Features

The Basics of Encoder Selection

Many small motor applications, such as robotics, industrial equipment, and consumer products, employ digital incremental encoders for feedback sensing. Encoder selection is therefore an important part of the system design process. Choosing the best encoder for the job requires knowledge of the most important encoder properties as well as the application’s control requirements.

Posted in: Articles, Motion Control, Electronic control systems, Integrated circuits, Electronic control systems, Integrated circuits, Supplier assessment
Read More >>

Servo Couplings for High-Tech Systems

Proper coupling ensures a design will meet performance requirements and have a long, trouble-free life.

Couplings are a critical part of system performance in high-tech applications, yet they are often one of the last components to be specified. Selecting the proper coupling ensures the equipment will meet performance requirements and have a long, trouble-free life. Poor coupling selection can lead to high maintenance costs, frequent downtime, and imprecise positioning.

Posted in: Articles, Joining & Assembly, Motion Control, Power Transmission, Sensors and actuators, Sensors and actuators, Materials properties, Fittings, Parts
Read More >>

Metallic Glass Shatters Gear Limitations

Gears play an essential role in precision robotics, and they can become a limiting factor when the robots must perform in space missions. In particular, the extreme temperatures of deep space pose numerous problems for successful gear operation. At NASA’s Jet Propulsion Laboratory (JPL) in Pasadena, CA, technologist Douglas Hofmann and his collaborators aim to bypass the limitations of existing steel gears by creating gears from bulk metallic glass (BMG).

Posted in: Articles, Aerospace, Manufacturing & Prototyping, Metals, Mechanical Components, Motion Control, Motors & Drives, Power Transmission, Robotics, Robotics, Alloys, Glass, Gears, Durability, Durability, Spacecraft
Read More >>

Adding SCADA to a Hydraulic Power Unit

With an increased focus on plant productivity and equipment reliability, Supervisory Control and Data Acquisition (SCADA) systems have become vital tools to reduce downtime while increasing asset reliability in hydraulic systems. A SCADA system is a computer system that essentially gathers and analyzes real-time data.

Posted in: Articles, Fluid Handling, Motion Control, Computer software / hardware, Computer software and hardware, Computer software / hardware, Computer software and hardware, Hydraulic and pneumatic hybrid power, Productivity, Hydraulic control
Read More >>

PLCs Improve Control of Radio Broadcasts

PLCs are slowly replacing the outdated hardware and software used at many remote transmitter sites in radio and TV broadcasting applications.

Broadcasting employs the latest technology in many areas, but controlling the broadcast hardware connected to the antenna and the related transmission power, source, and facilities is usually still a low-tech operation. Typically, a broadcast engineer will drive to the unattended transmitter, translator, or repeater site to flip switches and make other manual adjustments (Figure 1).

Posted in: Application Briefs, Electronics & Computers, Software, Antennas, Electric cables, Radio equipment, Antennas, Electric cables, Radio equipment, Reliability, Reliability
Read More >>

PRINTED ELECTRONICS: THE FUTURE IS FLEXIBLE

Chances are that most of us have used a printed electronic device, whether it's a security tag on a piece of clothing, or a plastic badge used to open the door of our workplace. Printable electronics have diverse potential applications in flexible solar cells, batteries, sensors, lighting products, medical diagnostic devices, drug delivery devices, smart packaging and clothing, and displays. Following are several innovative applications incorporating printable electronics.

Low-Cost Printable Electronics Fabrication

The need for low-cost and environmentally friendly processes for fabricating printable electronics and biosensor chips is rapidly growing. NASA has developed a unique approach for an atmospheric pressure plasma-based process for fabricating printable electronics and functional coatings. This system involves aerosol-assisted, room-temperature printing in which an aerosol carrying the desired material for deposition is introduced into a cold plasma jet operated at atmospheric pressure.

Posted in: Articles, Electronics, Electronics & Computers, Electronic equipment, Sensors and actuators, Electronic equipment, Sensors and actuators, Additive manufacturing, Magnetic materials, Nanomaterials
Read More >>

Laser Vision Helps Package Shippers See Clearly

An analyzer developed for Hubble mirror testing helps FedEx scan packages.

For more than 25 years, the Hubble Space Telescope has provided stunning photos of the universe unequalled in their depth, detail, and distinction. But in its early days, Hubble wasn't capable of sending back such breathtaking photos. Within weeks of launch, the images beamed back to Earth were fuzzy and out of focus. It was determined that Hubble's primary mirror had been ground to the wrong shape and was too flat by 2.2 micrometers, causing reflected light from the edge of the mirror to be focused on a different point than light coming from near the center. It was determined that the device used to create the nonspherical mirror had been incorrectly assembled, and the mirror's manufacturer had failed to notice the problem before Hubble was launched.

Posted in: Articles, Imaging, Imaging, Imaging and visualization, Lasers, Optics, Imaging, Imaging and visualization, Lasers, Optics, Logistics
Read More >>

Farzin Amzajerdian, Principal Investigator, Langley Research Center, Hampton, VA

Since 2003, Farzin Amzajerdian has worked on the Navigation Doppler Lidar (NDL), a sensor designed to support safe and precise vehicle landings on Mars and other destinations. The breadbox-sized NDL contains three lasers, a small electronics box, and lenses connected by fiber-optic cables. Amzajerdian will soon oversee the testing of the technology in California's Mojave Desert.

Posted in: Who's Who, Sensors
Read More >>

The Basics of Encoder Selection

Positioning: Resolution and Accuracy

An application’s required positioning resolution dictates the choice of encoder resolution. A well-tuned system can maintain the position within one encoder state (quadcount). Therefore, the encoder resolution in quadcounts (states) should at least correspond to the maximum permissible positioning error. Depending on the response time of the system, a higher encoder resolution should be chosen for the controller to detect deviations faster and counteract quicker.

Posted in: Articles, Motion Control, Calibration, Navigation and guidance systems, Navigation and guidance systems, Reliability, Reliability
Read More >>

Branimir Blagojevic, Technologist, Goddard Space Flight Center, Greenbelt, MD

During his time with former employer Science and Engineering Services, LLC, Branimir Blagojevic helped build a remote-sensing device that detected biological agents. The technology, originally made for the Department of Defense (DoD), may soon find a place on Mars. Blagojevic currently leads the development of the Bio-Indicator Lidar Instrument (BILI), a device that could be used to spot organic molecules and signs of life on Mars.

Posted in: Who's Who, Detectors
Read More >>

The U.S. Government does not endorse any commercial product, process, or activity identified on this web site.