Introducing the T-Stick: A new device for high precision in situ sediment temperature profile measurements

2012 ◽  
Vol 10 (1) ◽  
pp. 31-40 ◽  
Author(s):  
Tomas Feseker ◽  
Gero Wetzel ◽  
Bernd Heesemann
Keyword(s):  
Temperature Profile ◽  
High Precision ◽  
New Device ◽  
Sediment Temperature

Synoptic time-scale variability of sediment temperature profile and sound speed in shallow seas derived from in situ observations

2020 ◽  
Vol 244 ◽  
pp. 106932
Author(s):  
Guang-Bing Yang ◽  
Quanan Zheng ◽  
Xiaomin Hu ◽  
De-Jing Ma ◽  
Zhao Chen ◽  
...  
Keyword(s):  
Temperature Profile ◽  
Time Scale ◽  
Sound Speed ◽  
Sediment Temperature ◽  
In Situ Observations ◽  
Shallow Seas

Ion track etching of polycarbonate membranes monitored by in situ small angle X-ray scattering

2021 ◽  
Author(s):  
Alexander Kiy ◽  
Christian Notthoff ◽  
Shankar Dutt ◽  
Mark Grigg ◽  
Andrea Hadley ◽  
...  
Keyword(s):  
High Precision ◽  
Small Angle ◽  
Selective Dissolution ◽  
X Ray ◽  
Ion Tracks ◽  
X Ray Scattering ◽  
Track Etching ◽  
Polycarbonate Membranes ◽  
Ray Scattering

In situ small angle X-ray scattering (SAXS) measurements of ion track etching of polycarbonate foils are used to directly monitor the selective dissolution of ion tracks with high precision, including...

scholarly journals In-situ observations of the isotopic composition of methane at the Cabauw tall tower site

2016 ◽  
Author(s):  
Thomas Röckmann ◽  
Simon Eyer ◽  
Carina van der Veen ◽  
Maria E. Popa ◽  
Béla Tuzson ◽  
...  
Keyword(s):  
Isotopic Composition ◽  
High Precision ◽  
Temporal Resolution ◽  
Isotope Ratio ◽  
Mesoscale Model ◽  
Ambient Air ◽  
Model Calculations ◽  
Dual Isotope ◽  
Methane Budget

Abstract. High precision analyses of the isotopic composition of methane in ambient air can potentially be used to discriminate between different source categories. Due to the complexity of isotope ratio measurements, such analyses have generally been performed in the laboratory on air samples collected in the field. This poses a limitation on the temporal resolution at which the isotopic composition can be monitored with reasonable logistical effort. Here we present the performance of a dual isotope ratio mass spectrometric system (IRMS) and a quantum cascade laser absorption spectroscopy (QCLAS) based technique for in-situ analysis of the isotopic composition of methane under field conditions. Both systems were deployed at the Cabauw experimental site for atmospheric research (CESAR) in the Netherlands and performed in-situ, high-frequency (approx. hourly) measurements for a period of more than 5 months. The IRMS and QCLAS instruments were in excellent agreement with a slight systematic offset of +(0.05 ± 0.03) ‰ for δ13C and –(3.6 ± 0.4) ‰ for δD. This was corrected for, yielding a combined dataset with more than 2500 measurements of both δ13C and δD. The high precision and temporal resolution dataset does not only reveal the overwhelming contribution of isotopically depleted agricultural CH4 emissions from ruminants at the Cabauw site, but also allows the identification of specific events with elevated contributions from more enriched sources such as natural gas and landfills. The final dataset was compared to model calculations using the global model TM5 and the mesoscale model FLEXPART-COSMO. The results of both models agree better with the measurements when the TNO-MACC emission inventory is used in the models than when the EDGAR inventory is used. This suggests that high-resolution isotope measurements have the potential to further constrain the methane budget, when they are performed at multiple sites that are representative for the entire European domain.

scholarly journals High precision machining of a displacement sensor for helicoidal motions

2021 ◽  
Author(s):  
Zeina ELRAWASHDEH ◽  
Philippe REVEL ◽  
Christine PRELLE ◽  
Frédéric LAMARQUE
Keyword(s):  
High Precision ◽  
Fiber Optic ◽  
Geometric Model ◽  
Translational Motion ◽  
Surface Characteristics ◽  
Measurement Range ◽  
Linear Displacement ◽  
Displacement Sensor ◽  
Fiber Optic Probes

Abstract This research study presents the design and the high precision manufacture procedure of a fiber-optic displacement sensor. It is composed of two fiber-optic probes associated with a structure of a cones’ grating. The sensor is characterized by its ability to measure the linear displacement for an axis performing a helicoidal motion. This motion has been demonstrated on a high precision lathe; where the spindle provided the rotational motion, associated to a translational motion on the linear stage. This allowed to obtain the two simultaneous motions. The displacement of the translational stage is measured by the sensor in real time.Firstly, a highly precise geometric model of the reflector part for the sensor was developed. This model provided a specific geometry for the cones-assembled grating, which has been precisely manufactured. The geometric parameters and the surface characteristics of each step in the fabricated grating were both identified in situ on the lathe. The agreement between simulation and experimental results is excellent. The performances of the fiber-optic displacement sensor were identified in-situ on the lathe. The analysis of the voltage output signals from the two fiber-optic probes is used to measure the grating displacement. The unbalanced rotation due to non-centered axes was also characterized. The sensor provided a micrometric resolution, on a measurement range of more than one centimeter.

scholarly journals SISI: A New Device for In Situ Incubations at the Ocean Surface

2017 ◽  
Vol 5 (4) ◽  
pp. 46 ◽  
Author(s):  
Janina Rahlff ◽  
Christian Stolle ◽  
Oliver Wurl
Keyword(s):  
Ocean Surface ◽  
New Device
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