| 摘要 |
A method and apparatus for equalizing the sensitivity of an ultrasonic detection system of the type using Doppler frequency in which a test unit generates a spectrum of energy of different frequencies, and transmits the spectrum through transducers located in the areas to be protected, to create, at a receiving transducer, an average standing-wave power density proportional to the total traveling-wave power density. The average standing-wave power density is measured to provide a means of equalizing detection sensitivity. |
