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Rotary Seal

American High Performance Seals (Pittsburgh, PA) has announced its Rotaflon rotary seal which minimizes shaft damage and reduces power consumption. The seal accommodates changing operating conditions, low breakout force, and provides superior chemical resistance. It accommodates surface speeds to 5900 ft/min and temperatures from -58 F to +500°F and is suited for poor lubrication conditions.

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Stepper Drive

Applied Motion Products’ (Watsonville, CA) ST10-Si stepper drive delivers 24 to 80 Vdc with peak outputs to 10 A. The drive is protected against overvoltage, undervoltage, overtemperatures, and external output shorts. Upon start-up, the drive measures motor parameters including resistance and inductance, and uses this information to optimize system performance.

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Wire Thread Insert

The Spiralock Drive Notch wire thread insert from Spiralock Corp. (Madison Heights, MI) exhibits no tension loss after 24 hours of continuous vibration testing and no fatigue indication. The inserts are simply threaded into any STI tapped hole, with no tangs to break off, retrieve, or account for. The insert resists shock, vibration, and thermal extremes, and provides improved joint integrity in softer materials such as aluminum, zinc, magnesium, and plastic. The insert also eliminates stress in the parent material and requires no staking, keys, or lock rings to hold them in place.

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Integrated Motor/Controller

The I2 integrated motor and controller from Specialty Motors (Valencia, CA) combines a brushless DC servomotor with built-in drivers, controllers, and feedback devices. Applications software provides motor control, requiring the engineer only to select velocity or position control mode.

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Fiber Optic Communications Systems

Communications and, more recently telecommunications, are needs deeply engrained in human history. These needs have significantly evolved over time enabling today’s content-rich (text, music, images and video, etc), real-time and multi-location exchanges through electrical, optical or, more broadly, electromagnetic signals conveyed by different media. Among the more versatile is optical fiber.

Posted in: Features, ptb catchall, Photonics, Articles

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Designing Converged Optical Ethernet Networks

Transport networks have witnessed two significant trends over the past half-decade or so. The first has been an explosion in the bandwidth these networks can support and the distances over which they can support it. This is due to the advent of cost-effective wavelength division multiplexing (WDM) and dense-WDM (DWDM), as well as a slew of technologies that extend transmission range, such as sophisticated optical amplifiers. The second has been the need to support a variety of traffic types (voice, video, data) and services: virtual private networks (VPNs), high-speed Internet (HSI), video-on-demand (VoD) and videoconferencing, and IPTV, to name a few. This is due to the need to simplify the network by collapsing intermediate layers and protocol stacks, thus reducing interface and node counts (and, hence, cost) in the carrier network. Thus, transport networks have migrated from being primarily voice-dominated to multi-service supporting infrastructures.

Posted in: ptb catchall, Applications, Photonics, Application Briefs

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Compact Two-Dimensional Spectrometer Optics

This unit would feature coarse and fine resolution along two orthogonal axes. NASA’s Jet Propulsion Laboratory, Pasadena, California The figure is a simplified depiction of a proposed spectrometer optical unit that would be suitable for incorporation into a remote-sensing instrumentation system. Relative to prior spectrometer optical assemblies, this unit would be compact and simple, largely by virtue of its predominantly two-dimensional character.

Posted in: Tech Briefs, ptb catchall, Photonics, Briefs

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