| 摘要 |
<p>A sensor and a method for ascertaining a gap between a stationary member and a rotating member are disclosed. The sensor comprises a beam of electromagnetic radiation to be projected across a gap between the stationary member and the translating member, a reference detector having a reference field of view (FOV) and a signal detector having a signal FOV. The sensor is to be mounted on the stationary member. The electromagnetic radiation beam, the reference FOV and the signal FOV intersect in a volume including the gap, and the gap is calculated from the reflected electromagnetic radiation received by the reference detector and by the signal detector. The gap can be determined from a ratio between a rise time in the signal pulse and a rise time in the reference pulse, or a ratio between a fall time in the signal pulse and a fall time in the reference pulse, or a ratio between a delay time in the signal pulse and a delay time in the reference pulse, among other features in the signal and reference pulses.</p> |
