Special Coverage

Home

LED Transmitters

OPTEK Technology (Carrollton, TX) offers the OPF670 series of fiber optic LED transmitters for integration into data communications equipment. The series consists of the OPF670 in a TO-46 package, the OPF672 in a standard profile metal housing, and the OPF673 in a low-profile metal housing. The units launch optical power into 50/125 μmor 62.5/125 μm-diameter multimode fibers and are thermally stable. The OPF670 unit is designed for active alignment into a connector receptacle in a TO-46 package with a plastic lens cap. The 672 and 673 models are equipped with an ST connector.

Posted in: Products, Products

Read More >>

Non-Circular Optical Fibers

Liekki (Lohja, Finland) has released square and rectangular optical fibers for high-power delivery applications. Square- and rectangular-shaped fibers more closely match optical sources. Different combinations — rectangular core-round cladding or rectangular core-rectangular cladding — are available. The fibers exhibit low photodarkening, flat refractive index profile, and reduced nonlinear effects.

Posted in: Products, Products

Read More >>

Tunable Light Source

The TLS Series of software-controlled (Windows®) wavelength tunable light sources from Optometrics Corp. (Ayer, MA) can be used for detector sensitivity testing, color matching, and characterization, as well as reflectivity and absorption of different materials. Featuring a USB interface, abilities include wavelength selection from 360 to 1,000 nm and scanning between wavelengths. Bandpass output ranges from 6, 10, and 25 nm, and to illuminate specific wavelengths, a stepper motor is integrated. Manual versions also are offered.

Posted in: Products, Products

Read More >>

Aerostructures Test Wing

Test data can be used to refine predictions of the onset of flutter. The Aerostructures Test Wing (ATW) was an apparatus used in a flight experiment during a program of research on aeroelastic instabilities. The ATW experiment was performed to study a specific instability known as flutter. Flutter is a destructive phenomenon caused by adverse coupling of structural dynamics and aerodynamics. The process of determining a flight envelope within which an aircraft will not experience flutter, known as flight flutter testing, is very dangerous and expensive because predictions of the instability are often unreliable.

Posted in: Briefs

Read More >>

Flight-Test Evaluation of Flutter-Prediction Methods

Experiments have demonstrated the accuracy of predictions of instability. The flight-test community routinely spends considerable time and money to determine a range of flight conditions, called a flight envelope, within which an aircraft is safe to fly. The cost of determining a flight envelope could be greatly reduced if there were a method of safely and accurately predicting the speed associated with the onset of an instability called flutter.

Posted in: Briefs, TSP

Read More >>

Innovative, High-Pressure, Cryogenic Control Valve: Short Face-to-Face, Reduced Cost

This design includes several improvements over prior designs. A control valve that can throttle high-pressure cryogenic fluid embodies several design features that distinguish it over conventional valves designed for similar applications. Field and design engineers worked together to create a valve that would simplify installation, trim changes, and maintenance, thus reducing overall cost. The seals and plug stem packing were designed to perform optimally in cryogenic temperature ranges. Unlike conventional high-pressure cryogenic valves, the trim size can be changed independent of the body.

Posted in: Mechanics, Briefs

Read More >>

From Planetary Imaging to Enzyme Screening

To work in NASA’s Mission Control Center and share in the excitement of seeing the very first close-up images of Saturn being piped back to Earth (from the Pioneer 11 spacecraft in 1979) is not a sensation that most high school students get to experience. However, as part of an internship in NASA’s Space Biology Program , Mary M. Yang had the opportunity to do just that.

Posted in:

Read More >>