Gas Sensing Technology

Novlead chose two technical paths, electrochemical method and non-spectroscopic infrared method, to create a more accurate gas sensing technology system.

The main advantages of electrochemical gas sensing technology:

• Low range accuracy
Exhaled breath testing requires measurement of low ppb levels of nitric oxide as the basis for clinical diagnosis. Through zero-drift compensation technology and low-noise signal conditioning technology, the low-frequency and high-frequency noise of the gas sensor in the low-range range can be effectively reduced, and the detection limit is significantly improved.

• Avoiding distractions
The semi-permeable membrane effectively prevents interfering gases such as acetone, ammonia and ethanol from entering the sensor; the built-in humidity balance pipeline, temperature and humidity pressure sensor and special design algorithm can effectively compensate for environmental effects such as temperature, relative humidity and altitude.

• Service life
Committee on Gas Detection and Environmental Monitoring (CoGDEM) states that there are three key factors affecting the service life of electrochemical sensors: catalyst degradation, electrolyte leakage, and electrolyte evaporation. Liquid electrolytes are easy to dry or evaporate in dry and high temperature environments, and the anti-water loss treatment ensures long-term stability of the sensor.

The main advantages of non-spectroscopic infrared gas sensing technology:

• High responding speed
The non-spectroscopic infrared gas sensing technology is suitable for monitoring and real-time control of the output concentration of the gas instant generation system. With the help of MEMS semiconductor infrared light source and optimized gas chamber design and thermoelectric management technology, higher signal response speed can be achieved.

• Boost of gain
The common infrared absorption peak of NO is relatively weak, and the challenge is that the optical path needs to be extended enough to ensure sufficient gain. Appropriate pressure regulation and surface treatment of the inner wall of the gas chamber can enable the use of shorter optical paths, reduce system volume and significantly increase gain.

• Two-way technology
The non-split infrared gas sensor includes a measurement channel and a reference channel, which can dynamically compensate for the effects of environmental variables and device aging.

The technology

Reslink uses Novlead's new generation of electrochemical sensor NO detection system, which becomes a NO detection system with high accuracy, more convenient, and three-in-one detection function for the small airway of mouth and nose ventilation.