| 摘要 |
An electromechanical sensor produces an electrical signal in response to a change in a physical parameter being monitored by the sensor. An optical phase modulator is arranged such that electrical signals from the electromechanical sensor cause a phase change in optical signals propagating in the two legs of the interferometer. The phase change is obtained by forming the interferometer to have a phase modulator in each leg. Applying the electrical signal to the phase modulators, which are connected in push-pull, changes the optical path length difference between the interferometer legs and produces an optical signal that can be transmitted to a remote location. A photodetector at the remote location converts the optical signal into an electrical signal that can be processed to measure changes in the parameter. The sensors may be used singly, or a plurality of sensors may be arranged in a geophone array. |
