| 摘要 |
<p>PURPOSE:To save the cost of the equipment by using two beams of different frequency while the transmitting/receiving sections is composed as one system. CONSTITUTION:The frequency oscillated by two oscillators 1a and 1b is different in their frequencies. The outputs of the two oscillation circuits 1a and 1b are applied to the power amplifier 2 for amplification and applied to the high-pass filter 8a and the low-pass filter 8b after passing through the trap circuit 10. The output drives the ultrasonic vibrator of the respective receiver/transmitter 9a and 9b. Passing through the filter 8a and 8b, the reflected wave is combined and inputted into the band width amplifier 3 from the trap circuit 10. The output is applied to the indicator 7 by way of the frequency converter 4, the intermediate frequency amplifier 5, the frequency discriminator 6 and the sample hold circuit 11.</p> |
