Thomas R. Ebeling

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Several commercially available spirometers use unheated ceramic elements as flow sensors to determine flow and calculate volume of air. The usual method of correcting the resulting flow and volume values to body temperature pressure saturated (BTPS) is to apply a constant factor approximately equal to 30 percent of the full BTPS correction factor. To(More)
A circuit to generate periodically a series of rectangular pulses, or ‘train’, for biological stimulation is described. Analogue integrators are used to determine pulse duration, spacing, and train length from 0·05 to 5000 ms. The 0·10 V output may be used directly or to adapt conventional stimulators for train production. General-purpose integrated-circuit(More)
A convertor to adapt general-purpose or obsolete oscilloscopes for biopotential measurements has been designed. This device consists of complete vertical and horizontal circuits to drive directly cathode-ray-tube delection plates. Vertical sensitivity ranges from 0·1 to 10 mV/cm and sweep speeds from 0·5 s/cm to 0·1 ms/cm. The linear-sweep sawtooth waveform(More)
Pulmonary waveform generators consisting of motor-driven piston pumps are frequently used to test respiratory-function equipment such as spirometers and peak expiratory flow (PEF) meters. Gas compression within these generators can produce significant distortion of the output flow-time profile. A nonlinear model of the generator was developed along with a(More)
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