| 摘要 |
A method of, and apparatus for, measuring the temperature of an environment by measuring the speed of sound or vibrational waves provided by background sound or vibration within the environment. The method may include measuring the frequency spectrum of sound or vibrational waves within a resonant cavity and using the obtained frequency spectrum to determine the speed of the sound or vibrational waves. The resonant cavity 4 may be tubular resonant cavity having opposing ends 6 , 8 and a sensor 10 may be located within an end of the cavity. The method may further comprise measuring at least one additional frequency spectrum corresponding to sound or vibrational waves outside of the resonant cavity using a sensor (110, fig 2), those waves also produced by background sound or vibration within the environment. |
