The new TG NIR (near-infrared) spectrometer module expands on the existing range and adopts a high-sensitivity, low-noise InGaAs image sensor, specially selected to match the optical arrangement. The C11118GA is optimised for NIR operation and works in the 0,9 μm to 2,55 μm waveband.
The module consists of a palm-top size polychromator, integrated with optical elements. The cooled InGaAs image sensor is optimised for the required wavelength range and comes with an image sensor driver circuit. The spectrometer module includes both sample software, DLL library and an integrated USB 2.0 interface. PC connection and data acquisition are quick and easy as the user can set measurement conditions, acquire and save data and can generate graphical displays.
The spectrometer module is suitable for applications such as NIR spectrometry, soil and water analysis, life sciences, forensic science and more.
Near-infrared spectrometer module
Temperature Resistant IR Gas Sensor for CO2 and H2O
Designing a high temperature resistant IR-gas sensor for CO2 and water vapor one has to consider the differences in the specific absorbances, spacings between the heated parts and optics/electronics, emission spectrum of cost-saving radiators and high humidity in the measuring gas. Using HITRAN database a sensor model was developed. Water vapor can be measured selectively at 1.85 μm with a chamber length of 20 cm. So CO2 has to be measured at low wavelengths too. In the range of 2.7 μm CO2 absorbs sufficiently but a water absorption is to be considered. The model shows that the CO2 absorption reaches a maximum in the range from 2.7 μm to 2.75 μm with a decreasing water absorption with increasing wavelengths. After finishing the sensor the model was checked with the actual filter curves. The results show a good analogy between model data and measurements and the benefit of modeling in the design of IR-gas sensors. The analyze of cross sensitivity shows strong overlapping bands and a multiplicative influence of water absorption to the CO2 signal. After correction of the absorption signal of 2.7 μm-channel with the absorption signal of the 1.85 μm-channel the cross sensitivity to water vapor was limited to <3% of CO2 measuring range.