Phonocardiograph transducer Patent
Piezoelectric transducer for monitoring sound waves of physiological origin
Young, W. J.↗
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Results for “Transducers”
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Self-calibrating displacement transducer Patent
Development and characteristics of self- calibrating displacement transducer for measuring magnitude and frequency of displacement of bodies
Mckinney, R. L.↗
Pressure transducer calibrator Patent
Combination pressure transducer-calibrator assembly for measuring fluid
Bogusz, F. J.↗
Pressure sensitive transducers Patent
Miniature electromechanical junction transducer operating on piezojunction effect and utilizing epoxy for stress coupling component
Garfein, A.↗
A digital pressure transducer
Specifications and performance tests for digital pressure transducers designed for spacecraft application
Harman, H. S.↗
A two-wire IC compatible capacitive transducer circuit
Two-wire IC pressure transducer bridge circuit performance features based on circuit analysis
Harrison, D. R.↗
A bleed-type pressure transducer for in-stream measurement of static pressure fluctuations
Turbulent incompressible air flow in-stream static pressure fluctuations measurement, describing bleed type pressure transducer theory, design and operational characteristics
Jones, B. G.↗
Neuroendocrine transducer cells in mammals
Mammalian neurons, neuroendocrine transducer /pinealocytes and adrenomedullary chromaffin/ and endocrine cells communication properties, noting signal transmission
Wurtman, R. J.↗
Piezoelectric transducer mosaic
Crystal substrate is used to form a transducer mosaic by employing single X-cut crystal and transferring desired pattern from stainless steel mask. Result is a less tedious and costly method of producing a mosaic of matched crystals having the same fundamental frequency.
Haborak, R. C.↗
A sonic transducer to detect fluid leaks
Ultrasonic detector utilizes set of contact transducers and bandpass filters to detect and analyze sonic energy produced by flow or leakage. Detector covers wide frequency range and is operable at cryogenic temperatures and in vacuum.
Cimerman, I.↗
Amplifier for signal from thin film transducer
Electronic circuitry is devised to raise low level signal from platinum film type transducer to sufficient amplitude to trigger oscilloscope or time interval counter. Circuit can be used wherever it is necessary to raise level of low amplitude, low impedance positive polarity pulse source to a 5 or 6 volt level.
Jensen, K. A.↗
Spark ultrasonic transducer
Nondestructive testing by spark transducer induces ultrasonic pulses in materials without physical contact. High power pulse generator connected to step up transformer produces sparking between two tungsten rods and ultrasonic energy pulses in test samples placed between rods.
Hoop, J. M.↗
Diode-quad bridge for reactive transducers and FM discriminators
Diode-quad bridge circuit was developed for use with pressure-sensitive capacitive transducers, liquid-level measuring devices, proximity deflection sensors, and inductive displacement sensors. It may also be used as FM discriminator and as universal impedance bridge.
Harrison, D. R.↗
Improvement of a large-amplitude sinusoidal pressure generator for dynamic calibration of pressure transducers
Results of research on the improvement of a sinusoidal pressure generator are presented. The generator is an inlet-area-modulated, gas-flow-through device (siren type) which was developed to dynamically calibrate pressure transducers and pressure probes. Tests were performed over a frequency range of 100 Hz to 20 kHz at average chamber pressures (bias pressure) between 30 and 50 psia (21 and 35 N/sq cm abs) and between 150 and 300 psia (104 and 207 N/sq cm abs). Significant improvements in oscillation pressure waveform were obtained but with reduction in available generator oscillation pressure amplitude range. Oscillation pressure amplitude, waveform, and waveform spectral content are given as functions of frequency for the two bias pressure conditions. The generator and instrumentation for frequency, amplitude, and spectrum measurements are described.
Robinson, R. E.↗
Capacitive transducers
The theory, applications, and possible structural designs of capacitive transducers are presented. Emphasis is placed on the circuits used in connection with the sensors, such as AM, FM, resonant circuits, mode circuits, direct current circuits, and special circuits. Some criteria for selection of a design or the purchase of a commercial device are given.
Lucifredi, A. L.↗
Acoustic-wave detection via a piezoelectric field-effect transducer.
An oriented piezoelectric film has been incorporated in the insulator region of a silicon insulated-gate field-effect transistor to provide a sensitive high-frequency strain transducer. With this device, strains as low as 10 to the -8th power have been detected, and gauge factors of roughly 7000 have been attained for applied ac strains at 5.6 MHz.
Greeneich, E. W.↗
Signal conditioner for potentiometer type transducers
Low cost method is described for signal conditioning of pot-type transducers utilizing printed circuitry. Conditioner fits into standard rack, accommodates 56 channels, and can be operated by one attendant.
Armentrout, E. C.↗
An economical arterial-pulse-wave transducer
Transducer records arterial pulses externally. Device uses thin plastic membrane which is fluid coupled to pressure sensitive transistor. Transistor is connected to amplifier which, in turn, is connected to recorder. End section is threaded to accept suitable holder and contains pressure relief vent allowing transistor to sense only pressure levels greater than atmospheric.
Kim, C.↗