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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Infrared photographic pyrometry method measures and maps the temperature distribution on a heated surface with accuracy and precision. This method involves the collection, detection and measurement of a narrow bandwidth of emitted infrared radiation. Standard commercially-available equipment is used, together with systematic procedures.
Sweep detector or passive spectrum analyzer provides a positive monitoring of the bandwidth of the input amplifier of a tracking receiver. Used with an oscilloscope, it provides a visual display of a microwave amplifier bandpass.
Variable power divider keeps microwave transmitter at full power. This preserves the bandwidth and modulation characteristics and proportions any amount of the full power from the normal antenna into a dissipative load.
Rectangular cup antenna withstands indirect impacts up to 10,000g and direct impacts up to 250 ft/sec of impact velocity and provides radiation of selected polarization and beam shape. It has high radiating efficiency, and relatively broad bandwidth.
Bandwidth tests for ranging and position fixing by ATS-1 and ATS-3
Rocket-borne spectroheliograph for monochromatic solar photography in Mg II 2802.7 A line noting filter bandwidth, film polarizers and temperature control
Filtering optimization prior to limiting digital signals in strong noise, detailing bandwidth choice of single pole low pass filter
EHF earth-satellite link communication channel emphasizing down link, discussing weather models, atmospheric absorption and temperature, channel coherence bandwidth, etc
Communications system maintains phase lock of weak telemetry signals with a minimal expenditure of power and bandwidth. An estimate of the frequency variation as a function of time is used to achieve coherent phase demodulation.
Electronic instrument automatically monitors the stages of sleep of a human subject. The analyzer provides a series of discrete voltage steps with each step corresponding to a clinical assessment of level of consciousness. It is based on the operation of an EEG and requires very little telemetry bandwidth or time.
Physical and temporal aspects of sound which influence the rating of subjective noisiness are intensity, spectrum shape and bandwidth, spectral complexity, and duration. Objective rating methods include a graphic method, full octave and one-third octave methods, and methods that measure one value over all frequencies.
Self-tuning filter automatically adjusts its center frequency to track signal frequency. This permits the use of a filter with a bandwidth smaller than the range of input signal frequencies.
Circuit, placed in the signal path of a closed-loop receiver to modulate telemetered data in the 10-MHz spectrum, improves signal-to-noise ratio by 3 db in a communication receiver. The switch enables bandwidth reduction which reduces noise overload on the following stages, giving the system greater dynamic range.
Autocorrelation functions, power spectral density, bandwidth, and bit synchronization efficiency for PCM code formats
Minimum pointing error of large aperture space telescopes as function of diameter, servo bandwidth, and star brightness
Pumping laser bandwidth requirement for optical parametric oscillators
Pioneer 6 radio signal spectrograms during solar occultation, noting solar event effects on bandwidth
Narrow bandwidth FM signal distortion during multiplication in lossless varactor multiplier calculated, using equivalent circuit of frequency doubler