Laboratory and field tests of the active composite fence with integrated fiber optic modalmetric sensor and electromagnetic sensor

2016 ◽  
Author(s):  
Konrad Brewczyński ◽  
Marek Życzkowski ◽  
Mieczyslaw Szustakowski ◽  
Łukasz Olszewski ◽  
Piotr Markowski ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Field Tests ◽  
Electromagnetic Sensor ◽  
Active Composite

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.

scholarly journals 386 MECHANICAL ASPARAGUS HARVESTING STATUS--WORLDWIDE

HortScience ◽  
1994 ◽  
Vol 29 (5) ◽  
pp. 486d-486
Author(s):  
Dale E. Marshall
Keyword(s):  
Fiber Optic ◽  
Mechanical Damage ◽  
Field Tests ◽  
Field Capacity ◽  
Labor Costs ◽  
Ground Speed ◽  
Low Field ◽  
Harvesting Costs ◽  
Green Asparagus

For over 86 years producers, processors, engineers, and equipment manufacturers have attempted to mechanize the harvest of asparagus. Over 60 U.S. patents have been issued. Probably the most sophisticated harvester tested was started in 1987 by Edgells Birdseye, Cowra, Australia. After successful field tests of the 3-row, selective (fiber optic), harvester for flat-bed green asparagus used in canning, 3 more were built at a cost of $US 4.5 million, and harvested 500 acres until 1991 when the company ceased canning. Recovery was 30 to 80% with 50% being typical. Wollogong University in Australia is now researching a selective (fiber optic), harvester for flat-bed green asparagus. It utilizes multiple side-by-side 3 in. wide by 24 in. dia. rubber gripper discs which rotate at ground speed. No harvester prototype has been commercially acceptable to the asparagus industry due to poor selectivity, low overall recovery (low yield relative to hand harvest), mechanical damage to spears, low field capacity per harvester, or overall harvesting costs that exceed those for hand harvesting. The reality may be that asparagus production will cease in the traditional geographical areas where growing costs and labor costs are high, although niche fresh markets may help some growers survive.

New Frontiers for Mid-Infrared Sensors: Towards Deep Sea Monitoring with a Submarine FT-IR Sensor System

2003 ◽  
Vol 57 (6) ◽  
pp. 591-599 ◽  
Author(s):  
Martin Kraft ◽  
Michael Jakusch ◽  
Manfred Karlowatz ◽  
Abraham Katzir ◽  
Boris Mizaikoff
Keyword(s):  
Fiber Optic ◽  
Field Tests ◽  
Pollution Monitoring ◽  
Fiber Optic Sensor ◽  
Sensor System ◽  
Modular System ◽  
Remotely Operated Vehicle ◽  
Sensor Head ◽  
Optic Sensor ◽  
Ft Ir

A sub-sea deployable fiber-optic sensor system for the continuous determination of a range of environmentally relevant volatile organic compounds in seawater has been developed. The prototype of a robust, miniaturized Fourier transform infrared (FT-IR) spectrometer for in situ underwater pollution monitoring was designed, developed, and built in our research group. The assembled instrument is enclosed in a sealed aluminium pressure vessel and is capable of maintenance-free operation in an oceanic environment down to depths of at least 300 m. The whole system can be incorporated either in a tow frame or a remotely operated vehicle (ROV). A suitable fiber-optic sensor head was developed, optimized in terms of sensitivity and hydrodynamics, and connected to the underwater FT-IR spectrometer. Due to a modular system design, various other sensor head configurations could be realized and tested, ensuring facile adaptation of the instrument to future tasks. The sensor system was characterized in a series of laboratory and simulated field tests. The sensor proved to be capable of quantitatively detecting a range of chlorinated hydrocarbons and monocyclic aromatic hydrocarbons in seawater down to the low ppb (μg/L) concentration range, including mixtures of up to 6 components. It has been demonstrated that varying amounts of salinity, turbidity, or humic acids, as well as interfering seawater pollutants, such as aliphatic hydrocarbons or phenols, do not significantly influence the sensor characteristics. In addition, the sensor exhibits sufficient long-time stability and a low susceptibility to sensor fouling.

Field tests of a high‐temperature fiber optic lever microphone

1995 ◽  
Vol 97 (5) ◽  
pp. 3252-3252
Author(s):  
Allan J. Zuckerwar ◽  
Frank W. Cuomo
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Field Tests

Field Tests with a Fiber Optic Biosensor

1997 ◽  
Author(s):  
Frances S. Ligler ◽  
George P. Anderson ◽  
Elric Saaski
Keyword(s):  
Fiber Optic ◽  
Field Tests

scholarly journals An Energy Demodulation Based Fiber Optic Sensing System for Landslide Early-Warning

2017 ◽  
Author(s):  
Xing Wang ◽  
Bin Shi ◽  
Guangqing Wei ◽  
Shenen Chen
Keyword(s):  
Fiber Optics ◽  
Early Warning ◽  
Fiber Optic ◽  
Field Tests ◽  
Passive Optical Network ◽  
Laboratory Simulation ◽  
Measured Signal ◽  
Landslide Early Warning ◽  
Fiber Optic Sensing ◽  
The Impact

To help reduce the impact of geohazards, an innovative landslide early-warning technology based on an energy demodulation-based fiber optic sensing (FOS-LW for short) technology, is introduced in this paper. FOS-LW measures the energy change in a sensing fiber at the segment of micro-bending, which can be caused by landslide movements, and automatically raises an alarm as soon as the measured signal intensity in the fiber reaches a pre-set threshold. Based on the sensing of micro-bending losses in the fiber optics, a two-event sensing algorithm has been developed for the landslide early-warning. The feasibility of the FOS-LW technology is verified through laboratory simulation and field tests. The result shows that FOS-LW has some unique features such as the graded alarm, real-time responses, remote monitoring, low cost and passive optical network, and can be applied in the early-warning of landslides.

First field tests with the fiber optic high-temperature borehole seismometer

1997 ◽  
Author(s):  
W. Ecke ◽  
J. Schauer ◽  
R. Willsch ◽  
K.-H. Jaeckel ◽  
R. Stecher ◽  
...  
Keyword(s):  
High Temperature ◽  
Fiber Optic ◽  
Field Tests
Sign in / Sign up

Export Citation Format

Share Document