Introduction to the Tunable Filter Spectroscopy Analyzer

 

 TUNABLE FILTER SPECTROSCOPY

 Introduction to the Tunable Filter Spectroscopy Analyzer

Tunable Filter Spectroscopy (TFS) analyzer is also known as optical gas chromatography. Which is used to measure multiple components such as C1 to C6+, N2, CO2, H2S, Wobbe Index (WI), Specific Gravity and other few components in real time analysis.

Tunable Filter Spectrometer sensor platform consists of a light source, a sample cell for gases, liquids or solids, a wavelength separating element spectrometer and a photo-detector. The wavelength separating element "slices" the wavelength components of the broadband light source which then interacts with the sample molecules. Some of the wavelength components are absorbed and some are transmitted through without any absorption.

Tunable Filter Spectrometers use an advanced spectral decomposition algorithm. The resulting spectrum is called absorption spectrum, which acts as "fingerprints" which are used to identify the sample components and/or quantify the composition of the sample.

 

 

 

Measurement Principle

When a gas sample is introduced in the gas cell, the light radiation provided by a broadband light source is partially absorbed by the gas species present. The light absorption occurs at specific frequencies and magnitudes depending on the gas compound and the concentration of that compound. The spectrometer module scans the wavelength and measures the true absorption spectra and compares them with the pre-loaded calibration spectra. The onboard analysis algorithm computes the gas concentrations in real-time, which can then be output through the MODBUS TCP/IP protocol.

In principal, the absorption spectrum of each compound is unique which acts as a “fingerprint” for identification or speciation analysis. In addition, the magnitude of the absorption is a function of the number of molecules of the gas. With a known path length, pressure and temperature, the magnitudes of the absorption spectra are then used to compute volumetric concentrations. This first principle based technique provides accurate and robust measurements with minimal span and baseline drifts.

The analyzer employs an internal pressure transducer to measure the sample pressure in real-time enabling pressure variation corrections. The flow cell is heated to a constant temperature (default value is 60°C) with a sample preheat module to maintain both sample and optical sensor temperature at a constant calibrated temperature, thereby ensuring measurement accuracy and stability despite sample and environmental variations.

 Reference and image source 

1.       https://www.servomex.com/gas-analyzers/finder/spectrascan-2400/

2.       https://www.mksinst.com/c/precisive-5-hydrocarbon-analyzers

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