Objetivo
The portable (20 kg) instrument to be developed is to detect a wide range of toxic gases by photo-acoustic spectroscopy and Fourier analysis of the spectrum obtained.
The gas is excited by modulated IR radiation generated in a modified Michelson interferometer. The gas absorption is measured photo-acoustically by the gases' acoustic response to the IR radiation. The amplitude of the response is sampled, the sampling process being controlled by turning the Michelson interferometer mirror, the position of the latter being monitored by laser measurement. The time account performed during a turning of the interferometer's mirror is Fourier-transformed, resulting in the gas sample's absorption spectrum.
The improvement on existing photo-acoustic spectroscopic devices is in the Fourier analysis of a whole spectrum at one time, replacing filters that detect only specific gases, thus being the major leap forward. Within one minute or less, toxic gases will be detected and determined in the ppb-lower ppm range, making it extremely suitable for field work.
A new type of gas analyser for use in the field has been developed. It is a Fourier transform infrared spectrometer which uses photoacoustic absorption as the detection principle to identify and measure organic pollution on site in the field. This is particularly required for hazardous waste site management.
The device constructed is robust enough to provide elevated immunity to the effects of movement, vibration and temperature change. Built in software routines provide automatic realignment of the optical measurement system. The device may be powered by a battery power pack. A built in graphics screen allows the display and comparison of both recorded and reference spectra the moment they are available. Time needed for a simple scan is about 50 s, for 8 consecutive scans 2 min 21 s; sampling intervals down to 40 s are possible. Data transfer options allow for automatic monitoring over approximately 3 weeks, depending on measurement frequency and set up; data may be exported in a number of standard formats, such as Hewlett Packard graphics language (HPGL) for creating plot files or ASCII for creating print files for further use in reports. At a weight of 18 kg and maximum dimension of 50 cm, the device is truly portable.
The device can detect and measure gases that absorb infrared light of wave number 650 to 4000 per cm, which is a characteristic most hazardous organics have in common. Depending on gas absorption in this frequency band, the detection threshold is typically in the parts per million (ppm) range. Zero drift is virtually constant over 3 months, thus making the instrument answer to advanced laboratory needs as well.
A new type of gas analyzer for use in the field has been developed by Brel & Kjaer, a Danish enterprise located at Naerum, north of Copenhagen. It is a Fourier Transform Infra-Red spectrometer which uses photoacoustic absorption as the detection principle. The EC Commission granted fnancial assistance to the development of this device within the ACE 89 programme of the DG XI because of the height of innovation and needs to identify and measure organic pollution on-site in the field, being particular required for hazardous waste site management.
The device constructed as being robust enough to provide elevated immunity to the effects of movement, vibration and temperature change. Built-in software routines provide automatic re-alignment of the optical measurement system. The device may be powered by a battery power pack. A built-in graphics screen allows to display and compare both recorded and reference spectra in the moment they are available. Time needed for a simple scan is about 50 s, for 8 consecutive scans it will be 2 min 21 s; sampling intervals down to 40 s are possible. Data transfer options allow for automatical monitoring over approximately 3 weeks, depending on measurement frequency and set-up; data may be exported in a number of standard formats, such as HPGL for creating plot files or ASCII for creating print files for further use in reports. At a weight of 18 kg and maximum dimension of 50 cm, the device is actually portable.
The device can detect and measure gases that absorb infra-red light of wave number 650 to 4000 cm-1, which is a characteristics most hazardous organics have in common. Depending on gas absorption in this frequency band, the detection threshold is typically in the ppm range. Zero drift is virtually constant over 3 months, thus making the instrument answer to advanced lab needs as well.
The Commission expects this device to fill an urgently felt gap in the easy-to-operate in-field monitoring of hazardous substances.
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CORDIS clasifica los proyectos con EuroSciVoc, una taxonomía plurilingüe de ámbitos científicos, mediante un proceso semiautomático basado en técnicas de procesamiento del lenguaje natural. Véas: El vocabulario científico europeo..
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Coordinador
2850 Naerum
Dinamarca
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