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Vol. 73, No. 11, November 2006




Table of Contents



(click an abstract title to download a full pages article)


Palladium Nanoparticle Hydrogen Sensor


Abstract: An innovative hydrogen sensor based on palladium (Pd) nanoparticle networks is described in the article. Made by Applied Nanotech Inc. sensor has a fast response time, in the range of seconds, which is increased at 80°C due to higher hydrogen diffusion rates into the palladium lattice. The low detection limit of the sensor is 10 ppm of H2, and the high limit is 40,000ppm. This is 100% of a lowest flammability level of hydrogen. This range of sensitivities complies with the requirements that one would expect for a reliable hydrogen sensor.


I. Pavlovsky, P. Soundarrajan, Z. Yaniv

Applied Nanotech Inc., USA



Preparation of Multiwalled Carbon Nanotube-Poly (4-Styrenesulfonic Acid) Aqueous Dispersion

for Dopamine Sensing


Abstract: A simple and facile method for the non-covalent functionalization of multi-walled carbon nanotubes (MWNTs) using poly(4-styrenesulfonic acid) (PSS) is proposed. The resulting PSS-MWNTs dispersion is readily soluble in water and can be left to stand for 2 weeks at room temperature, no phase separation with aggregation of nanotubes at the bottom of the vials was observed. The as-prepared PSS-MWNTs dispersions could facilitate the processing of the nanotubes into composites with high nanotube loading. The PSS-MWNTs complex shows high electrocatalytic activity to the oxidation of neutrontransmitter of dopamine, suggesting that the coating of PSS onto carbon nanotubes surface without destroying the electronic structures of the pristine carbon nanotubes; therefore, the unique properties including the catalytic property of the nanotubes retained. It is envisioned that the PSS-MWNTs aqueous dispersions may find possible applications in the development of biosensors, bioelectronics, separation and environment protection as well as other biological events where water-based environment is required.


Aihua LIUa and Jin WANGb

aMichigan State University, USA

bNano-Medical Engineering Laboratory, Riken Institute, Japan



Novel Fabrication of CA Membrane Bound Carbon Electrode for Bi-enzymatic Determination of Lactate


Abstract: Lactate oxidase from Pediococcus species has been immobilized onto cellulose acetate (CA) membrane to form an enzymatic membrane. HRP has been incorporated into carbon paste electrode. Enzymatic membrane was mounted over the HRP-carbon paste electrode with the help of dialyses membrane, which acts as working electrode. Lactate biosensor was constructed by connecting this fabricated working electrode to Ag/AgCl reference electrode along with platinum wire auxiliary electrode through potentiostate. The biosensor showed an excellent performance with a linear response range between 5µM to 1mML-1 of lactate with a correlation coefficient (r) of .94 for n=30, when compared to standard colorimetric methods. The optimum pH of the biosensor is 6.5 and incubation temperature is 25°C. This bi-enzyme electrode can be used for 150 determinants; over 45 days with out any considerable lose of activity, when stored at 4°C in 0.5M sodium phosphate buffer (pH 6.5). The response time was 1 second and no major metabolic interference was observed.


Vikas, Harish, D. S. Ahlawat

Ch. Devi Lal University, India



Investigation of Pull-In Phenomenon of Rectangular Micro-Plate Subjected to Nonlinear Electrostatic Pressure


Abstract: In the present work a pull-in voltage of a micro plate subjected to nonlinear electrostatic pressure was studied. The governing equation was derived and in order to linearize the nonlinear governing equation; step-by-step linearization method was used and finite difference method was applied to discretize the linearized equation. The numerical results reveal that the step-by-step linearization method is highly efficient, fast and easiest one to calculate the pull-in voltage. The obtained results for different size of micro plate, initial gap and thickness were shown those effects on the pull-in voltage.


A. Nabian, G. Rezazadeh, M. Haddad-Derafshi, A. Tahmasebi

Urmia University, Urmia, Iran



Effective Factors on Methane Sensing of Tin-Oxide Activated by Palladium in Sol-Gel Process


Abstract: Stannic oxide thin films activated by palladium were prepared by sol-gel method. The morphology of the layers and the size of the particles were investigated by scanning electron microscopy and atomic force microscopy. Investigations showed that the number of coating, annealing procedure and the viscosity of the sol, affect structure and thickness of the layers. These different preparing conditions result in different change in resistivity of the samples toward methane gas. In addition to these parameters, the Pd/Sn atomic ratio in the sol is another effective factor on sensitivity of methane.


Davood Abbaszadeha, Roghayeh Ghasempoura, Fereshteh Rahimi, Azam Iraji zad

University of Technology, Tehran, Iran



Structural and Optical Properties of Chemically Deposited Nanocrystalline Thin Films of Non-Stoichiometric CuInS2


Abstract: Nanocrystalline thin films of non-stoichiometric CuInS2 have been deposited on glass substrates by chemical bath deposition method. The deposition parameters such as pH of the solution, solution concentration, temperature of the bath, time of deposition etc. have been optimized for obtaining nanostructured films. As deposited films have been annealed at 250 oC in vacuum for 1h. The films were characterized by x-ray diffraction, scanning electron microscopy, energy dispersive x-ray analysis, absorption and transmission spectroscopy. The results are discussed.


M.D. Mahanubhav, L.A. Patil, P.S. Sonawane, R.H. Bari, V.R. Patil

P.G. Department of Physics, Pratap College, India





High-Reliability Thermocouple Sensor Optimized for High-Purity Processing Applications


A new design of thermocouple assembly from the Partek division of Parker Hannifin provides an exceptionally reliable temperature monitoring sensor for high-purity fluid systems which traditionally use fluoropolymer components. The sensor assembly overcomes perceived weaknesses with current thermocouple sensors that potentially reduce long term stability, and is expected to deliver considerable cost savings to users over its lifetime. Designated the TS Series, the assembly has been designed as an alternative to sensors for high-purity flow systems that are fabricated by bonding the thermocouple wires between fluoropolymer tubing elements, a form of installation often carried out by end users. From analysis of failed parts used in this type of installation, Partek found that the bonding temperature can damage the wires' insulation. Such damage creates a wicking path for the flow media that leads to eventual failure of the wiring. When the sensors are used in clean room environments, the related downtime costs associated with diagnosing and fixing any such failure can be extremely high ...


Parker Hannifin Corporation - Partek,

7075 East Southpoint Road, Tucson, AZ 85706, USA

Tel.: 520 574 2600

Fax: 520 574 2700


Thermocouple Sensor



Pressure Sensors Offer High Pressure Ratings


Mount Olive, NJ, - American Sensor Technologies (AST) introduces the new AST47HP Series of Pressure Sensors. This new line addresses the growing need for pressure sensors with higher pressure ratings.  Available in pressure ratings up to 60,000 PSIG (4,000 Bar), the AST47HP Pressure Sensors are ideal for operation in diesel fuel rails, high-pressure wells, hydraulics, injection molding equipment, water jets, down hole instrumentation and more.


AST47HP sensors incorporate a one-piece stainless steel sensing element, which is free of silicone oil, welds or O-rings.  The absence of these characteristics eliminates the chance of contamination from outside media, critical in food processing applications.  With AST’s Krystal Bond Technology, the sensing element offers a thick diaphragm that eliminates long-term drift, which can be common in high pressure and high cycle applications ...


Karmjit Sidhu,

American Sensor Technologies,

450 Clark Drive, Mt. Olive, NJ 07828

Tel.: 973-448-1901

Fax: 973 448-1905

E-mail: ksiddhu@astsensors.com

AST47HP Series Pressure Sensor



Multi-Component Load Cells


FUTEK Advanced Sensor Technology’s Multi Component Sensors are designed to measure multiple forces and moments simultaneously. They are designed to accurately measure up to six components (3 forces and 3 moments) of load. For example, independent strain gauge bridges are used to measure three directions of force: longitude, latitude, and vertical, as well as the moments about each force direction ...


Oanh Bui, Marketing Associate

FUTEK Advanced Sensor Technology

10 Thomas, Irvine, CA 92618, USA

Toll Free: 1-800-23-Futek, tel.: 949-465-0900, fax: 949-465-0905

E-mail: oanh@futek.com

Multi-Component Load Cells



Monolithically Integrated 256-pixel CMOS Line Sensor


The 256x1 CMOS line sensor iC-LFL1402 is functionally compatible with the 1402 standard (serial mode) and operates with a pixel clock pulse of up to 5 MHz. Thanks to monolithic integration the 200 μm pixels are arranged in a 63.5 μm grid (400 DPI) without gaps or distortion and are thus ideal for use in spectroscopy applications, for example. The integrated control logic needs only a start and clock signal to generate the light/voltage conversion at the analog output.


The range of possible applications is considerably extended by the inclusion of an electronic shutter.  This permits the length of integration to be varied externally. The analog output push-pull output enables a high readout clock rate and a wide signal dynamic range. Should the 5 MHz clock rate not be required, the power consumption of the IC can be reduced by an external bias current setting. The device has a supply voltage of 5 V. In the optoBGA package there is an operating temperature range of -25 to +100 °C ...


Uwe Malzahn

iC-Haus GmbH, Am Kuemmerling 18,

D-55294 Bodenheim, Germany

Tel: +49 - (0)6135 - 9292-300 

Fax: +49 - (0)6135 - 9292-192

E-mail: sales@ichaus.com

CMOS Line Sensor



Wireless and Wired Load Indicators for Innovative Capacitive Load Sensors


Loadstar Sensors Inc. of Mountain View has launched a new line of load indicators that are designed to work seamlessly with its patent-protected capacitive sensors. The products launched include the DS-2100 and the DS-2100 WiFi displays.


The DS Series of displays work seamlessly with Loadstar's LoadVUE software. LoadVUE is a Microsoft WindowsXP based application that connects with the DS-2100 and DS-2100 WiFi to enable a user to perform calibration on up to four attached sensors, display individual and total loads on screen and log to a data file ...


Div Harish

Loadstar Sensors, Inc.

453 Ravendale Drive, Suite F

Mountain View, CA 94043, USA

Tel.: 1-650-938-4282, fax: 1-650-938-4285

E-mail: div@loadstarsensors.com

Wireless Load Indicator



Linear Displacement Transducers


DS Europe, in order to satisfy this need, is proposing series PC magnetostrictive position transducers. Series PC is measuring absolute positions without contact and wear between cursor and transducer probe and can withstand in a good way shocks, vibrations and dirtyness (IP65 ). Series PC can measure up to two cursor positions, It has a check up system for an easy installation and can measure also velocities. Applications: presses, dancing roll position on textile or converting machines,  plastic blowing machines, ceramic and marble machines, liquid batching machines, wood-working machines, paper machines, drilling machines, machine tools and where it is necessary to have high long term reliability ...


Dario Piardi,

DS Europe S.r.L.,

Tel: 0039 02 8910142

Fax: 0039 02 89124848

E-mail: dseurope@dseurope.com

Displacement Transducers



Core Sensor Offers Three-Wire Option to Seal Out Wet Environments


CARY, N. C. - MTS Systems Corp., Sensors Division has enhanced its C-Series Core Sensor by adding a three-wire option that provides manufacturers with additional design alternatives in wet environments. Standard C-Series sensors include a connector in the electronics housing to attach a mating-connector equipped cable. In a wet environment, cables can wick water or other liquids down the inside of the cable jacket if a more expensive sealed cable is not used or the other end of the cable jacket is exposed. MTS Sensors offers an alternative to high-cost sealed cables by replacing the connector and cover with three discrete wires that allow sealing against the wire insulation instead of a cable jacket. A simple grommet can then be used to provide tight water sealing ...


Jesse Russell,

MTS Commercial Products Marketing Manager

Tel.: 919-677-0100


E-mail: jesse.russell@mts.com

C-Series sensors



Ultra Low Noise Remote Charge Converter for Precise Piezoelectric Transducer Measurements


Endevco Corporation announced the introduction of its new model 2771C ultra low noise remote charge converter. The 2771C improves upon the industry standard 2771B by reducing low frequency noise by over 50 percent compared to currently available devices, enabling more precise measurements from piezoelectric transducers.


The Endevco model 2771C transforms a piezoelectric transducer’s high impedance charge output to a low impedance voltage proportional to the transducer’s charge output. This low impedance signal output is less susceptible to noise pick-up which is vital for critical measurement applications including mechanical system health monitoring, modal analysis, flight testing and drop testing ...


Yeni Hoo,

Senior Communications Specialist,

Tel.: 949.493.8181 x242

E-mail: yeni.hoo@endevco.com

Remote Charge Converter



Single-Chip Energy Meter ICs Cut Power Consumption


Analog Devices, Inc. is introducing two families of single-chip energy meter ICs that combine intelligent battery management and ADI's innovative signal processing technology to address the need of the world's electricity markets for feature-rich, highly reliable meters. Increasingly, solid-state, failure-resistant energy meters, such as those enabled by Analog Devices, are replacing aging electro-mechanical systems by providing consistently dependable measurement and new functions, like remote meter-reading.


ADI's new ADE7100 and ADE7500 energy meter SoC (system-on-chip) families include devices with intelligent battery modes that allow the meters to maintain the time, sense temperature changes, run the LCD (liquid crystal display) read-out, and perform other critical system functions, while using at least 40 percent less power than competitive solutions ...


Analog Devices, Inc.

804 Woburn Street

Wilmington, MA 01887

Tel.: 1/800-262-5643

Fax: 781/937-1021

Single-Chip Energy Meter



New-Generation Handheld Vibration Spectrum Analyzers for Machine Diagnostics and Predictive Maintenance


November 7, 2006, Campbell , CA - Datastick Systems, Inc., introduced the VSA(TM)-1214 and VSA-1215 Vibration Spectrum Analyzers, its new-generation PDA-based vibration data collectors and analyzers that enable facilities of all sizes to use vibration analysis in machine-condition monitoring, predictive maintenance, and routine troubleshooting to reduce costs and downtime. The announcement was made by Michael Scandling, Vice President of Marketing, at the Datastick Systems, Inc., headquarters in Silicon Valley.


The pocket-sized system includes the all-new Datastick® VSA-1214 or VSA-1215 Vibration Spectrum Analyzer module attached to a state-of-the-art Palm T|X handheld computer with Datastick Spectrum version 1.6 software, which collects vibration measurements and displays and stores them as time waveforms and FFT spectra. The system also includes the new version 1.6 of Datastick Reporting System(TM) (DRS) for VSA, which imports the data from the handheld into a special Microsoft® Excel®-based application on the PC. The new products are shipping this week ...


Michael Scandling, V.P. Marketing

Datastick Systems, Inc.

Tel.: (408) 871-3300

Fax: (408) 871-3313


E-mail: mike@datastick.com

VSA-1215 Vibration Spectrum Analyzer






Multisensor Data and Information Processing

(Special Issue, August 2005)


S&T Special Issue's cover





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