Special Coverage

Home

Measurement of Cryogenic Fluid Level with Laser Propagation and Surface Floor Reflection

The current float sensing system can be augmented with this new development. Stennis Space Center, Mississippi The risks associated with introducing new hardware and methods into an operational environment have in part prohibited cryogen level measurement technology from advancing. In prior art, measurements have been made with invasive probes immersed in the cryogenic fluid. Implementing this approach would require physical retrofitting, as well as requiring the measuring instrument to make contact with the harsh cryogen fluid environment. However, an externally mounted optical measurement system would mitigate these concerns. Therefore, an optical approach was developed that uses and augments existing validated technology in a manner that does not interfere with the current infrastructure.

Posted in: Physical Sciences, Test & Measurement, Briefs

Read More >>

Video Acuity Measurement System

The smallest letters that can be automatically identified are used to rate the video system. Ames Research Center, Moffett Field, California There is a widely acknowledged need for metrics to quantify the performance of video systems. Existing metrics are either difficult to measure or are largely theoretical. They do not reflect the full range of effects to which video may be subject, or do not relate easily to video performance in real-world tasks. The empirical Video Acuity metric is simple to measure and relates directly to task performance. Video acuity is determined by the smallest letters that can be automatically identified using a video system. It is expressed most conveniently in letters per degree of visual angle.

Posted in: Physical Sciences, Test & Measurement, Briefs

Read More >>

Heat-Flow Probe Design and Development

Applications include measuring heat flow on Earth, where optimal thermal isolation of heaters/temperature sensors is important. Marshall Space Flight Center, Alabama The lunar regolith exhibits extremely low conductivity. Penetrating the regolith presents problems if the geo-technical properties of the regolith are not well understood and accounted for.

Posted in: Physical Sciences, Test & Measurement, Briefs

Read More >>

Dust Removal from Solar Cells

This system is easily integrated with current solar cell panel designs. John H. Glenn Research Center, Cleveland, Ohio Photovoltaic cell arrays are used on robotic rovers on the Mars surface, but dust accumulation on the surface of the solar cells reduces their exposure to light radiation and thus degrades their performance. Dust that accumulates without being removed limits the life of the rover’s power systems. Similarly, terrestrial solar arrays suffer from dust accumulation, especially when located in desert areas, which reduces their effectiveness. Technologies for re moval of the dust or preventing it from settling have been proposed and are being researched, but none were yet implemented on the rovers. These techniques include mechanical means, blowing stored gas, blowing pumped gas, electrically charging the surface, repelling the dust, and other techniques.

Posted in: Electronics & Computers, Briefs

Read More >>

Minimally Obstructed Communication via Acoustic Modems in Fluid-Filled Pipes

This technology can be used in the oil industry, as well as in various underwater operations. NASA’s Jet Propulsion Laboratory, Pasadena, California An acoustic modem that uses a separate phased-array transmitter and receiver has been conceived that allows the communication of high-frequency acoustic waves sideways to the transducer along the fluid-filled pipe. The transducer allows directing waves between the transmitter and the receiver with potentially minimal interferences with the piping walls. In addition, another method of directly sending communication signals up- and down-hole has been conceived that uses angled piezoelectric ring transducers.

Posted in: Electronics & Computers, Briefs

Read More >>

Biofeedback System for Optimal Athletic Performance

Langley Research Center, Hampton, Virginia ZONE (Zeroing Out Negative Effects) is a method of biofeedback training for optimal athletic performance. ZONE is designed to improve athletes’ responses to stress, anxiety, and loss of concentration during competition. In the training environment, when the user successfully attains an optimal target state of psychophysiological functioning, the technology informs and/or rewards the user through real-time physical changes in the athletic equipment. For example, in the training setting, a golfer can work toward optimal concentration in the act of putting, leading to improved performance in real situations.

Posted in: Electronics & Computers, Briefs

Read More >>

Methods for Clock and Reset Synchronization in a CMOS Integrated Circuit

These methods ensure fault-free operation in high-integrity systems. Lyndon B. Johnson Space Center, Houston, Texas In high-integrity systems, a method of assuring integrity called a self-checking pair is employed. A self-checking pair is a logical grouping of two of the same devices performing the same operation and cross-checking each other to ensure correct operation. In this manner, a single fault on one will be detected by its partner, and the appropriate action can be taken to both recover the fault and ensure the fault does not propagate.

Posted in: Electronics & Computers, Briefs

Read More >>