Chinese Optics Letters, 2011, 9 (10): 101201, Published Online: Jul. 13, 2011
Precise force measurement method by a Y-shaped cavity dual-frequency laser
激光传感 力测量 Y型腔双频激光器 120.4640 Optical instruments 120.5475 Pressure measurement 140.1340 Atomic gas lasers
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.
Guangzong Xiao, Xingwu Long, Bin Zhang, Geng Li. Precise force measurement method by a Y-shaped cavity dual-frequency laser[J]. Chinese Optics Letters, 2011, 9(10): 101201.