Accession Number : ADA302219

Title :   Develop a Diode Laser Spectroscopy System for Continuous Monitoring of Certain Gases in the Expire Air and Blood with a High Degree of Accuracy.

Descriptive Note : Final rept. 26 Sep 94-25 Sep 95,

Corporate Author : PRINCETON ELECTRONIC SYSTEMS INC CRANBURY NJ

Personal Author(s) : Zhang, Jiamin

PDF Url : ADA302219

Report Date : OCT 1995

Pagination or Media Count : 19

Abstract : Development of a monitor prototype to accurately measure medical gases such as O2 and CO2 content in the expired air is the objective of this program. By using the frequency modulation spectroscopy technique, we have fabricated a diode laser based sensor prototype for measuring O2 content in different concentration gas mixtures and the expired air. The prototype provides the good detection accuracy and signal-to-noise ratio. For an application purpose of breath-by-breath oxygen content monitoring, the death volume of the gas cell in the current sensor is still big and the related sample replacement time is still relatively long. The single board lock-in amplifier has to be improved. Further modifications on the lock-in amplifier and the gas cell are underway.

Descriptors :   *MONITORING, *SPECTROSCOPY, *GASES, *OXYGEN, *NITROGEN OXIDES, *CARBON DIOXIDE, *CONTINUOUS PROCESSING, *BLOOD, *DIODE LASERS, MEASUREMENT, DETECTION, DETECTORS, HIGH RATE, FREQUENCY MODULATION, SIGNAL TO NOISE RATIO, ACCURACY, SEMICONDUCTOR LASERS, SEMICONDUCTOR DIODES, MEDICINE, REPLACEMENT, PHYSIOLOGY, DEATH, GAS CELLS, AMPLIFIERS.

Subject Categories : Medicine and Medical Research
      Biochemistry
      Lasers and Masers
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE