On-line Magazine
'Sensors & Transducers' (S&T
e-Digest)
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On-line Magazine
'Sensors & Transducers' (S&T
e-Digest)
(ISSN 1726- 5479)
No. 4, April 2004
Table of Contents
RESEARCH AND DEVELOPMENTS
Multisensor System Application for CO2–extracts of Spices Identification
Abstract: For identification of CO2 – extracts of spices (black pepper, nutmeg and coriander) were used a multisensor system consist of 7 quarts crystal resonators modified by different sorbents. As possible sorbents for piezosensors modification fullerene, apiezon L, proksanol 268, polymethylphenylsilicon, triton X – 305, 18-crown-6, polyvinylpyrrolidone were investigated. Presentation of multivariable data involving signals of piezosensors by principal component analysis allows identifying CO2– extracts of the investigated spices. The relationship of sorbents polarity with identification CO2 – extracts possibility were determined.
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Andrew Kalach
Physical department, Institute of Ministry of Internal Affairs,
Voronezh, Russia
Magnetization Reversal in System of Two Co-rich Amorphous Microwires
Abstract: The present work reports on the investigations of the magnetization reversal of the system of two glass covered amorphous microwires with circular magnetic bistability. The experiments have been carried out using the transverse magneto-optical Kerr effect in circular and axial magnetic field. The electric current flowing through two wires in opposite directions produced the circular magnetic field. The successive opposite jumps of circular magnetization appear as a result of mutual interaction of the microwires. A strong influence of the axial magnetic field on the circular bistability has been found. The analysis of the experimental results has been performed in the frame of the model taking into account the superposition of circular magnetic field, produced by the electric current and axial stray fields, produced by the inner cores of microwires. The proposed system could be considered as an active element for the sensor of magnetic field.
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Alexander Chizhik, Arcady Zhukov, Juan Mari Blanko, Julian Gonzalez
UPV, San Sebastián, Spain
Detection of Human Papilloma Virus with Piezoelectric Quartz Crystal Genesensors
Abstract: In present studies, piezoelectric genesensors (PG) was in-house fabricated and then used to identify human papilloma viruses (HPV) in recurrent (22 samples) and original (22 samples) pathological biopsy specimens. PCR and associated dot blot hybridizations were both used to further confirm the results attained from PG instruments. Of the 22 recurrent specimens, 15 samples were positive for HPV6, 2 for HPV 11, 4 for HPV16 and none for HPV18, respectively. And only one sample was negative for any types of HPV. Of the 22 original specimens, 17 samples were positive for HPV6, 3 for HPV 11, 2 for HPV16 and none for HPV18, respectively. When above results were compared with PCR and dot blot hybridizations, they were essentially same except for one specimen. The results showed that the PG technique is a rapid and specific method to analyze HPV.
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Weiling Fu, Qing Huang, Jianghua Wang, Minghua Liu, Junfu Huang, Bing Chen
Southwest Hospital, Chongqing, China
Abstract: In the past, one of the problems associated with automotive crash testing has been the difficulty in reproducing the desired initial position of the dummies within the automobile. With the increased complexity of the crash dummy design and automobile variations, crash testing became more important and the significance of properly positioning and orienting the crash dummy increased greatly. As part of an ongoing effort to learn, predict and assess injury as a result of automotive accidents, new and more advanced crash dummies are being designed and tested. In the forefront, GESAC Inc., located in Kearneysville, West Virginia, is currently working on a contract for National Highway Traffic Safety Administration to design and build the next generation crash test dummy for automotive safety testing.
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1Robert Lamour, 2David S. Beach, 3Marty Berger, 3Eli Marianovsky
1Allied Signal Aerospace, 2GESAC, Inc.,
3Advanced Orientation Systems, Inc.,
PRODUCT NEWS
General Purpose Accelerometer with Integral Cable
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Gaithersburg, MD, March 2004 – Wilcoxon Research, a leading supplier of quality vibration sensors and related equipment, announces the release of a new general-purpose accelerometer with integral cable. This accelerometer, model number 786F, is ideally suited for submerged, high temperature, or other harsh environments where the use of a connector could introduce contaminants to the sensor. It is hermetically sealed and rated to 100psi, enabling installations in up to 200 feet of water. The Teflon-jacketed cable withstands temperatures up to 150 degrees C.
