Designing drift-free and reliable NDIR gas sensors using modulated infrared sources

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Source: Axetris Ag

Axetris IR sources are based on the proprietary thin film technology from Axetris, and deliver exceptional performance when electrically modulated in the 5-100 Hz range. This feature can help NDIR gas sensor designers achieve drift-free operation, combined with increased reliability and lifetime. Here we present qualitative conclusions (see table) based on multiple years of internal performance testing.

Correcting baseline drift and achieving quicker warm-up time

A modulated IR source, such as the EMIRS200 or EMIRS50 from Axetris, achieves and maintains a stable state – defined by a certain max-min variation - more quickly when compared with a similar IR source driven in DC mode. Thanks to the proprietary thin film technology from Axetris - which enables a very quick response time of the emitting membrane - the Axetris IR source achieves very high modulation depths even at high modulation frequencies (5-100 Hz). Combined with advances in infrared detector technology (typically used detector types: pyroelectric or photodetectors), which offer ever-quicker detector response times, this feature can be used to design NDIR gas sensors with quicker warm-up time and drift-free operation.

Increased Reliability and Lifetime

Axetris IR sources are based on a highly stable and reliable black platinum emitting membrane, offering extremely long lifetimes (>10 years MTTF when driven in recommended limits). In addition, modulated drive modes further increase the reliability and lifetime of the IR source by decreasing effective “on-time”, whereby the ageing process is decelerated.

Read more about Axetris IR sources for NDIR gas detection and monitoring applications.

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