| 摘要 |
An ultrasonic device for measurement of surface density of textile materials includes a generator of sinusoidal voltage, generator of rectangular pulses, key-modulator, amplifier, emitting piezoelectric converter, receiving piezoelectric converter, switch, computing unit, indicator. Additionally it includes a separate-combined piezoelectric converter, with emitting and receiving sections, additional receiving piezoelectric converter, amplifier with automatically controlled amplification, detector, analog-digital converter. A micro-computer is used as a computing unit and a multiplexer is used as a switch. |
