| 摘要 |
A light based distance, velocity and acceleration sensor which uses phase di fference to determine the desired measurement. A laser signal is modulated by an oscillator signal and reflected off an object to a signal receiver. The reflected laser signal and the osc illator signal then pass through a dual path conditioning circuit, where the path lengths a nd circuit elements of the two paths are identical to ca ncel the effets of propagation delays in an output signal. The conditioned signal s are passed through a phase comparator, to produce a si gnal indicative of the phase difference between the oscillator signal and the ref lected laser signal. The phase difference is directly pr oportional to the distance between the sensor and the object.
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