Abstract:
A reproducing system for use as a high speed magnetic tape scanning instrument to provide for the superimposing of recurring signals such as ECG complexes on a visual indicator such as an oscilloscope from signals previously recorded for long time periods by a very slow single-track magnetic tape recorder. Trigger signals are developed from the reproduction by a first playback head of the ECG signals recorded on the tape. The trigger signals are delayed a particular period to provide for control signals to control the activation of the oscilloscope sweep at the proper times to produce a stable superimposition of the ECG signals as reproduced by a second playback head spaced from the first playback head. The particular period of delay is provided electronically or electromechanically.
Abstract:
A respiratory gas analyzer is provided in the form of a breath gas measuring instrument and system in which the oxygen uptake in the expired air of a subject, and the oxygen consumption per unit of weight of the subject, are periodically calculated and digitally displayed. A true sample of the expired air is accumulated by gradual extraction within the system of the invention on a periodic basis for gas analysis, and a computer included in the system calculates the oxygen depletion of each total sample to standard temperature and at ambient pressure and provides a digital display of oxygen uptake. An additional computer is included in the system which responds to the compensated oxygen depletion and to the subject''s weight to provide a digital display of the oxygen uptake per unit weight of the subject.
Abstract:
A respiratory gas analyzer is provided which measures and then instantly displays the volume of expired air from a subject. The instrument includes a positive displacement flow meter which is enclosed in an oven environment and which is used to measure all air expired from the subject, and this volume, computed at body temperature and ambient pressure, saturated with water vapor (BTPS) is digitally displayed at the end of each minute.
Abstract:
A respiratory gas analyzer is provided in the form of a breath gas measuring instrument and system in which the volume of air expired by a subject, the oxygen uptake in the expired air, and the oxygen consumption per unit of weight of the subject, are periodically calculated and digitally displayed. The instrument and system of the invention measures on a minute-by-minute basis the volume of expired air from the subject, and it provides a digital display of the total volume output of the expired air, compensated to a standard temperature and pressure. A true sample of the expired air is accumulated by gradual extraction within the system on a periodic basis for gas analysis, and a computer included in the system calculates the oxygen depletion of each total sample to standard temperature and pressure and provides a digital display of oxygen uptake. An additional computer is included in the system which responds to the compensated oxygen depletion and to the subject''s weight to provide a digital display of the oxygen uptake per unit weight of the subject.
Abstract:
An electronic measuring system is provided which measures the angular position of a rotatable mirror so as to provide an electrical output signal suitable for activating a digital display, or for introduction into a computer for further processing. The mirror, for example, may be incorporated into a galvanometer, gas analyzer, or other measuring instrument. In the practice of the invention, a moving light spot is directed to the mirror for reflection thereby to a photo-detector assembly. The reflected light spot reaches the photo-detector after a time interval which is dependent upon the angular position of the mirror, so that an electrical output signal representative of the angular position of the mirror may be obtained.