Ultrasonics, typically refers to piezoelectric transducers or capacitive transducers. The technique is also referred to as picosecond laser ultrasonics or laser picosecond acoustics. In 2016, Schunk Group acquired manufacturers for ultrasonic welding machines Ultrasonics Steckmann. The original detection mechanism used in picosecond ultrasonics is based on the photoelastic effect. The following year, the company acquired Intervox Company for their sonar, ultrasonics, and telemetry technologies. For the nonlinear effect to occur, relatively high intensity ultrasonics are required. In 1984, Branson Ultrasonics was purchased by Emerson Electric. It provided the impetus for the translation of laser ultrasonics into industrial applications. Important features of laser ultrasonics were summarised in 1990. The society publishes a peer-reviewed journal called IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control. Consumer products, automotive components, medical devices and most all industries utilize Ultrasonics. His main contributions were photographing sound waves and investigating high-power ultrasonics. However, a sharp frequency cutoff is impossible, so significant ultrasonics would still be present. Ultrasonics deals with sounds at frequencies too high to be heard by humans. In 1966, Herzfeld published a review article summarizing 50 years of developments in physical ultrasonics.