Abstract
A novel precise force measurement based on a Y-shaped cavity dual-frequency
laser is proposed. The principle of force measurement with this method is analyzed,
and the analytic relation expression between the input force and the change in the
output beat frequency is derived. Experiments using a 632.8-nm Y-shaped cavity He-Ne
dual-frequency laser are then performed; they demonstrate that the force measurement
is proportional to a high degree over almost five decades of input signal range. The
maximum scale factor is observed as 5.02 \times 10^9 Hz/N, with beat frequency
instability equivalent resolution of 10^{-5} N. By optimizing the optical and
geometrical parameters of the laser sensor, a force measurement resolution of
10^{-6} N could be expected.
© 2011 Chinese Optics Letters
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