Interferometric laser sensor having a linear laser cavity

Details Interferometric laser sensor having a linear laser cavity Interferometric laser sensor having a linear laser cavity

1997-02-12

2000-03-07

Turner, Samuel A.

Optics: measuring and testing

By particle light scattering

With photocell detection

356350, G01B 902, G01C 1964

Patent

active

060347708

ABSTRACT:
An interferometer-type laser sensor acts concurrently as a light source and to measure external physical quantities such as rotation, magnetic field, current and fluid velocity. The interferometer-type laser sensor has a laser resonator having a laser gain medium, optical path and two or more reflectors to reflect incident light toward an opposite direction. In addition, a device is provided for interfering light not reflecting on the said reflectors but passing through. A signal processor is provided to detect and process interference signal generated from the interfering device. The laser sensor has a distinction over the conventional passive fiber-optic gyroscope as followings: first, expensive polarization maintaining fiber or polarizer is not required, since there is no polarization error which is readily appeared at the conventional passive fiber-optic gyroscope. Secondly, wavelength-dependent errors generating during the use of a light source of wide width decrease remarkably by employing a laser of narrow width. Thirdly, an external light source is not required, since a laser resonator acts concurrently as a light source and measures external physical quantity.

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