NDIRsim App - The Smart Way to Design and Optimize Infrared Gas Measurements

Imagine being able to design your infrared gas measurement system before you ever enter the lab - to test optical filters, gas concentrations, and path lengths instantly, right from your browser. No worrying about operating systems or software installation. With NDIRsim, that is a reality.

NDIRsim is a new app from Micro-Hybrid that gives engineers, scientists, and educators a faster, smarter way to explore non-dispersive infrared (NDIR) gas measurement. Instead of relying on trial and error, NDIRsim lets you visualize how gases absorb infrared light under real-world conditions - and how your design choices affect signal quality and sensitivity.

NDIRsim eliminates guesswork. By simulating absorption spectra, filter transmission curves, and concentration-dependent absorption, it helps you understand exactly how your sensor will behave. You can test ideas, compare configurations, and refine designs - all without building a single prototype.

At the core of NDIRsim is HITRAN - the High-Resolution Transmission Molecular Absorption Database. HITRAN is the global standard reference for molecular spectroscopic data and provides detailed information on how gases absorb and emit infrared light.

NDIRsim integrates HITRAN data directly into its simulations. When you select a gas, the app retrieves absorption line parameters from HITRAN and calculates the combined absorption spectrum for that gas across your chosen wavelength or wavenumber range. These line-by-line calculations represent real molecular transitions, making the simulated spectra physically accurate and directly comparable to laboratory measurements.

You choose the gas you want to measure, define temperature and pressure conditions, and select a wavelength or wavenumber range. NDIRsim then calculates and plots the absorption spectrum, showing precisely where the strongest absorption bands occur.

Next, you can add optical filter data - including central wavelength (CWL), half bandwidth (HBW), and transmission (Tmax) - to see how well your chosen filter overlaps with the gas absorption peaks. The simulation instantly visualizes whether your filter is a good fit or if adjustments are needed.

Finally, by varying concentration and path length, you can simulate how the absorption changes with different gas levels. The resulting curve shows how your measurement signal will respond, revealing the linear range and sensitivity limits of your setup.

In just a few clicks, you can explore design choices that would normally take days of lab time to test.

NDIRsim was designed with both industry and academia in mind.

For engineers and R&D specialists, it’s a rapid-prototyping environment that helps you optimize performance early in the design process. You can identify the right filters, emitter-detector combinations, and optical path lengths before committing to hardware - saving time, cost, and effort. This approach reduces prototyping cycles and gives you a clearer understanding of system performance - before the first prototype is even built.

For students and educators, NDIRsim turns abstract theory into clear, visual insight. It’s an interactive way to demonstrate how temperature, pressure, and gas concentration shape absorption spectra. Instead of static textbook graphs, users see live simulations that respond to real input values.

NDIRsim is more than just an app - it reflects Micro-Hybrid’s deep expertise in infrared sensing. As a global developer of high-performance IR emitters, detectors, and gas sensor components, Micro-Hybrid has decades of experience helping engineers build reliable, high-precision NDIR systems.

NDIRsim extends that expertise into a digital platform. It gives you the same insight our engineers use when optimizing optical paths and filter combinations for real sensors. It’s practical, physics-based, and designed for meaningful results.

Whether you’re exploring NDIR technology for the first time or optimizing a commercial sensor design, NDIRsim app helps you make better, faster, and more confident decisions. Experience the power of simulation in infrared gas measurement.

And after you start your next project with a clear advantage due to the NDIRsim app, take the next logical step with the Micro-Hybrid eNDIRi² evaluation kit, an all-in-one solution for testing and evaluating the entire range of Micro-Hybrid IR components. The kit supports JSIR340 and JSIR350 series IR emitters, thermopile detectors (MTS2SENS, MTS4SENS), and pyroelectric detectors (MPS2SENS, MPS4SENS), allowing you to flexibly adapt operating parameters to your specific requirements using the specially developed eNDIRi² app software.

Experience a new way of evaluating and selecting optimal components, prototyping for the quick implementation and testing of new measurement systems, research and development for conducting concept studies and laboratory tests. Get hands-on, measure with confidence, and bring your NDIR projects to life faster than ever with Micro-Hybrid.