Laser Dispersion Spectroscopy (LDS) takes a completely new approach to tuneable semiconductor laser based gas sensing. Laser absorption spectroscopy (LAS) systems, rely on probing the absorption signal characteristics to a gas sample and are fundamentally limited to the measurement of small signal changes (absorption) on top of a large background (total light intensity arriving at the detector), which limits the the dynamic range of the acquisition system, impacting the detectable concentration range, precision and sensitivity of the system. MIRICO’s patented LDS technique measures molecular dispersion, which can be thought of as changes in the phase of light as opposed to intensity and uses a differential approach which eliminates the background overcoming a key limitation of standard tuneable diode laser spectroscopy techniques. Furthermore, as the signal is encoded in the encoded in the phase of the light as opposed to intensity, the measurement is resilient to “dirty environments” that affect light intensity such as soot, rain, water vapour or fog.
Our Approach in Brief
- Zero background measurement for enhanced sensitivity, selectivity, dynamic range and accuracy
- Linear response over a broad dynamic range, measure over 5 orders of magnitude concentration range
- Resilient to “dirty environments” such as fog, rain, soot and water vapour
- Ultra high sensitivity at trace levels (parts per billion/ parts per trillion depending on gas)
- Minimal interference in spectral windows, primarily arising from water vapour
- Chemical sensing of a broad range of gases