scholarly journals Performance of in situ vs laboratory mid-infrared soil spectroscopy using local and regional calibration strategies

Geoderma ◽  
2022 ◽  
Vol 409 ◽  
pp. 115614
Author(s):  
Isabel Greenberg ◽  
Michael Seidel ◽  
Michael Vohland ◽  
Heinz-Josef Koch ◽  
Bernard Ludwig
Keyword(s):  
Mid Infrared

In Situ Trace Analysis of Oil in Water with Mid-Infrared Fiberoptic Chemical Sensors

2012 ◽  
Vol 84 (3) ◽  
pp. 1274-1280 ◽  
Author(s):  
Yuliya Luzinova ◽  
Bogdan Zdyrko ◽  
Igor Luzinov ◽  
Boris Mizaikoff
Keyword(s):  
Chemical Sensors ◽  
Trace Analysis ◽  
Mid Infrared ◽  
Oil In Water

In-situ monitoring of carbon dioxide emissions from a diesel engine using a mid-infrared optical fibre sensor

2011 ◽  
Author(s):  
Elfed Lewis ◽  
John Clifford ◽  
Colin Fitzpatrick ◽  
Gerard Dooly ◽  
Weizhong Zhao ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Diesel Engine ◽  
Optical Fibre ◽  
Carbon Dioxide Emissions ◽  
In Situ Monitoring ◽  
Mid Infrared ◽  
Optical Fibre Sensor ◽  
Fibre Sensor

In Situ Sensing of Volatile Organic Compounds in Groundwater: First Field Tests of a Mid-Infrared Fiber-Optic Sensing System

2003 ◽  
Vol 57 (6) ◽  
pp. 607-613 ◽  
Author(s):  
H. Steiner ◽  
M. Jakusch ◽  
M. Kraft ◽  
M. Karlowatz ◽  
T. Baumann ◽  
...  
Keyword(s):  
Real World ◽  
Fiber Optic ◽  
Silver Halide ◽  
Field Tests ◽  
Reference Analysis ◽  
Mid Infrared ◽  
Sensor Head ◽  
Aquifer System ◽  
Volatile Organic

A prototype mid-infrared sensor system for the determination of volatile organic pollutants in groundwater was developed and tested under real-world conditions. The sensor comprises a portable Fourier transform infrared spectrometer, coupled to the sensor head via mid-infrared transparent silver halide fiber-optic cables. A 10 cm unclad middle section of the 6-m-long fiber is coated with ethylene propylene copolymer in order to enrich the analytes within the penetration depth of the evanescent field protruding from the fiber sensor head. A mixture of tetrachloroethylene, dichlorobenzene, diethyl phthalate, and xylene isomers at concentrations in the low ppm region was investigated qualitatively and quantitatively in an artificial aquifer system filled with Munich gravel. This simulated real-world site at a pilot scale enables in situ studies of the sensor response and spreading of the pollutants injected into the system with controlled groundwater flow. The sensor head was immersed into a monitoring well of the aquifer system at a distance of 1 m downstream of the sample inlet and at a depth of 30 cm. Within one hour, the analytes were clearly identified in the fingerprint region of the IR spectrum (1300 to 700 cm−1). The results have been validated by head-space gas chromatography, using samples collected during the field measurement. Five out of six analytes could be discriminated simultaneously; for two of the analytes the quantitative results are in agreement with the reference analysis.

A method for real time detection of reaction endpoints using a moving window t-test of in situ time course data

2020 ◽  
Vol 5 (9) ◽  
pp. 1642-1646
Author(s):  
Elyse N. T. DiMaso ◽  
Robert W. Bondi ◽  
John Guo ◽  
Alexander G. O'Brien
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Real Time ◽  
Time Course ◽  
Test Method ◽  
Moving Window ◽  
Mid Infrared ◽  
Mid Infrared Spectroscopy ◽  
Time Course Data

In-line Fourier transform mid-infrared spectroscopy (FTIR) in combination with a moving window t-test method was used to determine the endpoint of a reaction with a highly inconsistent rate.

Quantitative in Situ Monitoring of an Elevated Temperature Reaction Using a Water-Cooled Mid-Infrared Fiber-Optic Probe

1996 ◽  
Vol 68 (7) ◽  
pp. 1116-1123 ◽  
Author(s):  
Paul MacLaurin ◽  
Nicholas C. Crabb ◽  
Ian Wells ◽  
Paul J. Worsfold ◽  
David Coombs
Keyword(s):  
Elevated Temperature ◽  
Fiber Optic ◽  
In Situ Monitoring ◽  
Temperature Reaction ◽  
Fiber Optic Probe ◽  
Mid Infrared ◽  
Optic Probe
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