Non-Dispersive Ultraviolet Spectroscopy
Accurate. Selective. Proven.
NDUV - Non-Dispersive Ultraviolet Spectroscopy
NDUV, Non Dispersive Ultraviolet Sectroscopy is a well-established measurement principle for the detection of gases that absorb in the ultraviolet spectrum – including ozone (O₃), sulfur dioxide (SO₂), nitrogen dioxide (NO₂), and other photochemically active compounds.
At KNESTEL, we develop robust and high-performance NDUV OEM sensors and analyzers for demanding applications in process monitoring, ambient air measurement, and mobile plasma disinfection systems. Our technology stands for uncompromising precision, fast response, and long-term reliability – in a compact, integrable format.
NDUV operates by passing UV light through a gas sampling cell. Specific gases absorb characteristic UV wavelengths. A UV-sensitive detector quantifies the absorption, which is directly related to the gas concentration. No moving parts, no chemical reagents – just solid-state, maintenance-friendly sensing. Our NDUV sensors are based on modern UV-LED emitters and a drift-compensating reference detector. The optical assembly is fully temperature-stabilized, providing reliable operation across changing ambient conditions. Optional integration of additional sensors (e.g. electrochemical O₂) allows hybrid measurements in a single compact platform.
Technology factsheet
We have summarized the most important information about the technology, possible applications and our technical design options in a clear factsheet.
Non-Dispersive Ultraviolet Spectroscopy
Benefits at a glance
Highly selective
Ideal for detecting UV-absorbing gases such as ozone, SO₂, or NO₂ with excellent specificity.
Very low detection limits
Enables precise measurement even at very low concentrations – down to 60 µg/m³ for O₃.
Fast response
NDUV's fast response time makes it perfekt for real-time analysis and process control
No consumables needed
Operates without calibration gases or chemical reagents, reducing maintenance and operating costs.
Outstanding stability
Thermal stabilization and auto zero-point calibration ensure long-term reliability in field applications.
Compact & integrable
Designed for embedded use in OEM systems – perfect for mobile, battery-powered applications. CAN communication and modular electronics simplify system integration and customization.
Non-Dispersive Ultraviolet Spectroscopy
What we offer
Need help?
We look forward to help you choose the perfect gas analysis products for your needs. Talk to us about different technologies and our customer-specific LAS gas analyzers or OEM sensors.
