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Chapter 1: Technology Overview
The following chapter contains general descriptions about the technology used by Masimo
products.
NomoLine ISA CO2 Technology Overview
NomoLine capnography computes and analyzes the parameters based on the samples
gathered from the patient's breathing circuit, via the NomoLine sampling line.
The heart of the NomoLine capnography system is the solid state, dual-channel spectrometer
which uses a proprietary infrared radiation source to transmit light through the gas sample.
Before reaching the gas sample, the light path is intersected by a narrow band optical filter
that only allow light corresponding to the selected wavelength peak of CO
other end of the light path, a sensor detects the portion of the light that is not absorbed by
the gas. The amplitude of the detector output is an inverse function of the gas concentration.
Thus, at a concentration of zero, the amplitude is at its maximum.
Basic Infrared Spectrometer
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to pass. At the
2
1. Emitter
2. Measurement
Chamber
3. Optical Filter
4. Detector
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NomoLine ISA CO2
The selection of the optical filter within the spectrometer is crucial to the characteristics and
performance of the gas analyzer. The NomoLine capnography system spectrometer uses the
strong absorption peak at 4.2 μm for CO
measurement. In addition to the measurement
2
filter, a second optical filter appropriately located within the infrared spectrum is used as
reference.
Infrared absorption spectrum for common respiratory gases
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Chapter 1: Technology Overview
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