GAS CHROMATOGRAPHY / IR SPECTROSCOPY DETECTORS
The only Resonant Photoacoustic Detector designed for Gas Chromatography applications!
Applications
Gas Chromatography (GC)
It is a well known fact that photoacoustic detection is a very sensitive technique in gas analysis. The Spectrosense design employs a measurement cell operating at acoustic resonance for high sensitivity. The use of the Spectrosense resonant photoacoustic detector in gas chromatography (GC) provides several key advantages over the many commonly used technologies.
Features
High Sensitivity
The resonant operating mode provides acoustic signal amplification inside the measurement cell. Detection limits, using a wide IR excitation band (2...10 um), at ppb levels.
Smooth internal flow
The measurement cell has an elongated, tubular cavity of uniform diameter, with no unswept volumes and therefore ideal for GC applications.
Wide range of detectable compounds
This technology is sensitive to any compound that absorbs infrared radiation, only leaving out the gases without a dipole moment. This makes this design an almost universal detector.
Wide range of carrier gases
This technology is compatible with any type of carrier gas that doesn't absorb IR radiation including He, H2, N2 and O2. The lack of sensitivity to O2 and N2 makes the detector less prone to air leak related issues.
Non destructive measurements
The gas sample is not oxidized in the measurement cell and therefore can be further processed.
Simplicity and low cost
The design is very simple and robust, which makes it ideal for intensive laboratory use as well as field instrumentation applications. The main components are: the IR source (hot filament type), the optical chopper (a BLDC motor and a chopper disc), the resonant cell (a machined block made of aluminum or brass with a gold-plated internal cavity to reduce parasitic absorption), two MEMS microphones, and the electronics and software for control and signal processing.