Acoustic microscopy acoustic microscope (CSAM), and C-mode scanning acoustic microscope (C-SAM). More recently acoustic microscopes based around picosecond ultrasonics systems have demonstrated acoustic imaging in cells using sub-optical wavelengths working with ultrasonic frequencies into the multi-GHz. Since the vast majority of acoustic microscopes in use today are C-SAM type instruments, this discussion will be limited to these instruments. Ultrasound is broadly defined as any sound having a frequency above 20 kHz, which is approximately the highest frequency that can be detected by the human ear. However, the acoustic microscopes emit ultrasound ranging from 5 MHz to beyond 400 MHz so that micrometre
Frequencies (album) Frequencies (album) Frequencies is the debut studio album by British techno duo LFO, released on 22 July 1991 by Warp. Originally released by Warp in the United Kingdom, "Frequencies" was released by Tommy Boy Records in the United States. The US edition of the album alters the track listing slightly, inserting "Track 14", which concludes the UK edition, in between "We Are Back" and "Tan Ta Ra"; the rest of the tracks then proceed in the same order as the UK edition. "LFO", "We Are Back", and "What Is House? (LFO Remix)" (an expanded version of "Intro") were released as