Divider: The Laser-Powered Drum Machine

The rise of electronic music in recent years has propelled the drum machine into the public eye more prominently than ever before. With electronic music showing very little indication of going away anytime soon, expect to see intriguing experiments and projects combining music and technology.

Such is the case with “Divider,” a large laser-powered drum machine installation, says Engadget, created by Russian artist Vtol. The machine, described by Vtol as “an autonomous light-music installation,” serves as a collaborative project between Polytechnic Museum Moscow and Ars Electronica Lins.

Would you travel to see the Laser Powered Drum Machine if you were in Russia?

The machine works by utilizing seven red lasers, 42 fans, a mono sound system, and four Arduino controllers. Divider’s laser beams are disrupted by fans with a photo sensor on the end, which monitors the presence or absence of laser light. The lasers serve as “independent binary variables,” creating the basis from which all of Divider’s sounds originate. The speed of the multiple fans helps to create the range of sounds, due to the modulation of the laser’s light.

The Inspiration for Divider

Divider was inspired by Rhythmicon, often considered the first electronic drum machine, invented by Léon Theremin in 1931. Rhythmicon used spinning disks and optical sensors to create its unique sounds. Drawing parallels between Vtol’s 21st-century Divider and Theremin’s Rhythmicon is far from a challenge.

Unfortunately, if you want to see Divider up close and personal, you’ll have to head to Russia to see it on display at Polytechnic Museum Moscow. Currently, there are no plans to tour or sell the device once it is no longer on display.

You can check out the Divider in action below:

Explore even more technology with our article on the Star Trek Replicator, part of our Science Fiction or Science Fact? Series. 

Analysis of penetration depth fluctuations in single-mode fiber laser welds

By: Jung-Ho Cho, Dave F Farson, Matt J Reiter

The Ohio State University, Laboratory for Multiscale Processing & Characterization,

Single-mode fiber lasers produce high power beams with nearly perfect beam quality, meaning that they can be focused to a very small diameter spot with relatively long focal length optics. It is becoming increasingly clear that these laser beam optical qualities are not always ideal for welding. Welds made with these lasers are uniquely sensitive to a defect known as penetration spiking. Such abrupt fluctuations in weld penetration depth have long been a problem in electron beam welding but have not been observed in laser welding before the advent of high power single-mode lasers. In this work, the effect of laser power, travel speed and focus length and spiking severity was studied and techniques for reducing spiking were demonstrated. As an initial step, the frequency response of the weld penetration depth to sinusoidal power modulations was quantified. It was found that the laser weld keyhole responded as a second-order dynamic system for modulation frequencies in the range from 100Hz to 1000Hz. Thus, at upper end of this range, the sinusoidal response of the laser weld penetration to the sinusoidal power modulation was practically undetectable above the background noise of natural “random” spiking fluctations. However, the frequency response tests also showed that  power modulation in the frequency range from 900Hz to 3kHz had the good effects,  significantly decreasing the magnitude of the spiking penetration fluctuations. At some frequencies, the sinusoidal power modulation was able to completely eliminate spiking, but the effect was very sensitive to parameters and hence not very reliable for actual applications.  A second technique for spiking suppression in electron beam welds is “beam stirring”, where the focus spot is scanned in small circles at high frequency as it is scanned along the weld joint at the welding travel speed. This beam stirring technique was investigated for spiking suppression in the single-mode fiber laser welding process using a galvanometer scanner to produce simultaneous circular oscillation and linear travel of the focus spot. This spiking suppression technique was found to be much less sensitive to parameter settings and nearly eliminated spiking over broader ranges of circular oscillation frequency and diameter.

The above brief overview was extracted from its original abstract and paper presented at The International Congress on Applications of Lasers & Electro-Optics (ICALEO) in Orlando, FL. To order a copy of the complete proceedings from this conference click here