Download or read book Review of Progress Towards Developing a Sensor for the Measurement of CO2 in Hyperbaric Gaseous Environments written by Kevin G. Williams and published by . This book was released on 1975 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: The development of a small, accurate and reliable alarm sensor to monitor the partial pressure of CO2 (pCO2) in the hyperbaric gaseous environment of the saturation diver is required to prevent his exposure to dangerous levels of CO2. Andros Incorporated has developed a novel, nondispersive infrared (NDIR) 'density modulation' technique meeting all the previously mentioned requirements. Using the technique, the number of CO2 molecules in the radiation path is varied periodically by subjecting a sample of the gas to a known density modulation and then measuring the fractional change in transmitted infrared radiation. Response and design are discussed.