Infrared (IR) Bandpass Filter

  • Central Wavelengths from 1.94 to 12.50 µm
  • Wideband Filters with 600nm Bandpass Region (FWHM)
  • Narrowband Filters Designed for Gas Absorption Lines with Bandwidths from 50 to 150 nm
  • Ø100.0 mm for Starting Quantity (Can be diced to smaller sizes)
  • Sapphire, Germanium, Silicon as Substrate

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Common Gas and Relevant Filters

Gas Active Filter (μm) Reference Filter (μm)
Carbon Dioxide (CO₂) 4.26 3.95
Carbon Monoxide (CO) 4.67 4.00
Methane (CH₄) 3.31 3.95
Nitrous Oxide (N₂O) 4.50 4.00
Sulfur Dioxide (SO₂) 7.30 6.90
IR Source Gas Sample Chamber Active Filter Ref. Filter Active Detector Ref. Detector NDIR Gas Detection Method

How NDIR Gas Detection Works

Based on the image showing the NDIR (Non-Dispersive Infrared) gas detection method, here's a simple explanation of how it works:

  1. IR Source: The orange circle on the left emits infrared light (similar to heat waves).
  2. Gas Sample Chamber: The light travels through this blue chamber containing the gas sample being analyzed.
  3. Filters and Detectors: The light then passes through two different paths:
  4. Detection Process:
  • If the target gas is present in the chamber, it will absorb some of the infrared light passing through the active path
  • By comparing the readings from both detectors, the system can determine if the target gas is present and in what concentration
  • The more gas present, the more light is absorbed, and the greater the difference between the two detector readings
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