bullet On-line Magazine 'Sensors & Transducers' (S&T e-Digest)

    (ISSN 1726- 5479)


No. 11, November 2003



Table of Contents




Nano Zinc Ferrite Acetic Acid Gas Sensors for Smuggled Drug Detection in Southern China


Abstract: Drug abuse has been a big problem for China and the world. The detection of drugs became of great importance. In this paper, by analysis the characteristics of suppressed heroin drugs, it was found that most smuggled drugs in southern China is not pure heroin, but hydrochloric heroin. The hydrochloric heroin is easy to hydrolyze and release acetic acid. This result means that smuggled drugs can be indirectly detected by detecting volatilized acetic acid with gas sensor. In this paper the adulterated nano ZnFe2O4 gas sensors were used to detect acetic acid in low concentration. It was found that Ce and La adulterated ZnFe2O4 gas sensors have good sensitivity and selectivity to acetic acid, can be used in drug detection.


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Zheng Jiao*, Minghong Wu, Zheng Qin,

Jianzhong Gu, Minghua Lu

Shanghai Applied Radiation Institute,

Shanghai University, Shanghai 201800, P.R.China

*E-mail: jiaozheng@yahoo.com



Humidity Sensing Properties of ZnWO4-ZnO Composite


Abstract: Humidity sensing properties of composites made from ZnWO4 (ZW) and ZnO (ZO) were investigated. Sintered polycrystalline disks of ZnWO4 (ZWZO-10) and ZnO (ZWZO-01) and composites of ZW and ZO in the mole ratios of ZWZO-8:2, 6:4, 4:6 and 2:8 (ZWZO-8:2 designated as 80 mole % of ZnWO4 and 20 mole % of ZnO), respectively, were subjected to DC resistance measurements as a function of relative humidity in the range of 5-98% RH. The DC conductance measurements were carried out on the samples from which the activation energies were determined. The composite ZWZO-28 has the highest humidity sensitivity (3 x 103) with a response (2 min.) and recovery (7 min.) time attributed to the optimization of pore size and its even distribution in a biphasic matrix which is a metastable mixture of the two terminal phases, ZnWO4 and ZnO.


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Department of Chemistry and Loyola Institute of Frontier Energy (LIFE),

Loyola College, Chennai 600 034, Tamil Nadu, India.

Phone: +91-44-28175660, Fax:+91-44-28175566.

E-mail: ksnagi@vsnl.net, ksnraja@loyolacollege.edu



VHDL- AMS Behavioral Modeling of Smart Sensors


Abstract: This paper deals with some developing architectures and design methodologies for Microsystems integration. Our research activity can be summarized in the following parts: Behavioral modeling, Signal Conditioning and Data Processing and communication. The work that will be presented is related to the Behavioral Modellization of Smart Sensors with VHDL-AMS. This methodology has been applied to a demonstrator developed in CNM, which includes 3 axial and mono-axial accelerometers. The accelerometer can be described as a piezoresistive accelerometer based in a SOI wafer. The models are constructed using VHDL-AMS modeling language, the analogue and mixed-signal extension of modeling standardized by IEEE as the 1076.1-1999. It can be used to describe non-electrical signal or electrical signal, and also allows the combination of discrete and continuous time language constructs. The development of behavioral models for the sensors would permit to simulate them with the models for the electronic signal conditioning from the early design phases.


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Elena MARTIN and Carles FERRER,

Institut de Microelectronica de Barcelona (IMB-CNM, CSIC),

Unitat de Microelectronica, Department d'Informatica, Universitat Autonoma de Barcelona,

Campus Universitari, 08193 Bellaterra (Barcelona), Spain

Phone: +34-93.594.77.00 ext. 1205, E-mail: Elena.Martin@cnm.es



Optimum Electrode Design for Micro-Mechanical Beam Structures Operating

in Voltage-Controlled Actuation Mechanism


Abstract: In this paper, the optimum conditions for actuating a two plate electrostatic MEMS structure wherein the top plate is a freestanding beam structure is discussed. The preferred configurations of basic beam structures of fixed-fixed and fixed-free type are derived for voltage-controlled actuation mechanism. It was found that the required lengths of bottom electrode vary from 45.9% to 52.3% & 39.7% to 42.4% of length of the top plate beam corresponding to fixed-fixed and fixed-free type and voltage-controlled actuation mechanism.


