GASCOFIL is an optical instrument for detecting trace gases in the ppb to percent range concentrations. It works by measuring the spectral signature of a target gas using the highly specific and sensitive technique of correlation spectroscopy. This powerful diagnostic tool involves a correlative comparison between the optical spectrum of a target molecule and spectral mask function in the instrument. By use of multiple masks and/or multiple detectors several gases can be detected with one optical system.Since no complex or alignment sensitive optics are required the base cost of the instrument, power consumption, size and weight are minimized. A typical remote sensing application uses a sensor that weighs less than 5 kg with power consumption less than 20 watts.
1. DOUBLE PATH SENSORIn this mode the instrument measures the column density of a target gas between sensor and retro-reflector. Path length can vary from 0.3 m to approximately 1000 m.Specifications:Sensor Size: 40 x 30 x 20 cmMass: 5kgPower: <30 watts @ 12 VData port: RS 232Detection limits: 0.1 to 10 ppm-m for IR absorbing gasses
2. AMBIENT GAS POINT SENSORIn this mode gas is drawn through the instrument and measured in-situ from a closed system or designated sample point. The instrument is configured as a folded path sensor with an internal multi-path.Specifications:Sensor Size: 100 x 30 x 20 cmMass: 10 kgPower: < 30 watts @ 12 VData port: RS 232Internal multi-path cell optical path: 1 to 20 metersDetection limits: 0.1 - 10 ppm-m for IR absorbing gasses
3. REMOTE SENSORThis mode utilizes direct or reflected sunlight or background thermal IR to detect total column concentrations of specific gases. This configuration mode is suitable for mounting on a vehicle to look upward or scan a defined field of view. The sensor can also be mounted from an aircraft, balloon or orbiting platform to view downwards. A high sensitivity version of this remote sensor, named ViewGAS, was developed between 1998 and 2004. This remote sensor improves on the sensitivity of GASCOFIL by more than 10 times and has been used to detect small natural gas pipeline leaks.Specifications (GASCOFIL Remote Sensor):Specifications (ViewGAS Remote Sensor):Sensor Size: 40 x 30 x 20 cm Sensor Size: 50 x 25 x 20 cmMass: 5 kg Mass: 7 kgPower: < 20 watts @ 12 V Power: < 40 watts @ 12 VData port: USB or RS 232 Data port: USB