| 摘要 |
A proximity sensor includes an active sensor (12), a passive target (14), and a measurement circuit (24). The active sensor (12) includes an active resonant tank circuit (26) that includes an excitation source, a first capacitor, and a first inductor. The passive target (14) includes a passive resonant tank circuit (34) that includes a second capacitor and a second inductor, where magnetic coupling between the first inductor and the second inductor varies as a function of physical displacement of the first inductor and the second inductor with respect to one another. The measurement circuit (24) is configured to measure a coupled resonant frequency response in the active resonant tank circuit and provide a measured distance output based on the coupled resonant frequency response. |
