| 摘要 |
<p>Several sensors (608) are provided for determining one of a number of physical properties (676) including pressure, temperature, and other physical conditions. The sensors feature a resonant circuit with an inductor coil which is electromagnetically coupled to a transmitting antenna (602) for receiving an excitation signal (672). The resonant frequency (674) and bandwidth (674) of the sensor circuit is determined using an impedance analyzer (612), a transmitting and receiving antenna system (600), or a chirp interrogation system. The sensors are constructed so that either the resonant frequency or bandwidth of the sensor circuit, or both, are made to depend on the physical properties such as pressure, temperature, presence of a chemical species, or other conditions of a specific environment so that the physical properties can be calculated from the resonant frequency and bandwith determined.</p> |
