Space related biological and instrumentation studies Annual report, Mar. 1970 - Mar. 1971
Pressure sensors, blood flow transducers, pH electrodes, and photographic recording of biological data for use in aerospace medicine
Gibson, R. J.↗
SEARCH · Engineering Papers
Results for “Transducers”
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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An evaluation of solid state phenomena and devices for sensor applications Final report
Solid state bulk and semiconductor junction phenomena evaluated for advanced NASA sensors and transducers
Hauser, J. R.↗
Sinusoidal pressure genrator for testing pressure probes
Sinusoidal pressure generator for determining frequency response of small pressure transducers, pressure probes and characteristics of small diameter infinite lines
Nyland, T. W.↗
On the measurement of stress in solid propellant
Solid propellants stress measurement using piezoresistive transducer
Duran, E. N.↗
An electrical-to-fluidic signal converter using heated curved walls
Electro-pneumatic transducer for conversion of electrical into fluidic signals, using temperature dependence of laminar gas jet deflection angle in flow along heated curved wall
Rehsteiner, F. H.↗
Etching of metallographic specimens by cavitation
Cavitation damage in water to unalloyed metals and Ni superalloy, using ultrasonic vibratory testing with magnetostrictive transducer
Young, S. G.↗
Wide-range dynamic pressure sensor
Transducer measures pressure by sensing the damping of a vibrating diaphragm immersed in the atmosphere to be measured. Improved sensor can be included in rugged, lightweight package for use aboard aircraft, meteorological vehicles, and space probes.
Dimeff, J.↗
Continuous monitor for gas ratios in a mixture
Fluidic oscillator, incorporating piezoelectric transducer to sense molecular weight of gas mixture, is used to continuously monitor ratio of a mixture of two gases in a flowing system. Device is lightweight, compact, reliable, easy to install, and also produces a simple output signal for controller. Frequency of oscillation is measured and signal converted to ac output.
Gorland, S. H.↗
Low frequency sinusoidal pressure generator
Low frequency pressure generator is built to provide sinusoidal driving function in frequency range from 0.05 to 50 Hz for frequency response testing of pressure transducers used in liquid-filled systems. Generator consists of piston-in-cylinder, scotch-yoke mechanism machined into piston, and adjustable eccentric.
Curreri, J. S.↗
Sensor capsule for diagnosis of gastric disorders
Motility and pH sensor capsule is developed to monitor gastric acidity, pressure, and temperature. Capsule does not interfere with digestion. Sensor is capsule which includes pH electrode, Pitran pressure transducer, and thermistor temperature sensor all potted in epoxy and enclosed in high density polyethylene sheath.
Holen, J. T.↗
A compact battery powered digital thermometer
Development of thermometer to provide quick and accurate temperature readings using thermal resistance probe as temperature-to-resistance transducer is discussed. Details of construction and operations are described. Illustration of circuit and components is provided.
Zivley, G.↗
Improved ultrasonic biomedical measuring apparatus
Device for making measurements of organs in living specimens and recording movements of organs is described. System uses series of ultrasonic pulses beamed into body of animal and reflected echo pulses are picked up by transducers and recorded. Diagram of equipment required and method of application is included.
Lee, R. D.↗
Flight instrument and telemetry response and its inversion
Mathematical models of rate gyros, servo accelerometers, pressure transducers, and telemetry systems were derived and their parameters were obtained from laboratory tests. Analog computer simulations were used extensively for verification of the validity for fast and large input signals. An optimal inversion method was derived to reconstruct input signals from noisy output signals and a computer program was prepared.
Weinberger, M. R.↗
Liquid-filled transient pressure measuring systems: A method for determining frequency response
An equation is given and experimentally verified for computing the resonant frequency of liquid-filled transient pressure measuring systems. Resonant frequencies of 100 to 1000 Hz are typical of those systems tested. The effect of noncondensable gas bubbles on system response is described. A method for determining transducer volumetric compliance is presented. An example system is described and analyzed to demonstrate the use of the theory.
Anderson, R. C.↗
An investigation of transient pressure and plasma properties in a pinched plasma column
The transient pinched plasma column generated in a linear Z-pinch was studied experimentally and analytically. The plasma column was investigated experimentally with the following plasma diagnostics: a special rapid response pressure transducer, a magnetic field probe, a voltage probe and discharge luminosity. Axial pressure profiles on the discharge chamber axis were used to identify three characteristic regions of plasma column behavior; they were in temporal sequence: strong axial pressure asymmetry noted early in plasma column lifetime followed by plasma heating in which there is a rapid rise in static pressure and a slight decrease static pressure before plasma column breakup. Plasma column lifetime was approximately 5 microseconds. The axial pressure asymmetry was attributed to nonsimultaneous pinching of the imploding current sheet along the discharge chamber axis. The rapid heating is attributed in part to viscous effects introduced by radial gradients in the axial streaming velocity. Turbulent heating arising from discharge current excitation of the ion acoustic wave instability is also considered a possible heating mechanism.
Stover, E. K.↗
A borehole jack for deformability, strength, and stress measurements in a 2-inch borehole
A borehole jack devised for lunar exploration is described and results of its use in simulated lunar solids are presented. A hydraulic cylinder mounted between two stiff plates acts to spread the plates apart against the borehole walls when pressured. The spreading is measured by a displacement transducer and the load is measured hydraulically. The main improvement over previous instruments is the increased stroke, which allows large deformations of the borehole. Twenty-eight pistons are used to obtain a high hydraulic efficiency, and three return pistons are also provided. Pressure-deformation curves were obtained for each test on Lunar Soil Simulant No. 2, a light gray silty basalt powder.
Goodman, R. E.↗
Testing methods and techniques: Environmental testing: A compilation
Various devices and techniques are described for testing hardware and components in four special environments: low temperature, high temperature, high pressure, and vibration. Items ranging from an automatic calibrator for pressure transducers to a fixture for testing the susceptibility of materials to ignition by electric spark are included.
Source record↗
Automatic control of liquid cooling garment by cutaneous and external auditory meatus temperatures
An automatic control apparatus for a liquid cooling garment is described that is responsive to actual physiological needs during work and rest periods of a man clothed in the liquid cooling garment. Four skin temperature readings and a reading taken at the external portion of the auditory meatus are added and used in the control signal for a temperature control valve regulating inlet water temperature for the liquid cooling garment. The control apparatus comprises electronic circuits to which the temperatures are applied as control signals and an electro-pneumatic transducer attached to the control valve.
Fulcher, C. W. G.↗