Moisture infrared sensor for medical applications

Eric Monacelli; Yasser Alayli; Frederic Lofaso

doi:10.1117/12.500126

18 April 2003 Moisture infrared sensor for medical applications

Eric Monacelli, Yasser Alayli, Frederic Lofaso

Proceedings Volume 5119, Bioengineered and Bioinspired Systems; (2003) https://doi.org/10.1117/12.500126
Event: Microtechnologies for the New Millennium 2003, 2003, Maspalomas, Gran Canaria, Canary Islands, Spain

Abstract

The importance of delivering warm, humidified air to patients ventilated through an endotracheal or tracheostomy tube is widely accepted. The use of modern artificial noses or heat and moisture exchangers made of recently developed material could be a solution to both problems of humidification and heat preservation. For this investigation, an IR optical sensor to measure weak partial pressure of water vapor has been designed and realized. This sensor is based on direct molecular absorption in the near IR corresponding to fundamental mode v₁ and it is an extrinsic and amplitude modulation type. In the quasi-linear region between 0 to 30 mbars, the calibration curve that represents the transmited power versus the water vapor partial pressure in air shows a high sensitivity with a minimum detectable of 100 μbars. The experimental setup, test procedure, theory analysis, and data processing of the optical water vapor sensor will be described in this article. The sensor has been designed to monitor water vapor in the modern artificial noses.

Citation Download Citation

Eric Monacelli, Yasser Alayli, and Frederic Lofaso "Moisture infrared sensor for medical applications", Proc. SPIE 5119, Bioengineered and Bioinspired Systems, (18 April 2003); https://doi.org/10.1117/12.500126

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