A simple high-sensitivity interferometric position sensor for test mass control on an advanced LIGO interferometer
نویسنده
چکیده
A small Michelson interferometer has been con®gured as a tracking mirror displacement sensor in order to achieve both large dynamic range (2.1 mm) and excellent sensitivity 2 10ÿ14 m= Hz p across a broad frequency range (6 Hz±3 kHz). The interferometer is illuminated by a simple LED, uses broadband, non-polarising beamsplitters and contains no lensing optics. A DC-coupled balanced detector provides an error signal that is used to position the tracking mirror of the Michelson interferometer so as to maintain an interferometer operating position close to the centre of a particular fringe. The total interferometric sensor provides a small, simple and cost-eective means of achieving high-resolution displacement measurements.
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