| 摘要 |
<p>An acoustic wave device can be used in a passive sensor when an interrogation signal is inductively coupled into the sensor. The advantage of inductive coupling is that the interrogation signal can power the sensor. The acoustic wave device can be sensitive to environmental factors, such as pressure, temperature, or chemicals. An environmental factor can cause a change in the acoustic wave device resulting in changing the sensor's fundamental frequency. An interrogation circuit containing a grid dip oscillator can produce the interrogation signal, detect the sensor's fundamental frequency, and thereby produce a measurement of the environmental factor.</p> |
