SPI module 13 SPI module 1 정리 - ③ * Continous wave / Pulsed wave Continous wave = CW Pulsed wave = PW is continously transmiiting and receiving sound transmit in a series of short pulses must have two crystal. same crystal used for both transmission and reception. uniform amplitude and frequency. is used in all imaging US sound system except CW Doppler. Duty factor = 1 Duty factor < 1 * PRF : Pulse Repetition Frequency - the num.. 2022. 7. 17. SPI module 1 정리 - ② * Frequency = 1 / period - number of events that occur in a specific period of time. - unit : hertz, Hz / 1Mz=1,000,000Hz - determined only by the sound source, not by the medium * Period = 1 / frequency - period is the time takes for a sound wave to complete 1 cycle - unit : second, S, ms, μs * wavelength - wavelength is the distance over which one complete wave cycle occurs. - wavelength is th.. 2022. 7. 16. SPI module 1 정리 - ① * unit Prefix Meaning Factor Power of 10 prefix Symbol giga billion 1,000,000,000 10^9 G mega million 1,000,000 10^6 M kilo thousand 1,000 10^3 k centi hundredth 0.01 10^(-2) c milli thousandth 0.001 10^(-3) m micro milionth 0.000001 10^(-6) μ nano billionth 0.000000001 10^(-9) n * scientific notation (과학적 표기) ex) 1540 m/s → 1.54 * 10^3 m/s * Sound wave - Sound is a mechanical process = mechanic.. 2022. 7. 16. 이전 1 다음
