The article describes an application one of the most sensitive optoelectronic method – Cavity Enhanced Absorption
Spectroscopy in investigation of nitric oxide in exhaled breath. Measurement of nitric oxide concentration in exhaled
breath is a quantitative, non-invasive, simple, and safe method of respiratory inflammation and asthma diagnosis. For
detection of nitric oxide by developed optoelectronic sensor the vibronic molecular transitions were used. The
wavelength ranges of these transitions are situated in the infrared spectral region. A setup consists of the optoelectronic
nitric oxide sensor integrated with sampling and sample conditioning unit. The constructed detection system provides to
measure nitric oxide in a sample of 0-97% relative humidity.
The article describes an application of cavity enhanced absorption spectroscopy for nitric oxide and nitrous oxide
detection. Both oxides are important greenhouse gases that are of large influence on environment, living organisms and
human health. These compounds are also biomarkers of some human diseases. They determine the level of acid rain, and
can be used for characterization of specific explosive materials. Therefore the sensitive detectors of these gases are of
great importance for many applications: from routine air monitoring in industrial and intensive traffic areas, to detection
of explosives in airports, finally for medicine investigation, for health care, etc.
Our compact detection system provides opportunity for simultaneous measure of both NO and N2O concentration at ppb
level. Its sensitivity is comparable with sensitivities of instruments based on other methods, e.g. gas chromatography or
The paper presents a model of a free space optical transmitter operating in the wavelength range of 8-12 μm. In the
transmitter, a quantum cascade laser controlled by a special driver was applied. The driver provides the control of the
energy, repetition rate and duration of radiation pulses. In the described transmitter, generation of pulses with high duty
cycle is also provided, making it possible to use the data link with either RZ or NRZ coding. In the frame of the study,
the impact of laser working conditions on the data link operation was determined.