagnets in particle accelerators.
Published Version
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