"We developed the 786F with extreme environments in mind," says Steve Wichtendahl, Vice President of Sales and Marketing. "It is most commonly used to measure vibration on the submerged end of vertical pumps. Other customers use the 786F in harsh chemical environments or in applications where frequent machine wash downs are needed."
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Eileen Swanson, Marketing Communications Specialist Wilcoxon Research, Inc. 21 Firstfield Road, Gaithersburg, MD 20878 Tel: 301-330-8811 Fax: 301-330-8873 E-mail: sensors@wilcoxon.com |
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ATEX Approved Measurement Sensors
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Depew, NY - The IMI Division of PCB Piezotronics offers a variety of sensors that are approved to the new ATEX directive 94/9/EC, including general purpose and high frequency ICP accelerometers, velocity output sensors, and 4-20 mA output sensors. Many of these sensors are available with a choice of connector options, such as the industry standard 2-pin military connector, bayonet connector, and an integral cable for submersible applications.
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Tim Geiger, Division Manager IMI Sensors Division 3425 Walden Avenue Depew, NY 14043-2495 Tel: (800) 959-4464, fax: (716)684-3823 E-mail: tgeiger@pcb.com |
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New Early Condensation Detector
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Cooled ceilings and other surfaces with temperature close to dew point temperature are common in both HVAC and industrial applications. The new EE45 from E+E Elektronik is designed for early detection and alarm of the danger of condensation on ducts and plain surfaces. Both sensing element and electronics are protected against pollution by a special coating, while the robust housing makes the instrument highly insensitive to mechanical stress.
The high-precision E+E humidity sensor element is kept at the same temperature as the test object by a thermo-conductive layer. This way, the EE45 measures exactly the relative humidity on the duct or on the surface. If the relative humidity measured exceeds 90% RH, the switch output of EE45 will trigger adjustments of parameters like water temperature in the cooled ceiling, air conditioning set-up and temperature of heaters in order to reduce relative humidity and avoid condensation. |
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Ing. Werner Hentscholek, E+E Elektronik GmbH Langwiesen 7, A-4209 Engerwitzdor, Austria Tel: +43 - 7235-605-0, fax:+43 - 7235-605-8 E-mail: info@epluse.at |
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Dynamic Strain Sensors Monitor Machinery Forces
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Depew, NY - The Force/Torque Division of PCB Piezotronics, Inc., announces the release of the Series M240 Dynamic ICP® Strain Sensors. These devices utilize piezoelectric sensing elements to measure dynamic and quasi-static stress on stationary and moving machinery, and offer a simple technique for monitoring processes and detecting inconsistencies or upsets, A single screw easily installs these units in a non-invasive manner on machinery surfaces, including mechanical presses, machine tools, fast-running production machinery, and automatic assembly machines. Series M240 strain sensors feature integrated microelectronic signal conditioning, solid-state design, and perform in harsh industrial environments.
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Peter Munschauer Division Manager, Force/Torque Division 3425 Walden Avenue, Depew, NY 14043-2495 Phone: (888) 684-0004, Fax: (716) 684-8877 E-Mail: pmunschauer@pcb.com |
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USB Powered, Two Channel ICP® Sensor Powered Conditioner
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Depew, NY - The Vibration Division of PCB Piezotronics, Inc. introduces a pocket sized dual channel ICP® sensor signal conditioner. Model 485B36 offers the low noise performance found in battery powered signal conditioners, but obtains its power from a computer's Universal Serial Bus (USB) port. Besides providing the sensor with the required constant current supply, the 485B36 decouples the sensors bias voltage from the measurement signals.
Other features include BNC jack input connectors, 19.5 VDC @ 4.5 mA sensor excitation power, and a 50 kHz upper frequency range. Output is transferred through the 3.5 mm stereo jack. When used in conjunction with a PC sound card or other data acquisition devices, the unit can record signals from a wide range of accelerometers or microphones that require constant current power. The device is ideal for use in portable measurement applications such as ride control, road testing, and cabin noise.
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Bill Coffta, Inside Sales Manager Vibration Division 3425 Walden Avenue Depew, NY 14043-249 Tel: (888) 684-0013 ext. 2247, fax: (716)685-3886 E-Mail: bcoffta@pcb.com |
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