NDIRsim – Simulate Gas Measurement
Simulate. Optimize. Validate. Calculate absorption in your NDIR setup — capturing the full interaction of gas, optical filter, and detection conditions.
Why NDIRsim?
NDIRsim is ideal for development engineers and OEM teams in medical, industrial, environmental, and aerospace applications who need precise and robust measurement of infrared-active gases.
Plan measurement accuracy with confidence
calculate spectral absorption as a function of path length based on the Beer–Lambert law under freely selectable gas, pressure, and temperature conditions.
Optimize your filter design
compare filter configurations (CWL, HBW, transmission) for your selected gas.
Reduce time-to-result
virtual experiments eliminate lengthy lab iteration loops.
Perfect for Micro-Hybrid setups
includes a library of pre-defined IR filters from the Micro-Hybrid portfolio.
Shop integration
easily order stocked NDIR components directly from the shop.
Three simple steps in the NDIR simulator
1 . Define the gas & conditions
Choose a gas, temperature, and pressure, then set the spectral range and resolution (sampling points). The software automatically converts wavenumber (cm⁻¹) and wavelength (nm/µm), pulls data from the industry-standard HITRAN spectral line database, and displays the spectral absorption coefficients across your selected range.
2 . Match filter properties to your gas
Select or design an optical filter with CWL, HBW, and Tmax. NDIRsim overlays the filter curve directly onto the line spectrum. You’ll immediately see how well the filter aligns with your gas absorption band. Choose from available Micro-Hybrid filters or upload your own transmission curves.
3 . Simulate path length and concentration
Define optical path length and concentration range. NDIRsim generates characteristic curves of absorption (in %) across the selected range, provides a visual basis for choosing calibration points, and displays exact calculated values when hovering over the curve.
Real Scientific-Level Simulation
NDIRsim is built on a physical model based on the Beer–Lambert law, combined with instrumental parameters such as filter bandwidth and optical path. The software supports freely selectable temperature and pressure scenarios, allowing realistic simulation of diverse environmental conditions.
Calculations rely on the globally established HITRAN reference database, computing spectral line shapes for your selected range. Automatic conversion between wavenumber (cm⁻¹) and wavelength (nm/µm) ensures consistent, comparable results.
Accuracy Note: Simulations do not replace final calibration in the target device. NDIRsim provides robust design guidelines and variant comparability.
Some specifications may require custom manufacturing. Technical feasibility is evaluated case by case.
Core Features
- Filter design: Use library CWL, HBW, and transmission values or define your own
- Parameters: Concentration, CWL/HBW, path length, temperature/pressure
- Optical path length specified in centimeters
- Filter Wizard: recommends CWL/FWHM ranges matched to the gas band
- Project storage: compare variants, document versions
- Export: CSV, PNG, PDF; BOM transfer to the Micro-Hybrid shop
- Team handoff: specification sheet for purchasing & quality assurance
Results & Benefits
- Validate selectivity and determine how well your filter matches the target gas
- Estimate signal-to-noise via absorption peaks and filter choice
- Choose calibration points data-driven (linear/linearized regions)
- Balance optical path length vs. housing size
Technical Specifications
- Gases: H₂O, CO₂, O₃, N₂O, CO, CH₄, NO, SO₂, NO₂, NH₃, HNO₃, OH, HF, HCl, HBr, HI, ClO, OCS, H₂CO, HOCl, HCN, CH₃Cl, H₂O₂, C₂H₂, C₂H₆, PH₃, COF₂, SF₆, H₂S, HCOOH, HO₂, ClONO₂, NO⁺, HOBr, C₂H₄, CH₃OH, CH₃Br, CH₃CN, CF₄, C₄H₂, HC₃N, CS, SO₃, C₂N₂, COCl₂, SO, CH₃F, GeH₄, CS₂, CH₃I, NF₃ plus anesthetic gases Halothane/xFluranes
- Inputs: Gas, temperature (°C or K), pressure (atm or mbar), wavenumber/wavelength, path length, concentration range, sampling points, volume percent
- Filter parameters: CWL/CWN, HBW, Tmax
- Outputs: Absorption (%), characteristic curves
- Platform: Browser app (Chrome/Edge/Firefox), no additional software required
Price & Licenses
Frequently asked questions
What data does NDIRsim use?
Industry-standard spectroscopic reference data from the HITRAN database for line calculations.
Can I simulate my own filters?
Yes — define CWL/CWN, FWHM, and Tmax yourself. Pre-configured Micro-Hybrid filter values are also available.
Does NDIRsim support temperature/pressure effects?
Yes. Line width and line position are recalculated based on selected conditions.
How close is this to real-world performance?
Ideal for concept and pre-series design. Certain boundary effects (mechanical, electrical, additional optical) are not modeled. It does not replace a physical setup but enables theoretical comparison of variants.
Which browsers and IT requirements apply?
Any up-to-date browser; no admin rights required.
Micro‑Hybrid – All-in-one IR-Supplier
With over 30 years of experience in IR sensor technology, packaging, and customized OEM solutions, Micro-Hybrid is a reliable partner to its customers. From MEMS manufacturing to complete modules, you get everything from a single source—with a deep understanding of the requirements of the respective industry. Our expertise ranges from medical technology and industrial automation to environmental applications and rail, aviation, and aerospace.