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Robert MERTENS2, and Harrie A. C. TILMANS2

1National MEMS Design Centre (NMDC),

Department of Electronics and Communications Engineering,

Indian Institute of Science (IISC), Bangalore 5600012, India

E-mail correspondence: sghantam@ece.iisc.ernet.in

2MCP-MEMS, IMEC, Kapeldreef 75, B-3001, Leuven, Belgium

3Department of ESAT, KU Leuven, Kardinaal Mercierlaan 94, B-3001, Leuven, Belgium





High Sensitivity Pressure Sensors


Depew, NY - Two new ICP® dynamic pressure sensors from the Pressure Division of PCB Piezotronics, Inc. offer the ability to measure low-level pressure and high-intensity sound pressure levels, both acoustic and ultrasonic. These sensors are designed for monitoring pulsations, turbulence, and noise in hydraulic and pneumatic systems; detecting pressure fluctuations in exhaust systems, compressors, turbines, pumps and pipelines; and measuring noise of jet engines, rocket motors, and weapons discharge. ICP® sensors feature built-in signal conditioning microelectronics to produce clean, low-impedance voltage output signals. These new units have sensitivities of 1,000 mV/psi (Model 106B51) and 5,000 mV/psi (Model 106B52), and feature rugged solid-state, all-welded stainless steel construction for use in environments unsuitable for standard microphones.


Andrea Mohn, Marketing Assistant

PCB Piezotronics, Inc.

3425 Walden Avenue, Depew, NY 14043-2495

Phone: (800)828-8840

Fax: (716)684-0987

E-mail: amohn@pcb.com

106B51/106B52 Pressure Sensor



Industrial Swivel-Mount Accelerometer


Depew, NY - Installing vibration sensors into tight spots is quick and easy with the Swiveler® from IMI. Its unique design facilitates positioning of the integral, side-exit cable, while the floating lock nut secures the sensor into place. A low-cost, smaller-sized alternative to ring-style accelerometers, the Swiveler Model 607A11 offers a small 9/16 inch footprint and 360° cable rotation. The unit's laser-welded, hermetically-sealed design and stainless steel construction allows for permanent installation in dirty, oily, industrial, and submerged applications. With a reference sensitivity of 100 mV/g and a frequency range to 10 kHz (± 3dB), the Model 607A11 is ideal for route-based or on-line monitoring of rotating machinery.


Darin Saskowski, Sales Manager

IMI Sensors Division

3425 Walden Avenue

Depew, NY 14043-2495

Phone: (800) 959-4464, Fax: (716)684-3823

E-mail: dsaskowski@pcb.com

Accelerometer 607A11



Flow Control and Wind Flow Pressure Mapping


EAST HANOVER, NJ (USA) – Sensor Products Inc. unveils its Tactilus Surface Air Flow Sensor, containing a one-dimensional array of 16 pressure sensing elements. The sensor’s capacitance-based design provides extreme sensitivity (down to a single drop of water!) for both positive and negative pressures. The thin construction allows significant flexing; mounting to curved surfaces, such as the leading edge of an airfoil, is easy. Multiple strips can be connected to the same interface, allowing hundreds of data points to be collected simultaneously. All Tactilus Air Flow systems are factory calibrated for high accuracy.


The TAF-1000 features a Tactilus pressure sensor mounted on a rigid rectangular plate. This product is ideal for pressure measurement applications involving a flat surface. Such high-sensitivity pressure data is valuable for many applications in aerodynamics, flow control, and fluid mechanics. The TAF-1500 features a Tactilus pressure sensor mounted on a rigid square plate. This configuration has been developed specially for pressure measurement in rheology and other fluid mechanics applications.


The TAF-2000 features a flexible Tactilus pressure sensor. This product is ideal for pressure measurement applications involving curved surfaces such as airfoils and pipes. The TAF-2000 finds many applications in aerodynamics, flow control, and fluid mechanics. Examples include wind tunnel testing and leak detection.


Gerard E. Mayers,

Sensor Products Inc.

188 Route 10, Suite 307, East Hanover, NJ 07936-2108, USA

Phone (1) 973-884-1755, Fax (1) 973.884.1699

E-mail: gmayers@sensorprod.com

Tactilus Surface Air Flow Sensor



Squeak & Rattle Measurement System from Larson Davis


Provo, UT - Ford Motor Company and Larson Davis recently announced the availability of the NOMAD Squeak & Rattle Measurement System through Larson Davis distribution channels. The NOMAD system was developed by Ford Motor Company for conducting objective NVH and Squeak & Rattle measurements on auto components and vehicles. The system hardware consists of a precision measurement microphone, connected to a laptop computer equipped with a high quality sound card. The S&R software couples subjective assessments with objective data for identifying root causes of NVH and Squeak & Rattle. The system is compact, highly portable, and easy to use.


John Carey,

Marketing Manager,

Larson Davis, Inc.

1681 West 820 North, Provo, UT 84601

Phone: (888) 258-3222

E-mail: jcarey@larsondavis.com

Squeak & Rattle Measurement System



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