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Low Er-Doped Yttrium Gallium Garnet (YGG) as Active Media for Solid-State Lasers at 1651 nm

This technology could serve applications in the bio-medical areas such as nerve stimulation and dentistry. Goddard Space Flight Center, Greenbelt, Maryland The typical approach for producing laser output at the 1651-nm wavelength is via nonlinear frequency conversion. Lasers based on nonlinear conversion are complex, and it is very difficult to provide stability over time and over a wide range of operating temperatures. The efficiency of such optical sources is also low. A much more promising approach is the use of active media that allows for the development of solid-state lasers (SSL) with spectral emission at 1651 nm. An important requirement for this active medium is the ability to support in-band pumping with a low quantum defect since this approach leads to significant improvement in efficiency of SSLs and excellent beam characteristics due to low thermal stress of the active media.

Posted in: Briefs, TSP, Lasers & Laser Systems

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Signal Processing Software for Remote Vital Sign Monitoring

NASA’s Jet Propulsion Laboratory, Pasadena, California This software provides the processing for a non-contact system that remotely estimates the heart rate and respiration rate of individuals as they carry on daily activities, and also enables detection of heart and respiration rate through walls.

Posted in: Briefs, TSP, Electronics & Computers, Patient Monitoring, Data Acquisition

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Detecting High Stress in Oral Interviews and Text Documents

Content of an interview or text is subjected to various levels of statistical analysis to determine if the person knows the truth and is communicating it. Ames Research Center, Moffett Field, California When a person is interviewed, some of the answers may be inaccurate, or even deceptive, because the person may have either incomplete information, is telling only part of the truth, or is fabricating a false answer, or a combination of all three. When the person is habitually making statements that are known to be false, or only partly true, emotional and/or intellectual conflicts often arise within them, and these conflicts may become manifest by inconsistencies in use of different parts of speech or in logical relationships between statements. These inconsistencies are more subtle than inconsistencies in factual statements, and identification of these inconsistencies is more difficult and less straightforward than identification of factual inconsistencies.

Posted in: Briefs, TSP, Electronics & Computers, Data Acquisition

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Predicting Heart Age Using Electrocardiography

Lyndon B. Johnson Space Center, Houston, Texas Knowledge of a patient’s cardiac age, or “heart age,” could prove useful to both patients and physicians for encouraging lifestyle changes that are potentially beneficial for cardiovascular health. This may be particularly true for patients who exhibit symptoms, but who test negative for cardiac pathology.

Posted in: Briefs, TSP, Electronics & Computers, Data Acquisition

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Prediction of Visual Acuity from Wavefront Aberrations

This automated vision test is accurate, simple, and fast. Ames Research Center, Moffett Field, California Visual acuity (clearness of vision) usually is measured by an eye doctor using an eye chart. It measures the smallest letters that can be reliably identified by the patient at a specified distance. The traditional test requires the patient to look and report which letters they see.

Posted in: Briefs, TSP

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Mobility Augmentation System Using Switchable Spring Mechanisms

This system could be used by disabled persons and individuals in rehabilitation who require prosthetics. NASA’s Jet Propulsion Laboratory, Pasadena, California The disclosed device provides key elements to enabling compact exercise machines that overcome many of the disadvantages of the current spacesuit, as well as medical prosthetics and exoskeletons. The mechanism is based on switchable, curved, leaf, and torsion spring mechanisms that support the user joints and at the contact with the ground to enable high-speed, low-loss locomotion. The springs are primed with an actuator to counteract losses and recycle the user’s elastic energy in the locomotion. The mechanism is designed to be switchable and to allow for removing the springs from the structure for fine control. Adjustable hard-stops are embedded into each joint to prevent overextension and optimize the performance at each gait. The spring mechanisms are made from carbon fiber composites to reduce the weight of the system. The components of this mechanism can be structurally connected to each other via a mechanical clutch to form a symmetric lower-extremity system with a passive spring mechanism to reduce the requirement of the joints to dampen the impact forces and recycle some of the energy of walking and running.

Posted in: Briefs, TSP

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Visual Image Sensor Organ Replacement

This innovation is a system that augments human vision through a technique called “Sensing Super-position” using a Visual Instrument Sensory Organ Replacement (VISOR) device. The VISOR device translates visual and other sensors (i.e., thermal) into sounds to enable very difficult sensing tasks.

Posted in: Briefs, TSP

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