How is the SPECTRACAP® sensor different from the CARBOCAP® NDIR sensor?

The basic operating principle is the same in both sensors. Both measure optical absorption at an absorption wavelength characteristic to the gas being measured. This signal is then compared to a nearby non-absorbing wavelength for reference. The CARBOCAP^® non-dispersive infrared (NDIR) sensor uses a broadband light source and a tunable filter to measure absorption over an entire carbon dioxide absorption band in the 4.2 µm mid-infrared region. The SPECTRACAP^® tunable diode laser (TDL) uses a narrow band tunable light source to measure a single oxygen absorption peak in the 760 nm visible/near infrared region.